xref: /openbmc/linux/drivers/gpu/drm/kmb/kmb_dsi.c (revision 73289afe)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright © 2019-2020 Intel Corporation
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/of.h>
9 #include <linux/of_graph.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
13 
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_bridge.h>
16 #include <drm/drm_bridge_connector.h>
17 #include <drm/drm_mipi_dsi.h>
18 #include <drm/drm_simple_kms_helper.h>
19 #include <drm/drm_print.h>
20 #include <drm/drm_probe_helper.h>
21 
22 #include "kmb_dsi.h"
23 #include "kmb_regs.h"
24 
25 static struct mipi_dsi_host *dsi_host;
26 static struct mipi_dsi_device *dsi_device;
27 static struct drm_bridge *adv_bridge;
28 
29 /* Default setting is 1080p, 4 lanes */
30 #define IMG_HEIGHT_LINES  1080
31 #define IMG_WIDTH_PX      1920
32 #define MIPI_TX_ACTIVE_LANES 4
33 
34 static struct mipi_tx_frame_section_cfg mipi_tx_frame0_sect_cfg = {
35 	.width_pixels = IMG_WIDTH_PX,
36 	.height_lines = IMG_HEIGHT_LINES,
37 	.data_type = DSI_LP_DT_PPS_RGB888_24B,
38 	.data_mode = MIPI_DATA_MODE1,
39 	.dma_packed = 0
40 };
41 
42 static struct mipi_tx_frame_cfg mipitx_frame0_cfg = {
43 	.sections[0] = &mipi_tx_frame0_sect_cfg,
44 	.sections[1] = NULL,
45 	.sections[2] = NULL,
46 	.sections[3] = NULL,
47 	.vsync_width = 5,
48 	.v_backporch = 36,
49 	.v_frontporch = 4,
50 	.hsync_width = 44,
51 	.h_backporch = 148,
52 	.h_frontporch = 88
53 };
54 
55 static const struct mipi_tx_dsi_cfg mipitx_dsi_cfg = {
56 	.hfp_blank_en = 0,
57 	.eotp_en = 0,
58 	.lpm_last_vfp_line = 0,
59 	.lpm_first_vsa_line = 0,
60 	.sync_pulse_eventn = DSI_VIDEO_MODE_NO_BURST_EVENT,
61 	.hfp_blanking = SEND_BLANK_PACKET,
62 	.hbp_blanking = SEND_BLANK_PACKET,
63 	.hsa_blanking = SEND_BLANK_PACKET,
64 	.v_blanking = SEND_BLANK_PACKET,
65 };
66 
67 static struct mipi_ctrl_cfg mipi_tx_init_cfg = {
68 	.active_lanes = MIPI_TX_ACTIVE_LANES,
69 	.lane_rate_mbps = MIPI_TX_LANE_DATA_RATE_MBPS,
70 	.ref_clk_khz = MIPI_TX_REF_CLK_KHZ,
71 	.cfg_clk_khz = MIPI_TX_CFG_CLK_KHZ,
72 	.tx_ctrl_cfg = {
73 			.frames[0] = &mipitx_frame0_cfg,
74 			.frames[1] = NULL,
75 			.frames[2] = NULL,
76 			.frames[3] = NULL,
77 			.tx_dsi_cfg = &mipitx_dsi_cfg,
78 			.line_sync_pkt_en = 0,
79 			.line_counter_active = 0,
80 			.frame_counter_active = 0,
81 			.tx_always_use_hact = 1,
82 			.tx_hact_wait_stop = 1,
83 			}
84 };
85 
86 struct  mipi_hs_freq_range_cfg {
87 	u16 default_bit_rate_mbps;
88 	u8 hsfreqrange_code;
89 };
90 
91 struct vco_params {
92 	u32 freq;
93 	u32 range;
94 	u32 divider;
95 };
96 
97 static const struct vco_params vco_table[] = {
98 	{52, 0x3f, 8},
99 	{80, 0x39, 8},
100 	{105, 0x2f, 4},
101 	{160, 0x29, 4},
102 	{210, 0x1f, 2},
103 	{320, 0x19, 2},
104 	{420, 0x0f, 1},
105 	{630, 0x09, 1},
106 	{1100, 0x03, 1},
107 	{0xffff, 0x01, 1},
108 };
109 
110 static const struct mipi_hs_freq_range_cfg
111 mipi_hs_freq_range[MIPI_DPHY_DEFAULT_BIT_RATES] = {
112 	{.default_bit_rate_mbps = 80, .hsfreqrange_code = 0x00},
113 	{.default_bit_rate_mbps = 90, .hsfreqrange_code = 0x10},
114 	{.default_bit_rate_mbps = 100, .hsfreqrange_code = 0x20},
115 	{.default_bit_rate_mbps = 110, .hsfreqrange_code = 0x30},
116 	{.default_bit_rate_mbps = 120, .hsfreqrange_code = 0x01},
117 	{.default_bit_rate_mbps = 130, .hsfreqrange_code = 0x11},
118 	{.default_bit_rate_mbps = 140, .hsfreqrange_code = 0x21},
119 	{.default_bit_rate_mbps = 150, .hsfreqrange_code = 0x31},
120 	{.default_bit_rate_mbps = 160, .hsfreqrange_code = 0x02},
121 	{.default_bit_rate_mbps = 170, .hsfreqrange_code = 0x12},
122 	{.default_bit_rate_mbps = 180, .hsfreqrange_code = 0x22},
123 	{.default_bit_rate_mbps = 190, .hsfreqrange_code = 0x32},
124 	{.default_bit_rate_mbps = 205, .hsfreqrange_code = 0x03},
125 	{.default_bit_rate_mbps = 220, .hsfreqrange_code = 0x13},
126 	{.default_bit_rate_mbps = 235, .hsfreqrange_code = 0x23},
127 	{.default_bit_rate_mbps = 250, .hsfreqrange_code = 0x33},
128 	{.default_bit_rate_mbps = 275, .hsfreqrange_code = 0x04},
129 	{.default_bit_rate_mbps = 300, .hsfreqrange_code = 0x14},
130 	{.default_bit_rate_mbps = 325, .hsfreqrange_code = 0x25},
131 	{.default_bit_rate_mbps = 350, .hsfreqrange_code = 0x35},
132 	{.default_bit_rate_mbps = 400, .hsfreqrange_code = 0x05},
133 	{.default_bit_rate_mbps = 450, .hsfreqrange_code = 0x16},
134 	{.default_bit_rate_mbps = 500, .hsfreqrange_code = 0x26},
135 	{.default_bit_rate_mbps = 550, .hsfreqrange_code = 0x37},
136 	{.default_bit_rate_mbps = 600, .hsfreqrange_code = 0x07},
137 	{.default_bit_rate_mbps = 650, .hsfreqrange_code = 0x18},
138 	{.default_bit_rate_mbps = 700, .hsfreqrange_code = 0x28},
139 	{.default_bit_rate_mbps = 750, .hsfreqrange_code = 0x39},
140 	{.default_bit_rate_mbps = 800, .hsfreqrange_code = 0x09},
141 	{.default_bit_rate_mbps = 850, .hsfreqrange_code = 0x19},
142 	{.default_bit_rate_mbps = 900, .hsfreqrange_code = 0x29},
143 	{.default_bit_rate_mbps = 1000, .hsfreqrange_code = 0x0A},
144 	{.default_bit_rate_mbps = 1050, .hsfreqrange_code = 0x1A},
145 	{.default_bit_rate_mbps = 1100, .hsfreqrange_code = 0x2A},
146 	{.default_bit_rate_mbps = 1150, .hsfreqrange_code = 0x3B},
147 	{.default_bit_rate_mbps = 1200, .hsfreqrange_code = 0x0B},
148 	{.default_bit_rate_mbps = 1250, .hsfreqrange_code = 0x1B},
149 	{.default_bit_rate_mbps = 1300, .hsfreqrange_code = 0x2B},
150 	{.default_bit_rate_mbps = 1350, .hsfreqrange_code = 0x3C},
151 	{.default_bit_rate_mbps = 1400, .hsfreqrange_code = 0x0C},
152 	{.default_bit_rate_mbps = 1450, .hsfreqrange_code = 0x1C},
153 	{.default_bit_rate_mbps = 1500, .hsfreqrange_code = 0x2C},
154 	{.default_bit_rate_mbps = 1550, .hsfreqrange_code = 0x3D},
155 	{.default_bit_rate_mbps = 1600, .hsfreqrange_code = 0x0D},
156 	{.default_bit_rate_mbps = 1650, .hsfreqrange_code = 0x1D},
157 	{.default_bit_rate_mbps = 1700, .hsfreqrange_code = 0x2E},
158 	{.default_bit_rate_mbps = 1750, .hsfreqrange_code = 0x3E},
159 	{.default_bit_rate_mbps = 1800, .hsfreqrange_code = 0x0E},
160 	{.default_bit_rate_mbps = 1850, .hsfreqrange_code = 0x1E},
161 	{.default_bit_rate_mbps = 1900, .hsfreqrange_code = 0x2F},
162 	{.default_bit_rate_mbps = 1950, .hsfreqrange_code = 0x3F},
163 	{.default_bit_rate_mbps = 2000, .hsfreqrange_code = 0x0F},
164 	{.default_bit_rate_mbps = 2050, .hsfreqrange_code = 0x40},
165 	{.default_bit_rate_mbps = 2100, .hsfreqrange_code = 0x41},
166 	{.default_bit_rate_mbps = 2150, .hsfreqrange_code = 0x42},
167 	{.default_bit_rate_mbps = 2200, .hsfreqrange_code = 0x43},
168 	{.default_bit_rate_mbps = 2250, .hsfreqrange_code = 0x44},
169 	{.default_bit_rate_mbps = 2300, .hsfreqrange_code = 0x45},
170 	{.default_bit_rate_mbps = 2350, .hsfreqrange_code = 0x46},
171 	{.default_bit_rate_mbps = 2400, .hsfreqrange_code = 0x47},
172 	{.default_bit_rate_mbps = 2450, .hsfreqrange_code = 0x48},
173 	{.default_bit_rate_mbps = 2500, .hsfreqrange_code = 0x49}
174 };
175 
kmb_dsi_clk_disable(struct kmb_dsi * kmb_dsi)176 static void kmb_dsi_clk_disable(struct kmb_dsi *kmb_dsi)
177 {
178 	clk_disable_unprepare(kmb_dsi->clk_mipi);
179 	clk_disable_unprepare(kmb_dsi->clk_mipi_ecfg);
180 	clk_disable_unprepare(kmb_dsi->clk_mipi_cfg);
181 }
182 
kmb_dsi_host_unregister(struct kmb_dsi * kmb_dsi)183 void kmb_dsi_host_unregister(struct kmb_dsi *kmb_dsi)
184 {
185 	kmb_dsi_clk_disable(kmb_dsi);
186 	mipi_dsi_host_unregister(kmb_dsi->host);
187 }
188 
189 /*
190  * This DSI can only be paired with bridges that do config through i2c
191  * which is ADV 7535 in the KMB EVM
192  */
kmb_dsi_host_transfer(struct mipi_dsi_host * host,const struct mipi_dsi_msg * msg)193 static ssize_t kmb_dsi_host_transfer(struct mipi_dsi_host *host,
194 				     const struct mipi_dsi_msg *msg)
195 {
196 	return 0;
197 }
198 
kmb_dsi_host_attach(struct mipi_dsi_host * host,struct mipi_dsi_device * dev)199 static int kmb_dsi_host_attach(struct mipi_dsi_host *host,
200 			       struct mipi_dsi_device *dev)
201 {
202 	return 0;
203 }
204 
kmb_dsi_host_detach(struct mipi_dsi_host * host,struct mipi_dsi_device * dev)205 static int kmb_dsi_host_detach(struct mipi_dsi_host *host,
206 			       struct mipi_dsi_device *dev)
207 {
208 	return 0;
209 }
210 
211 static const struct mipi_dsi_host_ops kmb_dsi_host_ops = {
212 	.attach = kmb_dsi_host_attach,
213 	.detach = kmb_dsi_host_detach,
214 	.transfer = kmb_dsi_host_transfer,
215 };
216 
kmb_dsi_host_bridge_init(struct device * dev)217 int kmb_dsi_host_bridge_init(struct device *dev)
218 {
219 	struct device_node *encoder_node, *dsi_out;
220 
221 	/* Create and register MIPI DSI host */
222 	if (!dsi_host) {
223 		dsi_host = kzalloc(sizeof(*dsi_host), GFP_KERNEL);
224 		if (!dsi_host)
225 			return -ENOMEM;
226 
227 		dsi_host->ops = &kmb_dsi_host_ops;
228 
229 		if (!dsi_device) {
230 			dsi_device = kzalloc(sizeof(*dsi_device), GFP_KERNEL);
231 			if (!dsi_device) {
232 				kfree(dsi_host);
233 				return -ENOMEM;
234 			}
235 		}
236 
237 		dsi_host->dev = dev;
238 		mipi_dsi_host_register(dsi_host);
239 	}
240 
241 	/* Find ADV7535 node and initialize it */
242 	dsi_out = of_graph_get_endpoint_by_regs(dev->of_node, 0, 1);
243 	if (!dsi_out) {
244 		DRM_ERROR("Failed to get dsi_out node info from DT\n");
245 		return -EINVAL;
246 	}
247 	encoder_node = of_graph_get_remote_port_parent(dsi_out);
248 	if (!encoder_node) {
249 		of_node_put(dsi_out);
250 		DRM_ERROR("Failed to get bridge info from DT\n");
251 		return -EINVAL;
252 	}
253 	/* Locate drm bridge from the hdmi encoder DT node */
254 	adv_bridge = of_drm_find_bridge(encoder_node);
255 	of_node_put(dsi_out);
256 	of_node_put(encoder_node);
257 	if (!adv_bridge) {
258 		DRM_DEBUG("Wait for external bridge driver DT\n");
259 		return -EPROBE_DEFER;
260 	}
261 
262 	return 0;
263 }
264 
mipi_get_datatype_params(u32 data_type,u32 data_mode,struct mipi_data_type_params * params)265 static u32 mipi_get_datatype_params(u32 data_type, u32 data_mode,
266 				    struct mipi_data_type_params *params)
267 {
268 	struct mipi_data_type_params data_type_param;
269 
270 	switch (data_type) {
271 	case DSI_LP_DT_PPS_YCBCR420_12B:
272 		data_type_param.size_constraint_pixels = 2;
273 		data_type_param.size_constraint_bytes = 3;
274 		switch (data_mode) {
275 			/* Case 0 not supported according to MDK */
276 		case 1:
277 		case 2:
278 		case 3:
279 			data_type_param.pixels_per_pclk = 2;
280 			data_type_param.bits_per_pclk = 24;
281 			break;
282 		default:
283 			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
284 			return -EINVAL;
285 		}
286 		break;
287 	case DSI_LP_DT_PPS_YCBCR422_16B:
288 		data_type_param.size_constraint_pixels = 2;
289 		data_type_param.size_constraint_bytes = 4;
290 		switch (data_mode) {
291 			/* Case 0 and 1 not supported according
292 			 * to MDK
293 			 */
294 		case 2:
295 			data_type_param.pixels_per_pclk = 1;
296 			data_type_param.bits_per_pclk = 16;
297 			break;
298 		case 3:
299 			data_type_param.pixels_per_pclk = 2;
300 			data_type_param.bits_per_pclk = 32;
301 			break;
302 		default:
303 			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
304 			return -EINVAL;
305 		}
306 		break;
307 	case DSI_LP_DT_LPPS_YCBCR422_20B:
308 	case DSI_LP_DT_PPS_YCBCR422_24B:
309 		data_type_param.size_constraint_pixels = 2;
310 		data_type_param.size_constraint_bytes = 6;
311 		switch (data_mode) {
312 			/* Case 0 not supported according to MDK */
313 		case 1:
314 		case 2:
315 		case 3:
316 			data_type_param.pixels_per_pclk = 1;
317 			data_type_param.bits_per_pclk = 24;
318 			break;
319 		default:
320 			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
321 			return -EINVAL;
322 		}
323 		break;
324 	case DSI_LP_DT_PPS_RGB565_16B:
325 		data_type_param.size_constraint_pixels = 1;
326 		data_type_param.size_constraint_bytes = 2;
327 		switch (data_mode) {
328 		case 0:
329 		case 1:
330 			data_type_param.pixels_per_pclk = 1;
331 			data_type_param.bits_per_pclk = 16;
332 			break;
333 		case 2:
334 		case 3:
335 			data_type_param.pixels_per_pclk = 2;
336 			data_type_param.bits_per_pclk = 32;
337 			break;
338 		default:
339 			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
340 			return -EINVAL;
341 		}
342 		break;
343 	case DSI_LP_DT_PPS_RGB666_18B:
344 		data_type_param.size_constraint_pixels = 4;
345 		data_type_param.size_constraint_bytes = 9;
346 		data_type_param.bits_per_pclk = 18;
347 		data_type_param.pixels_per_pclk = 1;
348 		break;
349 	case DSI_LP_DT_LPPS_RGB666_18B:
350 	case DSI_LP_DT_PPS_RGB888_24B:
351 		data_type_param.size_constraint_pixels = 1;
352 		data_type_param.size_constraint_bytes = 3;
353 		data_type_param.bits_per_pclk = 24;
354 		data_type_param.pixels_per_pclk = 1;
355 		break;
356 	case DSI_LP_DT_PPS_RGB101010_30B:
357 		data_type_param.size_constraint_pixels = 4;
358 		data_type_param.size_constraint_bytes = 15;
359 		data_type_param.bits_per_pclk = 30;
360 		data_type_param.pixels_per_pclk = 1;
361 		break;
362 	default:
363 		DRM_ERROR("DSI: Invalid data_type %d\n", data_type);
364 		return -EINVAL;
365 	}
366 
367 	*params = data_type_param;
368 	return 0;
369 }
370 
compute_wc(u32 width_px,u8 size_constr_p,u8 size_constr_b)371 static u32 compute_wc(u32 width_px, u8 size_constr_p, u8 size_constr_b)
372 {
373 	/* Calculate the word count for each long packet */
374 	return (((width_px / size_constr_p) * size_constr_b) & 0xffff);
375 }
376 
compute_unpacked_bytes(u32 wc,u8 bits_per_pclk)377 static u32 compute_unpacked_bytes(u32 wc, u8 bits_per_pclk)
378 {
379 	/* Number of PCLK cycles needed to transfer a line
380 	 * with each PCLK cycle, 4 Bytes are sent through the PPL module
381 	 */
382 	return ((wc * 8) / bits_per_pclk) * 4;
383 }
384 
mipi_tx_fg_section_cfg_regs(struct kmb_dsi * kmb_dsi,u8 frame_id,u8 section,u32 height_lines,u32 unpacked_bytes,struct mipi_tx_frame_sect_phcfg * ph_cfg)385 static u32 mipi_tx_fg_section_cfg_regs(struct kmb_dsi *kmb_dsi,
386 				       u8 frame_id, u8 section,
387 				       u32 height_lines, u32 unpacked_bytes,
388 				       struct mipi_tx_frame_sect_phcfg *ph_cfg)
389 {
390 	u32 cfg = 0;
391 	u32 ctrl_no = MIPI_CTRL6;
392 	u32 reg_adr;
393 
394 	/* Frame section packet header */
395 	/* Word count bits [15:0] */
396 	cfg = (ph_cfg->wc & MIPI_TX_SECT_WC_MASK) << 0;
397 
398 	/* Data type (bits [21:16]) */
399 	cfg |= ((ph_cfg->data_type & MIPI_TX_SECT_DT_MASK)
400 		<< MIPI_TX_SECT_DT_SHIFT);
401 
402 	/* Virtual channel (bits [23:22]) */
403 	cfg |= ((ph_cfg->vchannel & MIPI_TX_SECT_VC_MASK)
404 		<< MIPI_TX_SECT_VC_SHIFT);
405 
406 	/* Data mode (bits [24:25]) */
407 	cfg |= ((ph_cfg->data_mode & MIPI_TX_SECT_DM_MASK)
408 		<< MIPI_TX_SECT_DM_SHIFT);
409 	if (ph_cfg->dma_packed)
410 		cfg |= MIPI_TX_SECT_DMA_PACKED;
411 
412 	dev_dbg(kmb_dsi->dev,
413 		"ctrl=%d frame_id=%d section=%d cfg=%x packed=%d\n",
414 		  ctrl_no, frame_id, section, cfg, ph_cfg->dma_packed);
415 	kmb_write_mipi(kmb_dsi,
416 		       (MIPI_TXm_HS_FGn_SECTo_PH(ctrl_no, frame_id, section)),
417 		       cfg);
418 
419 	/* Unpacked bytes */
420 
421 	/* There are 4 frame generators and each fg has 4 sections
422 	 * There are 2 registers for unpacked bytes (# bytes each
423 	 * section occupies in memory)
424 	 * REG_UNPACKED_BYTES0: [15:0]-BYTES0, [31:16]-BYTES1
425 	 * REG_UNPACKED_BYTES1: [15:0]-BYTES2, [31:16]-BYTES3
426 	 */
427 	reg_adr =
428 	    MIPI_TXm_HS_FGn_SECT_UNPACKED_BYTES0(ctrl_no,
429 						 frame_id) + (section / 2) * 4;
430 	kmb_write_bits_mipi(kmb_dsi, reg_adr, (section % 2) * 16, 16,
431 			    unpacked_bytes);
432 	dev_dbg(kmb_dsi->dev,
433 		"unpacked_bytes = %d, wordcount = %d\n", unpacked_bytes,
434 		  ph_cfg->wc);
435 
436 	/* Line config */
437 	reg_adr = MIPI_TXm_HS_FGn_SECTo_LINE_CFG(ctrl_no, frame_id, section);
438 	kmb_write_mipi(kmb_dsi, reg_adr, height_lines);
439 	return 0;
440 }
441 
mipi_tx_fg_section_cfg(struct kmb_dsi * kmb_dsi,u8 frame_id,u8 section,struct mipi_tx_frame_section_cfg * frame_scfg,u32 * bits_per_pclk,u32 * wc)442 static u32 mipi_tx_fg_section_cfg(struct kmb_dsi *kmb_dsi,
443 				  u8 frame_id, u8 section,
444 				  struct mipi_tx_frame_section_cfg *frame_scfg,
445 				  u32 *bits_per_pclk, u32 *wc)
446 {
447 	u32 ret = 0;
448 	u32 unpacked_bytes;
449 	struct mipi_data_type_params data_type_parameters;
450 	struct mipi_tx_frame_sect_phcfg ph_cfg;
451 
452 	ret = mipi_get_datatype_params(frame_scfg->data_type,
453 				       frame_scfg->data_mode,
454 				       &data_type_parameters);
455 	if (ret)
456 		return ret;
457 
458 	/* Packet width has to be a multiple of the minimum packet width
459 	 * (in pixels) set for each data type
460 	 */
461 	if (frame_scfg->width_pixels %
462 	    data_type_parameters.size_constraint_pixels != 0)
463 		return -EINVAL;
464 
465 	*wc = compute_wc(frame_scfg->width_pixels,
466 			 data_type_parameters.size_constraint_pixels,
467 			 data_type_parameters.size_constraint_bytes);
468 	unpacked_bytes = compute_unpacked_bytes(*wc,
469 						data_type_parameters.bits_per_pclk);
470 	ph_cfg.wc = *wc;
471 	ph_cfg.data_mode = frame_scfg->data_mode;
472 	ph_cfg.data_type = frame_scfg->data_type;
473 	ph_cfg.dma_packed = frame_scfg->dma_packed;
474 	ph_cfg.vchannel = frame_id;
475 
476 	mipi_tx_fg_section_cfg_regs(kmb_dsi, frame_id, section,
477 				    frame_scfg->height_lines,
478 				    unpacked_bytes, &ph_cfg);
479 
480 	/* Caller needs bits_per_clk for additional caluclations */
481 	*bits_per_pclk = data_type_parameters.bits_per_pclk;
482 
483 	return 0;
484 }
485 
486 #define CLK_DIFF_LOW 50
487 #define CLK_DIFF_HI 60
488 #define SYSCLK_500  500
489 
mipi_tx_fg_cfg_regs(struct kmb_dsi * kmb_dsi,u8 frame_gen,struct mipi_tx_frame_timing_cfg * fg_cfg)490 static void mipi_tx_fg_cfg_regs(struct kmb_dsi *kmb_dsi, u8 frame_gen,
491 				struct mipi_tx_frame_timing_cfg *fg_cfg)
492 {
493 	u32 sysclk;
494 	u32 ppl_llp_ratio;
495 	u32 ctrl_no = MIPI_CTRL6, reg_adr, val, offset;
496 
497 	/* 500 Mhz system clock minus 50 to account for the difference in
498 	 * MIPI clock speed in RTL tests
499 	 */
500 	if (kmb_dsi->sys_clk_mhz == SYSCLK_500) {
501 		sysclk = kmb_dsi->sys_clk_mhz - CLK_DIFF_LOW;
502 	} else {
503 		/* 700 Mhz clk*/
504 		sysclk = kmb_dsi->sys_clk_mhz - CLK_DIFF_HI;
505 	}
506 
507 	/* PPL-Pixel Packing Layer, LLP-Low Level Protocol
508 	 * Frame genartor timing parameters are clocked on the system clock,
509 	 * whereas as the equivalent parameters in the LLP blocks are clocked
510 	 * on LLP Tx clock from the D-PHY - BYTE clock
511 	 */
512 
513 	/* Multiply by 1000 to maintain precision */
514 	ppl_llp_ratio = ((fg_cfg->bpp / 8) * sysclk * 1000) /
515 	    ((fg_cfg->lane_rate_mbps / 8) * fg_cfg->active_lanes);
516 
517 	dev_dbg(kmb_dsi->dev, "ppl_llp_ratio=%d\n", ppl_llp_ratio);
518 	dev_dbg(kmb_dsi->dev, "bpp=%d sysclk=%d lane-rate=%d active-lanes=%d\n",
519 		fg_cfg->bpp, sysclk, fg_cfg->lane_rate_mbps,
520 		 fg_cfg->active_lanes);
521 
522 	/* Frame generator number of lines */
523 	reg_adr = MIPI_TXm_HS_FGn_NUM_LINES(ctrl_no, frame_gen);
524 	kmb_write_mipi(kmb_dsi, reg_adr, fg_cfg->v_active);
525 
526 	/* vsync width
527 	 * There are 2 registers for vsync width (VSA in lines for
528 	 * channels 0-3)
529 	 * REG_VSYNC_WIDTH0: [15:0]-VSA for channel0, [31:16]-VSA for channel1
530 	 * REG_VSYNC_WIDTH1: [15:0]-VSA for channel2, [31:16]-VSA for channel3
531 	 */
532 	offset = (frame_gen % 2) * 16;
533 	reg_adr = MIPI_TXm_HS_VSYNC_WIDTHn(ctrl_no, frame_gen / 2);
534 	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->vsync_width);
535 
536 	/* vertical backporch (vbp) */
537 	reg_adr = MIPI_TXm_HS_V_BACKPORCHESn(ctrl_no, frame_gen / 2);
538 	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->v_backporch);
539 
540 	/* vertical frontporch (vfp) */
541 	reg_adr = MIPI_TXm_HS_V_FRONTPORCHESn(ctrl_no, frame_gen / 2);
542 	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->v_frontporch);
543 
544 	/* vertical active (vactive) */
545 	reg_adr = MIPI_TXm_HS_V_ACTIVEn(ctrl_no, frame_gen / 2);
546 	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->v_active);
547 
548 	/* hsync width */
549 	reg_adr = MIPI_TXm_HS_HSYNC_WIDTHn(ctrl_no, frame_gen);
550 	kmb_write_mipi(kmb_dsi, reg_adr,
551 		       (fg_cfg->hsync_width * ppl_llp_ratio) / 1000);
552 
553 	/* horizontal backporch (hbp) */
554 	reg_adr = MIPI_TXm_HS_H_BACKPORCHn(ctrl_no, frame_gen);
555 	kmb_write_mipi(kmb_dsi, reg_adr,
556 		       (fg_cfg->h_backporch * ppl_llp_ratio) / 1000);
557 
558 	/* horizontal frontporch (hfp) */
559 	reg_adr = MIPI_TXm_HS_H_FRONTPORCHn(ctrl_no, frame_gen);
560 	kmb_write_mipi(kmb_dsi, reg_adr,
561 		       (fg_cfg->h_frontporch * ppl_llp_ratio) / 1000);
562 
563 	/* horizontal active (ha) */
564 	reg_adr = MIPI_TXm_HS_H_ACTIVEn(ctrl_no, frame_gen);
565 
566 	/* convert h_active which is wc in bytes to cycles */
567 	val = (fg_cfg->h_active * sysclk * 1000) /
568 	    ((fg_cfg->lane_rate_mbps / 8) * fg_cfg->active_lanes);
569 	val /= 1000;
570 	kmb_write_mipi(kmb_dsi, reg_adr, val);
571 
572 	/* llp hsync width */
573 	reg_adr = MIPI_TXm_HS_LLP_HSYNC_WIDTHn(ctrl_no, frame_gen);
574 	kmb_write_mipi(kmb_dsi, reg_adr, fg_cfg->hsync_width * (fg_cfg->bpp / 8));
575 
576 	/* llp h backporch */
577 	reg_adr = MIPI_TXm_HS_LLP_H_BACKPORCHn(ctrl_no, frame_gen);
578 	kmb_write_mipi(kmb_dsi, reg_adr, fg_cfg->h_backporch * (fg_cfg->bpp / 8));
579 
580 	/* llp h frontporch */
581 	reg_adr = MIPI_TXm_HS_LLP_H_FRONTPORCHn(ctrl_no, frame_gen);
582 	kmb_write_mipi(kmb_dsi, reg_adr,
583 		       fg_cfg->h_frontporch * (fg_cfg->bpp / 8));
584 }
585 
mipi_tx_fg_cfg(struct kmb_dsi * kmb_dsi,u8 frame_gen,u8 active_lanes,u32 bpp,u32 wc,u32 lane_rate_mbps,struct mipi_tx_frame_cfg * fg_cfg)586 static void mipi_tx_fg_cfg(struct kmb_dsi *kmb_dsi, u8 frame_gen,
587 			   u8 active_lanes, u32 bpp, u32 wc,
588 			   u32 lane_rate_mbps, struct mipi_tx_frame_cfg *fg_cfg)
589 {
590 	u32 i, fg_num_lines = 0;
591 	struct mipi_tx_frame_timing_cfg fg_t_cfg;
592 
593 	/* Calculate the total frame generator number of
594 	 * lines based on it's active sections
595 	 */
596 	for (i = 0; i < MIPI_TX_FRAME_GEN_SECTIONS; i++) {
597 		if (fg_cfg->sections[i])
598 			fg_num_lines += fg_cfg->sections[i]->height_lines;
599 	}
600 
601 	fg_t_cfg.bpp = bpp;
602 	fg_t_cfg.lane_rate_mbps = lane_rate_mbps;
603 	fg_t_cfg.hsync_width = fg_cfg->hsync_width;
604 	fg_t_cfg.h_backporch = fg_cfg->h_backporch;
605 	fg_t_cfg.h_frontporch = fg_cfg->h_frontporch;
606 	fg_t_cfg.h_active = wc;
607 	fg_t_cfg.vsync_width = fg_cfg->vsync_width;
608 	fg_t_cfg.v_backporch = fg_cfg->v_backporch;
609 	fg_t_cfg.v_frontporch = fg_cfg->v_frontporch;
610 	fg_t_cfg.v_active = fg_num_lines;
611 	fg_t_cfg.active_lanes = active_lanes;
612 
613 	/* Apply frame generator timing setting */
614 	mipi_tx_fg_cfg_regs(kmb_dsi, frame_gen, &fg_t_cfg);
615 }
616 
mipi_tx_multichannel_fifo_cfg(struct kmb_dsi * kmb_dsi,u8 active_lanes,u8 vchannel_id)617 static void mipi_tx_multichannel_fifo_cfg(struct kmb_dsi *kmb_dsi,
618 					  u8 active_lanes, u8 vchannel_id)
619 {
620 	u32 fifo_size, fifo_rthreshold;
621 	u32 ctrl_no = MIPI_CTRL6;
622 
623 	/* Clear all mc fifo channel sizes and thresholds */
624 	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_CTRL_EN, 0);
625 	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_CHAN_ALLOC0, 0);
626 	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_CHAN_ALLOC1, 0);
627 	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_RTHRESHOLD0, 0);
628 	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_RTHRESHOLD1, 0);
629 
630 	fifo_size = ((active_lanes > MIPI_D_LANES_PER_DPHY) ?
631 		     MIPI_CTRL_4LANE_MAX_MC_FIFO_LOC :
632 		     MIPI_CTRL_2LANE_MAX_MC_FIFO_LOC) - 1;
633 
634 	/* MC fifo size for virtual channels 0-3
635 	 * REG_MC_FIFO_CHAN_ALLOC0: [8:0]-channel0, [24:16]-channel1
636 	 * REG_MC_FIFO_CHAN_ALLOC1: [8:0]-2, [24:16]-channel3
637 	 */
638 	SET_MC_FIFO_CHAN_ALLOC(kmb_dsi, ctrl_no, vchannel_id, fifo_size);
639 
640 	/* Set threshold to half the fifo size, actual size=size*16 */
641 	fifo_rthreshold = ((fifo_size) * 8) & BIT_MASK_16;
642 	SET_MC_FIFO_RTHRESHOLD(kmb_dsi, ctrl_no, vchannel_id, fifo_rthreshold);
643 
644 	/* Enable the MC FIFO channel corresponding to the Virtual Channel */
645 	kmb_set_bit_mipi(kmb_dsi, MIPI_TXm_HS_MC_FIFO_CTRL_EN(ctrl_no),
646 			 vchannel_id);
647 }
648 
mipi_tx_ctrl_cfg(struct kmb_dsi * kmb_dsi,u8 fg_id,struct mipi_ctrl_cfg * ctrl_cfg)649 static void mipi_tx_ctrl_cfg(struct kmb_dsi *kmb_dsi, u8 fg_id,
650 			     struct mipi_ctrl_cfg *ctrl_cfg)
651 {
652 	u32 sync_cfg = 0, ctrl = 0, fg_en;
653 	u32 ctrl_no = MIPI_CTRL6;
654 
655 	/* MIPI_TX_HS_SYNC_CFG */
656 	if (ctrl_cfg->tx_ctrl_cfg.line_sync_pkt_en)
657 		sync_cfg |= LINE_SYNC_PKT_ENABLE;
658 	if (ctrl_cfg->tx_ctrl_cfg.frame_counter_active)
659 		sync_cfg |= FRAME_COUNTER_ACTIVE;
660 	if (ctrl_cfg->tx_ctrl_cfg.line_counter_active)
661 		sync_cfg |= LINE_COUNTER_ACTIVE;
662 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->v_blanking)
663 		sync_cfg |= DSI_V_BLANKING;
664 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hsa_blanking)
665 		sync_cfg |= DSI_HSA_BLANKING;
666 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hbp_blanking)
667 		sync_cfg |= DSI_HBP_BLANKING;
668 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hfp_blanking)
669 		sync_cfg |= DSI_HFP_BLANKING;
670 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->sync_pulse_eventn)
671 		sync_cfg |= DSI_SYNC_PULSE_EVENTN;
672 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->lpm_first_vsa_line)
673 		sync_cfg |= DSI_LPM_FIRST_VSA_LINE;
674 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->lpm_last_vfp_line)
675 		sync_cfg |= DSI_LPM_LAST_VFP_LINE;
676 
677 	/* Enable frame generator */
678 	fg_en = 1 << fg_id;
679 	sync_cfg |= FRAME_GEN_EN(fg_en);
680 
681 	if (ctrl_cfg->tx_ctrl_cfg.tx_always_use_hact)
682 		sync_cfg |= ALWAYS_USE_HACT(fg_en);
683 	if (ctrl_cfg->tx_ctrl_cfg.tx_hact_wait_stop)
684 		sync_cfg |= HACT_WAIT_STOP(fg_en);
685 
686 	dev_dbg(kmb_dsi->dev, "sync_cfg=%d fg_en=%d\n", sync_cfg, fg_en);
687 
688 	/* MIPI_TX_HS_CTRL */
689 
690 	/* type:DSI, source:LCD */
691 	ctrl = HS_CTRL_EN | TX_SOURCE;
692 	ctrl |= LCD_VC(fg_id);
693 	ctrl |= ACTIVE_LANES(ctrl_cfg->active_lanes - 1);
694 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->eotp_en)
695 		ctrl |= DSI_EOTP_EN;
696 	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hfp_blank_en)
697 		ctrl |= DSI_CMD_HFP_EN;
698 
699 	/*67 ns stop time */
700 	ctrl |= HSEXIT_CNT(0x43);
701 
702 	kmb_write_mipi(kmb_dsi, MIPI_TXm_HS_SYNC_CFG(ctrl_no), sync_cfg);
703 	kmb_write_mipi(kmb_dsi, MIPI_TXm_HS_CTRL(ctrl_no), ctrl);
704 }
705 
mipi_tx_init_cntrl(struct kmb_dsi * kmb_dsi,struct mipi_ctrl_cfg * ctrl_cfg)706 static u32 mipi_tx_init_cntrl(struct kmb_dsi *kmb_dsi,
707 			      struct mipi_ctrl_cfg *ctrl_cfg)
708 {
709 	u32 ret = 0;
710 	u8 active_vchannels = 0;
711 	u8 frame_id, sect;
712 	u32 bits_per_pclk = 0;
713 	u32 word_count = 0;
714 	struct mipi_tx_frame_cfg *frame;
715 
716 	/* This is the order to initialize MIPI TX:
717 	 * 1. set frame section parameters
718 	 * 2. set frame specific parameters
719 	 * 3. connect lcd to mipi
720 	 * 4. multi channel fifo cfg
721 	 * 5. set mipitxcctrlcfg
722 	 */
723 
724 	for (frame_id = 0; frame_id < 4; frame_id++) {
725 		frame = ctrl_cfg->tx_ctrl_cfg.frames[frame_id];
726 
727 		/* Find valid frame, assume only one valid frame */
728 		if (!frame)
729 			continue;
730 
731 		/* Frame Section configuration */
732 		/* TODO - assume there is only one valid section in a frame,
733 		 * so bits_per_pclk and word_count are only set once
734 		 */
735 		for (sect = 0; sect < MIPI_CTRL_VIRTUAL_CHANNELS; sect++) {
736 			if (!frame->sections[sect])
737 				continue;
738 
739 			ret = mipi_tx_fg_section_cfg(kmb_dsi, frame_id, sect,
740 						     frame->sections[sect],
741 						     &bits_per_pclk,
742 						     &word_count);
743 			if (ret)
744 				return ret;
745 		}
746 
747 		/* Set frame specific parameters */
748 		mipi_tx_fg_cfg(kmb_dsi, frame_id, ctrl_cfg->active_lanes,
749 			       bits_per_pclk, word_count,
750 			       ctrl_cfg->lane_rate_mbps, frame);
751 
752 		active_vchannels++;
753 
754 		/* Stop iterating as only one virtual channel
755 		 * shall be used for LCD connection
756 		 */
757 		break;
758 	}
759 
760 	if (active_vchannels == 0)
761 		return -EINVAL;
762 	/* Multi-Channel FIFO Configuration */
763 	mipi_tx_multichannel_fifo_cfg(kmb_dsi, ctrl_cfg->active_lanes, frame_id);
764 
765 	/* Frame Generator Enable */
766 	mipi_tx_ctrl_cfg(kmb_dsi, frame_id, ctrl_cfg);
767 
768 	return ret;
769 }
770 
test_mode_send(struct kmb_dsi * kmb_dsi,u32 dphy_no,u32 test_code,u32 test_data)771 static void test_mode_send(struct kmb_dsi *kmb_dsi, u32 dphy_no,
772 			   u32 test_code, u32 test_data)
773 {
774 	/* Steps to send test code:
775 	 * - set testclk HIGH
776 	 * - set testdin with test code
777 	 * - set testen HIGH
778 	 * - set testclk LOW
779 	 * - set testen LOW
780 	 */
781 
782 	/* Set testclk high */
783 	SET_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);
784 
785 	/* Set testdin */
786 	SET_TEST_DIN0_3(kmb_dsi, dphy_no, test_code);
787 
788 	/* Set testen high */
789 	SET_DPHY_TEST_CTRL1_EN(kmb_dsi, dphy_no);
790 
791 	/* Set testclk low */
792 	CLR_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);
793 
794 	/* Set testen low */
795 	CLR_DPHY_TEST_CTRL1_EN(kmb_dsi, dphy_no);
796 
797 	if (test_code) {
798 		/*  Steps to send test data:
799 		 * - set testen LOW
800 		 * - set testclk LOW
801 		 * - set testdin with data
802 		 * - set testclk HIGH
803 		 */
804 
805 		/* Set testen low */
806 		CLR_DPHY_TEST_CTRL1_EN(kmb_dsi, dphy_no);
807 
808 		/* Set testclk low */
809 		CLR_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);
810 
811 		/* Set data in testdin */
812 		kmb_write_mipi(kmb_dsi,
813 			       DPHY_TEST_DIN0_3 + ((dphy_no / 0x4) * 0x4),
814 			       test_data << ((dphy_no % 4) * 8));
815 
816 		/* Set testclk high */
817 		SET_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);
818 	}
819 }
820 
821 static inline void
set_test_mode_src_osc_freq_target_low_bits(struct kmb_dsi * kmb_dsi,u32 dphy_no,u32 freq)822 	set_test_mode_src_osc_freq_target_low_bits(struct kmb_dsi *kmb_dsi,
823 						   u32 dphy_no,
824 						   u32 freq)
825 {
826 	/* Typical rise/fall time=166, refer Table 1207 databook,
827 	 * sr_osc_freq_target[7:0]
828 	 */
829 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES,
830 		       (freq & 0x7f));
831 }
832 
833 static inline void
set_test_mode_src_osc_freq_target_hi_bits(struct kmb_dsi * kmb_dsi,u32 dphy_no,u32 freq)834 	set_test_mode_src_osc_freq_target_hi_bits(struct kmb_dsi *kmb_dsi,
835 						  u32 dphy_no,
836 						  u32 freq)
837 {
838 	u32 data;
839 
840 	/* Flag this as high nibble */
841 	data = ((freq >> 6) & 0x1f) | (1 << 7);
842 
843 	/* Typical rise/fall time=166, refer Table 1207 databook,
844 	 * sr_osc_freq_target[11:7]
845 	 */
846 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES, data);
847 }
848 
mipi_tx_get_vco_params(struct vco_params * vco)849 static void mipi_tx_get_vco_params(struct vco_params *vco)
850 {
851 	int i;
852 
853 	for (i = 0; i < ARRAY_SIZE(vco_table); i++) {
854 		if (vco->freq < vco_table[i].freq) {
855 			*vco = vco_table[i];
856 			return;
857 		}
858 	}
859 
860 	WARN_ONCE(1, "Invalid vco freq = %u for PLL setup\n", vco->freq);
861 }
862 
mipi_tx_pll_setup(struct kmb_dsi * kmb_dsi,u32 dphy_no,u32 ref_clk_mhz,u32 target_freq_mhz)863 static void mipi_tx_pll_setup(struct kmb_dsi *kmb_dsi, u32 dphy_no,
864 			      u32 ref_clk_mhz, u32 target_freq_mhz)
865 {
866 	u32 best_n = 0, best_m = 0;
867 	u32 n = 0, m = 0, div = 0, delta, freq = 0, t_freq;
868 	u32 best_freq_delta = 3000;
869 
870 	/* pll_ref_clk: - valid range: 2~64 MHz; Typically 24 MHz
871 	 * Fvco: - valid range: 320~1250 MHz (Gen3 D-PHY)
872 	 * Fout: - valid range: 40~1250 MHz (Gen3 D-PHY)
873 	 * n: - valid range [0 15]
874 	 * N: - N = n + 1
875 	 *      -valid range: [1 16]
876 	 *      -conditions: - (pll_ref_clk / N) >= 2 MHz
877 	 *             -(pll_ref_clk / N) <= 8 MHz
878 	 * m: valid range [62 623]
879 	 * M: - M = m + 2
880 	 *      -valid range [64 625]
881 	 *      -Fvco = (M/N) * pll_ref_clk
882 	 */
883 	struct vco_params vco_p = {
884 		.range = 0,
885 		.divider = 1,
886 	};
887 
888 	vco_p.freq = target_freq_mhz;
889 	mipi_tx_get_vco_params(&vco_p);
890 
891 	/* Search pll n parameter */
892 	for (n = PLL_N_MIN; n <= PLL_N_MAX; n++) {
893 		/* Calculate the pll input frequency division ratio
894 		 * multiply by 1000 for precision -
895 		 * no floating point, add n for rounding
896 		 */
897 		div = ((ref_clk_mhz * 1000) + n) / (n + 1);
898 
899 		/* Found a valid n parameter */
900 		if ((div < 2000 || div > 8000))
901 			continue;
902 
903 		/* Search pll m parameter */
904 		for (m = PLL_M_MIN; m <= PLL_M_MAX; m++) {
905 			/* Calculate the Fvco(DPHY PLL output frequency)
906 			 * using the current n,m params
907 			 */
908 			freq = div * (m + 2);
909 			freq /= 1000;
910 
911 			/* Trim the potential pll freq to max supported */
912 			if (freq > PLL_FVCO_MAX)
913 				continue;
914 
915 			delta = abs(freq - target_freq_mhz);
916 
917 			/* Select the best (closest to target pll freq)
918 			 * n,m parameters so far
919 			 */
920 			if (delta < best_freq_delta) {
921 				best_n = n;
922 				best_m = m;
923 				best_freq_delta = delta;
924 			}
925 		}
926 	}
927 
928 	/* Program vco_cntrl parameter
929 	 * PLL_VCO_Control[5:0] = pll_vco_cntrl_ovr,
930 	 * PLL_VCO_Control[6]   = pll_vco_cntrl_ovr_en
931 	 */
932 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_VCO_CTRL, (vco_p.range
933 								| (1 << 6)));
934 
935 	/* Program m, n pll parameters */
936 	dev_dbg(kmb_dsi->dev, "m = %d n = %d\n", best_m, best_n);
937 
938 	/* PLL_Input_Divider_Ratio[3:0] = pll_n_ovr */
939 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_INPUT_DIVIDER,
940 		       (best_n & 0x0f));
941 
942 	/* m - low nibble PLL_Loop_Divider_Ratio[4:0]
943 	 * pll_m_ovr[4:0]
944 	 */
945 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_FEEDBACK_DIVIDER,
946 		       (best_m & 0x1f));
947 
948 	/* m - high nibble PLL_Loop_Divider_Ratio[4:0]
949 	 * pll_m_ovr[9:5]
950 	 */
951 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_FEEDBACK_DIVIDER,
952 		       ((best_m >> 5) & 0x1f) | PLL_FEEDBACK_DIVIDER_HIGH);
953 
954 	/* Enable overwrite of n,m parameters :pll_n_ovr_en, pll_m_ovr_en */
955 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_OUTPUT_CLK_SEL,
956 		       (PLL_N_OVR_EN | PLL_M_OVR_EN));
957 
958 	/* Program Charge-Pump parameters */
959 
960 	/* pll_prop_cntrl-fixed values for prop_cntrl from DPHY doc */
961 	t_freq = target_freq_mhz * vco_p.divider;
962 	test_mode_send(kmb_dsi, dphy_no,
963 		       TEST_CODE_PLL_PROPORTIONAL_CHARGE_PUMP_CTRL,
964 		       ((t_freq > 1150) ? 0x0C : 0x0B));
965 
966 	/* pll_int_cntrl-fixed value for int_cntrl from DPHY doc */
967 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_INTEGRAL_CHARGE_PUMP_CTRL,
968 		       0x00);
969 
970 	/* pll_gmp_cntrl-fixed value for gmp_cntrl from DPHY doci */
971 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_GMP_CTRL, 0x10);
972 
973 	/* pll_cpbias_cntrl-fixed value for cpbias_cntrl from DPHY doc */
974 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_CHARGE_PUMP_BIAS, 0x10);
975 
976 	/* pll_th1 -Lock Detector Phase error threshold,
977 	 * document gives fixed value
978 	 */
979 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_PHASE_ERR_CTRL, 0x02);
980 
981 	/* PLL Lock Configuration */
982 
983 	/* pll_th2 - Lock Filter length, document gives fixed value */
984 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_LOCK_FILTER, 0x60);
985 
986 	/* pll_th3- PLL Unlocking filter, document gives fixed value */
987 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_UNLOCK_FILTER, 0x03);
988 
989 	/* pll_lock_sel-PLL Lock Detector Selection,
990 	 * document gives fixed value
991 	 */
992 	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_LOCK_DETECTOR, 0x02);
993 }
994 
set_slewrate_gt_1500(struct kmb_dsi * kmb_dsi,u32 dphy_no)995 static void set_slewrate_gt_1500(struct kmb_dsi *kmb_dsi, u32 dphy_no)
996 {
997 	u32 test_code = 0, test_data = 0;
998 	/* Bypass slew rate calibration algorithm
999 	 * bits[1:0} srcal_en_ovr_en, srcal_en_ovr
1000 	 */
1001 	test_code = TEST_CODE_SLEW_RATE_OVERRIDE_CTRL;
1002 	test_data = 0x02;
1003 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1004 
1005 	/* Disable slew rate calibration */
1006 	test_code = TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL;
1007 	test_data = 0x00;
1008 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1009 }
1010 
set_slewrate_gt_1000(struct kmb_dsi * kmb_dsi,u32 dphy_no)1011 static void set_slewrate_gt_1000(struct kmb_dsi *kmb_dsi, u32 dphy_no)
1012 {
1013 	u32 test_code = 0, test_data = 0;
1014 
1015 	/* BitRate: > 1 Gbps && <= 1.5 Gbps: - slew rate control ON
1016 	 * typical rise/fall times: 166 ps
1017 	 */
1018 
1019 	/* Do not bypass slew rate calibration algorithm
1020 	 * bits[1:0}=srcal_en_ovr_en, srcal_en_ovr, bit[6]=sr_range
1021 	 */
1022 	test_code = TEST_CODE_SLEW_RATE_OVERRIDE_CTRL;
1023 	test_data = (0x03 | (1 << 6));
1024 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1025 
1026 	/* Enable slew rate calibration */
1027 	test_code = TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL;
1028 	test_data = 0x01;
1029 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1030 
1031 	/* Set sr_osc_freq_target[6:0] low nibble
1032 	 * typical rise/fall time=166, refer Table 1207 databook
1033 	 */
1034 	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
1035 	test_data = (0x72f & 0x7f);
1036 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1037 
1038 	/* Set sr_osc_freq_target[11:7] high nibble
1039 	 * Typical rise/fall time=166, refer Table 1207 databook
1040 	 */
1041 	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
1042 	test_data = ((0x72f >> 6) & 0x1f) | (1 << 7);
1043 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1044 }
1045 
set_slewrate_lt_1000(struct kmb_dsi * kmb_dsi,u32 dphy_no)1046 static void set_slewrate_lt_1000(struct kmb_dsi *kmb_dsi, u32 dphy_no)
1047 {
1048 	u32 test_code = 0, test_data = 0;
1049 
1050 	/* lane_rate_mbps <= 1000 Mbps
1051 	 * BitRate:  <= 1 Gbps:
1052 	 * - slew rate control ON
1053 	 * - typical rise/fall times: 225 ps
1054 	 */
1055 
1056 	/* Do not bypass slew rate calibration algorithm */
1057 	test_code = TEST_CODE_SLEW_RATE_OVERRIDE_CTRL;
1058 	test_data = (0x03 | (1 << 6));
1059 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1060 
1061 	/* Enable slew rate calibration */
1062 	test_code = TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL;
1063 	test_data = 0x01;
1064 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1065 
1066 	/* Typical rise/fall time=255, refer Table 1207 databook */
1067 	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
1068 	test_data = (0x523 & 0x7f);
1069 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1070 
1071 	/* Set sr_osc_freq_target[11:7] high nibble */
1072 	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
1073 	test_data = ((0x523 >> 6) & 0x1f) | (1 << 7);
1074 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1075 }
1076 
setup_pll(struct kmb_dsi * kmb_dsi,u32 dphy_no,struct mipi_ctrl_cfg * cfg)1077 static void setup_pll(struct kmb_dsi *kmb_dsi, u32 dphy_no,
1078 		      struct mipi_ctrl_cfg *cfg)
1079 {
1080 	u32 test_code = 0, test_data = 0;
1081 
1082 	/* Set PLL regulator in bypass */
1083 	test_code = TEST_CODE_PLL_ANALOG_PROG;
1084 	test_data = 0x01;
1085 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1086 
1087 	/* PLL Parameters Setup */
1088 	mipi_tx_pll_setup(kmb_dsi, dphy_no, cfg->ref_clk_khz / 1000,
1089 			  cfg->lane_rate_mbps / 2);
1090 
1091 	/* Set clksel */
1092 	kmb_write_bits_mipi(kmb_dsi, DPHY_INIT_CTRL1, PLL_CLKSEL_0, 2, 0x01);
1093 
1094 	/* Set pll_shadow_control */
1095 	kmb_set_bit_mipi(kmb_dsi, DPHY_INIT_CTRL1, PLL_SHADOW_CTRL);
1096 }
1097 
set_lane_data_rate(struct kmb_dsi * kmb_dsi,u32 dphy_no,struct mipi_ctrl_cfg * cfg)1098 static void set_lane_data_rate(struct kmb_dsi *kmb_dsi, u32 dphy_no,
1099 			       struct mipi_ctrl_cfg *cfg)
1100 {
1101 	u32 i, test_code = 0, test_data = 0;
1102 
1103 	for (i = 0; i < MIPI_DPHY_DEFAULT_BIT_RATES; i++) {
1104 		if (mipi_hs_freq_range[i].default_bit_rate_mbps <
1105 		    cfg->lane_rate_mbps)
1106 			continue;
1107 
1108 		/* Send the test code and data */
1109 		/* bit[6:0] = hsfreqrange_ovr bit[7] = hsfreqrange_ovr_en */
1110 		test_code = TEST_CODE_HS_FREQ_RANGE_CFG;
1111 		test_data = (mipi_hs_freq_range[i].hsfreqrange_code & 0x7f) |
1112 		    (1 << 7);
1113 		test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1114 		break;
1115 	}
1116 }
1117 
dphy_init_sequence(struct kmb_dsi * kmb_dsi,struct mipi_ctrl_cfg * cfg,u32 dphy_no,int active_lanes,enum dphy_mode mode)1118 static void dphy_init_sequence(struct kmb_dsi *kmb_dsi,
1119 			       struct mipi_ctrl_cfg *cfg, u32 dphy_no,
1120 			       int active_lanes, enum dphy_mode mode)
1121 {
1122 	u32 test_code = 0, test_data = 0, val;
1123 
1124 	/* Set D-PHY in shutdown mode */
1125 	/* Assert RSTZ signal */
1126 	CLR_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, RESETZ);
1127 
1128 	/* Assert SHUTDOWNZ signal */
1129 	CLR_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, SHUTDOWNZ);
1130 	val = kmb_read_mipi(kmb_dsi, DPHY_INIT_CTRL0);
1131 
1132 	/* Init D-PHY_n
1133 	 * Pulse testclear signal to make sure the d-phy configuration
1134 	 * starts from a clean base
1135 	 */
1136 	CLR_DPHY_TEST_CTRL0(kmb_dsi, dphy_no);
1137 	ndelay(15);
1138 	SET_DPHY_TEST_CTRL0(kmb_dsi, dphy_no);
1139 	ndelay(15);
1140 	CLR_DPHY_TEST_CTRL0(kmb_dsi, dphy_no);
1141 	ndelay(15);
1142 
1143 	/* Set mastermacro bit - Master or slave mode */
1144 	test_code = TEST_CODE_MULTIPLE_PHY_CTRL;
1145 
1146 	/* DPHY has its own clock lane enabled (master) */
1147 	if (mode == MIPI_DPHY_MASTER)
1148 		test_data = 0x01;
1149 	else
1150 		test_data = 0x00;
1151 
1152 	/* Send the test code and data */
1153 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1154 
1155 	/* Set the lane data rate */
1156 	set_lane_data_rate(kmb_dsi, dphy_no, cfg);
1157 
1158 	/* High-Speed Tx Slew Rate Calibration
1159 	 * BitRate: > 1.5 Gbps && <= 2.5 Gbps: slew rate control OFF
1160 	 */
1161 	if (cfg->lane_rate_mbps > 1500)
1162 		set_slewrate_gt_1500(kmb_dsi, dphy_no);
1163 	else if (cfg->lane_rate_mbps > 1000)
1164 		set_slewrate_gt_1000(kmb_dsi, dphy_no);
1165 	else
1166 		set_slewrate_lt_1000(kmb_dsi, dphy_no);
1167 
1168 	/* Set cfgclkfreqrange */
1169 	val = (((cfg->cfg_clk_khz / 1000) - 17) * 4) & 0x3f;
1170 	SET_DPHY_FREQ_CTRL0_3(kmb_dsi, dphy_no, val);
1171 
1172 	/* Enable config clk for the corresponding d-phy */
1173 	kmb_set_bit_mipi(kmb_dsi, DPHY_CFG_CLK_EN, dphy_no);
1174 
1175 	/* PLL setup */
1176 	if (mode == MIPI_DPHY_MASTER)
1177 		setup_pll(kmb_dsi, dphy_no, cfg);
1178 
1179 	/* Send NORMAL OPERATION test code */
1180 	test_code = 0x0;
1181 	test_data = 0x0;
1182 	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
1183 
1184 	/* Configure BASEDIR for data lanes
1185 	 * NOTE: basedir only applies to LANE_0 of each D-PHY.
1186 	 * The other lanes keep their direction based on the D-PHY type,
1187 	 * either Rx or Tx.
1188 	 * bits[5:0]  - BaseDir: 1 = Rx
1189 	 * bits[9:6] - BaseDir: 0 = Tx
1190 	 */
1191 	kmb_write_bits_mipi(kmb_dsi, DPHY_INIT_CTRL2, 0, 9, 0x03f);
1192 	ndelay(15);
1193 
1194 	/* Enable CLOCK LANE
1195 	 * Clock lane should be enabled regardless of the direction
1196 	 * set for the D-PHY (Rx/Tx)
1197 	 */
1198 	kmb_set_bit_mipi(kmb_dsi, DPHY_INIT_CTRL2, 12 + dphy_no);
1199 
1200 	/* Enable DATA LANES */
1201 	kmb_write_bits_mipi(kmb_dsi, DPHY_ENABLE, dphy_no * 2, 2,
1202 			    ((1 << active_lanes) - 1));
1203 
1204 	ndelay(15);
1205 
1206 	/* Take D-PHY out of shutdown mode */
1207 	/* Deassert SHUTDOWNZ signal */
1208 	SET_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, SHUTDOWNZ);
1209 	ndelay(15);
1210 
1211 	/* Deassert RSTZ signal */
1212 	SET_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, RESETZ);
1213 }
1214 
dphy_wait_fsm(struct kmb_dsi * kmb_dsi,u32 dphy_no,enum dphy_tx_fsm fsm_state)1215 static void dphy_wait_fsm(struct kmb_dsi *kmb_dsi, u32 dphy_no,
1216 			  enum dphy_tx_fsm fsm_state)
1217 {
1218 	enum dphy_tx_fsm val = DPHY_TX_POWERDWN;
1219 	int i = 0;
1220 	int status = 1;
1221 
1222 	do {
1223 		test_mode_send(kmb_dsi, dphy_no, TEST_CODE_FSM_CONTROL, 0x80);
1224 
1225 		val = GET_TEST_DOUT4_7(kmb_dsi, dphy_no);
1226 		i++;
1227 		if (i > TIMEOUT) {
1228 			status = 0;
1229 			break;
1230 		}
1231 	} while (val != fsm_state);
1232 
1233 	dev_dbg(kmb_dsi->dev, "%s: dphy %d val = %x", __func__, dphy_no, val);
1234 	dev_dbg(kmb_dsi->dev, "* DPHY %d WAIT_FSM %s *",
1235 		dphy_no, status ? "SUCCESS" : "FAILED");
1236 }
1237 
wait_init_done(struct kmb_dsi * kmb_dsi,u32 dphy_no,u32 active_lanes)1238 static void wait_init_done(struct kmb_dsi *kmb_dsi, u32 dphy_no,
1239 			   u32 active_lanes)
1240 {
1241 	u32 stopstatedata = 0;
1242 	u32 data_lanes = (1 << active_lanes) - 1;
1243 	int i = 0;
1244 	int status = 1;
1245 
1246 	do {
1247 		stopstatedata = GET_STOPSTATE_DATA(kmb_dsi, dphy_no)
1248 				& data_lanes;
1249 
1250 		/* TODO-need to add a time out and return failure */
1251 		i++;
1252 
1253 		if (i > TIMEOUT) {
1254 			status = 0;
1255 			dev_dbg(kmb_dsi->dev,
1256 				"! WAIT_INIT_DONE: TIMING OUT!(err_stat=%d)",
1257 				kmb_read_mipi(kmb_dsi, MIPI_DPHY_ERR_STAT6_7));
1258 			break;
1259 		}
1260 	} while (stopstatedata != data_lanes);
1261 
1262 	dev_dbg(kmb_dsi->dev, "* DPHY %d INIT - %s *",
1263 		dphy_no, status ? "SUCCESS" : "FAILED");
1264 }
1265 
wait_pll_lock(struct kmb_dsi * kmb_dsi,u32 dphy_no)1266 static void wait_pll_lock(struct kmb_dsi *kmb_dsi, u32 dphy_no)
1267 {
1268 	int i = 0;
1269 	int status = 1;
1270 
1271 	do {
1272 		/* TODO-need to add a time out and return failure */
1273 		i++;
1274 		if (i > TIMEOUT) {
1275 			status = 0;
1276 			dev_dbg(kmb_dsi->dev, "%s: timing out", __func__);
1277 			break;
1278 		}
1279 	} while (!GET_PLL_LOCK(kmb_dsi, dphy_no));
1280 
1281 	dev_dbg(kmb_dsi->dev, "* PLL Locked for DPHY %d - %s *",
1282 		dphy_no, status ? "SUCCESS" : "FAILED");
1283 }
1284 
mipi_tx_init_dphy(struct kmb_dsi * kmb_dsi,struct mipi_ctrl_cfg * cfg)1285 static u32 mipi_tx_init_dphy(struct kmb_dsi *kmb_dsi,
1286 			     struct mipi_ctrl_cfg *cfg)
1287 {
1288 	u32 dphy_no = MIPI_DPHY6;
1289 
1290 	/* Multiple D-PHYs needed */
1291 	if (cfg->active_lanes > MIPI_DPHY_D_LANES) {
1292 		/*
1293 		 *Initialization for Tx aggregation mode is done according to
1294 		 *a. start init PHY1
1295 		 *b. poll for PHY1 FSM state LOCK
1296 		 *   b1. reg addr 0x03[3:0] - state_main[3:0] == 5 (LOCK)
1297 		 *c. poll for PHY1 calibrations done :
1298 		 *   c1. termination calibration lower section: addr 0x22[5]
1299 		 *   - rescal_done
1300 		 *   c2. slewrate calibration (if data rate < = 1500 Mbps):
1301 		 *     addr 0xA7[3:2] - srcal_done, sr_finished
1302 		 *d. start init PHY0
1303 		 *e. poll for PHY0 stopstate
1304 		 *f. poll for PHY1 stopstate
1305 		 */
1306 		/* PHY #N+1 ('slave') */
1307 
1308 		dphy_init_sequence(kmb_dsi, cfg, dphy_no + 1,
1309 				   (cfg->active_lanes - MIPI_DPHY_D_LANES),
1310 				   MIPI_DPHY_SLAVE);
1311 		dphy_wait_fsm(kmb_dsi, dphy_no + 1, DPHY_TX_LOCK);
1312 
1313 		/* PHY #N master */
1314 		dphy_init_sequence(kmb_dsi, cfg, dphy_no, MIPI_DPHY_D_LANES,
1315 				   MIPI_DPHY_MASTER);
1316 
1317 		/* Wait for DPHY init to complete */
1318 		wait_init_done(kmb_dsi, dphy_no, MIPI_DPHY_D_LANES);
1319 		wait_init_done(kmb_dsi, dphy_no + 1,
1320 			       cfg->active_lanes - MIPI_DPHY_D_LANES);
1321 		wait_pll_lock(kmb_dsi, dphy_no);
1322 		wait_pll_lock(kmb_dsi, dphy_no + 1);
1323 		dphy_wait_fsm(kmb_dsi, dphy_no, DPHY_TX_IDLE);
1324 	} else {		/* Single DPHY */
1325 		dphy_init_sequence(kmb_dsi, cfg, dphy_no, cfg->active_lanes,
1326 				   MIPI_DPHY_MASTER);
1327 		dphy_wait_fsm(kmb_dsi, dphy_no, DPHY_TX_IDLE);
1328 		wait_init_done(kmb_dsi, dphy_no, cfg->active_lanes);
1329 		wait_pll_lock(kmb_dsi, dphy_no);
1330 	}
1331 
1332 	return 0;
1333 }
1334 
connect_lcd_to_mipi(struct kmb_dsi * kmb_dsi,struct drm_atomic_state * old_state)1335 static void connect_lcd_to_mipi(struct kmb_dsi *kmb_dsi,
1336 				struct drm_atomic_state *old_state)
1337 {
1338 	struct regmap *msscam;
1339 
1340 	msscam = syscon_regmap_lookup_by_compatible("intel,keembay-msscam");
1341 	if (IS_ERR(msscam)) {
1342 		dev_dbg(kmb_dsi->dev, "failed to get msscam syscon");
1343 		return;
1344 	}
1345 	drm_atomic_bridge_chain_enable(adv_bridge, old_state);
1346 	/* DISABLE MIPI->CIF CONNECTION */
1347 	regmap_write(msscam, MSS_MIPI_CIF_CFG, 0);
1348 
1349 	/* ENABLE LCD->MIPI CONNECTION */
1350 	regmap_write(msscam, MSS_LCD_MIPI_CFG, 1);
1351 	/* DISABLE LCD->CIF LOOPBACK */
1352 	regmap_write(msscam, MSS_LOOPBACK_CFG, 1);
1353 }
1354 
kmb_dsi_mode_set(struct kmb_dsi * kmb_dsi,struct drm_display_mode * mode,int sys_clk_mhz,struct drm_atomic_state * old_state)1355 int kmb_dsi_mode_set(struct kmb_dsi *kmb_dsi, struct drm_display_mode *mode,
1356 		     int sys_clk_mhz, struct drm_atomic_state *old_state)
1357 {
1358 	u64 data_rate;
1359 
1360 	kmb_dsi->sys_clk_mhz = sys_clk_mhz;
1361 	mipi_tx_init_cfg.active_lanes = MIPI_TX_ACTIVE_LANES;
1362 
1363 	mipi_tx_frame0_sect_cfg.width_pixels = mode->crtc_hdisplay;
1364 	mipi_tx_frame0_sect_cfg.height_lines = mode->crtc_vdisplay;
1365 	mipitx_frame0_cfg.vsync_width =
1366 		mode->crtc_vsync_end - mode->crtc_vsync_start;
1367 	mipitx_frame0_cfg.v_backporch =
1368 		mode->crtc_vtotal - mode->crtc_vsync_end;
1369 	mipitx_frame0_cfg.v_frontporch =
1370 		mode->crtc_vsync_start - mode->crtc_vdisplay;
1371 	mipitx_frame0_cfg.hsync_width =
1372 		mode->crtc_hsync_end - mode->crtc_hsync_start;
1373 	mipitx_frame0_cfg.h_backporch =
1374 		mode->crtc_htotal - mode->crtc_hsync_end;
1375 	mipitx_frame0_cfg.h_frontporch =
1376 		mode->crtc_hsync_start - mode->crtc_hdisplay;
1377 
1378 	/* Lane rate = (vtotal*htotal*fps*bpp)/4 / 1000000
1379 	 * to convert to Mbps
1380 	 */
1381 	data_rate = ((((u32)mode->crtc_vtotal *	(u32)mode->crtc_htotal) *
1382 			(u32)(drm_mode_vrefresh(mode)) *
1383 			MIPI_TX_BPP) / mipi_tx_init_cfg.active_lanes) /	1000000;
1384 
1385 	dev_dbg(kmb_dsi->dev, "data_rate=%u active_lanes=%d\n",
1386 		(u32)data_rate, mipi_tx_init_cfg.active_lanes);
1387 
1388 	/* When late rate < 800, modeset fails with 4 lanes,
1389 	 * so switch to 2 lanes
1390 	 */
1391 	if (data_rate < 800) {
1392 		mipi_tx_init_cfg.active_lanes = 2;
1393 		mipi_tx_init_cfg.lane_rate_mbps = data_rate * 2;
1394 	} else {
1395 		mipi_tx_init_cfg.lane_rate_mbps = data_rate;
1396 	}
1397 
1398 	/* Initialize mipi controller */
1399 	mipi_tx_init_cntrl(kmb_dsi, &mipi_tx_init_cfg);
1400 
1401 	/* Dphy initialization */
1402 	mipi_tx_init_dphy(kmb_dsi, &mipi_tx_init_cfg);
1403 
1404 	connect_lcd_to_mipi(kmb_dsi, old_state);
1405 	dev_info(kmb_dsi->dev, "mipi hw initialized");
1406 
1407 	return 0;
1408 }
1409 
kmb_dsi_init(struct platform_device * pdev)1410 struct kmb_dsi *kmb_dsi_init(struct platform_device *pdev)
1411 {
1412 	struct kmb_dsi *kmb_dsi;
1413 	struct device *dev = get_device(&pdev->dev);
1414 
1415 	kmb_dsi = devm_kzalloc(dev, sizeof(*kmb_dsi), GFP_KERNEL);
1416 	if (!kmb_dsi) {
1417 		dev_err(dev, "failed to allocate kmb_dsi\n");
1418 		return ERR_PTR(-ENOMEM);
1419 	}
1420 
1421 	kmb_dsi->host = dsi_host;
1422 	kmb_dsi->host->ops = &kmb_dsi_host_ops;
1423 
1424 	dsi_device->host = kmb_dsi->host;
1425 	kmb_dsi->device = dsi_device;
1426 
1427 	return kmb_dsi;
1428 }
1429 
kmb_dsi_encoder_init(struct drm_device * dev,struct kmb_dsi * kmb_dsi)1430 int kmb_dsi_encoder_init(struct drm_device *dev, struct kmb_dsi *kmb_dsi)
1431 {
1432 	struct drm_encoder *encoder;
1433 	struct drm_connector *connector;
1434 	int ret = 0;
1435 
1436 	encoder = &kmb_dsi->base;
1437 	encoder->possible_crtcs = 1;
1438 	encoder->possible_clones = 0;
1439 
1440 	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DSI);
1441 	if (ret) {
1442 		dev_err(kmb_dsi->dev, "Failed to init encoder %d\n", ret);
1443 		return ret;
1444 	}
1445 
1446 	/* Link drm_bridge to encoder */
1447 	ret = drm_bridge_attach(encoder, adv_bridge, NULL,
1448 				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
1449 	if (ret) {
1450 		drm_encoder_cleanup(encoder);
1451 		return ret;
1452 	}
1453 	drm_info(dev, "Bridge attached : SUCCESS");
1454 	connector = drm_bridge_connector_init(dev, encoder);
1455 	if (IS_ERR(connector)) {
1456 		DRM_ERROR("Unable to create bridge connector");
1457 		drm_encoder_cleanup(encoder);
1458 		return PTR_ERR(connector);
1459 	}
1460 	drm_connector_attach_encoder(connector, encoder);
1461 	return 0;
1462 }
1463 
kmb_dsi_map_mmio(struct kmb_dsi * kmb_dsi)1464 int kmb_dsi_map_mmio(struct kmb_dsi *kmb_dsi)
1465 {
1466 	struct resource *res;
1467 	struct device *dev = kmb_dsi->dev;
1468 
1469 	res = platform_get_resource_byname(kmb_dsi->pdev, IORESOURCE_MEM,
1470 					   "mipi");
1471 	if (!res) {
1472 		dev_err(dev, "failed to get resource for mipi");
1473 		return -ENOMEM;
1474 	}
1475 	kmb_dsi->mipi_mmio = devm_ioremap_resource(dev, res);
1476 	if (IS_ERR(kmb_dsi->mipi_mmio)) {
1477 		dev_err(dev, "failed to ioremap mipi registers");
1478 		return PTR_ERR(kmb_dsi->mipi_mmio);
1479 	}
1480 	return 0;
1481 }
1482 
kmb_dsi_clk_enable(struct kmb_dsi * kmb_dsi)1483 static int kmb_dsi_clk_enable(struct kmb_dsi *kmb_dsi)
1484 {
1485 	int ret;
1486 	struct device *dev = kmb_dsi->dev;
1487 
1488 	ret = clk_prepare_enable(kmb_dsi->clk_mipi);
1489 	if (ret) {
1490 		dev_err(dev, "Failed to enable MIPI clock: %d\n", ret);
1491 		return ret;
1492 	}
1493 
1494 	ret = clk_prepare_enable(kmb_dsi->clk_mipi_ecfg);
1495 	if (ret) {
1496 		dev_err(dev, "Failed to enable MIPI_ECFG clock: %d\n", ret);
1497 		return ret;
1498 	}
1499 
1500 	ret = clk_prepare_enable(kmb_dsi->clk_mipi_cfg);
1501 	if (ret) {
1502 		dev_err(dev, "Failed to enable MIPI_CFG clock: %d\n", ret);
1503 		return ret;
1504 	}
1505 
1506 	dev_info(dev, "SUCCESS : enabled MIPI clocks\n");
1507 	return 0;
1508 }
1509 
kmb_dsi_clk_init(struct kmb_dsi * kmb_dsi)1510 int kmb_dsi_clk_init(struct kmb_dsi *kmb_dsi)
1511 {
1512 	struct device *dev = kmb_dsi->dev;
1513 	unsigned long clk;
1514 
1515 	kmb_dsi->clk_mipi = devm_clk_get(dev, "clk_mipi");
1516 	if (IS_ERR(kmb_dsi->clk_mipi)) {
1517 		dev_err(dev, "devm_clk_get() failed clk_mipi\n");
1518 		return PTR_ERR(kmb_dsi->clk_mipi);
1519 	}
1520 
1521 	kmb_dsi->clk_mipi_ecfg = devm_clk_get(dev, "clk_mipi_ecfg");
1522 	if (IS_ERR(kmb_dsi->clk_mipi_ecfg)) {
1523 		dev_err(dev, "devm_clk_get() failed clk_mipi_ecfg\n");
1524 		return PTR_ERR(kmb_dsi->clk_mipi_ecfg);
1525 	}
1526 
1527 	kmb_dsi->clk_mipi_cfg = devm_clk_get(dev, "clk_mipi_cfg");
1528 	if (IS_ERR(kmb_dsi->clk_mipi_cfg)) {
1529 		dev_err(dev, "devm_clk_get() failed clk_mipi_cfg\n");
1530 		return PTR_ERR(kmb_dsi->clk_mipi_cfg);
1531 	}
1532 	/* Set MIPI clock to 24 Mhz */
1533 	clk_set_rate(kmb_dsi->clk_mipi, KMB_MIPI_DEFAULT_CLK);
1534 	if (clk_get_rate(kmb_dsi->clk_mipi) != KMB_MIPI_DEFAULT_CLK) {
1535 		dev_err(dev, "failed to set to clk_mipi to %d\n",
1536 			KMB_MIPI_DEFAULT_CLK);
1537 		return -1;
1538 	}
1539 	dev_dbg(dev, "clk_mipi = %ld\n", clk_get_rate(kmb_dsi->clk_mipi));
1540 
1541 	clk = clk_get_rate(kmb_dsi->clk_mipi_ecfg);
1542 	if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
1543 		/* Set MIPI_ECFG clock to 24 Mhz */
1544 		clk_set_rate(kmb_dsi->clk_mipi_ecfg, KMB_MIPI_DEFAULT_CFG_CLK);
1545 		clk = clk_get_rate(kmb_dsi->clk_mipi_ecfg);
1546 		if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
1547 			dev_err(dev, "failed to set to clk_mipi_ecfg to %d\n",
1548 				KMB_MIPI_DEFAULT_CFG_CLK);
1549 			return -1;
1550 		}
1551 	}
1552 
1553 	clk = clk_get_rate(kmb_dsi->clk_mipi_cfg);
1554 	if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
1555 		/* Set MIPI_CFG clock to 24 Mhz */
1556 		clk_set_rate(kmb_dsi->clk_mipi_cfg, 24000000);
1557 		clk = clk_get_rate(kmb_dsi->clk_mipi_cfg);
1558 		if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
1559 			dev_err(dev, "failed to set clk_mipi_cfg to %d\n",
1560 				KMB_MIPI_DEFAULT_CFG_CLK);
1561 			return -1;
1562 		}
1563 	}
1564 
1565 	return kmb_dsi_clk_enable(kmb_dsi);
1566 }
1567