1 /*
2  * Copyright © 2013 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  * Authors:
24  *	Shobhit Kumar <shobhit.kumar@intel.com>
25  *	Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com>
26  */
27 
28 #include <linux/kernel.h>
29 #include <linux/string_helpers.h>
30 
31 #include "i915_drv.h"
32 #include "intel_de.h"
33 #include "intel_display_types.h"
34 #include "intel_dsi.h"
35 #include "vlv_dsi_pll.h"
36 #include "vlv_dsi_pll_regs.h"
37 #include "vlv_sideband.h"
38 
39 static const u16 lfsr_converts[] = {
40 	426, 469, 234, 373, 442, 221, 110, 311, 411,		/* 62 - 70 */
41 	461, 486, 243, 377, 188, 350, 175, 343, 427, 213,	/* 71 - 80 */
42 	106, 53, 282, 397, 454, 227, 113, 56, 284, 142,		/* 81 - 90 */
43 	71, 35, 273, 136, 324, 418, 465, 488, 500, 506		/* 91 - 100 */
44 };
45 
46 /* Get DSI clock from pixel clock */
dsi_clk_from_pclk(u32 pclk,enum mipi_dsi_pixel_format fmt,int lane_count)47 static u32 dsi_clk_from_pclk(u32 pclk, enum mipi_dsi_pixel_format fmt,
48 			     int lane_count)
49 {
50 	u32 dsi_clk_khz;
51 	u32 bpp = mipi_dsi_pixel_format_to_bpp(fmt);
52 
53 	/* DSI data rate = pixel clock * bits per pixel / lane count
54 	   pixel clock is converted from KHz to Hz */
55 	dsi_clk_khz = DIV_ROUND_CLOSEST(pclk * bpp, lane_count);
56 
57 	return dsi_clk_khz;
58 }
59 
dsi_calc_mnp(struct drm_i915_private * dev_priv,struct intel_crtc_state * config,int target_dsi_clk)60 static int dsi_calc_mnp(struct drm_i915_private *dev_priv,
61 			struct intel_crtc_state *config,
62 			int target_dsi_clk)
63 {
64 	unsigned int m_min, m_max, p_min = 2, p_max = 6;
65 	unsigned int m, n, p;
66 	unsigned int calc_m, calc_p;
67 	int delta, ref_clk;
68 
69 	/* target_dsi_clk is expected in kHz */
70 	if (target_dsi_clk < 300000 || target_dsi_clk > 1150000) {
71 		drm_err(&dev_priv->drm, "DSI CLK Out of Range\n");
72 		return -ECHRNG;
73 	}
74 
75 	if (IS_CHERRYVIEW(dev_priv)) {
76 		ref_clk = 100000;
77 		n = 4;
78 		m_min = 70;
79 		m_max = 96;
80 	} else {
81 		ref_clk = 25000;
82 		n = 1;
83 		m_min = 62;
84 		m_max = 92;
85 	}
86 
87 	calc_p = p_min;
88 	calc_m = m_min;
89 	delta = abs(target_dsi_clk - (m_min * ref_clk) / (p_min * n));
90 
91 	for (m = m_min; m <= m_max && delta; m++) {
92 		for (p = p_min; p <= p_max && delta; p++) {
93 			/*
94 			 * Find the optimal m and p divisors with minimal delta
95 			 * +/- the required clock
96 			 */
97 			int calc_dsi_clk = (m * ref_clk) / (p * n);
98 			int d = abs(target_dsi_clk - calc_dsi_clk);
99 			if (d < delta) {
100 				delta = d;
101 				calc_m = m;
102 				calc_p = p;
103 			}
104 		}
105 	}
106 
107 	/* register has log2(N1), this works fine for powers of two */
108 	config->dsi_pll.ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + calc_p - 2);
109 	config->dsi_pll.div =
110 		(ffs(n) - 1) << DSI_PLL_N1_DIV_SHIFT |
111 		(u32)lfsr_converts[calc_m - 62] << DSI_PLL_M1_DIV_SHIFT;
112 
113 	return 0;
114 }
115 
vlv_dsi_pclk(struct intel_encoder * encoder,struct intel_crtc_state * config)116 static int vlv_dsi_pclk(struct intel_encoder *encoder,
117 			struct intel_crtc_state *config)
118 {
119 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
120 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
121 	int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
122 	u32 dsi_clock;
123 	u32 pll_ctl, pll_div;
124 	u32 m = 0, p = 0, n;
125 	int refclk = IS_CHERRYVIEW(dev_priv) ? 100000 : 25000;
126 	int i;
127 
128 	pll_ctl = config->dsi_pll.ctrl;
129 	pll_div = config->dsi_pll.div;
130 
131 	/* mask out other bits and extract the P1 divisor */
132 	pll_ctl &= DSI_PLL_P1_POST_DIV_MASK;
133 	pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2);
134 
135 	/* N1 divisor */
136 	n = (pll_div & DSI_PLL_N1_DIV_MASK) >> DSI_PLL_N1_DIV_SHIFT;
137 	n = 1 << n; /* register has log2(N1) */
138 
139 	/* mask out the other bits and extract the M1 divisor */
140 	pll_div &= DSI_PLL_M1_DIV_MASK;
141 	pll_div = pll_div >> DSI_PLL_M1_DIV_SHIFT;
142 
143 	while (pll_ctl) {
144 		pll_ctl = pll_ctl >> 1;
145 		p++;
146 	}
147 	p--;
148 
149 	if (!p) {
150 		drm_err(&dev_priv->drm, "wrong P1 divisor\n");
151 		return 0;
152 	}
153 
154 	for (i = 0; i < ARRAY_SIZE(lfsr_converts); i++) {
155 		if (lfsr_converts[i] == pll_div)
156 			break;
157 	}
158 
159 	if (i == ARRAY_SIZE(lfsr_converts)) {
160 		drm_err(&dev_priv->drm, "wrong m_seed programmed\n");
161 		return 0;
162 	}
163 
164 	m = i + 62;
165 
166 	dsi_clock = (m * refclk) / (p * n);
167 
168 	return DIV_ROUND_CLOSEST(dsi_clock * intel_dsi->lane_count, bpp);
169 }
170 
171 /*
172  * XXX: The muxing and gating is hard coded for now. Need to add support for
173  * sharing PLLs with two DSI outputs.
174  */
vlv_dsi_pll_compute(struct intel_encoder * encoder,struct intel_crtc_state * config)175 int vlv_dsi_pll_compute(struct intel_encoder *encoder,
176 			struct intel_crtc_state *config)
177 {
178 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
179 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
180 	int pclk, dsi_clk, ret;
181 
182 	dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
183 				    intel_dsi->lane_count);
184 
185 	ret = dsi_calc_mnp(dev_priv, config, dsi_clk);
186 	if (ret) {
187 		drm_dbg_kms(&dev_priv->drm, "dsi_calc_mnp failed\n");
188 		return ret;
189 	}
190 
191 	if (intel_dsi->ports & (1 << PORT_A))
192 		config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI0_DSIPLL;
193 
194 	if (intel_dsi->ports & (1 << PORT_C))
195 		config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI1_DSIPLL;
196 
197 	config->dsi_pll.ctrl |= DSI_PLL_VCO_EN;
198 
199 	drm_dbg_kms(&dev_priv->drm, "dsi pll div %08x, ctrl %08x\n",
200 		    config->dsi_pll.div, config->dsi_pll.ctrl);
201 
202 	pclk = vlv_dsi_pclk(encoder, config);
203 	config->port_clock = pclk;
204 
205 	/* FIXME definitely not right for burst/cmd mode/pixel overlap */
206 	config->hw.adjusted_mode.crtc_clock = pclk;
207 	if (intel_dsi->dual_link)
208 		config->hw.adjusted_mode.crtc_clock *= 2;
209 
210 	return 0;
211 }
212 
vlv_dsi_pll_enable(struct intel_encoder * encoder,const struct intel_crtc_state * config)213 void vlv_dsi_pll_enable(struct intel_encoder *encoder,
214 			const struct intel_crtc_state *config)
215 {
216 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
217 
218 	drm_dbg_kms(&dev_priv->drm, "\n");
219 
220 	vlv_cck_get(dev_priv);
221 
222 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
223 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, config->dsi_pll.div);
224 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL,
225 		      config->dsi_pll.ctrl & ~DSI_PLL_VCO_EN);
226 
227 	/* wait at least 0.5 us after ungating before enabling VCO,
228 	 * allow hrtimer subsystem optimization by relaxing timing
229 	 */
230 	usleep_range(10, 50);
231 
232 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl);
233 
234 	if (wait_for(vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL) &
235 						DSI_PLL_LOCK, 20)) {
236 
237 		vlv_cck_put(dev_priv);
238 		drm_err(&dev_priv->drm, "DSI PLL lock failed\n");
239 		return;
240 	}
241 	vlv_cck_put(dev_priv);
242 
243 	drm_dbg_kms(&dev_priv->drm, "DSI PLL locked\n");
244 }
245 
vlv_dsi_pll_disable(struct intel_encoder * encoder)246 void vlv_dsi_pll_disable(struct intel_encoder *encoder)
247 {
248 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
249 	u32 tmp;
250 
251 	drm_dbg_kms(&dev_priv->drm, "\n");
252 
253 	vlv_cck_get(dev_priv);
254 
255 	tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
256 	tmp &= ~DSI_PLL_VCO_EN;
257 	tmp |= DSI_PLL_LDO_GATE;
258 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
259 
260 	vlv_cck_put(dev_priv);
261 }
262 
bxt_dsi_pll_is_enabled(struct drm_i915_private * dev_priv)263 bool bxt_dsi_pll_is_enabled(struct drm_i915_private *dev_priv)
264 {
265 	bool enabled;
266 	u32 val;
267 	u32 mask;
268 
269 	mask = BXT_DSI_PLL_DO_ENABLE | BXT_DSI_PLL_LOCKED;
270 	val = intel_de_read(dev_priv, BXT_DSI_PLL_ENABLE);
271 	enabled = (val & mask) == mask;
272 
273 	if (!enabled)
274 		return false;
275 
276 	/*
277 	 * Dividers must be programmed with valid values. As per BSEPC, for
278 	 * GEMINLAKE only PORT A divider values are checked while for BXT
279 	 * both divider values are validated. Check this here for
280 	 * paranoia, since BIOS is known to misconfigure PLLs in this way at
281 	 * times, and since accessing DSI registers with invalid dividers
282 	 * causes a system hang.
283 	 */
284 	val = intel_de_read(dev_priv, BXT_DSI_PLL_CTL);
285 	if (IS_GEMINILAKE(dev_priv)) {
286 		if (!(val & BXT_DSIA_16X_MASK)) {
287 			drm_dbg(&dev_priv->drm,
288 				"Invalid PLL divider (%08x)\n", val);
289 			enabled = false;
290 		}
291 	} else {
292 		if (!(val & BXT_DSIA_16X_MASK) || !(val & BXT_DSIC_16X_MASK)) {
293 			drm_dbg(&dev_priv->drm,
294 				"Invalid PLL divider (%08x)\n", val);
295 			enabled = false;
296 		}
297 	}
298 
299 	return enabled;
300 }
301 
bxt_dsi_pll_disable(struct intel_encoder * encoder)302 void bxt_dsi_pll_disable(struct intel_encoder *encoder)
303 {
304 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
305 
306 	drm_dbg_kms(&dev_priv->drm, "\n");
307 
308 	intel_de_rmw(dev_priv, BXT_DSI_PLL_ENABLE, BXT_DSI_PLL_DO_ENABLE, 0);
309 
310 	/*
311 	 * PLL lock should deassert within 200us.
312 	 * Wait up to 1ms before timing out.
313 	 */
314 	if (intel_de_wait_for_clear(dev_priv, BXT_DSI_PLL_ENABLE,
315 				    BXT_DSI_PLL_LOCKED, 1))
316 		drm_err(&dev_priv->drm,
317 			"Timeout waiting for PLL lock deassertion\n");
318 }
319 
vlv_dsi_get_pclk(struct intel_encoder * encoder,struct intel_crtc_state * config)320 u32 vlv_dsi_get_pclk(struct intel_encoder *encoder,
321 		     struct intel_crtc_state *config)
322 {
323 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
324 	u32 pll_ctl, pll_div;
325 
326 	drm_dbg_kms(&dev_priv->drm, "\n");
327 
328 	vlv_cck_get(dev_priv);
329 	pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
330 	pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER);
331 	vlv_cck_put(dev_priv);
332 
333 	config->dsi_pll.ctrl = pll_ctl & ~DSI_PLL_LOCK;
334 	config->dsi_pll.div = pll_div;
335 
336 	return vlv_dsi_pclk(encoder, config);
337 }
338 
bxt_dsi_pclk(struct intel_encoder * encoder,const struct intel_crtc_state * config)339 static int bxt_dsi_pclk(struct intel_encoder *encoder,
340 			const struct intel_crtc_state *config)
341 {
342 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
343 	int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
344 	u32 dsi_ratio, dsi_clk;
345 
346 	dsi_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
347 	dsi_clk = (dsi_ratio * BXT_REF_CLOCK_KHZ) / 2;
348 
349 	return DIV_ROUND_CLOSEST(dsi_clk * intel_dsi->lane_count, bpp);
350 }
351 
bxt_dsi_get_pclk(struct intel_encoder * encoder,struct intel_crtc_state * config)352 u32 bxt_dsi_get_pclk(struct intel_encoder *encoder,
353 		     struct intel_crtc_state *config)
354 {
355 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
356 	u32 pclk;
357 
358 	config->dsi_pll.ctrl = intel_de_read(dev_priv, BXT_DSI_PLL_CTL);
359 
360 	pclk = bxt_dsi_pclk(encoder, config);
361 
362 	drm_dbg(&dev_priv->drm, "Calculated pclk=%u\n", pclk);
363 	return pclk;
364 }
365 
vlv_dsi_reset_clocks(struct intel_encoder * encoder,enum port port)366 void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
367 {
368 	u32 temp;
369 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
370 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
371 
372 	temp = intel_de_read(dev_priv, MIPI_CTRL(port));
373 	temp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
374 	intel_de_write(dev_priv, MIPI_CTRL(port),
375 		       temp | intel_dsi->escape_clk_div << ESCAPE_CLOCK_DIVIDER_SHIFT);
376 }
377 
glk_dsi_program_esc_clock(struct drm_device * dev,const struct intel_crtc_state * config)378 static void glk_dsi_program_esc_clock(struct drm_device *dev,
379 				   const struct intel_crtc_state *config)
380 {
381 	struct drm_i915_private *dev_priv = to_i915(dev);
382 	u32 dsi_rate = 0;
383 	u32 pll_ratio = 0;
384 	u32 ddr_clk = 0;
385 	u32 div1_value = 0;
386 	u32 div2_value = 0;
387 	u32 txesc1_div = 0;
388 	u32 txesc2_div = 0;
389 
390 	pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
391 
392 	dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
393 
394 	ddr_clk = dsi_rate / 2;
395 
396 	/* Variable divider value */
397 	div1_value = DIV_ROUND_CLOSEST(ddr_clk, 20000);
398 
399 	/* Calculate TXESC1 divider */
400 	if (div1_value <= 10)
401 		txesc1_div = div1_value;
402 	else if ((div1_value > 10) && (div1_value <= 20))
403 		txesc1_div = DIV_ROUND_UP(div1_value, 2);
404 	else if ((div1_value > 20) && (div1_value <= 30))
405 		txesc1_div = DIV_ROUND_UP(div1_value, 4);
406 	else if ((div1_value > 30) && (div1_value <= 40))
407 		txesc1_div = DIV_ROUND_UP(div1_value, 6);
408 	else if ((div1_value > 40) && (div1_value <= 50))
409 		txesc1_div = DIV_ROUND_UP(div1_value, 8);
410 	else
411 		txesc1_div = 10;
412 
413 	/* Calculate TXESC2 divider */
414 	div2_value = DIV_ROUND_UP(div1_value, txesc1_div);
415 
416 	txesc2_div = min_t(u32, div2_value, 10);
417 
418 	intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV1,
419 		       (1 << (txesc1_div - 1)) & GLK_TX_ESC_CLK_DIV1_MASK);
420 	intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV2,
421 		       (1 << (txesc2_div - 1)) & GLK_TX_ESC_CLK_DIV2_MASK);
422 }
423 
424 /* Program BXT Mipi clocks and dividers */
bxt_dsi_program_clocks(struct drm_device * dev,enum port port,const struct intel_crtc_state * config)425 static void bxt_dsi_program_clocks(struct drm_device *dev, enum port port,
426 				   const struct intel_crtc_state *config)
427 {
428 	struct drm_i915_private *dev_priv = to_i915(dev);
429 	u32 tmp;
430 	u32 dsi_rate = 0;
431 	u32 pll_ratio = 0;
432 	u32 rx_div;
433 	u32 tx_div;
434 	u32 rx_div_upper;
435 	u32 rx_div_lower;
436 	u32 mipi_8by3_divider;
437 
438 	/* Clear old configurations */
439 	tmp = intel_de_read(dev_priv, BXT_MIPI_CLOCK_CTL);
440 	tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
441 	tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port));
442 	tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
443 	tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port));
444 
445 	/* Get the current DSI rate(actual) */
446 	pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
447 	dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
448 
449 	/*
450 	 * tx clock should be <= 20MHz and the div value must be
451 	 * subtracted by 1 as per bspec
452 	 */
453 	tx_div = DIV_ROUND_UP(dsi_rate, 20000) - 1;
454 	/*
455 	 * rx clock should be <= 150MHz and the div value must be
456 	 * subtracted by 1 as per bspec
457 	 */
458 	rx_div = DIV_ROUND_UP(dsi_rate, 150000) - 1;
459 
460 	/*
461 	 * rx divider value needs to be updated in the
462 	 * two differnt bit fields in the register hence splitting the
463 	 * rx divider value accordingly
464 	 */
465 	rx_div_lower = rx_div & RX_DIVIDER_BIT_1_2;
466 	rx_div_upper = (rx_div & RX_DIVIDER_BIT_3_4) >> 2;
467 
468 	mipi_8by3_divider = 0x2;
469 
470 	tmp |= BXT_MIPI_8X_BY3_DIVIDER(port, mipi_8by3_divider);
471 	tmp |= BXT_MIPI_TX_ESCLK_DIVIDER(port, tx_div);
472 	tmp |= BXT_MIPI_RX_ESCLK_LOWER_DIVIDER(port, rx_div_lower);
473 	tmp |= BXT_MIPI_RX_ESCLK_UPPER_DIVIDER(port, rx_div_upper);
474 
475 	intel_de_write(dev_priv, BXT_MIPI_CLOCK_CTL, tmp);
476 }
477 
bxt_dsi_pll_compute(struct intel_encoder * encoder,struct intel_crtc_state * config)478 int bxt_dsi_pll_compute(struct intel_encoder *encoder,
479 			struct intel_crtc_state *config)
480 {
481 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
482 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
483 	u8 dsi_ratio, dsi_ratio_min, dsi_ratio_max;
484 	u32 dsi_clk;
485 	int pclk;
486 
487 	dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
488 				    intel_dsi->lane_count);
489 
490 	/*
491 	 * From clock diagram, to get PLL ratio divider, divide double of DSI
492 	 * link rate (i.e., 2*8x=16x frequency value) by ref clock. Make sure to
493 	 * round 'up' the result
494 	 */
495 	dsi_ratio = DIV_ROUND_UP(dsi_clk * 2, BXT_REF_CLOCK_KHZ);
496 
497 	if (IS_BROXTON(dev_priv)) {
498 		dsi_ratio_min = BXT_DSI_PLL_RATIO_MIN;
499 		dsi_ratio_max = BXT_DSI_PLL_RATIO_MAX;
500 	} else {
501 		dsi_ratio_min = GLK_DSI_PLL_RATIO_MIN;
502 		dsi_ratio_max = GLK_DSI_PLL_RATIO_MAX;
503 	}
504 
505 	if (dsi_ratio < dsi_ratio_min || dsi_ratio > dsi_ratio_max) {
506 		drm_err(&dev_priv->drm,
507 			"Can't get a suitable ratio from DSI PLL ratios\n");
508 		return -ECHRNG;
509 	} else
510 		drm_dbg_kms(&dev_priv->drm, "DSI PLL calculation is Done!!\n");
511 
512 	/*
513 	 * Program DSI ratio and Select MIPIC and MIPIA PLL output as 8x
514 	 * Spec says both have to be programmed, even if one is not getting
515 	 * used. Configure MIPI_CLOCK_CTL dividers in modeset
516 	 */
517 	config->dsi_pll.ctrl = dsi_ratio | BXT_DSIA_16X_BY2 | BXT_DSIC_16X_BY2;
518 
519 	/* As per recommendation from hardware team,
520 	 * Prog PVD ratio =1 if dsi ratio <= 50
521 	 */
522 	if (IS_BROXTON(dev_priv) && dsi_ratio <= 50)
523 		config->dsi_pll.ctrl |= BXT_DSI_PLL_PVD_RATIO_1;
524 
525 	pclk = bxt_dsi_pclk(encoder, config);
526 	config->port_clock = pclk;
527 
528 	/* FIXME definitely not right for burst/cmd mode/pixel overlap */
529 	config->hw.adjusted_mode.crtc_clock = pclk;
530 	if (intel_dsi->dual_link)
531 		config->hw.adjusted_mode.crtc_clock *= 2;
532 
533 	return 0;
534 }
535 
bxt_dsi_pll_enable(struct intel_encoder * encoder,const struct intel_crtc_state * config)536 void bxt_dsi_pll_enable(struct intel_encoder *encoder,
537 			const struct intel_crtc_state *config)
538 {
539 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
540 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
541 	enum port port;
542 
543 	drm_dbg_kms(&dev_priv->drm, "\n");
544 
545 	/* Configure PLL vales */
546 	intel_de_write(dev_priv, BXT_DSI_PLL_CTL, config->dsi_pll.ctrl);
547 	intel_de_posting_read(dev_priv, BXT_DSI_PLL_CTL);
548 
549 	/* Program TX, RX, Dphy clocks */
550 	if (IS_BROXTON(dev_priv)) {
551 		for_each_dsi_port(port, intel_dsi->ports)
552 			bxt_dsi_program_clocks(encoder->base.dev, port, config);
553 	} else {
554 		glk_dsi_program_esc_clock(encoder->base.dev, config);
555 	}
556 
557 	/* Enable DSI PLL */
558 	intel_de_rmw(dev_priv, BXT_DSI_PLL_ENABLE, 0, BXT_DSI_PLL_DO_ENABLE);
559 
560 	/* Timeout and fail if PLL not locked */
561 	if (intel_de_wait_for_set(dev_priv, BXT_DSI_PLL_ENABLE,
562 				  BXT_DSI_PLL_LOCKED, 1)) {
563 		drm_err(&dev_priv->drm,
564 			"Timed out waiting for DSI PLL to lock\n");
565 		return;
566 	}
567 
568 	drm_dbg_kms(&dev_priv->drm, "DSI PLL locked\n");
569 }
570 
bxt_dsi_reset_clocks(struct intel_encoder * encoder,enum port port)571 void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
572 {
573 	u32 tmp;
574 	struct drm_device *dev = encoder->base.dev;
575 	struct drm_i915_private *dev_priv = to_i915(dev);
576 
577 	/* Clear old configurations */
578 	if (IS_BROXTON(dev_priv)) {
579 		tmp = intel_de_read(dev_priv, BXT_MIPI_CLOCK_CTL);
580 		tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
581 		tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port));
582 		tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
583 		tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port));
584 		intel_de_write(dev_priv, BXT_MIPI_CLOCK_CTL, tmp);
585 	} else {
586 		intel_de_rmw(dev_priv, MIPIO_TXESC_CLK_DIV1, GLK_TX_ESC_CLK_DIV1_MASK, 0);
587 
588 		intel_de_rmw(dev_priv, MIPIO_TXESC_CLK_DIV2, GLK_TX_ESC_CLK_DIV2_MASK, 0);
589 	}
590 	intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), CLOCKSTOP);
591 }
592 
assert_dsi_pll(struct drm_i915_private * i915,bool state)593 static void assert_dsi_pll(struct drm_i915_private *i915, bool state)
594 {
595 	bool cur_state;
596 
597 	vlv_cck_get(i915);
598 	cur_state = vlv_cck_read(i915, CCK_REG_DSI_PLL_CONTROL) & DSI_PLL_VCO_EN;
599 	vlv_cck_put(i915);
600 
601 	I915_STATE_WARN(i915, cur_state != state,
602 			"DSI PLL state assertion failure (expected %s, current %s)\n",
603 			str_on_off(state), str_on_off(cur_state));
604 }
605 
assert_dsi_pll_enabled(struct drm_i915_private * i915)606 void assert_dsi_pll_enabled(struct drm_i915_private *i915)
607 {
608 	assert_dsi_pll(i915, true);
609 }
610 
assert_dsi_pll_disabled(struct drm_i915_private * i915)611 void assert_dsi_pll_disabled(struct drm_i915_private *i915)
612 {
613 	assert_dsi_pll(i915, false);
614 }
615