1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2018 Intel Corporation
4  */
5 
6 #include "i915_reg.h"
7 #include "intel_combo_phy.h"
8 #include "intel_combo_phy_regs.h"
9 #include "intel_de.h"
10 #include "intel_display_types.h"
11 
12 #define for_each_combo_phy(__dev_priv, __phy) \
13 	for ((__phy) = PHY_A; (__phy) < I915_MAX_PHYS; (__phy)++)	\
14 		for_each_if(intel_phy_is_combo(__dev_priv, __phy))
15 
16 #define for_each_combo_phy_reverse(__dev_priv, __phy) \
17 	for ((__phy) = I915_MAX_PHYS; (__phy)-- > PHY_A;) \
18 		for_each_if(intel_phy_is_combo(__dev_priv, __phy))
19 
20 enum {
21 	PROCMON_0_85V_DOT_0,
22 	PROCMON_0_95V_DOT_0,
23 	PROCMON_0_95V_DOT_1,
24 	PROCMON_1_05V_DOT_0,
25 	PROCMON_1_05V_DOT_1,
26 };
27 
28 static const struct icl_procmon {
29 	const char *name;
30 	u32 dw1, dw9, dw10;
31 } icl_procmon_values[] = {
32 	[PROCMON_0_85V_DOT_0] = {
33 		.name = "0.85V dot0 (low-voltage)",
34 		.dw1 = 0x00000000, .dw9 = 0x62AB67BB, .dw10 = 0x51914F96,
35 	},
36 	[PROCMON_0_95V_DOT_0] = {
37 		.name = "0.95V dot0",
38 		.dw1 = 0x00000000, .dw9 = 0x86E172C7, .dw10 = 0x77CA5EAB,
39 	},
40 	[PROCMON_0_95V_DOT_1] = {
41 		.name = "0.95V dot1",
42 		.dw1 = 0x00000000, .dw9 = 0x93F87FE1, .dw10 = 0x8AE871C5,
43 	},
44 	[PROCMON_1_05V_DOT_0] = {
45 		.name = "1.05V dot0",
46 		.dw1 = 0x00000000, .dw9 = 0x98FA82DD, .dw10 = 0x89E46DC1,
47 	},
48 	[PROCMON_1_05V_DOT_1] = {
49 		.name = "1.05V dot1",
50 		.dw1 = 0x00440000, .dw9 = 0x9A00AB25, .dw10 = 0x8AE38FF1,
51 	},
52 };
53 
54 static const struct icl_procmon *
55 icl_get_procmon_ref_values(struct drm_i915_private *dev_priv, enum phy phy)
56 {
57 	u32 val;
58 
59 	val = intel_de_read(dev_priv, ICL_PORT_COMP_DW3(phy));
60 	switch (val & (PROCESS_INFO_MASK | VOLTAGE_INFO_MASK)) {
61 	default:
62 		MISSING_CASE(val);
63 		fallthrough;
64 	case VOLTAGE_INFO_0_85V | PROCESS_INFO_DOT_0:
65 		return &icl_procmon_values[PROCMON_0_85V_DOT_0];
66 	case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_0:
67 		return &icl_procmon_values[PROCMON_0_95V_DOT_0];
68 	case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_1:
69 		return &icl_procmon_values[PROCMON_0_95V_DOT_1];
70 	case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_0:
71 		return &icl_procmon_values[PROCMON_1_05V_DOT_0];
72 	case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_1:
73 		return &icl_procmon_values[PROCMON_1_05V_DOT_1];
74 	}
75 }
76 
77 static void icl_set_procmon_ref_values(struct drm_i915_private *dev_priv,
78 				       enum phy phy)
79 {
80 	const struct icl_procmon *procmon;
81 
82 	procmon = icl_get_procmon_ref_values(dev_priv, phy);
83 
84 	intel_de_rmw(dev_priv, ICL_PORT_COMP_DW1(phy),
85 		     (0xff << 16) | 0xff, procmon->dw1);
86 
87 	intel_de_write(dev_priv, ICL_PORT_COMP_DW9(phy), procmon->dw9);
88 	intel_de_write(dev_priv, ICL_PORT_COMP_DW10(phy), procmon->dw10);
89 }
90 
91 static bool check_phy_reg(struct drm_i915_private *dev_priv,
92 			  enum phy phy, i915_reg_t reg, u32 mask,
93 			  u32 expected_val)
94 {
95 	u32 val = intel_de_read(dev_priv, reg);
96 
97 	if ((val & mask) != expected_val) {
98 		drm_dbg(&dev_priv->drm,
99 			"Combo PHY %c reg %08x state mismatch: "
100 			"current %08x mask %08x expected %08x\n",
101 			phy_name(phy),
102 			reg.reg, val, mask, expected_val);
103 		return false;
104 	}
105 
106 	return true;
107 }
108 
109 static bool icl_verify_procmon_ref_values(struct drm_i915_private *dev_priv,
110 					  enum phy phy)
111 {
112 	const struct icl_procmon *procmon;
113 	bool ret;
114 
115 	procmon = icl_get_procmon_ref_values(dev_priv, phy);
116 
117 	drm_dbg_kms(&dev_priv->drm,
118 		    "Combo PHY %c Voltage/Process Info : %s\n",
119 		    phy_name(phy), procmon->name);
120 
121 	ret = check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW1(phy),
122 			    (0xff << 16) | 0xff, procmon->dw1);
123 	ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW9(phy),
124 			     -1U, procmon->dw9);
125 	ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW10(phy),
126 			     -1U, procmon->dw10);
127 
128 	return ret;
129 }
130 
131 static bool has_phy_misc(struct drm_i915_private *i915, enum phy phy)
132 {
133 	/*
134 	 * Some platforms only expect PHY_MISC to be programmed for PHY-A and
135 	 * PHY-B and may not even have instances of the register for the
136 	 * other combo PHY's.
137 	 *
138 	 * ADL-S technically has three instances of PHY_MISC, but only requires
139 	 * that we program it for PHY A.
140 	 */
141 
142 	if (IS_ALDERLAKE_S(i915))
143 		return phy == PHY_A;
144 	else if ((IS_JASPERLAKE(i915) || IS_ELKHARTLAKE(i915)) ||
145 		 IS_ROCKETLAKE(i915) ||
146 		 IS_DG1(i915))
147 		return phy < PHY_C;
148 
149 	return true;
150 }
151 
152 static bool icl_combo_phy_enabled(struct drm_i915_private *dev_priv,
153 				  enum phy phy)
154 {
155 	/* The PHY C added by EHL has no PHY_MISC register */
156 	if (!has_phy_misc(dev_priv, phy))
157 		return intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT;
158 	else
159 		return !(intel_de_read(dev_priv, ICL_PHY_MISC(phy)) &
160 			 ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN) &&
161 			(intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT);
162 }
163 
164 static bool ehl_vbt_ddi_d_present(struct drm_i915_private *i915)
165 {
166 	bool ddi_a_present = intel_bios_is_port_present(i915, PORT_A);
167 	bool ddi_d_present = intel_bios_is_port_present(i915, PORT_D);
168 	bool dsi_present = intel_bios_is_dsi_present(i915, NULL);
169 
170 	/*
171 	 * VBT's 'dvo port' field for child devices references the DDI, not
172 	 * the PHY.  So if combo PHY A is wired up to drive an external
173 	 * display, we should see a child device present on PORT_D and
174 	 * nothing on PORT_A and no DSI.
175 	 */
176 	if (ddi_d_present && !ddi_a_present && !dsi_present)
177 		return true;
178 
179 	/*
180 	 * If we encounter a VBT that claims to have an external display on
181 	 * DDI-D _and_ an internal display on DDI-A/DSI leave an error message
182 	 * in the log and let the internal display win.
183 	 */
184 	if (ddi_d_present)
185 		drm_err(&i915->drm,
186 			"VBT claims to have both internal and external displays on PHY A.  Configuring for internal.\n");
187 
188 	return false;
189 }
190 
191 static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
192 {
193 	/*
194 	 * Certain PHYs are connected to compensation resistors and act
195 	 * as masters to other PHYs.
196 	 *
197 	 * ICL,TGL:
198 	 *   A(master) -> B(slave), C(slave)
199 	 * RKL,DG1:
200 	 *   A(master) -> B(slave)
201 	 *   C(master) -> D(slave)
202 	 * ADL-S:
203 	 *   A(master) -> B(slave), C(slave)
204 	 *   D(master) -> E(slave)
205 	 *
206 	 * We must set the IREFGEN bit for any PHY acting as a master
207 	 * to another PHY.
208 	 */
209 	if (phy == PHY_A)
210 		return true;
211 	else if (IS_ALDERLAKE_S(dev_priv))
212 		return phy == PHY_D;
213 	else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
214 		return phy == PHY_C;
215 
216 	return false;
217 }
218 
219 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
220 				       enum phy phy)
221 {
222 	bool ret = true;
223 	u32 expected_val = 0;
224 
225 	if (!icl_combo_phy_enabled(dev_priv, phy))
226 		return false;
227 
228 	if (DISPLAY_VER(dev_priv) >= 12) {
229 		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN(0, phy),
230 				     ICL_PORT_TX_DW8_ODCC_CLK_SEL |
231 				     ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK,
232 				     ICL_PORT_TX_DW8_ODCC_CLK_SEL |
233 				     ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2);
234 
235 		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_PCS_DW1_LN(0, phy),
236 				     DCC_MODE_SELECT_MASK, RUN_DCC_ONCE);
237 	}
238 
239 	ret &= icl_verify_procmon_ref_values(dev_priv, phy);
240 
241 	if (phy_is_master(dev_priv, phy)) {
242 		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
243 				     IREFGEN, IREFGEN);
244 
245 		if (IS_JASPERLAKE(dev_priv) || IS_ELKHARTLAKE(dev_priv)) {
246 			if (ehl_vbt_ddi_d_present(dev_priv))
247 				expected_val = ICL_PHY_MISC_MUX_DDID;
248 
249 			ret &= check_phy_reg(dev_priv, phy, ICL_PHY_MISC(phy),
250 					     ICL_PHY_MISC_MUX_DDID,
251 					     expected_val);
252 		}
253 	}
254 
255 	ret &= check_phy_reg(dev_priv, phy, ICL_PORT_CL_DW5(phy),
256 			     CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
257 
258 	return ret;
259 }
260 
261 void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv,
262 				    enum phy phy, bool is_dsi,
263 				    int lane_count, bool lane_reversal)
264 {
265 	u8 lane_mask;
266 
267 	if (is_dsi) {
268 		drm_WARN_ON(&dev_priv->drm, lane_reversal);
269 
270 		switch (lane_count) {
271 		case 1:
272 			lane_mask = PWR_DOWN_LN_3_1_0;
273 			break;
274 		case 2:
275 			lane_mask = PWR_DOWN_LN_3_1;
276 			break;
277 		case 3:
278 			lane_mask = PWR_DOWN_LN_3;
279 			break;
280 		default:
281 			MISSING_CASE(lane_count);
282 			fallthrough;
283 		case 4:
284 			lane_mask = PWR_UP_ALL_LANES;
285 			break;
286 		}
287 	} else {
288 		switch (lane_count) {
289 		case 1:
290 			lane_mask = lane_reversal ? PWR_DOWN_LN_2_1_0 :
291 						    PWR_DOWN_LN_3_2_1;
292 			break;
293 		case 2:
294 			lane_mask = lane_reversal ? PWR_DOWN_LN_1_0 :
295 						    PWR_DOWN_LN_3_2;
296 			break;
297 		default:
298 			MISSING_CASE(lane_count);
299 			fallthrough;
300 		case 4:
301 			lane_mask = PWR_UP_ALL_LANES;
302 			break;
303 		}
304 	}
305 
306 	intel_de_rmw(dev_priv, ICL_PORT_CL_DW10(phy),
307 		     PWR_DOWN_LN_MASK, lane_mask);
308 }
309 
310 static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
311 {
312 	enum phy phy;
313 
314 	for_each_combo_phy(dev_priv, phy) {
315 		u32 val;
316 
317 		if (icl_combo_phy_verify_state(dev_priv, phy)) {
318 			drm_dbg(&dev_priv->drm,
319 				"Combo PHY %c already enabled, won't reprogram it.\n",
320 				phy_name(phy));
321 			continue;
322 		}
323 
324 		if (!has_phy_misc(dev_priv, phy))
325 			goto skip_phy_misc;
326 
327 		/*
328 		 * EHL's combo PHY A can be hooked up to either an external
329 		 * display (via DDI-D) or an internal display (via DDI-A or
330 		 * the DSI DPHY).  This is a motherboard design decision that
331 		 * can't be changed on the fly, so initialize the PHY's mux
332 		 * based on whether our VBT indicates the presence of any
333 		 * "internal" child devices.
334 		 */
335 		val = intel_de_read(dev_priv, ICL_PHY_MISC(phy));
336 		if ((IS_JASPERLAKE(dev_priv) || IS_ELKHARTLAKE(dev_priv)) &&
337 		    phy == PHY_A) {
338 			val &= ~ICL_PHY_MISC_MUX_DDID;
339 
340 			if (ehl_vbt_ddi_d_present(dev_priv))
341 				val |= ICL_PHY_MISC_MUX_DDID;
342 		}
343 
344 		val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
345 		intel_de_write(dev_priv, ICL_PHY_MISC(phy), val);
346 
347 skip_phy_misc:
348 		if (DISPLAY_VER(dev_priv) >= 12) {
349 			val = intel_de_read(dev_priv, ICL_PORT_TX_DW8_LN(0, phy));
350 			val &= ~ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK;
351 			val |= ICL_PORT_TX_DW8_ODCC_CLK_SEL;
352 			val |= ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2;
353 			intel_de_write(dev_priv, ICL_PORT_TX_DW8_GRP(phy), val);
354 
355 			val = intel_de_read(dev_priv, ICL_PORT_PCS_DW1_LN(0, phy));
356 			val &= ~DCC_MODE_SELECT_MASK;
357 			val |= RUN_DCC_ONCE;
358 			intel_de_write(dev_priv, ICL_PORT_PCS_DW1_GRP(phy), val);
359 		}
360 
361 		icl_set_procmon_ref_values(dev_priv, phy);
362 
363 		if (phy_is_master(dev_priv, phy))
364 			intel_de_rmw(dev_priv, ICL_PORT_COMP_DW8(phy),
365 				     0, IREFGEN);
366 
367 		intel_de_rmw(dev_priv, ICL_PORT_COMP_DW0(phy), 0, COMP_INIT);
368 		intel_de_rmw(dev_priv, ICL_PORT_CL_DW5(phy),
369 			     0, CL_POWER_DOWN_ENABLE);
370 	}
371 }
372 
373 static void icl_combo_phys_uninit(struct drm_i915_private *dev_priv)
374 {
375 	enum phy phy;
376 
377 	for_each_combo_phy_reverse(dev_priv, phy) {
378 		if (phy == PHY_A &&
379 		    !icl_combo_phy_verify_state(dev_priv, phy)) {
380 			if (IS_TIGERLAKE(dev_priv) || IS_DG1(dev_priv)) {
381 				/*
382 				 * A known problem with old ifwi:
383 				 * https://gitlab.freedesktop.org/drm/intel/-/issues/2411
384 				 * Suppress the warning for CI. Remove ASAP!
385 				 */
386 				drm_dbg_kms(&dev_priv->drm,
387 					    "Combo PHY %c HW state changed unexpectedly\n",
388 					    phy_name(phy));
389 			} else {
390 				drm_warn(&dev_priv->drm,
391 					 "Combo PHY %c HW state changed unexpectedly\n",
392 					 phy_name(phy));
393 			}
394 		}
395 
396 		if (!has_phy_misc(dev_priv, phy))
397 			goto skip_phy_misc;
398 
399 		intel_de_rmw(dev_priv, ICL_PHY_MISC(phy), 0,
400 			     ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN);
401 
402 skip_phy_misc:
403 		intel_de_rmw(dev_priv, ICL_PORT_COMP_DW0(phy), COMP_INIT, 0);
404 	}
405 }
406 
407 void intel_combo_phy_init(struct drm_i915_private *i915)
408 {
409 	icl_combo_phys_init(i915);
410 }
411 
412 void intel_combo_phy_uninit(struct drm_i915_private *i915)
413 {
414 	icl_combo_phys_uninit(i915);
415 }
416