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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2018 Intel Corporation
4 */
5
6#include "intel_combo_phy.h"
7#include "intel_de.h"
8#include "intel_display_types.h"
9
10#define for_each_combo_phy(__dev_priv, __phy) \
11 for ((__phy) = PHY_A; (__phy) < I915_MAX_PHYS; (__phy)++) \
12 for_each_if(intel_phy_is_combo(__dev_priv, __phy))
13
14#define for_each_combo_phy_reverse(__dev_priv, __phy) \
15 for ((__phy) = I915_MAX_PHYS; (__phy)-- > PHY_A;) \
16 for_each_if(intel_phy_is_combo(__dev_priv, __phy))
17
18enum {
19 PROCMON_0_85V_DOT_0,
20 PROCMON_0_95V_DOT_0,
21 PROCMON_0_95V_DOT_1,
22 PROCMON_1_05V_DOT_0,
23 PROCMON_1_05V_DOT_1,
24};
25
26static const struct cnl_procmon {
27 u32 dw1, dw9, dw10;
28} cnl_procmon_values[] = {
29 [PROCMON_0_85V_DOT_0] =
30 { .dw1 = 0x00000000, .dw9 = 0x62AB67BB, .dw10 = 0x51914F96, },
31 [PROCMON_0_95V_DOT_0] =
32 { .dw1 = 0x00000000, .dw9 = 0x86E172C7, .dw10 = 0x77CA5EAB, },
33 [PROCMON_0_95V_DOT_1] =
34 { .dw1 = 0x00000000, .dw9 = 0x93F87FE1, .dw10 = 0x8AE871C5, },
35 [PROCMON_1_05V_DOT_0] =
36 { .dw1 = 0x00000000, .dw9 = 0x98FA82DD, .dw10 = 0x89E46DC1, },
37 [PROCMON_1_05V_DOT_1] =
38 { .dw1 = 0x00440000, .dw9 = 0x9A00AB25, .dw10 = 0x8AE38FF1, },
39};
40
41/*
42 * CNL has just one set of registers, while gen11 has a set for each combo PHY.
43 * The CNL registers are equivalent to the gen11 PHY A registers, that's why we
44 * call the ICL macros even though the function has CNL on its name.
45 */
46static const struct cnl_procmon *
47cnl_get_procmon_ref_values(struct drm_i915_private *dev_priv, enum phy phy)
48{
49 const struct cnl_procmon *procmon;
50 u32 val;
51
52 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW3(phy));
53 switch (val & (PROCESS_INFO_MASK | VOLTAGE_INFO_MASK)) {
54 default:
55 MISSING_CASE(val);
56 fallthrough;
57 case VOLTAGE_INFO_0_85V | PROCESS_INFO_DOT_0:
58 procmon = &cnl_procmon_values[PROCMON_0_85V_DOT_0];
59 break;
60 case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_0:
61 procmon = &cnl_procmon_values[PROCMON_0_95V_DOT_0];
62 break;
63 case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_1:
64 procmon = &cnl_procmon_values[PROCMON_0_95V_DOT_1];
65 break;
66 case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_0:
67 procmon = &cnl_procmon_values[PROCMON_1_05V_DOT_0];
68 break;
69 case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_1:
70 procmon = &cnl_procmon_values[PROCMON_1_05V_DOT_1];
71 break;
72 }
73
74 return procmon;
75}
76
77static void cnl_set_procmon_ref_values(struct drm_i915_private *dev_priv,
78 enum phy phy)
79{
80 const struct cnl_procmon *procmon;
81 u32 val;
82
83 procmon = cnl_get_procmon_ref_values(dev_priv, phy);
84
85 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW1(phy));
86 val &= ~((0xff << 16) | 0xff);
87 val |= procmon->dw1;
88 intel_de_write(dev_priv, ICL_PORT_COMP_DW1(phy), val);
89
90 intel_de_write(dev_priv, ICL_PORT_COMP_DW9(phy), procmon->dw9);
91 intel_de_write(dev_priv, ICL_PORT_COMP_DW10(phy), procmon->dw10);
92}
93
94static bool check_phy_reg(struct drm_i915_private *dev_priv,
95 enum phy phy, i915_reg_t reg, u32 mask,
96 u32 expected_val)
97{
98 u32 val = intel_de_read(dev_priv, reg);
99
100 if ((val & mask) != expected_val) {
101 drm_dbg(&dev_priv->drm,
102 "Combo PHY %c reg %08x state mismatch: "
103 "current %08x mask %08x expected %08x\n",
104 phy_name(phy),
105 reg.reg, val, mask, expected_val);
106 return false;
107 }
108
109 return true;
110}
111
112static bool cnl_verify_procmon_ref_values(struct drm_i915_private *dev_priv,
113 enum phy phy)
114{
115 const struct cnl_procmon *procmon;
116 bool ret;
117
118 procmon = cnl_get_procmon_ref_values(dev_priv, phy);
119
120 ret = check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW1(phy),
121 (0xff << 16) | 0xff, procmon->dw1);
122 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW9(phy),
123 -1U, procmon->dw9);
124 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW10(phy),
125 -1U, procmon->dw10);
126
127 return ret;
128}
129
130static bool cnl_combo_phy_enabled(struct drm_i915_private *dev_priv)
131{
132 return !(intel_de_read(dev_priv, CHICKEN_MISC_2) & CNL_COMP_PWR_DOWN) &&
133 (intel_de_read(dev_priv, CNL_PORT_COMP_DW0) & COMP_INIT);
134}
135
136static bool cnl_combo_phy_verify_state(struct drm_i915_private *dev_priv)
137{
138 enum phy phy = PHY_A;
139 bool ret;
140
141 if (!cnl_combo_phy_enabled(dev_priv))
142 return false;
143
144 ret = cnl_verify_procmon_ref_values(dev_priv, phy);
145
146 ret &= check_phy_reg(dev_priv, phy, CNL_PORT_CL1CM_DW5,
147 CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
148
149 return ret;
150}
151
152static void cnl_combo_phys_init(struct drm_i915_private *dev_priv)
153{
154 u32 val;
155
156 val = intel_de_read(dev_priv, CHICKEN_MISC_2);
157 val &= ~CNL_COMP_PWR_DOWN;
158 intel_de_write(dev_priv, CHICKEN_MISC_2, val);
159
160 /* Dummy PORT_A to get the correct CNL register from the ICL macro */
161 cnl_set_procmon_ref_values(dev_priv, PHY_A);
162
163 val = intel_de_read(dev_priv, CNL_PORT_COMP_DW0);
164 val |= COMP_INIT;
165 intel_de_write(dev_priv, CNL_PORT_COMP_DW0, val);
166
167 val = intel_de_read(dev_priv, CNL_PORT_CL1CM_DW5);
168 val |= CL_POWER_DOWN_ENABLE;
169 intel_de_write(dev_priv, CNL_PORT_CL1CM_DW5, val);
170}
171
172static void cnl_combo_phys_uninit(struct drm_i915_private *dev_priv)
173{
174 u32 val;
175
176 if (!cnl_combo_phy_verify_state(dev_priv))
177 drm_warn(&dev_priv->drm,
178 "Combo PHY HW state changed unexpectedly.\n");
179
180 val = intel_de_read(dev_priv, CHICKEN_MISC_2);
181 val |= CNL_COMP_PWR_DOWN;
182 intel_de_write(dev_priv, CHICKEN_MISC_2, val);
183}
184
185static bool has_phy_misc(struct drm_i915_private *i915, enum phy phy)
186{
187 /*
188 * Some platforms only expect PHY_MISC to be programmed for PHY-A and
189 * PHY-B and may not even have instances of the register for the
190 * other combo PHY's.
191 *
192 * ADL-S technically has three instances of PHY_MISC, but only requires
193 * that we program it for PHY A.
194 */
195
196 if (IS_ALDERLAKE_S(i915))
197 return phy == PHY_A;
198 else if (IS_JSL_EHL(i915) ||
199 IS_ROCKETLAKE(i915) ||
200 IS_DG1(i915))
201 return phy < PHY_C;
202
203 return true;
204}
205
206static bool icl_combo_phy_enabled(struct drm_i915_private *dev_priv,
207 enum phy phy)
208{
209 /* The PHY C added by EHL has no PHY_MISC register */
210 if (!has_phy_misc(dev_priv, phy))
211 return intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT;
212 else
213 return !(intel_de_read(dev_priv, ICL_PHY_MISC(phy)) &
214 ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN) &&
215 (intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT);
216}
217
218static bool ehl_vbt_ddi_d_present(struct drm_i915_private *i915)
219{
220 bool ddi_a_present = intel_bios_is_port_present(i915, PORT_A);
221 bool ddi_d_present = intel_bios_is_port_present(i915, PORT_D);
222 bool dsi_present = intel_bios_is_dsi_present(i915, NULL);
223
224 /*
225 * VBT's 'dvo port' field for child devices references the DDI, not
226 * the PHY. So if combo PHY A is wired up to drive an external
227 * display, we should see a child device present on PORT_D and
228 * nothing on PORT_A and no DSI.
229 */
230 if (ddi_d_present && !ddi_a_present && !dsi_present)
231 return true;
232
233 /*
234 * If we encounter a VBT that claims to have an external display on
235 * DDI-D _and_ an internal display on DDI-A/DSI leave an error message
236 * in the log and let the internal display win.
237 */
238 if (ddi_d_present)
239 drm_err(&i915->drm,
240 "VBT claims to have both internal and external displays on PHY A. Configuring for internal.\n");
241
242 return false;
243}
244
245static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
246{
247 /*
248 * Certain PHYs are connected to compensation resistors and act
249 * as masters to other PHYs.
250 *
251 * ICL,TGL:
252 * A(master) -> B(slave), C(slave)
253 * RKL,DG1:
254 * A(master) -> B(slave)
255 * C(master) -> D(slave)
256 * ADL-S:
257 * A(master) -> B(slave), C(slave)
258 * D(master) -> E(slave)
259 *
260 * We must set the IREFGEN bit for any PHY acting as a master
261 * to another PHY.
262 */
263 if (phy == PHY_A)
264 return true;
265 else if (IS_ALDERLAKE_S(dev_priv))
266 return phy == PHY_D;
267 else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
268 return phy == PHY_C;
269
270 return false;
271}
272
273static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
274 enum phy phy)
275{
276 bool ret = true;
277 u32 expected_val = 0;
278
279 if (!icl_combo_phy_enabled(dev_priv, phy))
280 return false;
281
282 if (DISPLAY_VER(dev_priv) >= 12) {
283 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
284 ICL_PORT_TX_DW8_ODCC_CLK_SEL |
285 ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK,
286 ICL_PORT_TX_DW8_ODCC_CLK_SEL |
287 ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2);
288
289 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_PCS_DW1_LN0(phy),
290 DCC_MODE_SELECT_MASK,
291 DCC_MODE_SELECT_CONTINUOSLY);
292 }
293
294 ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
295
296 if (phy_is_master(dev_priv, phy)) {
297 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
298 IREFGEN, IREFGEN);
299
300 if (IS_JSL_EHL(dev_priv)) {
301 if (ehl_vbt_ddi_d_present(dev_priv))
302 expected_val = ICL_PHY_MISC_MUX_DDID;
303
304 ret &= check_phy_reg(dev_priv, phy, ICL_PHY_MISC(phy),
305 ICL_PHY_MISC_MUX_DDID,
306 expected_val);
307 }
308 }
309
310 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_CL_DW5(phy),
311 CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
312
313 return ret;
314}
315
316void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv,
317 enum phy phy, bool is_dsi,
318 int lane_count, bool lane_reversal)
319{
320 u8 lane_mask;
321 u32 val;
322
323 if (is_dsi) {
324 drm_WARN_ON(&dev_priv->drm, lane_reversal);
325
326 switch (lane_count) {
327 case 1:
328 lane_mask = PWR_DOWN_LN_3_1_0;
329 break;
330 case 2:
331 lane_mask = PWR_DOWN_LN_3_1;
332 break;
333 case 3:
334 lane_mask = PWR_DOWN_LN_3;
335 break;
336 default:
337 MISSING_CASE(lane_count);
338 fallthrough;
339 case 4:
340 lane_mask = PWR_UP_ALL_LANES;
341 break;
342 }
343 } else {
344 switch (lane_count) {
345 case 1:
346 lane_mask = lane_reversal ? PWR_DOWN_LN_2_1_0 :
347 PWR_DOWN_LN_3_2_1;
348 break;
349 case 2:
350 lane_mask = lane_reversal ? PWR_DOWN_LN_1_0 :
351 PWR_DOWN_LN_3_2;
352 break;
353 default:
354 MISSING_CASE(lane_count);
355 fallthrough;
356 case 4:
357 lane_mask = PWR_UP_ALL_LANES;
358 break;
359 }
360 }
361
362 val = intel_de_read(dev_priv, ICL_PORT_CL_DW10(phy));
363 val &= ~PWR_DOWN_LN_MASK;
364 val |= lane_mask << PWR_DOWN_LN_SHIFT;
365 intel_de_write(dev_priv, ICL_PORT_CL_DW10(phy), val);
366}
367
368static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
369{
370 enum phy phy;
371
372 for_each_combo_phy(dev_priv, phy) {
373 u32 val;
374
375 if (icl_combo_phy_verify_state(dev_priv, phy)) {
376 drm_dbg(&dev_priv->drm,
377 "Combo PHY %c already enabled, won't reprogram it.\n",
378 phy_name(phy));
379 continue;
380 }
381
382 if (!has_phy_misc(dev_priv, phy))
383 goto skip_phy_misc;
384
385 /*
386 * EHL's combo PHY A can be hooked up to either an external
387 * display (via DDI-D) or an internal display (via DDI-A or
388 * the DSI DPHY). This is a motherboard design decision that
389 * can't be changed on the fly, so initialize the PHY's mux
390 * based on whether our VBT indicates the presence of any
391 * "internal" child devices.
392 */
393 val = intel_de_read(dev_priv, ICL_PHY_MISC(phy));
394 if (IS_JSL_EHL(dev_priv) && phy == PHY_A) {
395 val &= ~ICL_PHY_MISC_MUX_DDID;
396
397 if (ehl_vbt_ddi_d_present(dev_priv))
398 val |= ICL_PHY_MISC_MUX_DDID;
399 }
400
401 val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
402 intel_de_write(dev_priv, ICL_PHY_MISC(phy), val);
403
404skip_phy_misc:
405 if (DISPLAY_VER(dev_priv) >= 12) {
406 val = intel_de_read(dev_priv, ICL_PORT_TX_DW8_LN0(phy));
407 val &= ~ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK;
408 val |= ICL_PORT_TX_DW8_ODCC_CLK_SEL;
409 val |= ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2;
410 intel_de_write(dev_priv, ICL_PORT_TX_DW8_GRP(phy), val);
411
412 val = intel_de_read(dev_priv, ICL_PORT_PCS_DW1_LN0(phy));
413 val &= ~DCC_MODE_SELECT_MASK;
414 val |= DCC_MODE_SELECT_CONTINUOSLY;
415 intel_de_write(dev_priv, ICL_PORT_PCS_DW1_GRP(phy), val);
416 }
417
418 cnl_set_procmon_ref_values(dev_priv, phy);
419
420 if (phy_is_master(dev_priv, phy)) {
421 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW8(phy));
422 val |= IREFGEN;
423 intel_de_write(dev_priv, ICL_PORT_COMP_DW8(phy), val);
424 }
425
426 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy));
427 val |= COMP_INIT;
428 intel_de_write(dev_priv, ICL_PORT_COMP_DW0(phy), val);
429
430 val = intel_de_read(dev_priv, ICL_PORT_CL_DW5(phy));
431 val |= CL_POWER_DOWN_ENABLE;
432 intel_de_write(dev_priv, ICL_PORT_CL_DW5(phy), val);
433 }
434}
435
436static void icl_combo_phys_uninit(struct drm_i915_private *dev_priv)
437{
438 enum phy phy;
439
440 for_each_combo_phy_reverse(dev_priv, phy) {
441 u32 val;
442
443 if (phy == PHY_A &&
444 !icl_combo_phy_verify_state(dev_priv, phy)) {
445 if (IS_TIGERLAKE(dev_priv) || IS_DG1(dev_priv)) {
446 /*
447 * A known problem with old ifwi:
448 * https://gitlab.freedesktop.org/drm/intel/-/issues/2411
449 * Suppress the warning for CI. Remove ASAP!
450 */
451 drm_dbg_kms(&dev_priv->drm,
452 "Combo PHY %c HW state changed unexpectedly\n",
453 phy_name(phy));
454 } else {
455 drm_warn(&dev_priv->drm,
456 "Combo PHY %c HW state changed unexpectedly\n",
457 phy_name(phy));
458 }
459 }
460
461 if (!has_phy_misc(dev_priv, phy))
462 goto skip_phy_misc;
463
464 val = intel_de_read(dev_priv, ICL_PHY_MISC(phy));
465 val |= ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
466 intel_de_write(dev_priv, ICL_PHY_MISC(phy), val);
467
468skip_phy_misc:
469 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy));
470 val &= ~COMP_INIT;
471 intel_de_write(dev_priv, ICL_PORT_COMP_DW0(phy), val);
472 }
473}
474
475void intel_combo_phy_init(struct drm_i915_private *i915)
476{
477 if (DISPLAY_VER(i915) >= 11)
478 icl_combo_phys_init(i915);
479 else if (IS_CANNONLAKE(i915))
480 cnl_combo_phys_init(i915);
481}
482
483void intel_combo_phy_uninit(struct drm_i915_private *i915)
484{
485 if (DISPLAY_VER(i915) >= 11)
486 icl_combo_phys_uninit(i915);
487 else if (IS_CANNONLAKE(i915))
488 cnl_combo_phys_uninit(i915);
489}