WIP FPC-III support
[linux/fpc-iii.git] / drivers / gpu / drm / i915 / display / intel_combo_phy.c
blobd5ad61e4083e55a7224ba477a015ccec7cfcd151
1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2018 Intel Corporation
4 */
6 #include "intel_combo_phy.h"
7 #include "intel_display_types.h"
9 #define for_each_combo_phy(__dev_priv, __phy) \
10 for ((__phy) = PHY_A; (__phy) < I915_MAX_PHYS; (__phy)++) \
11 for_each_if(intel_phy_is_combo(__dev_priv, __phy))
13 #define for_each_combo_phy_reverse(__dev_priv, __phy) \
14 for ((__phy) = I915_MAX_PHYS; (__phy)-- > PHY_A;) \
15 for_each_if(intel_phy_is_combo(__dev_priv, __phy))
17 enum {
18 PROCMON_0_85V_DOT_0,
19 PROCMON_0_95V_DOT_0,
20 PROCMON_0_95V_DOT_1,
21 PROCMON_1_05V_DOT_0,
22 PROCMON_1_05V_DOT_1,
25 static const struct cnl_procmon {
26 u32 dw1, dw9, dw10;
27 } cnl_procmon_values[] = {
28 [PROCMON_0_85V_DOT_0] =
29 { .dw1 = 0x00000000, .dw9 = 0x62AB67BB, .dw10 = 0x51914F96, },
30 [PROCMON_0_95V_DOT_0] =
31 { .dw1 = 0x00000000, .dw9 = 0x86E172C7, .dw10 = 0x77CA5EAB, },
32 [PROCMON_0_95V_DOT_1] =
33 { .dw1 = 0x00000000, .dw9 = 0x93F87FE1, .dw10 = 0x8AE871C5, },
34 [PROCMON_1_05V_DOT_0] =
35 { .dw1 = 0x00000000, .dw9 = 0x98FA82DD, .dw10 = 0x89E46DC1, },
36 [PROCMON_1_05V_DOT_1] =
37 { .dw1 = 0x00440000, .dw9 = 0x9A00AB25, .dw10 = 0x8AE38FF1, },
41 * CNL has just one set of registers, while gen11 has a set for each combo PHY.
42 * The CNL registers are equivalent to the gen11 PHY A registers, that's why we
43 * call the ICL macros even though the function has CNL on its name.
45 static const struct cnl_procmon *
46 cnl_get_procmon_ref_values(struct drm_i915_private *dev_priv, enum phy phy)
48 const struct cnl_procmon *procmon;
49 u32 val;
51 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW3(phy));
52 switch (val & (PROCESS_INFO_MASK | VOLTAGE_INFO_MASK)) {
53 default:
54 MISSING_CASE(val);
55 fallthrough;
56 case VOLTAGE_INFO_0_85V | PROCESS_INFO_DOT_0:
57 procmon = &cnl_procmon_values[PROCMON_0_85V_DOT_0];
58 break;
59 case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_0:
60 procmon = &cnl_procmon_values[PROCMON_0_95V_DOT_0];
61 break;
62 case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_1:
63 procmon = &cnl_procmon_values[PROCMON_0_95V_DOT_1];
64 break;
65 case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_0:
66 procmon = &cnl_procmon_values[PROCMON_1_05V_DOT_0];
67 break;
68 case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_1:
69 procmon = &cnl_procmon_values[PROCMON_1_05V_DOT_1];
70 break;
73 return procmon;
76 static void cnl_set_procmon_ref_values(struct drm_i915_private *dev_priv,
77 enum phy phy)
79 const struct cnl_procmon *procmon;
80 u32 val;
82 procmon = cnl_get_procmon_ref_values(dev_priv, phy);
84 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW1(phy));
85 val &= ~((0xff << 16) | 0xff);
86 val |= procmon->dw1;
87 intel_de_write(dev_priv, ICL_PORT_COMP_DW1(phy), val);
89 intel_de_write(dev_priv, ICL_PORT_COMP_DW9(phy), procmon->dw9);
90 intel_de_write(dev_priv, ICL_PORT_COMP_DW10(phy), procmon->dw10);
93 static bool check_phy_reg(struct drm_i915_private *dev_priv,
94 enum phy phy, i915_reg_t reg, u32 mask,
95 u32 expected_val)
97 u32 val = intel_de_read(dev_priv, reg);
99 if ((val & mask) != expected_val) {
100 drm_dbg(&dev_priv->drm,
101 "Combo PHY %c reg %08x state mismatch: "
102 "current %08x mask %08x expected %08x\n",
103 phy_name(phy),
104 reg.reg, val, mask, expected_val);
105 return false;
108 return true;
111 static bool cnl_verify_procmon_ref_values(struct drm_i915_private *dev_priv,
112 enum phy phy)
114 const struct cnl_procmon *procmon;
115 bool ret;
117 procmon = cnl_get_procmon_ref_values(dev_priv, phy);
119 ret = check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW1(phy),
120 (0xff << 16) | 0xff, procmon->dw1);
121 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW9(phy),
122 -1U, procmon->dw9);
123 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW10(phy),
124 -1U, procmon->dw10);
126 return ret;
129 static bool cnl_combo_phy_enabled(struct drm_i915_private *dev_priv)
131 return !(intel_de_read(dev_priv, CHICKEN_MISC_2) & CNL_COMP_PWR_DOWN) &&
132 (intel_de_read(dev_priv, CNL_PORT_COMP_DW0) & COMP_INIT);
135 static bool cnl_combo_phy_verify_state(struct drm_i915_private *dev_priv)
137 enum phy phy = PHY_A;
138 bool ret;
140 if (!cnl_combo_phy_enabled(dev_priv))
141 return false;
143 ret = cnl_verify_procmon_ref_values(dev_priv, phy);
145 ret &= check_phy_reg(dev_priv, phy, CNL_PORT_CL1CM_DW5,
146 CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
148 return ret;
151 static void cnl_combo_phys_init(struct drm_i915_private *dev_priv)
153 u32 val;
155 val = intel_de_read(dev_priv, CHICKEN_MISC_2);
156 val &= ~CNL_COMP_PWR_DOWN;
157 intel_de_write(dev_priv, CHICKEN_MISC_2, val);
159 /* Dummy PORT_A to get the correct CNL register from the ICL macro */
160 cnl_set_procmon_ref_values(dev_priv, PHY_A);
162 val = intel_de_read(dev_priv, CNL_PORT_COMP_DW0);
163 val |= COMP_INIT;
164 intel_de_write(dev_priv, CNL_PORT_COMP_DW0, val);
166 val = intel_de_read(dev_priv, CNL_PORT_CL1CM_DW5);
167 val |= CL_POWER_DOWN_ENABLE;
168 intel_de_write(dev_priv, CNL_PORT_CL1CM_DW5, val);
171 static void cnl_combo_phys_uninit(struct drm_i915_private *dev_priv)
173 u32 val;
175 if (!cnl_combo_phy_verify_state(dev_priv))
176 drm_warn(&dev_priv->drm,
177 "Combo PHY HW state changed unexpectedly.\n");
179 val = intel_de_read(dev_priv, CHICKEN_MISC_2);
180 val |= CNL_COMP_PWR_DOWN;
181 intel_de_write(dev_priv, CHICKEN_MISC_2, val);
184 static bool has_phy_misc(struct drm_i915_private *i915, enum phy phy)
187 * Some platforms only expect PHY_MISC to be programmed for PHY-A and
188 * PHY-B and may not even have instances of the register for the
189 * other combo PHY's.
191 if (IS_JSL_EHL(i915) ||
192 IS_ROCKETLAKE(i915) ||
193 IS_DG1(i915))
194 return phy < PHY_C;
196 return true;
199 static bool icl_combo_phy_enabled(struct drm_i915_private *dev_priv,
200 enum phy phy)
202 /* The PHY C added by EHL has no PHY_MISC register */
203 if (!has_phy_misc(dev_priv, phy))
204 return intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT;
205 else
206 return !(intel_de_read(dev_priv, ICL_PHY_MISC(phy)) &
207 ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN) &&
208 (intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT);
211 static bool ehl_vbt_ddi_d_present(struct drm_i915_private *i915)
213 bool ddi_a_present = intel_bios_is_port_present(i915, PORT_A);
214 bool ddi_d_present = intel_bios_is_port_present(i915, PORT_D);
215 bool dsi_present = intel_bios_is_dsi_present(i915, NULL);
218 * VBT's 'dvo port' field for child devices references the DDI, not
219 * the PHY. So if combo PHY A is wired up to drive an external
220 * display, we should see a child device present on PORT_D and
221 * nothing on PORT_A and no DSI.
223 if (ddi_d_present && !ddi_a_present && !dsi_present)
224 return true;
227 * If we encounter a VBT that claims to have an external display on
228 * DDI-D _and_ an internal display on DDI-A/DSI leave an error message
229 * in the log and let the internal display win.
231 if (ddi_d_present)
232 drm_err(&i915->drm,
233 "VBT claims to have both internal and external displays on PHY A. Configuring for internal.\n");
235 return false;
238 static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
241 * Certain PHYs are connected to compensation resistors and act
242 * as masters to other PHYs.
244 * ICL,TGL:
245 * A(master) -> B(slave), C(slave)
246 * RKL,DG1:
247 * A(master) -> B(slave)
248 * C(master) -> D(slave)
250 * We must set the IREFGEN bit for any PHY acting as a master
251 * to another PHY.
253 if ((IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv)) && phy == PHY_C)
254 return true;
256 return phy == PHY_A;
259 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
260 enum phy phy)
262 bool ret = true;
263 u32 expected_val = 0;
265 if (!icl_combo_phy_enabled(dev_priv, phy))
266 return false;
268 if (INTEL_GEN(dev_priv) >= 12) {
269 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
270 ICL_PORT_TX_DW8_ODCC_CLK_SEL |
271 ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK,
272 ICL_PORT_TX_DW8_ODCC_CLK_SEL |
273 ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2);
275 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_PCS_DW1_LN0(phy),
276 DCC_MODE_SELECT_MASK,
277 DCC_MODE_SELECT_CONTINUOSLY);
280 ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
282 if (phy_is_master(dev_priv, phy)) {
283 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
284 IREFGEN, IREFGEN);
286 if (IS_JSL_EHL(dev_priv)) {
287 if (ehl_vbt_ddi_d_present(dev_priv))
288 expected_val = ICL_PHY_MISC_MUX_DDID;
290 ret &= check_phy_reg(dev_priv, phy, ICL_PHY_MISC(phy),
291 ICL_PHY_MISC_MUX_DDID,
292 expected_val);
296 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_CL_DW5(phy),
297 CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
299 return ret;
302 void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv,
303 enum phy phy, bool is_dsi,
304 int lane_count, bool lane_reversal)
306 u8 lane_mask;
307 u32 val;
309 if (is_dsi) {
310 drm_WARN_ON(&dev_priv->drm, lane_reversal);
312 switch (lane_count) {
313 case 1:
314 lane_mask = PWR_DOWN_LN_3_1_0;
315 break;
316 case 2:
317 lane_mask = PWR_DOWN_LN_3_1;
318 break;
319 case 3:
320 lane_mask = PWR_DOWN_LN_3;
321 break;
322 default:
323 MISSING_CASE(lane_count);
324 fallthrough;
325 case 4:
326 lane_mask = PWR_UP_ALL_LANES;
327 break;
329 } else {
330 switch (lane_count) {
331 case 1:
332 lane_mask = lane_reversal ? PWR_DOWN_LN_2_1_0 :
333 PWR_DOWN_LN_3_2_1;
334 break;
335 case 2:
336 lane_mask = lane_reversal ? PWR_DOWN_LN_1_0 :
337 PWR_DOWN_LN_3_2;
338 break;
339 default:
340 MISSING_CASE(lane_count);
341 fallthrough;
342 case 4:
343 lane_mask = PWR_UP_ALL_LANES;
344 break;
348 val = intel_de_read(dev_priv, ICL_PORT_CL_DW10(phy));
349 val &= ~PWR_DOWN_LN_MASK;
350 val |= lane_mask << PWR_DOWN_LN_SHIFT;
351 intel_de_write(dev_priv, ICL_PORT_CL_DW10(phy), val);
354 static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
356 enum phy phy;
358 for_each_combo_phy(dev_priv, phy) {
359 u32 val;
361 if (icl_combo_phy_verify_state(dev_priv, phy)) {
362 drm_dbg(&dev_priv->drm,
363 "Combo PHY %c already enabled, won't reprogram it.\n",
364 phy_name(phy));
365 continue;
368 if (!has_phy_misc(dev_priv, phy))
369 goto skip_phy_misc;
372 * EHL's combo PHY A can be hooked up to either an external
373 * display (via DDI-D) or an internal display (via DDI-A or
374 * the DSI DPHY). This is a motherboard design decision that
375 * can't be changed on the fly, so initialize the PHY's mux
376 * based on whether our VBT indicates the presence of any
377 * "internal" child devices.
379 val = intel_de_read(dev_priv, ICL_PHY_MISC(phy));
380 if (IS_JSL_EHL(dev_priv) && phy == PHY_A) {
381 val &= ~ICL_PHY_MISC_MUX_DDID;
383 if (ehl_vbt_ddi_d_present(dev_priv))
384 val |= ICL_PHY_MISC_MUX_DDID;
387 val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
388 intel_de_write(dev_priv, ICL_PHY_MISC(phy), val);
390 skip_phy_misc:
391 if (INTEL_GEN(dev_priv) >= 12) {
392 val = intel_de_read(dev_priv, ICL_PORT_TX_DW8_LN0(phy));
393 val &= ~ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK;
394 val |= ICL_PORT_TX_DW8_ODCC_CLK_SEL;
395 val |= ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2;
396 intel_de_write(dev_priv, ICL_PORT_TX_DW8_GRP(phy), val);
398 val = intel_de_read(dev_priv, ICL_PORT_PCS_DW1_LN0(phy));
399 val &= ~DCC_MODE_SELECT_MASK;
400 val |= DCC_MODE_SELECT_CONTINUOSLY;
401 intel_de_write(dev_priv, ICL_PORT_PCS_DW1_GRP(phy), val);
404 cnl_set_procmon_ref_values(dev_priv, phy);
406 if (phy_is_master(dev_priv, phy)) {
407 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW8(phy));
408 val |= IREFGEN;
409 intel_de_write(dev_priv, ICL_PORT_COMP_DW8(phy), val);
412 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy));
413 val |= COMP_INIT;
414 intel_de_write(dev_priv, ICL_PORT_COMP_DW0(phy), val);
416 val = intel_de_read(dev_priv, ICL_PORT_CL_DW5(phy));
417 val |= CL_POWER_DOWN_ENABLE;
418 intel_de_write(dev_priv, ICL_PORT_CL_DW5(phy), val);
422 static void icl_combo_phys_uninit(struct drm_i915_private *dev_priv)
424 enum phy phy;
426 for_each_combo_phy_reverse(dev_priv, phy) {
427 u32 val;
429 if (phy == PHY_A &&
430 !icl_combo_phy_verify_state(dev_priv, phy))
431 drm_warn(&dev_priv->drm,
432 "Combo PHY %c HW state changed unexpectedly\n",
433 phy_name(phy));
435 if (!has_phy_misc(dev_priv, phy))
436 goto skip_phy_misc;
438 val = intel_de_read(dev_priv, ICL_PHY_MISC(phy));
439 val |= ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
440 intel_de_write(dev_priv, ICL_PHY_MISC(phy), val);
442 skip_phy_misc:
443 val = intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy));
444 val &= ~COMP_INIT;
445 intel_de_write(dev_priv, ICL_PORT_COMP_DW0(phy), val);
449 void intel_combo_phy_init(struct drm_i915_private *i915)
451 if (INTEL_GEN(i915) >= 11)
452 icl_combo_phys_init(i915);
453 else if (IS_CANNONLAKE(i915))
454 cnl_combo_phys_init(i915);
457 void intel_combo_phy_uninit(struct drm_i915_private *i915)
459 if (INTEL_GEN(i915) >= 11)
460 icl_combo_phys_uninit(i915);
461 else if (IS_CANNONLAKE(i915))
462 cnl_combo_phys_uninit(i915);