1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2023 Intel Corporation
4 */
5
6#include <drm/drm_print.h>
7
8#include "i915_reg.h"
9#include "intel_de.h"
10#include "intel_display_core.h"
11#include "intel_display_regs.h"
12#include "intel_display_wa.h"
13
14static void gen11_display_wa_apply(struct intel_display *display)
15{
16 /* Wa_14010594013 */
17 intel_de_rmw(display, GEN8_CHICKEN_DCPR_1, clear: 0, ICL_DELAY_PMRSP);
18}
19
20static void xe_d_display_wa_apply(struct intel_display *display)
21{
22 /* Wa_14013723622 */
23 intel_de_rmw(display, CLKREQ_POLICY, CLKREQ_POLICY_MEM_UP_OVRD, set: 0);
24}
25
26static void adlp_display_wa_apply(struct intel_display *display)
27{
28 /* Wa_22011091694:adlp */
29 intel_de_rmw(display, GEN9_CLKGATE_DIS_5, clear: 0, DPCE_GATING_DIS);
30
31 /* Bspec/49189 Initialize Sequence */
32 intel_de_rmw(display, GEN8_CHICKEN_DCPR_1, DDI_CLOCK_REG_ACCESS, set: 0);
33}
34
35void intel_display_wa_apply(struct intel_display *display)
36{
37 if (display->platform.alderlake_p)
38 adlp_display_wa_apply(display);
39 else if (DISPLAY_VER(display) == 12)
40 xe_d_display_wa_apply(display);
41 else if (DISPLAY_VER(display) == 11)
42 gen11_display_wa_apply(display);
43}
44
45/*
46 * Wa_16025573575:
47 * Fixes: Issue with bitbashing on Xe3 based platforms.
48 * Workaround: Set masks bits in GPIO CTL and preserve it during bitbashing sequence.
49 */
50static bool intel_display_needs_wa_16025573575(struct intel_display *display)
51{
52 return DISPLAY_VERx100(display) == 3000 || DISPLAY_VERx100(display) == 3002 ||
53 DISPLAY_VERx100(display) == 3500;
54}
55
56/*
57 * Wa_14011503117:
58 * Fixes: Before enabling the scaler DE fatal error is masked
59 * Workaround: Unmask the DE fatal error register after enabling the scaler
60 * and after waiting of at least 1 frame.
61 */
62bool __intel_display_wa(struct intel_display *display, enum intel_display_wa wa, const char *name)
63{
64 switch (wa) {
65 case INTEL_DISPLAY_WA_16023588340:
66 return intel_display_needs_wa_16023588340(display);
67 case INTEL_DISPLAY_WA_16025573575:
68 return intel_display_needs_wa_16025573575(display);
69 case INTEL_DISPLAY_WA_14011503117:
70 return DISPLAY_VER(display) == 13;
71 case INTEL_DISPLAY_WA_22014263786:
72 return IS_DISPLAY_VERx100(display, 1100, 1400);
73 default:
74 drm_WARN(display->drm, 1, "Missing Wa number: %s\n", name);
75 break;
76 }
77
78 return false;
79}
80

source code of linux/drivers/gpu/drm/i915/display/intel_display_wa.c