From: Vidya Srinivas <vidya.srinivas@intel.com>
Date: Mon, 9 Apr 2018 09:11:09 +0530
Subject: drm/i915: Display WA 827
Git-commit: c4a4efa91737e61b3334642a61659fd64d7e31d6
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Display WA 827 applies to GEN9 (excluede GLK) and CNL.
Switching the plane format from NV12 to RGB and leaving system idle
results in display underrun and corruption.
WA: Set the bit 15 & bit 19 to 1b in the CLKGATE_DIS_PSL
register for the pipe in which NV12 plane is enabled.
v2: Addressed review comments from Maarten and
Juha-Pekka Heikkila. Added reviewed by from
Juha-Pekka Heikkila.
v3: Rebased the series
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
Signed-off-by: Nabendu Maiti <nabendu.bikash.maiti@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-11-git-send-email-vidya.srinivas@intel.com
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_display.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3824,6 +3824,9 @@ enum {
#define _CLKGATE_DIS_PSL_A 0x46520
#define _CLKGATE_DIS_PSL_B 0x46524
#define _CLKGATE_DIS_PSL_C 0x46528
+#define DUPS1_GATING_DIS (1 << 15)
+#define DUPS2_GATING_DIS (1 << 19)
+#define DUPS3_GATING_DIS (1 << 23)
#define DPF_GATING_DIS (1 << 10)
#define DPF_RAM_GATING_DIS (1 << 9)
#define DPFR_GATING_DIS (1 << 8)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -488,6 +488,21 @@ static const struct intel_limit intel_li
.p2 = { .p2_slow = 1, .p2_fast = 20 },
};
+static void
+skl_wa_clkgate(struct drm_i915_private *dev_priv, int pipe, bool enable)
+{
+ if (IS_SKYLAKE(dev_priv))
+ return;
+
+ if (enable)
+ I915_WRITE(CLKGATE_DIS_PSL(pipe),
+ DUPS1_GATING_DIS | DUPS2_GATING_DIS);
+ else
+ I915_WRITE(CLKGATE_DIS_PSL(pipe),
+ I915_READ(CLKGATE_DIS_PSL(pipe)) &
+ ~(DUPS1_GATING_DIS | DUPS2_GATING_DIS));
+}
+
static bool
needs_modeset(const struct drm_crtc_state *state)
{
@@ -5103,6 +5118,8 @@ static bool hsw_post_update_enable_ips(c
static void intel_post_plane_update(struct intel_crtc_state *old_crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
+ struct drm_device *dev = crtc->base.dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
struct drm_atomic_state *old_state = old_crtc_state->base.state;
struct intel_crtc_state *pipe_config =
intel_atomic_get_new_crtc_state(to_intel_atomic_state(old_state),
@@ -5125,6 +5142,7 @@ static void intel_post_plane_update(stru
to_intel_plane(primary));
struct intel_plane_state *old_primary_state =
to_intel_plane_state(old_pri_state);
+ struct drm_framebuffer *fb = primary_state->base.fb;
intel_fbc_post_update(crtc);
@@ -5132,6 +5150,14 @@ static void intel_post_plane_update(stru
(needs_modeset(&pipe_config->base) ||
!old_primary_state->base.visible))
intel_post_enable_primary(&crtc->base, pipe_config);
+
+ /* Display WA 827 */
+ if ((INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv)) ||
+ IS_CANNONLAKE(dev_priv)) {
+ if (fb && fb->format->format == DRM_FORMAT_NV12)
+ skl_wa_clkgate(dev_priv, crtc->pipe, false);
+ }
+
}
}
@@ -5158,6 +5184,14 @@ static void intel_pre_plane_update(struc
to_intel_plane(primary));
struct intel_plane_state *old_primary_state =
to_intel_plane_state(old_pri_state);
+ struct drm_framebuffer *fb = primary_state->base.fb;
+
+ /* Display WA 827 */
+ if ((INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv)) ||
+ IS_CANNONLAKE(dev_priv)) {
+ if (fb && fb->format->format == DRM_FORMAT_NV12)
+ skl_wa_clkgate(dev_priv, crtc->pipe, true);
+ }
intel_fbc_pre_update(crtc, pipe_config, primary_state);
/*