drm/i915: Display WA 827
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
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 057f3cf..466d247 100644
--- 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_limits_bxt = {
.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(const struct intel_crtc_state *old_crtc_s
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(struct intel_crtc_state *old_crtc_state)
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(struct intel_crtc_state *old_crtc_state)
(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(struct intel_crtc_state *old_crtc_state,
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);
/*