Hi,
Adding random latency is not a right solution for any flicker.
This will affect the configuration which can be supported in all other
platforms.
There are many unanswered questions here:
Which customer? which platform? changes & root-cause of the issue?
Please find what are the changes in customer board & according to
root-cause of issue add WA with proper reasoning & only for affected
platforms.
-Mahesh
On Tuesday 22 August 2017 05:06 PM, Lee, Shawn C wrote:
From: "Lee, Shawn C" <shawn.c.lee@xxxxxxxxx>
LFP flicker with latest drm-nightly on customer board. After increase
latency value and this symptom can't be reproduced.
TEST=Reboot DUT and no flicking on LFP.
Cc: Kumar, Mahesh <mahesh1.kumar@xxxxxxxxx>
Cc: Gary C Wang <gary.c.wang@xxxxxxxxx>
Signed-off-by: Shawn Lee <shawn.c.lee@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e7ab17d38680..2faea497e00c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4410,7 +4410,7 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
latency += 4;
if (apply_memory_bw_wa && x_tiled)
- latency += 15;
+ latency += 60;
if (plane->id == PLANE_CURSOR) {
width = intel_pstate->base.crtc_w;
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