[Intel-gfx] [PATCH] drm/i915/display: Update the DDI_BUF_CTL active timeout for ADL-P

[Gustavo Sousa]

Quoting Ankit Nautiyal (2023-05-05 08:09:17)
>For ADL-P the timeout for DDI_BUF_CTL active is 500usec.
>Update the same as per Bspec:55424.

I think the Bspec number could go as a trailer. We could also add BSpec 49191
here.

Acked-by: Gustavo Sousa <gustavo.sousa at intel.com>

>
>Fixes: 5add4575c298 ("drm/i915/ddi: Align timeout for DDI_BUF_CTL active with Bspec")
>Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
>Cc: Imre Deak <imre.deak at intel.com>
>Cc: Lucas De Marchi <lucas.demarchi at intel.com>
>Cc: <stable at vger.kernel.org> # v6.3+
>
>Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
>---
> drivers/gpu/drm/i915/display/intel_ddi.c | 3 +++
> 1 file changed, 3 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
>index 55f36d9d509c..6d8e4d7a784e 100644
>--- a/drivers/gpu/drm/i915/display/intel_ddi.c
>+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
>@@ -216,8 +216,11 @@ static void intel_wait_ddi_buf_active(struct drm_i915_private *dev_priv,
>        } else if (DISPLAY_VER(dev_priv) >= 12) {
>                if (intel_phy_is_tc(dev_priv, phy))
>                        timeout_us = 3000;
>+          else if (IS_ALDERLAKE_P(dev_priv))
>+                  timeout_us = 500;
>                else
>                        timeout_us = 1000;
>+
>        } else {
>                timeout_us = 500;
>        }
>-- 
>2.25.1
>