[PATCH v5] drm/i915/dp: Increase idle pattern wait timeout to 2ms

[Gustavo Sousa]

Quoting Shekhar Chauhan (2024-03-11 01:15:04-03:00)
>The driver currently waits 1ms for idle patterns,
>but for Xe2LPD and possibly future display IPs,
>it requires a 1640us (rounded up to 2ms) timeout
>whilst waiting for idle patterns for MST streams.
>
>To simplify the code, the timeout is uniformly
>increased by 1ms across all platforms/display IPs.
>
>v1: Introduced the 2ms wait timeout.
>v2: Segregated the wait timeout for platforms before & after LNL.
>v3: Fixed 2 cosmetic changes.
>v4: Revert to v2 design with commit message enhancements.
>v5: Minor cosmetic changes to the commit message.
>
>BSpec: 68849
>Signed-off-by: Shekhar Chauhan <shekhar.chauhan at intel.com>

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

>---
> drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
>index bea441590204..05ba3642d486 100644
>--- a/drivers/gpu/drm/i915/display/intel_ddi.c
>+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
>@@ -3680,7 +3680,7 @@ static void intel_ddi_set_idle_link_train(struct intel_dp *intel_dp,
> 
>         if (intel_de_wait_for_set(dev_priv,
>                                   dp_tp_status_reg(encoder, crtc_state),
>-                                  DP_TP_STATUS_IDLE_DONE, 1))
>+                                  DP_TP_STATUS_IDLE_DONE, 2))
>                 drm_err(&dev_priv->drm,
>                         "Timed out waiting for DP idle patterns\n");
> }
>-- 
>2.34.1
>