[PATCH v4] drm/i915/dp: Increase idle pattern wait timeout to 2ms

[Shekhar Chauhan <shekhar.chauhan@intel.com>]

The driver currently waits 1ms for idle patterns,
but for LNL and later platforms, 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.

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.

BSpec: 68849
Signed-off-by: Shekhar Chauhan <shekhar.chauhan@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