[Intel-gfx] [PATCH v2 2/2] drm/i915/dp: Wait or poll with timeout for DDI BUF non idle after enable

[Manasi Navare]

Based on the platform, Bspec expects us to wait or poll with
timeout for DDI BUF IDLE bit to be set to 0 (non idle)
afetr enabling DDI_BUF_CTL. Use the existing wait_for_buf_idle()
to do this.

v2:
* Based on platform, fixed delay or poll (Ville)
* Use a helper to do this (Imre, Ville)

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare 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 e4738c3b6d44..788c2be8fa73 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4031,7 +4031,7 @@ static void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp)
 	intel_de_write(dev_priv, DDI_BUF_CTL(port), intel_dp->DP);
 	intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
 
-	udelay(600);
+	intel_wait_ddi_buf_idle(dev_priv, port, false);
 }
 
 static void intel_ddi_set_link_train(struct intel_dp *intel_dp,
-- 
2.19.1