The Bspec sequence expects us to poll for DDI Idle status to be 0 (not idle) with a timeout of 600usecs after enabling the DDI BUF CTL. But currently in the driver we just wait for 600usecs without polling so add that. Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Cc: Imre Deak <imre.deak@xxxxxxxxx> Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_ddi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index ca7bb2294d2b..de7e15de0bc5 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4023,7 +4023,11 @@ 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); + if (wait_for_us(!(intel_de_read(dev_priv, DDI_BUF_CTL(port)) & + DDI_BUF_IS_IDLE), + 600)) + drm_err(&dev_priv->drm, "DDI port:%c buffer idle\n", + port_name(port)); } static void intel_ddi_set_link_train(struct intel_dp *intel_dp, -- 2.19.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
