[PATCH 1/9] drm: Do not call drm_dp_cec_set_edid() while registering DP connectors

José Roberto de Souza jose.souza at intel.com
Wed Sep 26 21:52:09 UTC 2018

drm_dp_cec_register_connector() is called when registering each DP
connector in DRM, while sounds a good idea register CEC adapters as
earlier as possible, it causes some driver initialization delay
trying to do DPCD transactions in disconnected connectors.

This change will cause no regressions as drm_dp_cec_set_edid() will
still be called in further detection of connected connectors with a
valid edid parameter.

This change reduced the module load of i915 by average 0.5sec in a
machine with just one DP port disconnected while reducing more than
3sec in a machine with 4 DP ports disconnected.

Cc: Hans Verkuil <hans.verkuil at cisco.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
 drivers/gpu/drm/drm_dp_cec.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
index 8a718f85079a..b15cee85b702 100644
--- a/drivers/gpu/drm/drm_dp_cec.c
+++ b/drivers/gpu/drm/drm_dp_cec.c
@@ -424,8 +424,6 @@ void drm_dp_cec_register_connector(struct drm_dp_aux *aux, const char *name,
 	aux->cec.parent = parent;
-	drm_dp_cec_set_edid(aux, NULL);

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