drm/dp: retry AUX transactions 32 times (v1.1)

At least on two MST devices I've tested with, when
they are link training downstream, they are totally
unable to handle aux ch msgs, so they defer like nuts.
I tried 16, it wasn't enough, 32 seems better.

This fixes one Dell 4k monitor and one of the
MST hubs.

v1.1: fixup comment (Tom).

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 959e2074b0d4299c10d45311fbce06c13ab58d0c..79968e39c8d09909395c5ad40165d0062c8227ac 100644 (file)
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -186,10 +186,11 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
 
        /*
         * The specification doesn't give any recommendation on how often to
-        * retry native transactions, so retry 7 times like for I2C-over-AUX
-        * transactions.
+        * retry native transactions. We used to retry 7 times like for
+        * aux i2c transactions but real world devices this wasn't
+        * sufficient, bump to 32 which makes Dell 4k monitors happier.
         */
-       for (retry = 0; retry < 7; retry++) {
+       for (retry = 0; retry < 32; retry++) {
 
                mutex_lock(&aux->hw_mutex);
                err = aux->transfer(aux, &msg);