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authorLyude <cpaul@redhat.com>2015-12-04 02:26:07 +0300
committerAlex Deucher <alexander.deucher@amd.com>2015-12-04 21:09:12 +0300
commitcb5d41664375ad4fbe47bdae745bb6fe8d837e68 (patch)
tree3e449371b88b4f436c00bd3dc2f9dd0969c1ead9 /drivers/gpu/drm/radeon/radeon_mode.h
parent81d75a30c6ed006a314f5c760196d04758660ca6 (diff)
downloadlinux-cb5d41664375ad4fbe47bdae745bb6fe8d837e68.tar.xz
drm/radeon: Retry DDC probing on DVI on failure if we got an HPD interrupt
HPD signals on DVI ports can be fired off before the pins required for DDC probing actually make contact, due to the pins for HPD making contact first. This results in a HPD signal being asserted but DDC probing failing, resulting in hotplugging occasionally failing. This is somewhat rare on most cards (depending on what angle you plug the DVI connector in), but on some cards it happens constantly. The Radeon R5 on the machine used for testing this patch for instance, runs into this issue just about every time I try to hotplug a DVI monitor and as a result hotplugging almost never works. Rescheduling the hotplug work for a second when we run into an HPD signal with a failing DDC probe usually gives enough time for the rest of the connector's pins to make contact, and fixes this issue. Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Lyude <cpaul@redhat.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_mode.h')
-rw-r--r--drivers/gpu/drm/radeon/radeon_mode.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 830e171c3a9e..0fa3e255a545 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -553,6 +553,7 @@ struct radeon_connector {
void *con_priv;
bool dac_load_detect;
bool detected_by_load; /* if the connection status was determined by load */
+ bool detected_hpd_without_ddc; /* if an HPD signal was detected on DVI, but ddc probing failed */
uint16_t connector_object_id;
struct radeon_hpd hpd;
struct radeon_router router;