mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 22:56:39 +07:00
drm/radeon: fix DP link training issue with second 4K monitor
There is an issue observed when we hotplug a second DP 4K monitor to the system. Sometimes, the link training fails for the second monitor after HPD interrupt generation. The issue happens when some queued or deferred transactions are already present on the AUX channel when we initiate a new transcation to (say) get DPCD or during link training. We set AUX_IGNORE_HPD_DISCON bit in the AUX_CONTROL register so that we can ignore any such deferred transactions when a new AUX transaction is initiated. Signed-off-by: Arindam Nath <arindam.nath@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
This commit is contained in:
parent
fca097169f
commit
1a738347df
@ -105,7 +105,7 @@ radeon_dp_aux_transfer_native(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg
|
||||
|
||||
tmp &= AUX_HPD_SEL(0x7);
|
||||
tmp |= AUX_HPD_SEL(chan->rec.hpd);
|
||||
tmp |= AUX_EN | AUX_LS_READ_EN;
|
||||
tmp |= AUX_EN | AUX_LS_READ_EN | AUX_HPD_DISCON(0x1);
|
||||
|
||||
WREG32(AUX_CONTROL + aux_offset[instance], tmp);
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user