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drm/amd/display: Shift DMUB AUX reply command if necessary

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[Why]
Defined value of dmub AUX reply command field get updated but didn't
adjust dm receiving side accordingly.

[How]
Check the received reply command value to see if it's updated version
or not. Adjust it if necessary.

Fixes: ead08b95fa ("drm/amd/display: Fix race condition in DPIA AUX transfer")
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit d5c9ade755)
Cc: stable@vger.kernel.org
This commit is contained in:
Wayne Lin
2025-04-18 16:31:59 +08:00
committed by Alex Deucher
parent eba692ca3a
commit 5a3846648c
1 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@@ -12758,8 +12758,11 @@ int amdgpu_dm_process_dmub_aux_transfer_sync(
goto out;
}
payload->reply[0] = adev->dm.dmub_notify->aux_reply.command & 0xF;
if (adev->dm.dmub_notify->aux_reply.command & 0xF0)
/* The reply is stored in the top nibble of the command. */
payload->reply[0] = (adev->dm.dmub_notify->aux_reply.command >> 4) & 0xF;
payload->reply[0] = adev->dm.dmub_notify->aux_reply.command;
if (!payload->write && p_notify->aux_reply.length &&
(payload->reply[0] == AUX_TRANSACTION_REPLY_AUX_ACK)) {