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drm/amd/display: Remove incorrect checking in dmub aux handler

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commit 396dc51b3b7ea524bf8061f478332d0039e96d5d upstream.

[Why & How]
"Request length != reply length" is expected behavior defined in spec.
It's not an invalid reply. Besides, replied data handling logic is not
designed to be written in amdgpu_dm_process_dmub_aux_transfer_sync().
Remove the incorrectly handling section.

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 81b5c6fa62af62fe89ae9576f41aae37830b94cb)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wayne Lin 2025-04-20 16:56:54 +08:00 committed by Greg Kroah-Hartman
parent f3385a056a
commit 2cca631283
1 changed files with 1 additions and 11 deletions
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12
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -10708,19 +10708,9 @@ int amdgpu_dm_process_dmub_aux_transfer_sync(
payload->reply[0] = (adev->dm.dmub_notify->aux_reply.command >> 4) & 0xF;
if (!payload->write && p_notify->aux_reply.length &&
(payload->reply[0] == AUX_TRANSACTION_REPLY_AUX_ACK)) {
if (payload->length != p_notify->aux_reply.length) {
DRM_WARN("invalid read length %d from DPIA AUX 0x%x(%d)!\n",
p_notify->aux_reply.length,
payload->address, payload->length);
*operation_result = AUX_RET_ERROR_INVALID_REPLY;
goto out;
}
(payload->reply[0] == AUX_TRANSACTION_REPLY_AUX_ACK))
memcpy(payload->data, p_notify->aux_reply.data,
p_notify->aux_reply.length);
}
/* success */
ret = p_notify->aux_reply.length;