6.1-stable review patch. If anyone has any objections, please let me know.
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From: Wayne Lin wayne.lin@amd.com
commit 202dc359addab29451d3d18243c3d957da5392c8 upstream.
[Why] Like commit ec5fa9fcdeca ("drm/amd/display: Adjust the MST resume flow"), we want to avoid handling mst topology changes before restoring the old state. If we enable DP_UP_REQ_EN before calling drm_atomic_helper_resume(), have changce to handle CSN event first and fire hotplug event before restoring the cached state.
[How] Disable mst branch sending up request event before we restoring the cached state. DP_UP_REQ_EN will be set later when we call drm_dp_mst_topology_mgr_resume().
Cc: Mario Limonciello mario.limonciello@amd.com Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Reviewed-by: Hersen Wu hersenxs.wu@amd.com Signed-off-by: Wayne Lin wayne.lin@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2363,7 +2363,6 @@ static void resume_mst_branch_status(str
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, DP_MST_EN | - DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); if (ret < 0) { drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n");