From 9cdef4f720376ef0fb0febce1ed2377c19e531f9 Mon Sep 17 00:00:00 2001 From: Wayne Lin Date: Mon, 4 Dec 2023 10:09:33 +0800 Subject: drm/amd/display: pbn_div need be updated for hotplug event link_rate sometime will be changed when DP MST connector hotplug, so pbn_div also need be updated; otherwise, it will mismatch with link_rate, causes no output in external monitor. This is a backport to 6.7 and older. Cc: stable@vger.kernel.org Tested-by: Daniel Wheeler Reviewed-by: Jerry Zuo Acked-by: Rodrigo Siqueira Signed-off-by: Wade Wang Signed-off-by: Wayne Lin Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index c8c00c2a5224..19fabaec9408 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -6914,8 +6914,7 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder, if (IS_ERR(mst_state)) return PTR_ERR(mst_state); - if (!mst_state->pbn_div) - mst_state->pbn_div = dm_mst_get_pbn_divider(aconnector->mst_root->dc_link); + mst_state->pbn_div = dm_mst_get_pbn_divider(aconnector->mst_root->dc_link); if (!state->duplicated) { int max_bpc = conn_state->max_requested_bpc; -- cgit v1.2.3