This is a note to let you know that I've just added the patch titled drm/msm/dp: reset DP controller before transmit phy test pattern to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-msm-dp-reset-dp-controller-before-transmit-phy-t.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit b56a8ef17ce5ec0664e35040967cf4af3ef4e36c Author: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx> Date: Tue Apr 26 10:58:58 2022 -0700 drm/msm/dp: reset DP controller before transmit phy test pattern [ Upstream commit 581d69981159b00f0443d171a4b900089f34ccfe ] DP controller state can not switch from video ready state to transmit phy pattern state at run time. DP mainlink has to be teared down followed by reset controller to default state to have DP controller switch to transmit phy test pattern state and start generate specified phy test pattern to sinker once main link setup again. Changes in v2: -- correct Fixes's commit id Fixes: 52352fe2f866 ("drm/msm/dp: use dp_ctrl_off_link_stream during PHY compliance test run") Signed-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx> Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> Patchwork: https://patchwork.freedesktop.org/patch/483563/ Link: https://lore.kernel.org/r/1650995939-28467-2-git-send-email-quic_khsieh@xxxxxxxxxxx Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index 4af281d97493..1ccb166e3b28 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1515,7 +1515,7 @@ static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl) * running. Add the global reset just before disabling the * link clocks and core clocks. */ - ret = dp_ctrl_off_link_stream(&ctrl->dp_ctrl); + ret = dp_ctrl_off(&ctrl->dp_ctrl); if (ret) { DRM_ERROR("failed to disable DP controller\n"); return ret;