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@quicinc.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/483563/
Link: https://lore.kernel.org/r/1650995939-28467-2-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 4af281d97493f7f6949a32caabc02e5ac07a5207..1ccb166e3b28c103a8f5571b96ae62b6ff06b0bb 100644 (file)
--- 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;