linux-kernel - [PATCH 5.19 001/155] drm/msm/dp: make eDP panel as the first connected connector

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Date:   Tue,  6 Sep 2022 15:29:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Douglas Anderson <dianders@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 001/155] drm/msm/dp: make eDP panel as the first connected connector

From: Kuogee Hsieh <quic_khsieh@...cinc.com>

[ Upstream commit deffa2d75db7e7a9a1fe3dad4f99310bff7b6449 ]

Some userspace presumes that the first connected connector is the main
display, where it's supposed to display e.g. the login screen. For
laptops, this should be the main panel.

This patch call drm_helper_move_panel_connectors_to_head() after
drm_bridge_connector_init() to make sure eDP stay at head of
connected connector list. This fixes unexpected corruption happen
at eDP panel if eDP is not placed at head of connected connector
list.

Changes in v2:
-- move drm_helper_move_panel_connectors_to_head() to
		dpu_kms_drm_obj_init()

Changes in v4:
-- move drm_helper_move_panel_connectors_to_head() to msm_drm_init()

Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Tested-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Fixes: ef7837ff091c ("drm/msm/dp: Add DP controllers for sc7280")
Patchwork: https://patchwork.freedesktop.org/patch/492581/
Link: https://lore.kernel.org/r/1657135928-31195-1-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 14ab9a627d8b0..7c0314d6566af 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -424,6 +424,8 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		}
 	}
 
+	drm_helper_move_panel_connectors_to_head(ddev);
+
 	ddev->mode_config.funcs = &mode_config_funcs;
 	ddev->mode_config.helper_private = &mode_config_helper_funcs;
 
-- 
2.35.1