On 06/07/2022 20:54, Kuogee Hsieh wrote:
On 7/6/2022 10:41 AM, Dmitry Baryshkov wrote:
On 06/07/2022 20:38, Kuogee Hsieh wrote:
On 7/6/2022 10:25 AM, Dmitry Baryshkov wrote:
On 06/07/2022 20:24, Kuogee Hsieh wrote:
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()
Signed-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 2b9d931..50ff666 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -763,6 +763,8 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms
*dpu_kms)
if (ret)
return ret;
+ drm_helper_move_panel_connectors_to_head(dev);
This should be in msm_drv.c unless you have a strong reason to have
it here.
Can you please provide more info why should be in msm_drv.c?
Let me quote my message from v1 review:
Please move this call to the msm_drm_init(). Calling this function
somewhere after the ->kms_init() would make sure that all panel
connectors are close to the top of the list, whichever MDP/DPU driver
is used and whichever actual interface is bound to this panel.
Below are the call flow in timing order, ->kms_init does not create
connectors/interfaces, hw_init does that.
1) ->kms_init
2) ->hw_init -> dpu_kms_hw_init --> _dpu_kms_drm_obj_init() -->
_dpu_kms_setup_displays()--> msm_dp_modeset_init() --> creator
connectors/interfaces
3) drm_helper_move_panel_connectors_to_head() <== add here??
Yes.
_dpu_kms_drm_obj_init() create and initialize drm obj one by one and
_dpu_kms_setup_displays() had created system wide
connectors/interfaces .
After that should be fine to move edp to head of connector list.
+
num_encoders = 0;
drm_for_each_encoder(encoder, dev)
num_encoders++;
--
With best wishes
Dmitry
