On Wed, Apr 21, 2021 at 7:47 AM Chun-Kuang Hu chunkuang.hu@kernel.org wrote:
Hi, Hsin-Yi:
Hsin-Yi Wang hsinyi@chromium.org 於 2021年4月20日 週二 下午5:05寫道：
On Fri, Apr 9, 2021 at 12:53 PM Hsin-Yi Wang hsinyi@chromium.org wrote:
drm_dev_register() sets connector->registration_state to DRM_CONNECTOR_REGISTERED and dev->registered to true. If drm_connector_set_panel_orientation() is first called after drm_dev_register(), it will fail several checks and results in following warning. So set panel orientation in dsi before drm_dev_register() is called.
All connector would have this problem, so I would like to fix this in common code. In drm_connector_init(), you could add "panel orientation" property with value DRM_MODE_PANEL_ORIENTATION_UNKNOWN, so it would not add new object when get modes.
Hi CK,
Calling drm_connector_set_panel_orientation() with DRM_MODE_PANEL_ORIENTATION_UNKNOWN will be a no-op. And once the orientation is set, the 2nd call to this is also no-op. https://elixir.bootlin.com/linux/v5.12-rc8/source/drivers/gpu/drm/drm_connec...
The 1st time call to drm_connector_set_panel_orientation() has to be prior than drm_dev_register().
Orientation is an optional property, and different dsi has different ways to read and handle this. Eg. vlv_dsi[1], intel_dp[2], so I think it's better to let each connector decide how to handle orientation.
[1] https://elixir.bootlin.com/linux/v5.12-rc8/source/drivers/gpu/drm/i915/displ... [2] https://elixir.bootlin.com/linux/v5.12-rc8/source/drivers/gpu/drm/i915/displ...
Thanks
Regards, Chun-Kuang.
[ 4.480976] ------------[ cut here ]------------ [ 4.485603] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xb4/0xbc
<snip> [ 4.609772] Call trace: [ 4.612208] __drm_mode_object_add+0xb4/0xbc [ 4.616466] drm_mode_object_add+0x20/0x2c [ 4.620552] drm_property_create+0xdc/0x174 [ 4.624723] drm_property_create_enum+0x34/0x98 [ 4.629241] drm_connector_set_panel_orientation+0x64/0xa0 [ 4.634716] boe_panel_get_modes+0x88/0xd8 [ 4.638802] drm_panel_get_modes+0x2c/0x48 [ 4.642887] panel_bridge_get_modes+0x1c/0x28 [ 4.647233] drm_bridge_connector_get_modes+0xa0/0xd4 [ 4.652273] drm_helper_probe_single_connector_modes+0x218/0x700 [ 4.658266] drm_mode_getconnector+0x1b4/0x45c [ 4.662699] drm_ioctl_kernel+0xac/0x128 [ 4.666611] drm_ioctl+0x268/0x410 [ 4.670002] drm_compat_ioctl+0xdc/0xf0 [ 4.673829] __arm64_compat_sys_ioctl+0xc8/0x100 [ 4.678436] el0_svc_common+0xf4/0x1c0 [ 4.682174] do_el0_svc_compat+0x28/0x3c [ 4.686088] el0_svc_compat+0x10/0x1c [ 4.689738] el0_sync_compat_handler+0xa8/0xcc [ 4.694171] el0_sync_compat+0x178/0x180 [ 4.698082] ---[ end trace b4f2db9d9c88610b ]--- [ 4.702721] ------------[ cut here ]------------ [ 4.707329] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:243 drm_object_attach_property+0x48/0xb8 <snip> [ 4.833830] Call trace: [ 4.836266] drm_object_attach_property+0x48/0xb8 [ 4.840958] drm_connector_set_panel_orientation+0x84/0xa0 [ 4.846432] boe_panel_get_modes+0x88/0xd8 [ 4.850516] drm_panel_get_modes+0x2c/0x48 [ 4.854600] panel_bridge_get_modes+0x1c/0x28 [ 4.858946] drm_bridge_connector_get_modes+0xa0/0xd4 [ 4.863984] drm_helper_probe_single_connector_modes+0x218/0x700 [ 4.869978] drm_mode_getconnector+0x1b4/0x45c [ 4.874410] drm_ioctl_kernel+0xac/0x128 [ 4.878320] drm_ioctl+0x268/0x410 [ 4.881711] drm_compat_ioctl+0xdc/0xf0 [ 4.885536] __arm64_compat_sys_ioctl+0xc8/0x100 [ 4.890142] el0_svc_common+0xf4/0x1c0 [ 4.893879] do_el0_svc_compat+0x28/0x3c [ 4.897791] el0_svc_compat+0x10/0x1c [ 4.901441] el0_sync_compat_handler+0xa8/0xcc [ 4.905873] el0_sync_compat+0x178/0x180 [ 4.909783] ---[ end trace b4f2db9d9c88610c ]---
Signed-off-by: Hsin-Yi Wang hsinyi@chromium.org
ping on the thread, thanks.
drivers/gpu/drm/mediatek/mtk_dsi.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index ae403c67cbd9..45a702ee09f3 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -205,6 +205,7 @@ struct mtk_dsi { u32 irq_data; wait_queue_head_t irq_wait_queue; const struct mtk_dsi_driver_data *driver_data;
enum drm_panel_orientation orientation;};
static inline struct mtk_dsi *bridge_to_dsi(struct drm_bridge *b) @@ -966,6 +967,8 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi) } drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
drm_connector_set_panel_orientation(dsi->connector, dsi->orientation);return 0;err_cleanup_encoder: @@ -1029,6 +1032,12 @@ static int mtk_dsi_probe(struct platform_device *pdev) ret = PTR_ERR(dsi->next_bridge); goto err_unregister_host; }
ret = of_drm_get_panel_orientation(panel->dev->of_node, &dsi->orientation);if (ret) {dev_err(dev, "failed to get panel orientation %d\n", ret);return ret;} } dsi->driver_data = of_device_get_match_data(dev);-- 2.31.1.295.g9ea45b61b8-goog