Re: [PATCH v2 1/2] gpu: drm: init set panel orientation property earlier

From: Hsin-Yi Wang
Date: Tue Apr 27 2021 - 00:55:17 EST

On Mon, Apr 26, 2021 at 11:33 PM Ville Syrjälä
<ville.syrjala@xxxxxxxxxxxxxxx> wrote:
>
> On Mon, Apr 26, 2021 at 01:18:47PM +0800, Hsin-Yi Wang 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.
> >
> > Create panel orientation property in drm_connector_init()
> > and set default value to UNKNOWN. Let the panel set the real value
> > later.
> >
> > [ 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@xxxxxxxxxxxx>
> > ---
> > v1:
> > https://patchwork.kernel.org/project/linux-mediatek/patch/20210409045314.3420733-1-hsinyi@xxxxxxxxxxxx/
> > ---
> > drivers/gpu/drm/drm_connector.c | 28 +++++++++++++++-------------
> > 1 file changed, 15 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> > index 7631f76e7f34..a1acb4af0ef4 100644
> > --- a/drivers/gpu/drm/drm_connector.c
> > +++ b/drivers/gpu/drm/drm_connector.c
> > @@ -303,6 +303,10 @@ int drm_connector_init(struct drm_device *dev,
> > config->tile_property,
> > 0);
> >
> > + drm_object_attach_property(&connector->base,
> > + config->panel_orientation_property,
> > + DRM_MODE_PANEL_ORIENTATION_UNKNOWN);
> > +
>
> A bit silly to add this to every connector. I think you should just
> fix the driver/bridge stuff to set up the orientaion earlier.
>

v3 is sent: https://patchwork.kernel.org/project/linux-mediatek/patch/20210427044948.12596-1-hsinyi@xxxxxxxxxxxx/
Create a function to init this property so that drivers can call this
after connector init. Panel can set the value later.

> > if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
> > drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
> > }
> > @@ -1210,7 +1214,7 @@ static const struct drm_prop_enum_list dp_colorspaces[] = {
> > * INPUT_PROP_DIRECT) will still map 1:1 to the actual LCD panel
> > * coordinates, so if userspace rotates the picture to adjust for
> > * the orientation it must also apply the same transformation to the
> > - * touchscreen input coordinates. This property is initialized by calling
> > + * touchscreen input coordinates. This property value is set by calling
> > * drm_connector_set_panel_orientation() or
> > * drm_connector_set_panel_orientation_with_quirk()
> > *
> > @@ -1298,6 +1302,14 @@ int drm_connector_create_standard_properties(struct drm_device *dev)
> > return -ENOMEM;
> > dev->mode_config.hdr_output_metadata_property = prop;
> >
> > + prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> > + "panel orientation",
> > + drm_panel_orientation_enum_list,
> > + ARRAY_SIZE(drm_panel_orientation_enum_list));
> > + if (!prop)
> > + return -ENOMEM;
> > + dev->mode_config.panel_orientation_property = prop;
> > +
> > return 0;
> > }
> >
> > @@ -2205,19 +2217,9 @@ int drm_connector_set_panel_orientation(
> > info->panel_orientation = panel_orientation;
> >
> > prop = dev->mode_config.panel_orientation_property;
> > - if (!prop) {
> > - prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> > - "panel orientation",
> > - drm_panel_orientation_enum_list,
> > - ARRAY_SIZE(drm_panel_orientation_enum_list));
> > - if (!prop)
> > - return -ENOMEM;
> > -
> > - dev->mode_config.panel_orientation_property = prop;
> > - }
> >
> > - drm_object_attach_property(&connector->base, prop,
> > - info->panel_orientation);
> > + drm_object_property_set_value(&connector->base, prop,
> > + info->panel_orientation);
> > return 0;
> > }
> > EXPORT_SYMBOL(drm_connector_set_panel_orientation);
> > --
> > 2.31.1.498.g6c1eba8ee3d-goog
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Ville Syrjälä
> Intel