Re: [PATCH v6 RESEND 1/3] gpu: drm: separate panel orientation property creating and value setting

From: Enric Balletbo Serra
Date: Thu Jul 15 2021 - 05:55:36 EST

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Hi Hsin-Yi,

Thank you for your patch.

Missatge de Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> del dia dj., 24 de juny
2021 a les 12:55:
>
> 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.
>

In fact, results with the following warning

> Add a function to create panel orientation property and set default value
> to UNKNOWN, so drivers can call this function to init the property earlier
> , and 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>
> Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>

And that patch fixes the problem, apart from, not being an expert, but
the change looks reasonable to me, there is already some reviewed tags
and I'm not sure I am the appropriate to review it but I can

Tested-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>

As together with the other two patches works and I don't see any
problem on the Lenovo IdeaPad Duet.

> ---
> drivers/gpu/drm/drm_connector.c | 58 ++++++++++++++++++-------
> drivers/gpu/drm/i915/display/icl_dsi.c | 1 +
> drivers/gpu/drm/i915/display/intel_dp.c | 1 +
> drivers/gpu/drm/i915/display/vlv_dsi.c | 1 +
> include/drm/drm_connector.h | 2 +
> 5 files changed, 47 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 7631f76e7f345..7189baaabf416 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -1210,7 +1210,7 @@ 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()
> *
> @@ -2173,8 +2173,8 @@ EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
> * @connector: connector for which to set the panel-orientation property.
> * @panel_orientation: drm_panel_orientation value to set
> *
> - * This function sets the connector's panel_orientation and attaches
> - * a "panel orientation" property to the connector.
> + * This function sets the connector's panel_orientation value. If the property
> + * doesn't exist, it will return an error.
> *
> * Calling this function on a connector where the panel_orientation has
> * already been set is a no-op (e.g. the orientation has been overridden with
> @@ -2205,19 +2205,11 @@ 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;
> - }
> + if (WARN_ON(!prop))
> + return -EINVAL;
>
> - 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);
> @@ -2225,7 +2217,7 @@ EXPORT_SYMBOL(drm_connector_set_panel_orientation);
> /**
> * drm_connector_set_panel_orientation_with_quirk -
> * set the connector's panel_orientation after checking for quirks
> - * @connector: connector for which to init the panel-orientation property.
> + * @connector: connector for which to set the panel-orientation property.
> * @panel_orientation: drm_panel_orientation value to set
> * @width: width in pixels of the panel, used for panel quirk detection
> * @height: height in pixels of the panel, used for panel quirk detection
> @@ -2252,6 +2244,40 @@ int drm_connector_set_panel_orientation_with_quirk(
> }
> EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);
>
> +/**
> + * drm_connector_init_panel_orientation_property -
> + * create the connector's panel orientation property
> + *
> + * This function attaches a "panel orientation" property to the connector
> + * and initializes its value to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
> + *
> + * The value of the property can be set by drm_connector_set_panel_orientation()
> + * or drm_connector_set_panel_orientation_with_quirk() later.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_connector_init_panel_orientation_property(
> + struct drm_connector *connector)
> +{
> + struct drm_device *dev = connector->dev;
> + struct drm_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;
> + drm_object_attach_property(&connector->base, prop,
> + DRM_MODE_PANEL_ORIENTATION_UNKNOWN);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
> +
> int drm_connector_set_obj_prop(struct drm_mode_object *obj,
> struct drm_property *property,
> uint64_t value)
> diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
> index 9282978060b08..5ac4538e42833 100644
> --- a/drivers/gpu/drm/i915/display/icl_dsi.c
> +++ b/drivers/gpu/drm/i915/display/icl_dsi.c
> @@ -1903,6 +1903,7 @@ static void icl_dsi_add_properties(struct intel_connector *connector)
>
> connector->base.state->scaling_mode = DRM_MODE_SCALE_ASPECT;
>
> + drm_connector_init_panel_orientation_property(&connector->base);
> drm_connector_set_panel_orientation_with_quirk(&connector->base,
> intel_dsi_get_panel_orientation(connector),
> connector->panel.fixed_mode->hdisplay,
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index a5231ac3443aa..f1d664e5abb28 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -5263,6 +5263,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> intel_panel_setup_backlight(connector, pipe);
>
> if (fixed_mode) {
> + drm_connector_init_panel_orientation_property(connector);
> drm_connector_set_panel_orientation_with_quirk(connector,
> dev_priv->vbt.orientation,
> fixed_mode->hdisplay, fixed_mode->vdisplay);
> diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
> index 9bee99fe54954..853855482af14 100644
> --- a/drivers/gpu/drm/i915/display/vlv_dsi.c
> +++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
> @@ -1632,6 +1632,7 @@ static void vlv_dsi_add_properties(struct intel_connector *connector)
>
> connector->base.state->scaling_mode = DRM_MODE_SCALE_ASPECT;
>
> + drm_connector_init_panel_orientation_property(&connector->base);
> drm_connector_set_panel_orientation_with_quirk(
> &connector->base,
> intel_dsi_get_panel_orientation(connector),
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 1922b278ffadf..4396c1c4a5dbc 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1696,6 +1696,8 @@ int drm_connector_set_panel_orientation_with_quirk(
> struct drm_connector *connector,
> enum drm_panel_orientation panel_orientation,
> int width, int height);
> +int drm_connector_init_panel_orientation_property(
> + struct drm_connector *connector);

nit: this could be probably in one line

> int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
> int min, int max);
>
> --
> 2.32.0.288.g62a8d224e6-goog
>

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