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Date: Mon, 30 May 2022 10:57:12 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Hsin-Yi Wang <hsinyi@...omium.org>,
dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org
Cc: Rob Clark <robdclark@...omium.org>,
Stephen Boyd <swboyd@...omium.org>,
Douglas Anderson <dianders@...omium.org>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Sean Paul <sean@...rly.run>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
Simon Ser <contact@...rsion.fr>,
Harry Wentland <harry.wentland@....com>,
Alex Deucher <alexander.deucher@....com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Emil Velikov <emil.l.velikov@...il.com>
Subject: Re: [PATCH v10 1/4] gpu: drm: separate panel orientation property
creating and value setting
Hi,
On 5/30/22 10:19, 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.
>
> 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@...omium.org>
> Reviewed-by: Sean Paul <seanpaul@...omium.org>
> ---
> v9->v10: rebase to latest linux-next.
> v9: https://patchwork.kernel.org/project/linux-mediatek/patch/20220318074825.3359978-2-hsinyi@chromium.org/
> v8: https://patchwork.kernel.org/project/linux-mediatek/patch/20220208084234.1684930-1-hsinyi@chromium.org/
> v7: https://patchwork.kernel.org/project/linux-mediatek/patch/20220208073714.1540390-1-hsinyi@chromium.org/
> ---
> drivers/gpu/drm/drm_connector.c | 58 +++++++++++++++++++++++++--------
> include/drm/drm_connector.h | 2 ++
> 2 files changed, 47 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 1c48d162c77e..d68cc78f6684 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -1252,7 +1252,7 @@ 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()
> *
> @@ -2310,8 +2310,8 @@ 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 try to create one.
> *
> * 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
> @@ -2343,18 +2343,13 @@ int drm_connector_set_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)
> + if (drm_connector_init_panel_orientation_property(connector) < 0)
> return -ENOMEM;
> -
> - dev->mode_config.panel_orientation_property = prop;
> + prop = dev->mode_config.panel_orientation_property;
> }
>
> - 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);
> @@ -2362,7 +2357,7 @@ 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
> @@ -2389,6 +2384,43 @@ 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;
> +
> + if(dev->mode_config.panel_orientation_property)
> + return 0;
> +
> + 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);
DRM_MODE_PANEL_ORIENTATION_UNKNOWN is -1 which is not a valid value
for an enum. IOW when the panel-orientation is DRM_MODE_PANEL_ORIENTATION_UNKNOWN
then the property should not be created on the drm-connector object at all.
Which brings us back to what I said in reply to the coverletter,
it seems that you have a probe ordering problem here; and fixing that
issue would make this patch-set unnecessary.
Regards,
Hans
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
> +
> static const struct drm_prop_enum_list privacy_screen_enum[] = {
> { PRIVACY_SCREEN_DISABLED, "Disabled" },
> { PRIVACY_SCREEN_ENABLED, "Enabled" },
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 3ac4bf87f257..f0681091c617 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1802,6 +1802,8 @@ 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);
> int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
> int min, int max);
> void drm_connector_create_privacy_screen_properties(struct drm_connector *conn);
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