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From:   Hsin-Yi Wang <hsinyi@chromium.org>
Date:   Tue, 18 May 2021 12:32:42 +0800
Message-ID: <CAJMQK-jMNNb9+yo+cniMnEdedw=ko=g001q5BbHj_22uTuLmTg@mail.gmail.com>
Subject: Re: [PATCH v6 1/3] gpu: drm: separate panel orientation property
 creating and value setting
To:     dri-devel <dri-devel@lists.freedesktop.org>
Cc:     Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        Sean Paul <sean@poorly.run>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        lkml <linux-kernel@vger.kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Devicetree List <devicetree@vger.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>
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On Thu, Apr 29, 2021 at 12:28 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.
>
> 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@chromium.org>


Hi maintainers,

Can you help review with this patch? Thanks


> ---
> v6, v5:
> don't create property in set_panel_orientation.
>
> v4, v3:
> create property in dsi driver and set value in panel.
>
> v2:
> create property in connector init
> https://patchwork.kernel.org/project/linux-mediatek/patch/20210426051848.2600890-1-hsinyi@chromium.org/
>
> v1:
> set panel orientation in dsi driver
> https://patchwork.kernel.org/project/linux-mediatek/patch/20210409045314.3420733-1-hsinyi@chromium.org/
> ---
>  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 7631f76e7f34..7189baaabf41 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 9282978060b0..5ac4538e4283 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 a5231ac3443a..f1d664e5abb2 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 9bee99fe5495..853855482af1 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 1922b278ffad..4396c1c4a5db 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);
>  int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
>                                           int min, int max);
>
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>