On 2018-04-19 11:31, Jacopo Mondi wrote:
> Add support for storing image format information in DRM bridges with
> associated helper function.
>
> This patch replicates for bridges what 'drm_display_info_set_bus_formats()'
> is for connectors.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_bridge.c | 30 ++++++++++++++++++++++++++++++
> include/drm/drm_bridge.h | 8 ++++++++
> 2 files changed, 38 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index 1638bfe..e2ad098 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -157,6 +157,36 @@ void drm_bridge_detach(struct drm_bridge *bridge)
> }
>
> /**
> + * drm_bridge_set_bus_formats() - set bridge supported image formats
> + * @bridge: the bridge to set image formats in
> + * @formats: array of MEDIA_BUS_FMT\_ supported image formats
> + * @num_formats: number of elements in the @formats array
> + *
> + * Store a list of supported image formats in a bridge.
> + * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
> + * a full list of available formats.
> + */
> +int drm_bridge_set_bus_formats(struct drm_bridge *bridge, const u32 *formats,
> + unsigned int num_formats)
> +{
> + u32 *fmts;
> +
> + if (!formats || !num_formats)
> + return -EINVAL;
I see no compelling reason to forbid restoring the number of reported
input formats to zero? I can't think of a use right now of course, but it
seems a bit odd all the same.
Cheers,
Peter
> +
> + fmts = kmemdup(formats, sizeof(*formats) * num_formats, GFP_KERNEL);
> + if (!fmts)
> + return -ENOMEM;
> +
> + kfree(bridge->bus_formats);
> + bridge->bus_formats = fmts;
> + bridge->num_bus_formats = num_formats;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_bridge_set_bus_formats);
> +
> +/**
> * DOC: bridge callbacks
> *
> * The &drm_bridge_funcs ops are populated by the bridge driver. The DRM
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index 3270fec..6b3648c 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -258,6 +258,9 @@ struct drm_bridge_timings {
> * @encoder: encoder to which this bridge is connected
> * @next: the next bridge in the encoder chain
> * @of_node: device node pointer to the bridge
> + * @bus_formats: wire image formats. Array of @num_bus_formats MEDIA_BUS_FMT\_
> + * elements
> + * @num_bus_formats: size of @bus_formats array
> * @list: to keep track of all added bridges
> * @timings: the timing specification for the bridge, if any (may
> * be NULL)
> @@ -271,6 +274,9 @@ struct drm_bridge {
> #ifdef CONFIG_OF
> struct device_node *of_node;
> #endif
> + const u32 *bus_formats;
> + unsigned int num_bus_formats;
> +
> struct list_head list;
> const struct drm_bridge_timings *timings;
>
> @@ -296,6 +302,8 @@ void drm_bridge_mode_set(struct drm_bridge *bridge,
> struct drm_display_mode *adjusted_mode);
> void drm_bridge_pre_enable(struct drm_bridge *bridge);
> void drm_bridge_enable(struct drm_bridge *bridge);
> +int drm_bridge_set_bus_formats(struct drm_bridge *bridge, const u32 *fmts,
> + unsigned int num_fmts);
>
> #ifdef CONFIG_DRM_PANEL_BRIDGE
> struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,
>
