On Mon, Dec 01, 2014 at 09:20:59AM +0100, Boris Brezillon wrote:
> Add bus_formats and num_bus_formats fields and
> drm_display_info_set_bus_formats helper function to specify the bus
> formats supported by a given display.
>
> This information can be used by display controller drivers to configure
> the output interface appropriately (i.e. RGB565, RGB666 or RGB888 on raw
> RGB or LVDS busses).
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_crtc.c | 32 ++++++++++++++++++++++++++++++++
> include/drm/drm_crtc.h | 7 +++++++
> 2 files changed, 39 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index e79c8d3..d3b7ed0 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -763,6 +763,38 @@ static void drm_mode_remove(struct drm_connector *connector,
> drm_mode_destroy(connector->dev, mode);
> }
>
> +/*
This needs a /** marker to make it a valid kerneldoc comment.
> + * drm_display_info_set_bus_formats - set the supported bus formats
> + * @info: display info to store bus formats in
> + * @fmts: array containing the supported bus formats
> + * @nfmts: the number of entries in the fmts array
> + *
> + * Store the suppported bus formats in display info structure.
> + * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
> + * a full list of available formats.
> + */
> +int drm_display_info_set_bus_formats(struct drm_display_info *info, const u32 *fmts,
This one still exceeds 80-characters per line, but perhaps I'm reviewing
the wrong patch? Also I think fmts should be formats here.
> + unsigned int num_fmts)
And this should be num_formats, for consistency. Also make sure to keep
this consistent with the kerneldoc.
> +{
> + u32 *formats = NULL;
If you name the parameter formats, maybe bus_formats would be a good
alternative for this local variable. Or fmts here. I think it's most
important that the public API gets the more idiomatic name.
> +
> + if (!fmts && num_fmts)
> + return -EINVAL;
> +
> + if (fmts && num_fmts) {
> + formats = kmemdup(fmts, sizeof(*fmts) * num_fmts, GFP_KERNEL);
> + if (!formats)
> + return -ENOMEM;
> + }
> +
> + kfree(info->bus_formats);
> + info->bus_formats = formats;
> + info->num_bus_formats = num_fmts;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_display_info_set_bus_formats);
I think you'll want to call kfree() on the bus_formats array from
drm_connector_cleanup() as well to make sure you don't leak this on
driver unload.
Thierry
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