On Tue, Jul 22, 2014 at 02:23:45PM +0200, Boris BREZILLON wrote:
> Add bus_formats and nbus_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 at free-electrons.com>
> ---
> drivers/gpu/drm/drm_crtc.c | 28 ++++++++++++++++++++++++++++
> include/drm/drm_crtc.h | 8 ++++++++
> 2 files changed, 36 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index c808a09..50c8395 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -825,6 +825,34 @@ static void drm_mode_remove(struct drm_connector
> *connector,
> drm_mode_destroy(connector->dev, mode);
> }
>
> +/*
> + * 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.
> + */
> +int drm_display_info_set_bus_formats(struct drm_display_info *info,
> + const enum video_bus_format *fmts,
> + int nfmts)
Can you make nfmts unsigned please?
> +{
> + enum video_bus_format *formats = NULL;
> +
> + if (fmts && nfmts) {
> + formats = kmemdup(fmts, sizeof(*fmts) * nfmts, GFP_KERNEL);
> + if (!formats)
> + return -ENOMEM;
> + }
> +
> + kfree(info->bus_formats);
> + info->bus_formats = formats;
> + info->nbus_formats = formats ? nfmts : 0;
And perhaps check for formats == NULL && nfmts != 0 since that's not a
valid pair of values. Then you can simply assign this directly without
relying on the value of formats.
Also other variable names use "num_" as a prefix instead of "n", so if
you're going to respin anyway might as well make the names more
consistent.
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_display_info_set_bus_formats);
> +
> /**
> * drm_connector_init - Init a preallocated connector
> * @dev: DRM device
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index e529b68..957729b 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -31,6 +31,7 @@
> #include <linux/idr.h>
> #include <linux/fb.h>
> #include <linux/hdmi.h>
> +#include <linux/video-bus-format.h>
> #include <drm/drm_mode.h>
> #include <drm/drm_fourcc.h>
> #include <drm/drm_modeset_lock.h>
> @@ -121,6 +122,9 @@ struct drm_display_info {
> enum subpixel_order subpixel_order;
> u32 color_formats;
>
> + const enum video_bus_format *bus_formats;
> + int nbus_formats;
unsigned int here too, please.
Thierry
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