[RFC PATCH 1/8] drm: Add drm_format_num_planes() utility function

[Rob Clark]

On Mon, Dec 19, 2011 at 4:33 PM,  <ville.syrjala at linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> This function returns the number of planes used by a specific pixel
> format.

btw, I end up with a very similar util fxn in omapdrm driver.. would
be nice to have this in core to avoid duplicating in every driver
supporting multi-planar

Reviewed-by: Rob Clark <rob.clark at linaro.org>

> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/drm_crtc_helper.c |   33 +++++++++++++++++++++++++++++++++
>  include/drm/drm_crtc_helper.h     |    3 +++
>  2 files changed, 36 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
> index ccbdc0b..f388708 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -979,3 +979,36 @@ void drm_helper_hpd_irq_event(struct drm_device *dev)
>                queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
>  }
>  EXPORT_SYMBOL(drm_helper_hpd_irq_event);
> +
> +
> +/**
> + * drm_format_num_planes - get the number of planes for format
> + * @format: pixel format (DRM_FORMAT_*)
> + *
> + * RETURNS:
> + * The number of planes used by the specified pixel format.
> + */
> +int drm_format_num_planes(uint32_t format)
> +{
> +       switch (format) {
> +       case DRM_FORMAT_YUV410:
> +       case DRM_FORMAT_YVU410:
> +       case DRM_FORMAT_YUV411:
> +       case DRM_FORMAT_YVU411:
> +       case DRM_FORMAT_YUV420:
> +       case DRM_FORMAT_YVU420:
> +       case DRM_FORMAT_YUV422:
> +       case DRM_FORMAT_YVU422:
> +       case DRM_FORMAT_YUV444:
> +       case DRM_FORMAT_YVU444:
> +               return 3;
> +       case DRM_FORMAT_NV12:
> +       case DRM_FORMAT_NV21:
> +       case DRM_FORMAT_NV16:
> +       case DRM_FORMAT_NV61:
> +               return 2;
> +       default:
> +               return 1;
> +       }
> +}
> +EXPORT_SYMBOL(drm_format_num_planes);
> diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
> index e88b7d7..37515d1 100644
> --- a/include/drm/drm_crtc_helper.h
> +++ b/include/drm/drm_crtc_helper.h
> @@ -144,4 +144,7 @@ extern void drm_helper_hpd_irq_event(struct drm_device *dev);
>
>  extern void drm_kms_helper_poll_disable(struct drm_device *dev);
>  extern void drm_kms_helper_poll_enable(struct drm_device *dev);
> +
> +extern int drm_format_num_planes(uint32_t format);
> +
>  #endif
> --
> 1.7.3.4
>
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