Re: [PATCH 1/2] drm/exynos: mixer: cleanup pixelformat handling

From: Joonyoung Shim <jy0922.shim@samsung.com>
To: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>,
	linux-samsung-soc@vger.kernel.org
Cc: gustavo.padovan@collabora.co.uk, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 1/2] drm/exynos: mixer: cleanup pixelformat handling
Date: Fri, 24 Apr 2015 10:48:27 +0900	[thread overview]
Message-ID: <5539A0EB.6060706@samsung.com> (raw)
In-Reply-To: <1429791146-4410-2-git-send-email-tjakobi@math.uni-bielefeld.de>

Hi Tobias,

On 04/23/2015 09:12 PM, Tobias Jakobi wrote:
> Move the defines for the pixelformats that the mixer supports out
> of mixer_graph_buffer() to the top of the source.
> Then select the mixer pixelformat (pf) in mixer_graph_buffer() based on
> the plane's pf (and not bpp).
> Also add handling of RGB565 and XRGB1555 to the switch statement and
> exit early if the plane has an unsupported pf.
> 
> Partially based on 'drm/exynos: enable/disable blend based on pixel
> format' by Gustavo Padovan <gustavo.padovan@collabora.co.uk>.
> 
> Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
> ---
>  drivers/gpu/drm/exynos/exynos_mixer.c | 32 ++++++++++++++++++++++----------
>  1 file changed, 22 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
> index fbec750..1bd23ee 100644
> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> @@ -44,6 +44,12 @@
>  #define MIXER_WIN_NR		3
>  #define MIXER_DEFAULT_WIN	0
>  
> +/* The pixelformats that are natively supported by the mixer. */
> +#define MIXER_PIXELFORMAT_RGB565 4
> +#define MIXER_PIXELFORMAT_ARGB1555 5
> +#define MIXER_PIXELFORMAT_ARGB4444 6
> +#define MIXER_PIXELFORMAT_ARGB8888 7
> +

Seems be long, how about s/PIXELFORMAT/FORMAT or just MIXER_RGB565 ... ?
Please use tab between define name and value.

>  struct mixer_resources {
>  	int			irq;
>  	void __iomem		*mixer_regs;
> @@ -531,20 +537,26 @@ static void mixer_graph_buffer(struct mixer_context *ctx, int win)
>  
>  	plane = &ctx->planes[win];
>  
> -	#define RGB565 4
> -	#define ARGB1555 5
> -	#define ARGB4444 6
> -	#define ARGB8888 7
> +	switch (plane->pixel_format) {
> +	case DRM_FORMAT_XRGB4444:
> +		fmt = MIXER_PIXELFORMAT_ARGB4444;
> +		break;
> +
> +	case DRM_FORMAT_XRGB1555:
> +		fmt = MIXER_PIXELFORMAT_ARGB1555;
> +		break;
>  
> -	switch (plane->bpp) {
> -	case 16:
> -		fmt = ARGB4444;
> +	case DRM_FORMAT_RGB565:
> +		fmt = MIXER_PIXELFORMAT_RGB565;
>  		break;
> -	case 32:
> -		fmt = ARGB8888;
> +
> +	case DRM_FORMAT_XRGB8888:
> +		fmt = MIXER_PIXELFORMAT_ARGB8888;
>  		break;
> +
>  	default:
> -		fmt = ARGB8888;
> +		DRM_DEBUG_KMS("pixelformat unsupported by mixer\n");
> +		return;
>  	}
>  
>  	/* check if mixer supports requested scaling setup */
> 

Hmm missing formats having alpha?
DRM_FORMAT_ARGB4444
DRM_FORMAT_ARGB1555
DRM_FORMAT_ARGB8888

Thanks.
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