linux-kernel - Re: [PATCH 02/19] drm/atmel-hlcdc: Use the alpha format helper

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Message-ID: <20180109132708.2ae5e54f@bbrezillon>
Date:   Tue, 9 Jan 2018 13:27:08 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        thomas@...sch.nl
Subject: Re: [PATCH 02/19] drm/atmel-hlcdc: Use the alpha format helper

On Tue,  9 Jan 2018 11:56:21 +0100
Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:

> Now that the core has a drm format helper to tell if a format embeds an
> alpha component in it, let's use it.
> 
> Cc: Boris Brezillon <boris.brezillon@...e-electrons.com>

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 20 ++----------------
>  1 file changed, 3 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index 703c2d13603f..1a9318810a29 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -194,20 +194,6 @@ static int atmel_hlcdc_format_to_plane_mode(u32 format, u32 *mode)
>  	return 0;
>  }
>  
> -static bool atmel_hlcdc_format_embeds_alpha(u32 format)
> -{
> -	int i;
> -
> -	for (i = 0; i < sizeof(format); i++) {
> -		char tmp = (format >> (8 * i)) & 0xff;
> -
> -		if (tmp == 'A')
> -			return true;
> -	}
> -
> -	return false;
> -}
> -
>  static u32 heo_downscaling_xcoef[] = {
>  	0x11343311,
>  	0x000000f7,
> @@ -395,7 +381,7 @@ atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
>  		cfg |= ATMEL_HLCDC_LAYER_OVR | ATMEL_HLCDC_LAYER_ITER2BL |
>  		       ATMEL_HLCDC_LAYER_ITER;
>  
> -		if (atmel_hlcdc_format_embeds_alpha(format))
> +		if (drm_format_has_alpha(format))
>  			cfg |= ATMEL_HLCDC_LAYER_LAEN;
>  		else
>  			cfg |= ATMEL_HLCDC_LAYER_GAEN |
> @@ -566,7 +552,7 @@ atmel_hlcdc_plane_prepare_disc_area(struct drm_crtc_state *c_state)
>  		ovl_state = drm_plane_state_to_atmel_hlcdc_plane_state(ovl_s);
>  
>  		if (!ovl_s->fb ||
> -		    atmel_hlcdc_format_embeds_alpha(ovl_s->fb->format->format) ||
> +		    drm_format_has_alpha(ovl_s->fb->format->format) ||
>  		    ovl_state->alpha != 255)
>  			continue;
>  
> @@ -769,7 +755,7 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
>  
>  	if ((state->crtc_h != state->src_h || state->crtc_w != state->src_w) &&
>  	    (!desc->layout.memsize ||
> -	     atmel_hlcdc_format_embeds_alpha(state->base.fb->format->format)))
> +	     drm_format_has_alpha(state->base.fb->format->format)))
>  		return -EINVAL;
>  
>  	if (state->crtc_x < 0 || state->crtc_y < 0)