linux-kernel - Re: [PATCH 2/4] drm/atmel-hlcdc: do not swap w/h of the crtc when a plane is rotated

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Date:   Thu, 10 Jan 2019 18:48:25 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     Peter Rosin <peda@...ntia.se>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/4] drm/atmel-hlcdc: do not swap w/h of the crtc when a
 plane is rotated

On Thu, 10 Jan 2019 15:10:39 +0000
Peter Rosin <peda@...ntia.se> wrote:

> The destination crtc rectangle is independent of source plane rotation.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>
> ---
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index ea8fc0deb814..d6f93f029020 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -642,9 +642,6 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
>  	 * Swap width and size in case of 90 or 270 degrees rotation
>  	 */
>  	if (drm_rotation_90_or_270(state->base.rotation)) {
> -		tmp = state->crtc_w;
> -		state->crtc_w = state->crtc_h;
> -		state->crtc_h = tmp;

Again, I guess I assumed ->crtc_h/w were the width and height before
rotation when I initially added rotation support. This change might
break users too.

>  		tmp = state->src_w;
>  		state->src_w = state->src_h;
>  		state->src_h = tmp;