linux-kernel - Re: [PATCH 3/5] drm: shmobile: Switch to drm_crtc_init_with

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Message-ID: <20230405035952.GI9915@pendragon.ideasonboard.com>
Date:   Wed, 5 Apr 2023 06:59:52 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] drm: shmobile: Switch to drm_crtc_init_with_planes()

Hi Geert,

Thank you for the patch.

On Fri, Mar 31, 2023 at 04:48:09PM +0200, Geert Uytterhoeven wrote:
> The SH-Mobile DRM driver uses the legacy drm_crtc_init(), which
> advertizes only the formats in safe_modeset_formats[] (XR24 and AR24) as
> being supported.
> 
> Switch to drm_crtc_init_with_planes(), and advertize all supported
> (A)RGB modes, so we can use RGB565 as the default mode for the console.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
>  drivers/gpu/drm/shmobile/shmob_drm_crtc.c | 30 +++++++++++++++++++++--
>  1 file changed, 28 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/shmobile/shmob_drm_crtc.c b/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
> index 08dc1428aa16caf0..11dd2bc803e7cb62 100644
> --- a/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
> +++ b/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
> @@ -18,6 +18,7 @@
>  #include <drm/drm_gem_dma_helper.h>
>  #include <drm/drm_modeset_helper.h>
>  #include <drm/drm_modeset_helper_vtables.h>
> +#include <drm/drm_plane_helper.h>
>  #include <drm/drm_probe_helper.h>
>  #include <drm/drm_simple_kms_helper.h>
>  #include <drm/drm_vblank.h>
> @@ -478,16 +479,41 @@ static const struct drm_crtc_funcs crtc_funcs = {
>  	.disable_vblank = shmob_drm_disable_vblank,
>  };
>  
> +static const uint32_t modeset_formats[] = {
> +	DRM_FORMAT_RGB565,
> +	DRM_FORMAT_RGB888,
> +	DRM_FORMAT_ARGB8888,
> +	DRM_FORMAT_XRGB8888,
> +};
> +
> +static const struct drm_plane_funcs primary_plane_funcs = {
> +	DRM_PLANE_NON_ATOMIC_FUNCS,
> +};
> +
>  int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
>  {
>  	struct drm_crtc *crtc = &sdev->crtc.crtc;
> +	struct drm_plane *primary;
>  	int ret;
>  
>  	sdev->crtc.dpms = DRM_MODE_DPMS_OFF;
>  
> -	ret = drm_crtc_init(sdev->ddev, crtc, &crtc_funcs);
> -	if (ret < 0)
> +	primary = __drm_universal_plane_alloc(sdev->ddev, sizeof(*primary), 0,
> +					      0, &primary_plane_funcs,
> +					      modeset_formats,
> +					      ARRAY_SIZE(modeset_formats),
> +					      NULL, DRM_PLANE_TYPE_PRIMARY,
> +					      NULL);
> +	if (IS_ERR(primary))
> +		return PTR_ERR(primary);

This seems like a bit of a hack to me. Why don't you use the planes
created by shmob_drm_plane_create() instead of allocating a new one ?

> +
> +	ret = drm_crtc_init_with_planes(sdev->ddev, crtc, primary, NULL,
> +					&crtc_funcs, NULL);
> +	if (ret < 0) {
> +		drm_plane_cleanup(primary);
> +		kfree(primary);
>  		return ret;
> +	}
>  
>  	drm_crtc_helper_add(crtc, &crtc_helper_funcs);
>  

-- 
Regards,

Laurent Pinchart