linux-kernel - Re: [PATCH v2 1/3] drm: Remove superfluous arg when calling to drm_fbdev_generic

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Date:   Mon, 2 May 2022 19:06:37 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 1/3] drm: Remove superfluous arg when calling to
 drm_fbdev_generic_setup()

Hi Javier,

Thank you for the patch.

On Mon, May 02, 2022 at 05:38:58PM +0200, Javier Martinez Canillas wrote:
> The drm_fbdev_generic_setup() function already sets the preferred bits per
> pixel for the device to dev->mode_config.preferred_depth, if preferred_bpp
> value is zero.
> 
> Passing the same value to the function is unnecessary. Let's cleanup that
> in the two drivers that do it.

This looks fine, so

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

but why do we have two different mechanisms to set the preferred depth ?
Could we get all drivers to set dev->mode_config.preferred_depth and
drop the depth option to drm_fbdev_generic_setup() ? There's a FIXME
comment in drm_fbdev_generic_setup() that could be related.

> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
> ---
> 
> (no changes since v1)
> 
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 2 +-
>  drivers/gpu/drm/tiny/cirrus.c                   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index fe4269c5aa0a..ace92459e462 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -349,7 +349,7 @@ static int hibmc_pci_probe(struct pci_dev *pdev,
>  		goto err_unload;
>  	}
>  
> -	drm_fbdev_generic_setup(dev, dev->mode_config.preferred_depth);
> +	drm_fbdev_generic_setup(dev, 0);
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
> index c8e791840862..ed5a2e14894a 100644
> --- a/drivers/gpu/drm/tiny/cirrus.c
> +++ b/drivers/gpu/drm/tiny/cirrus.c
> @@ -601,7 +601,7 @@ static int cirrus_pci_probe(struct pci_dev *pdev,
>  	if (ret)
>  		return ret;
>  
> -	drm_fbdev_generic_setup(dev, dev->mode_config.preferred_depth);
> +	drm_fbdev_generic_setup(dev, 0);
>  	return 0;
>  }
>  

-- 
Regards,

Laurent Pinchart