[PATCH 2/2] drm: rcar-du: Use %p4cc to print 4CC format

[Biju Das]

Hi Laurent,

Thanks for the feedback.

> Subject: Re: [PATCH 2/2] drm: rcar-du: Use %p4cc to print 4CC format
> 
> Hi Biju,
> 
> Thank you for the patch.
> 
> On Thu, Aug 25, 2022 at 11:39:05AM +0100, Biju Das wrote:
> > Replace use of struct rcar_du_format_info with %p4cc for printing 4CC
> > formats.
> 
> The code change looks good, but doesn't match the commit message. You're
> not replacing usage of struct rcar_du_format_info. I propose the
> following commit message:
> 
> Use the %p4cc format specifier to print 4CCs, which will provide a more
> readable message than the raw hex value.

OK.

> 
> > Reported-by: Geert Uytterhoeven <geert+renesas at glider.be>
> > Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
> > ---
> >  drivers/gpu/drm/rcar-du/rcar_du_kms.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> > b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> > index 21881fb5e84a..8c2719efda2a 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> > @@ -405,8 +405,8 @@ rcar_du_fb_create(struct drm_device *dev, struct
> > drm_file *file_priv,
> >
> >  	format = rcar_du_format_info(mode_cmd->pixel_format);
> >  	if (format == NULL) {
> > -		dev_dbg(dev->dev, "unsupported pixel format %08x\n",
> > -			mode_cmd->pixel_format);
> > +		dev_dbg(dev->dev, "unsupported pixel format %p4cc\n",
> > +			&mode_cmd->pixel_format);
> >  		return ERR_PTR(-EINVAL);
> >  	}
> >
> 
> There are two other occurrences:
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> index 26b25ca58968..83631ee2fff1 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> @@ -626,8 +626,8 @@ int __rcar_du_plane_atomic_check(struct drm_plane
> *plane,
> 
>  	*format = rcar_du_format_info(state->fb->format->format);
>  	if (*format == NULL) {
> -		dev_dbg(dev->dev, "%s: unsupported format %08x\n", __func__,
> -			state->fb->format->format);
> +		dev_dbg(dev->dev, "%s: unsupported format %p4cc\n",
> __func__,
> +			&state->fb->format->format);
>  		return -EINVAL;
>  	}
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
> b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
> index 25f50a297c11..8cd37d7b8ae2 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
> @@ -166,8 +166,8 @@ static int rcar_du_wb_enc_atomic_check(struct
> drm_encoder *encoder,
> 
>  	wb_state->format = rcar_du_format_info(fb->format->format);
>  	if (wb_state->format == NULL) {
> -		dev_dbg(dev->dev, "%s: unsupported format %08x\n", __func__,
> -			fb->format->format);
> +		dev_dbg(dev->dev, "%s: unsupported format %p4cc\n",
> __func__,
> +			&fb->format->format);
>  		return -EINVAL;
>  	}
> 
> I can add these changes to the patch and update the commit message when
> applying if you're fine with that. In that case,

I am ok with it.

Is it possible for you to share the git tree with latest RCar DU changes?
so that I can rebase RCar DU lib and RZ/G2L DU work on top of that.

Currently I am rebasing on top of drm_tip. Please let me know.

Thanks and regards,
Biju

> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
>