linux-kernel - Re: [PATCH RESEND v2 5/8] drm/vkms: Add support for RGB888 formats

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Message-ID: <Zx9ebXIlkCAKz52F@fedora>
Date: Mon, 28 Oct 2024 10:50:37 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Maíra Canal <mairacanal@...eup.net>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
	Melissa Wen <melissa.srw@...il.com>,
	Haneen Mohammed <hamohammed.sa@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Simona Vetter <simona.vetter@...ll.ch>,
	dri-devel@...ts.freedesktop.org, arthurgrillo@...eup.net,
	linux-kernel@...r.kernel.org, jeremie.dautheribes@...tlin.com,
	miquel.raynal@...tlin.com, thomas.petazzoni@...tlin.com,
	seanpaul@...gle.com, marcheu@...gle.com, nicolejadeyee@...gle.com,
	20241007-yuv-v12-0-01c1ada6fec8@...tlin.com
Subject: Re: [PATCH RESEND v2 5/8] drm/vkms: Add support for RGB888 formats

On 26/10/24 - 11:51, Maíra Canal wrote:
> Hi Louis,
> 
> On 07/10/24 13:46, Louis Chauvet wrote:
> > Add the support for:
> > - RGB888
> > - BGR888
> > 
> > Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> > ---
> >   drivers/gpu/drm/vkms/vkms_formats.c | 7 +++++++
> >   drivers/gpu/drm/vkms/vkms_plane.c   | 2 ++
> >   2 files changed, 9 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
> > index e34bea5da752..2376ea8661ac 100644
> > --- a/drivers/gpu/drm/vkms/vkms_formats.c
> > +++ b/drivers/gpu/drm/vkms/vkms_formats.c
> > @@ -461,6 +461,9 @@ READ_LINE_ARGB8888(ABGR8888_read_line, px, px[3], px[0], px[1], px[2])
> >   READ_LINE_ARGB8888(RGBA8888_read_line, px, px[0], px[3], px[2], px[1])
> >   READ_LINE_ARGB8888(BGRA8888_read_line, px, px[0], px[1], px[2], px[3])
> > +READ_LINE_ARGB8888(RGB888_read_line, px, 255, px[2], px[1], px[0])
> > +READ_LINE_ARGB8888(BGR888_read_line, px, 255, px[0], px[1], px[2])
> > +
> >   READ_LINE_16161616(ARGB16161616_read_line, px, px[3], px[2], px[1], px[0])
> >   READ_LINE_16161616(ABGR16161616_read_line, px, px[3], px[0], px[1], px[2])
> >   READ_LINE_16161616(XRGB16161616_read_line, px, 0xFFFF, px[2], px[1], px[0])
> > @@ -679,6 +682,10 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
> >   		return &RGBX8888_read_line;
> >   	case DRM_FORMAT_BGRX8888:
> >   		return &BGRX8888_read_line;
> > +	case DRM_FORMAT_RGB888:
> > +		return RGB888_read_line;
> 
> Shouldn't it be &RGB888_read_line?

According to [1], &function, function, ***function are understood the 
same by gcc.

But this is ugly and I will change to use & everywhere, thanks!

[1]:https://stackoverflow.com/questions/6893285/why-do-function-pointer-definitions-work-with-any-number-of-ampersands-or-as

Thanks,
Louis Chauvet
 
> > +	case DRM_FORMAT_BGR888:
> > +		return BGR888_read_line;
> 
> Same.
> 
> Best Regards,
> - Maíra
> 
> >   	case DRM_FORMAT_ARGB16161616:
> >   		return &ARGB16161616_read_line;
> >   	case DRM_FORMAT_ABGR16161616:
> > diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> > index a243a706459f..0fa589abc53a 100644
> > --- a/drivers/gpu/drm/vkms/vkms_plane.c
> > +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> > @@ -21,6 +21,8 @@ static const u32 vkms_formats[] = {
> >   	DRM_FORMAT_XBGR8888,
> >   	DRM_FORMAT_RGBX8888,
> >   	DRM_FORMAT_BGRX8888,
> > +	DRM_FORMAT_RGB888,
> > +	DRM_FORMAT_BGR888,
> >   	DRM_FORMAT_XRGB16161616,
> >   	DRM_FORMAT_XBGR16161616,
> >   	DRM_FORMAT_ARGB16161616,
> >