linux-kernel - Re: [PATCH RESEND v2 4/8] drm/vkms: Add support for RGB565 formats

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Message-ID: <Zx9eby4wpmnYPc7Y@fedora>
Date: Mon, 28 Oct 2024 10:50:39 +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 4/8] drm/vkms: Add support for RGB565 formats

On 26/10/24 - 11:17, Maíra Canal wrote:
> Hi Louis,
> 
> On 07/10/24 13:46, Louis Chauvet wrote:
> > The format RGB565 was already supported. Add the support for:
> > - BGR565
> > 
> > Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> > ---
> >   drivers/gpu/drm/vkms/vkms_formats.c | 25 ++++++++++++++++++++++++-
> >   drivers/gpu/drm/vkms/vkms_plane.c   |  1 +
> >   2 files changed, 25 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
> > index c03a481f5005..e34bea5da752 100644
> > --- a/drivers/gpu/drm/vkms/vkms_formats.c
> > +++ b/drivers/gpu/drm/vkms/vkms_formats.c
> > @@ -249,7 +249,7 @@ static struct pixel_argb_u16 argb_u16_from_RGB565(const __le16 *pixel)
> >   	return out_pixel;
> >   }
> > -static struct pixel_argb_u16 argb_u16_from_gray8(u16 gray)
> > +static struct pixel_argb_u16 argb_u16_from_gray8(u8 gray)
> 
> Again, fix the issue in the patch that introduce it.

Will do for the v2!

Thanks,
Louis Chauvet
 
> Best Regards,
> - Maíra
> 
> >   {
> >   	return argb_u16_from_u8888(255, gray, gray, gray);
> >   }
> > @@ -259,6 +259,26 @@ static struct pixel_argb_u16 argb_u16_from_grayu16(u16 gray)
> >   	return argb_u16_from_u16161616(0xFFFF, gray, gray, gray);
> >   }
> > +static struct pixel_argb_u16 argb_u16_from_BGR565(const __le16 *pixel)
> > +{
> > +	struct pixel_argb_u16 out_pixel;
> > +
> > +	s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
> > +	s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
> > +
> > +	u16 rgb_565 = le16_to_cpu(*pixel);
> > +	s64 fp_b = drm_int2fixp((rgb_565 >> 11) & 0x1f);
> > +	s64 fp_g = drm_int2fixp((rgb_565 >> 5) & 0x3f);
> > +	s64 fp_r = drm_int2fixp(rgb_565 & 0x1f);
> > +
> > +	out_pixel.a = (u16)0xffff;
> > +	out_pixel.b = drm_fixp2int_round(drm_fixp_mul(fp_b, fp_rb_ratio));
> > +	out_pixel.g = drm_fixp2int_round(drm_fixp_mul(fp_g, fp_g_ratio));
> > +	out_pixel.r = drm_fixp2int_round(drm_fixp_mul(fp_r, fp_rb_ratio));
> > +
> > +	return out_pixel;
> > +}
> > +
> >   VISIBLE_IF_KUNIT struct pixel_argb_u16 argb_u16_from_yuv888(u8 y, u8 channel_1, u8 channel_2,
> >   							    const struct conversion_matrix *matrix)
> >   {
> > @@ -447,6 +467,7 @@ READ_LINE_16161616(XRGB16161616_read_line, px, 0xFFFF, px[2], px[1], px[0])
> >   READ_LINE_16161616(XBGR16161616_read_line, px, 0xFFFF, px[0], px[1], px[2])
> >   READ_LINE(RGB565_read_line, px, __le16, argb_u16_from_RGB565, px)
> > +READ_LINE(BGR565_read_line, px, __le16, argb_u16_from_BGR565, px)
> >   READ_LINE(R8_read_line, px, u8, argb_u16_from_gray8, *px)
> > @@ -668,6 +689,8 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
> >   		return &XBGR16161616_read_line;
> >   	case DRM_FORMAT_RGB565:
> >   		return &RGB565_read_line;
> > +	case DRM_FORMAT_BGR565:
> > +		return &BGR565_read_line;
> >   	case DRM_FORMAT_NV12:
> >   	case DRM_FORMAT_NV16:
> >   	case DRM_FORMAT_NV24:
> > diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> > index 1e971c7760d9..a243a706459f 100644
> > --- a/drivers/gpu/drm/vkms/vkms_plane.c
> > +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> > @@ -26,6 +26,7 @@ static const u32 vkms_formats[] = {
> >   	DRM_FORMAT_ARGB16161616,
> >   	DRM_FORMAT_ABGR16161616,
> >   	DRM_FORMAT_RGB565,
> > +	DRM_FORMAT_BGR565,
> >   	DRM_FORMAT_NV12,
> >   	DRM_FORMAT_NV16,
> >   	DRM_FORMAT_NV24,
> >