linux-kernel - Re: [PATCH v2 7/9] drm/vkms: Add range and encoding properties to pixel

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Message-ID: <ZeXoopxVQieA1WCl@localhost.localdomain>
Date: Mon, 4 Mar 2024 16:29:08 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Pekka Paalanen <pekka.paalanen@...labora.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
	Melissa Wen <melissa.srw@...il.com>,
	Maíra Canal <mairacanal@...eup.net>,
	Haneen Mohammed <hamohammed.sa@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, arthurgrillo@...eup.net,
	Jonathan Corbet <corbet@....net>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, jeremie.dautheribes@...tlin.com,
	miquel.raynal@...tlin.com, thomas.petazzoni@...tlin.com
Subject: Re: [PATCH v2 7/9] drm/vkms: Add range and encoding properties to
 pixel_read function

Le 29/02/24 - 14:24, Pekka Paalanen a écrit :
> On Tue, 27 Feb 2024 16:02:10 +0100
> Louis Chauvet <louis.chauvet@...tlin.com> wrote:
> 
> > (same as for PATCHv2 6/9, I took the patch from Arthur with no 
> > modifications)
> > 
> > Le 26/02/24 - 14:23, Pekka Paalanen a écrit :
> > > On Fri, 23 Feb 2024 12:37:27 +0100
> > > Louis Chauvet <louis.chauvet@...tlin.com> wrote:
> > >   
> > > > From: Arthur Grillo <arthurgrillo@...eup.net>
> > > > 
> > > > Create range and encoding properties. This should be noop, as none of
> > > > the conversion functions need those properties.  
> > > 
> > > None of the conversion function needs this? How can one say so?
> > > The previous patch is making use of them already, AFAICT?  
> > 
> > It's my fault, I mixed the commits (in Arthur's series, "Add range..." was 
> > before "Add YUV support"), but for me it makes no sens to have the color 
> > property without the support in the driver.
> 
> Ah, so if there was no YUV support, these properties would never affect
> anything. Ok, I see where that is coming from.
>
> > 
> > Maybe it's better just to merge "Add range..." with "Add YUV support"?
> > 
> > > How is this a noop? Is it not exposing new UAPI from VKMS?  
> > 
> > It's not a no-op from userspace, but from the driver side, yes.
> 
> If it all is already hooked up and handled in the driver, then say just
> that?
> 
> "Now that the driver internally handles these quantization ranges and YUV
> encoding matrices, expose the UAPI for setting them."
> 
> And fix the commit summary line too, nothing "pixel_read" here.

Ack
 
Kind regards,
Louis Chauvet

> Thanks,
> pq
> 
> > 
> > Kind regards,
> > Louis Chauvet
> > 
> > > Thanks,
> > > pq
> > >   
> > > > 
> > > > Signed-off-by: Arthur Grillo <arthurgrillo@...eup.net>
> > > > [Louis Chauvet: retained only relevant parts]
> > > > Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> > > > ---
> > > >  drivers/gpu/drm/vkms/vkms_plane.c | 9 +++++++++
> > > >  1 file changed, 9 insertions(+)
> > > > 
> > > > diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> > > > index 427ca67c60ce..95dfde297377 100644
> > > > --- a/drivers/gpu/drm/vkms/vkms_plane.c
> > > > +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> > > > @@ -228,5 +228,14 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> > > >  	drm_plane_create_rotation_property(&plane->base, DRM_MODE_ROTATE_0,
> > > >  					   DRM_MODE_ROTATE_MASK | DRM_MODE_REFLECT_MASK);
> > > >  
> > > > +	drm_plane_create_color_properties(&plane->base,
> > > > +					  BIT(DRM_COLOR_YCBCR_BT601) |
> > > > +					  BIT(DRM_COLOR_YCBCR_BT709) |
> > > > +					  BIT(DRM_COLOR_YCBCR_BT2020),
> > > > +					  BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
> > > > +					  BIT(DRM_COLOR_YCBCR_FULL_RANGE),
> > > > +					  DRM_COLOR_YCBCR_BT601,
> > > > +					  DRM_COLOR_YCBCR_FULL_RANGE);
> > > > +
> > > >  	return plane;
> > > >  }
> > > >   
> > >   
> > 
> > 
> > 
> 



-- 
Louis Chauvet, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com