linux-kernel - Re: [PATCH 3/3] media: rcar-vin: Fix RAW10

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Message-ID: <20250403085700.GU1240431@ragnatech.se>
Date: Thu, 3 Apr 2025 10:57:00 +0200
From: Niklas Söderlund <niklas.soderlund@...natech.se>
To: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: Re: [PATCH 3/3] media: rcar-vin: Fix RAW10

Hi Tomi,

On 2025-04-03 11:15:04 +0300, Tomi Valkeinen wrote:
> Hi,
> 
> On 01/04/2025 00:11, Niklas Söderlund wrote:
> > Hi Tomi,
> > 
> > Thanks for your work.
> > 
> > On 2025-03-24 13:48:54 +0200, Tomi Valkeinen wrote:
> > > Fix the following to get RAW10 formats working:
> > > 
> > > In rvin_formats, the bpp is set to 4 for RAW10. As VIN unpacks RAW10 to
> > > 16-bit containers, the bpp should be 2.
> > > 
> > > Don't set VNDMR_YC_THR to the VNDMR register. The YC_THR is "YC Data
> > > Through Mode", used for YUV formats and should not be set for RAW10.
> > > 
> > > Fix the check related to the RGB666 format and CSI-2 mode. The
> > > VNMC_INF_RGB666 define is the same as used for RAW10 on Gen4, and RAW10
> > > is allowed on CSI-2 (whereas RGB666 is not allowed on Gen3 on CSI-2).
> > > This feels a bit hacky, though, and the formats should really have been
> > > verified already earlier.
> > 
> > I agree, it feels hacky. I would rather just remove the while switch
> > then try to "fix" it by extending it more. When testing this series I
> > needed a similar fix for VNMC_INF_RAW8 check below to get it to work on
> > Gen4.
> 
> Why is that? What is VNMC_INF_RAW8 overlapping with?

VNMC_INF_RAW8 is not overlapping the issue is the "if (!vin->is_csi)" 
check. On Gen3 RAW8 was supposedly only supported on the CSI-2 input, 
and not on the parallel bus available on some VIN instances.

On Gen4 the checks around vin->is_csi becomes skewed and as you point 
out should be cloned up. The effect at the moment however is that o Gen4 
when trying to capture RAW8 is_csi is not set (as this is a gen3 thing) 
and the "Invalid setting in Digital Pins" error path is hit.

Locally I have now removed this whole swtich, as you point out the 
formats should already be checked, and as far as I can tell they are.  
This check is a relic from early Gen3 support. And really proves after 
the Gen2 media graph clenups are done we should split rcar-dma.c -> 
rcar-dma-gen{2,3,4}.c to get rid of this mess ;-)

I would change this patch to just remove the whole switch. If you want 
to keep this fix as is I'm ok with that. I can submit a patch removing 
the switch if you like on top.

> 
>  Tomi
> 
> > > 
> > > Fixes: 1b7e7240eaf3 ("media: rcar-vin: Add support for RAW10")
> > > Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> > > ---
> > >   drivers/media/platform/renesas/rcar-vin/rcar-dma.c  | 9 +++++++--
> > >   drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c | 8 ++++----
> > >   2 files changed, 11 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/drivers/media/platform/renesas/rcar-vin/rcar-dma.c b/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
> > > index 53046614f7a1..f8394be8a922 100644
> > > --- a/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
> > > +++ b/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
> > > @@ -811,12 +811,17 @@ static int rvin_setup(struct rvin_dev *vin)
> > >   		case VNMC_INF_YUV8_BT656:
> > >   		case VNMC_INF_YUV10_BT656:
> > >   		case VNMC_INF_YUV16:
> > > -		case VNMC_INF_RGB666:
> > >   			if (vin->is_csi) {
> > >   				vin_err(vin, "Invalid setting in MIPI CSI2\n");
> > >   				return -EINVAL;
> > >   			}
> > >   			break;
> > > +		case VNMC_INF_RGB666:
> > > +			if (vin->info->model == RCAR_GEN3 && vin->is_csi) {
> > > +				vin_err(vin, "Invalid setting in MIPI CSI2\n");
> > > +				return -EINVAL;
> > > +			}
> > > +			break;
> > >   		case VNMC_INF_RAW8:
> > >   			if (!vin->is_csi) {
> > >   				vin_err(vin, "Invalid setting in Digital Pins\n");
> > > @@ -913,7 +918,7 @@ static int rvin_setup(struct rvin_dev *vin)
> > >   	case V4L2_PIX_FMT_SGBRG10:
> > >   	case V4L2_PIX_FMT_SGRBG10:
> > >   	case V4L2_PIX_FMT_SRGGB10:
> > > -		dmr = VNDMR_RMODE_RAW10 | VNDMR_YC_THR;
> > > +		dmr = VNDMR_RMODE_RAW10;
> > >   		break;
> > >   	default:
> > >   		vin_err(vin, "Invalid pixelformat (0x%x)\n",
> > > diff --git a/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c b/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c
> > > index 756fdfdbce61..65da8d513b52 100644
> > > --- a/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c
> > > +++ b/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c
> > > @@ -88,19 +88,19 @@ static const struct rvin_video_format rvin_formats[] = {
> > >   	},
> > >   	{
> > >   		.fourcc			= V4L2_PIX_FMT_SBGGR10,
> > > -		.bpp			= 4,
> > > +		.bpp			= 2,
> > >   	},
> > >   	{
> > >   		.fourcc			= V4L2_PIX_FMT_SGBRG10,
> > > -		.bpp			= 4,
> > > +		.bpp			= 2,
> > >   	},
> > >   	{
> > >   		.fourcc			= V4L2_PIX_FMT_SGRBG10,
> > > -		.bpp			= 4,
> > > +		.bpp			= 2,
> > >   	},
> > >   	{
> > >   		.fourcc			= V4L2_PIX_FMT_SRGGB10,
> > > -		.bpp			= 4,
> > > +		.bpp			= 2,
> > >   	},
> > >   };
> > > 
> > > -- 
> > > 2.43.0
> > > 
> > 
> 

-- 
Kind Regards,
Niklas Söderlund