linux-kernel - Re: [PATCH v4 03/11] gpu: ipu-v3: Add planar support to interlaced scan

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Date:   Fri, 05 Oct 2018 11:48:57 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Steve Longerbeam <slongerbeam@...il.com>,
        linux-media@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        "open list:DRM DRIVERS FOR FREESCALE IMX" 
        <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH v4 03/11] gpu: ipu-v3: Add planar support to interlaced
 scan

On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
> To support interlaced scan with planar formats, cpmem SLUV must
> be programmed with the correct chroma line stride. For full and
> partial planar 4:2:2 (YUV422P, NV16), chroma line stride must
> be doubled. For full and partial planar 4:2:0 (YUV420, YVU420, NV12),
> chroma line stride must _not_ be doubled, since a single chroma line
> is shared by two luma lines.
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
> ---
>  drivers/gpu/ipu-v3/ipu-cpmem.c              | 26 +++++++++++++++++++--
>  drivers/staging/media/imx/imx-ic-prpencvf.c |  3 ++-
>  drivers/staging/media/imx/imx-media-csi.c   |  3 ++-
>  include/video/imx-ipu-v3.h                  |  3 ++-
>  4 files changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
> index a9d2501500a1..d41df8034c5b 100644
> --- a/drivers/gpu/ipu-v3/ipu-cpmem.c
> +++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
> @@ -273,9 +273,10 @@ void ipu_cpmem_set_uv_offset(struct ipuv3_channel *ch, u32 u_off, u32 v_off)
>  }
>  EXPORT_SYMBOL_GPL(ipu_cpmem_set_uv_offset);
>  
> -void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
> +void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride,
> +			       u32 pixelformat)
>  {
> -	u32 ilo, sly;
> +	u32 ilo, sly, sluv;
>  
>  	if (stride < 0) {
>  		stride = -stride;
> @@ -286,9 +287,30 @@ void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
>  
>  	sly = (stride * 2) - 1;
>  
> +	switch (pixelformat) {
> +	case V4L2_PIX_FMT_YUV420:
> +	case V4L2_PIX_FMT_YVU420:
> +		sluv = stride / 2 - 1;
> +		break;
> +	case V4L2_PIX_FMT_NV12:
> +		sluv = stride - 1;
> +		break;
> +	case V4L2_PIX_FMT_YUV422P:
> +		sluv = stride - 1;
> +		break;
> +	case V4L2_PIX_FMT_NV16:
> +		sluv = stride * 2 - 1;
> +		break;
> +	default:
> +		sluv = 0;
> +		break;
> +	}
> +
>  	ipu_ch_param_write_field(ch, IPU_FIELD_SO, 1);
>  	ipu_ch_param_write_field(ch, IPU_FIELD_ILO, ilo);
>  	ipu_ch_param_write_field(ch, IPU_FIELD_SLY, sly);
> +	if (sluv)
> +		ipu_ch_param_write_field(ch, IPU_FIELD_SLUV, sluv);
>  };
>  EXPORT_SYMBOL_GPL(ipu_cpmem_interlaced_scan);
[...]

Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

and

Acked-by: Philipp Zabel <p.zabel@...gutronix.de>

to be merged with the rest of the series via the media tree. I'll take
care not to introduce nontrivial conflicts in imx-drm.

regards
Philipp