linux-kernel - Re: [PATCH 2/6] media: vsp1: Correct the pitch on multiplanar formats

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Date:   Fri, 14 Sep 2018 11:59:05 +0100
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] media: vsp1: Correct the pitch on multiplanar formats

Hi Laurent,

On 14/09/18 11:25, Laurent Pinchart wrote:
> Hi Kieran,
> 
> Thank you for the patch.
> 
> On Friday, 31 August 2018 17:40:40 EEST Kieran Bingham wrote:
>> DRM pipelines now support tri-planar as well as packed formats with
>> YCbCr, however the pitch calculation was not updated to support this.
>>
>> Correct this by adjusting the bytesperline accordingly when 3 planes are
>> used.
>>
>> Fixes: 7863ac504bc5 ("drm: rcar-du: Add tri-planar memory formats support")
>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> 
> I already have a similar patch from Matsuoka-san in my tree, please see 
> https://patchwork.kernel.org/patch/10425565/. I'll update it with the fixes 
> tag.
> 
>> ---
>>  drivers/media/platform/vsp1/vsp1_drm.c | 10 ++++++++++
>>  include/media/vsp1.h                   |  2 +-
>>  2 files changed, 11 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/platform/vsp1/vsp1_drm.c
>> b/drivers/media/platform/vsp1/vsp1_drm.c index b9c0f695d002..b9afd98f6867
>> 100644
>> --- a/drivers/media/platform/vsp1/vsp1_drm.c
>> +++ b/drivers/media/platform/vsp1/vsp1_drm.c
>> @@ -814,6 +814,16 @@ int vsp1_du_atomic_update(struct device *dev, unsigned
>> int pipe_index, rpf->format.num_planes = fmtinfo->planes;
>>  	rpf->format.plane_fmt[0].bytesperline = cfg->pitch;
>>  	rpf->format.plane_fmt[1].bytesperline = cfg->pitch;
>> +
>> +	/*
>> +	 * Packed YUV formats are subsampled, but the packing of two components
>> +	 * into a single plane compensates for this leaving the bytesperline
>> +	 * to be the correct value. For multiplanar formats we must adjust the
>> +	 * pitch accordingly.
>> +	 */
>> +	if (fmtinfo->planes == 3)
>> +		rpf->format.plane_fmt[1].bytesperline /= fmtinfo->hsub;
>> +
>>  	rpf->alpha = cfg->alpha;
>>
>>  	rpf->mem.addr[0] = cfg->mem[0];
>> diff --git a/include/media/vsp1.h b/include/media/vsp1.h
>> index 3093b9cb9067..0ce19b595cc7 100644
>> --- a/include/media/vsp1.h
>> +++ b/include/media/vsp1.h
>> @@ -46,7 +46,7 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int
>> pipe_index, /**
>>   * struct vsp1_du_atomic_config - VSP atomic configuration parameters
>>   * @pixelformat: plane pixel format (V4L2 4CC)
>> - * @pitch: line pitch in bytes, for all planes
>> + * @pitch: line pitch in bytes
> 
> Should I update the above-mentioned patch with this as well ? How about 
> phrasing it as "line pitch in bytes for the first plane" ?

Yes, your suggestion sounds fine.

The patch at [0] looks good to me as a fix for this issue.

for: "v4l: vsp1: Fix YCbCr planar formats pitch calculation" [0]
With the fixes tag, and documentation updated:

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

[0]  https://patchwork.kernel.org/patch/10425565

> 
>>   * @mem: DMA memory address for each plane of the frame buffer
>>   * @src: source rectangle in the frame buffer (integer coordinates)
>>   * @dst: destination rectangle on the display (integer coordinates)
>