linux-kernel - Re: [PATCH v2 05/22] media: rockchip: rga: use stride for offset calculation

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Message-ID: <7d9f41a8609fdae7631305585cab47fd45297c5c.camel@ndufresne.ca>
Date: Wed, 24 Dec 2025 10:00:34 -0500
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: Sven Püschel <s.pueschel@...gutronix.de>, Jacob Chen
	 <jacob-chen@...wrt.com>, Ezequiel Garcia <ezequiel@...guardiasur.com.ar>, 
 Mauro Carvalho Chehab
	 <mchehab@...nel.org>, Heiko Stuebner <heiko@...ech.de>, Rob Herring
	 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	 <conor+dt@...nel.org>
Cc: linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v2 05/22] media: rockchip: rga: use stride for offset
 calculation

Le mercredi 03 décembre 2025 à 16:52 +0100, Sven Püschel a écrit :
> Use the stride instead of the width for the offset calculation. This
> ensures that the bytesperline value doesn't need to match the width
> value of the image.
> 
> Furthermore this patch removes the dependency on the uv_factor property
> and instead reuses the v4l2_format_info to determine the correct
> division factor.
> 
> Signed-off-by: Sven Püschel <s.pueschel@...gutronix.de>
> ---
>  drivers/media/platform/rockchip/rga/rga-buf.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rga/rga-buf.c b/drivers/media/platform/rockchip/rga/rga-buf.c
> index 730bdf98565a5..b5e6b1b527ca8 100644
> --- a/drivers/media/platform/rockchip/rga/rga-buf.c
> +++ b/drivers/media/platform/rockchip/rga/rga-buf.c
> @@ -14,7 +14,6 @@
>  #include <media/videobuf2-dma-sg.h>
>  #include <media/videobuf2-v4l2.h>
>  
> -#include "rga-hw.h"
>  #include "rga.h"
>  
>  static ssize_t fill_descriptors(struct rga_dma_desc *desc, size_t max_desc,
> @@ -92,14 +91,19 @@ static int rga_buf_init(struct vb2_buffer *vb)
>  	return 0;
>  }
>  
> -static int get_plane_offset(struct rga_frame *f, int plane)
> +static int get_plane_offset(struct rga_frame *f,
> +			    const struct v4l2_format_info *info,
> +			    int plane)
>  {
> +	u32 stride = f->pix.plane_fmt[0].bytesperline;
> +
>  	if (plane == 0)
>  		return 0;
>  	if (plane == 1)
> -		return f->width * f->height;
> +		return stride * f->height;
>  	if (plane == 2)
> -		return f->width * f->height + (f->width * f->height / f->fmt->uv_factor);
> +		return stride * f->height +
> +		       (stride * f->height / info->hdiv / info->vdiv);

This was the only user of uv_factor, please cleanup rga.h/rga.c. I see there is
also redudant x_div/y_div, with this similar code re-implemented in
rga_get_addr_offset(), can you check for v3 if we can cleanup some more ?

One thought though is that this code is already hidden inside v4l2-common,
perhaps you could just expose it, this ensure that we don't accidently have
different information when configuring the HW and communicating with the user.

Nicolas

>  
>  	return -EINVAL;
>  }
> @@ -145,7 +149,7 @@ static int rga_buf_prepare(struct vb2_buffer *vb)
>  	/* Fill the remaining planes */
>  	info = v4l2_format_info(f->fmt->fourcc);
>  	for (i = info->mem_planes; i < info->comp_planes; i++)
> -		offsets[i] = get_plane_offset(f, i);
> +		offsets[i] = get_plane_offset(f, info, i);
>  
>  	rbuf->offset.y_off = offsets[0];
>  	rbuf->offset.u_off = offsets[1];

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