Re: [PATCH v2 6/6] media: nxp: imx8-isi: Add additional 32-bit RGB format support

[Laurent Pinchart]

Hi Guoniu, Robert,

Thank you for the patch.

On Mon, Jul 20, 2026 at 11:34:08AM +0800, Guoniu Zhou wrote:
> Add support for additional 32-bit RGB pixel formats (BGRA32, RGBA32,
> BGRX32, RGBX32, ARGB2101010) and extend existing ABGR32 format with
> full memory-to-memory capabilities to meet Android requirements.

What are those Android requirements ?

> All formats support capture, M2M input, and M2M output operations,
> enabling complete format conversion pipelines.
> 
> Signed-off-by: Robert Chiras <robert.chiras@xxxxxxx>
> Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> Signed-off-by: Guoniu Zhou <guoniu.zhou@xxxxxxxxxxx>
> ---
> Changes in v2:
> - Add Reviewed-by tag from Frank Li
> ---
>  .../media/platform/nxp/imx8-isi/imx8-isi-video.c   | 59 +++++++++++++++++++++-
>  1 file changed, 58 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
> index 05b51b98344b..ef638af350fe 100644
> --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
> +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
> @@ -160,12 +160,69 @@ static const struct mxc_isi_format_info mxc_isi_formats[] = {
>  	}, {
>  		.mbus_code	= MEDIA_BUS_FMT_RGB888_1X24,
>  		.fourcc		= V4L2_PIX_FMT_ABGR32,
> -		.type		= MXC_ISI_VIDEO_CAP | MXC_ISI_VIDEO_M2M_CAP,
> +		.type		= MXC_ISI_VIDEO_CAP | MXC_ISI_VIDEO_M2M_OUT
> +				| MXC_ISI_VIDEO_M2M_CAP,
> +		.isi_in_format	= CHNL_MEM_RD_CTRL_IMG_TYPE_XRGB8,

This doesn't seem right. The value is the same as for
V4L2_PIX_FMT_XBGR32. As far as I understand, the ISI will ignore the
alpha bits (MSBs in the 32-bit data).

This is why the V4L2_PIX_FMT_ABGR32 format doesn't set
MXC_ISI_VIDEO_M2M_OUT: to be supported as an output format (input to the
ISI), we would need a hardware mode where the alpha bits are read from
memory and used by the ISI. I recommend dropping this part of the patch.

>  		.isi_out_format	= CHNL_IMG_CTRL_FORMAT_ARGB8888,
>  		.mem_planes	= 1,
>  		.color_planes	= 1,
>  		.depth		= { 32 },
>  		.encoding	= MXC_ISI_ENC_RGB,
> +	}, {
> +		.mbus_code	= MEDIA_BUS_FMT_RGB888_1X24,
> +		.fourcc		= V4L2_PIX_FMT_BGRA32,
> +		.type		= MXC_ISI_VIDEO_CAP | MXC_ISI_VIDEO_M2M_OUT
> +				| MXC_ISI_VIDEO_M2M_CAP,
> +		.isi_in_format	= CHNL_MEM_RD_CTRL_IMG_TYPE_RGBX8,

Same comment here, this format should not have MXC_ISI_VIDEO_M2M_OUT
set.

> +		.isi_out_format	= CHNL_IMG_CTRL_FORMAT_RGBA8888,
> +		.mem_planes	= 1,
> +		.color_planes	= 1,
> +		.depth		= { 32 },
> +		.encoding	= MXC_ISI_ENC_RGB,
> +	}, {
> +		.mbus_code	= MEDIA_BUS_FMT_RGB888_1X24,
> +		.fourcc		= V4L2_PIX_FMT_RGBA32,
> +		.type		= MXC_ISI_VIDEO_CAP | MXC_ISI_VIDEO_M2M_OUT
> +				| MXC_ISI_VIDEO_M2M_CAP,
> +		.isi_in_format	= CHNL_MEM_RD_CTRL_IMG_TYPE_XBGR8,

Same here too.

> +		.isi_out_format	= CHNL_IMG_CTRL_FORMAT_ABGR8888,
> +		.mem_planes	= 1,
> +		.color_planes	= 1,
> +		.depth		= { 32 },
> +		.encoding	= MXC_ISI_ENC_RGB,
> +	}, {
> +		.mbus_code	= MEDIA_BUS_FMT_RGB888_1X24,
> +		.fourcc		= V4L2_PIX_FMT_BGRX32,
> +		.type		= MXC_ISI_VIDEO_CAP | MXC_ISI_VIDEO_M2M_OUT
> +				| MXC_ISI_VIDEO_M2M_CAP,
> +		.isi_in_format	= CHNL_MEM_RD_CTRL_IMG_TYPE_RGBX8,
> +		.isi_out_format	= CHNL_IMG_CTRL_FORMAT_RGBX888,
> +		.mem_planes	= 1,
> +		.color_planes	= 1,
> +		.depth		= { 32 },
> +		.encoding	= MXC_ISI_ENC_RGB,
> +	}, {
> +		.mbus_code	= MEDIA_BUS_FMT_RGB888_1X24,
> +		.fourcc		= V4L2_PIX_FMT_RGBX32,
> +		.type		= MXC_ISI_VIDEO_CAP | MXC_ISI_VIDEO_M2M_OUT
> +				| MXC_ISI_VIDEO_M2M_CAP,
> +		.isi_in_format	= CHNL_MEM_RD_CTRL_IMG_TYPE_XBGR8,
> +		.isi_out_format	= CHNL_IMG_CTRL_FORMAT_XBGR888,
> +		.mem_planes	= 1,
> +		.color_planes	= 1,
> +		.depth		= { 32 },
> +		.encoding	= MXC_ISI_ENC_RGB,
> +	}, {
> +		.mbus_code	= MEDIA_BUS_FMT_RGB888_1X24,
> +		.fourcc		= V4L2_PIX_FMT_ARGB2101010,
> +		.type		= MXC_ISI_VIDEO_CAP | MXC_ISI_VIDEO_M2M_OUT
> +				| MXC_ISI_VIDEO_M2M_CAP,
> +		.isi_in_format	= CHNL_MEM_RD_CTRL_IMG_TYPE_A2RGB10,
> +		.isi_out_format	= CHNL_IMG_CTRL_FORMAT_A2RGB10,
> +		.mem_planes	= 1,
> +		.color_planes	= 1,
> +		.depth		= { 32 },
> +		.encoding	= MXC_ISI_ENC_RGB,

The rest looks good. I have tested all the new formats, both on the
input and output side, and have not noticed any issue.

Tested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

>  	},
>  	/*
>  	 * RAW formats

-- 
Regards,

Laurent Pinchart