linux-kernel - Re: [PATCH v3 12/14] media: uapi: Create a dedicated header for Hantro control

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Message-ID: <2617680.mvXUDI8C0e@kista>
Date:   Fri, 25 Feb 2022 20:16:38 +0100
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     mchehab@...nel.org, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        mripard@...nel.org, paul.kocialkowski@...tlin.com, wens@...e.org,
        jonas@...boo.se, nicolas@...fresne.ca,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        kernel@...labora.com, knaerzche@...il.com, jc@...esim.co.uk,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: Re: [PATCH v3 12/14] media: uapi: Create a dedicated header for Hantro control

Hi!

Dne petek, 25. februar 2022 ob 17:45:58 CET je Benjamin Gaignard napisal(a):
> Hantro hardware needs a dedicated v4l2 control to perform HEVC
> decoding. Move it to a dedicated header file to prepare HEVC
> uAPI un-staging.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
>  .../userspace-api/media/drivers/hantro.rst    |  5 -----
>  drivers/staging/media/hantro/hantro_drv.c     |  1 +
>  include/media/hevc-ctrls.h                    | 13 -------------
>  include/uapi/linux/hantro-media.h             | 19 +++++++++++++++++++
>  include/uapi/linux/v4l2-controls.h            |  5 +++++
>  5 files changed, 25 insertions(+), 18 deletions(-)
>  create mode 100644 include/uapi/linux/hantro-media.h
> 
> diff --git a/Documentation/userspace-api/media/drivers/hantro.rst b/
Documentation/userspace-api/media/drivers/hantro.rst
> index cd9754b4e005..78dcd2a44a03 100644
> --- a/Documentation/userspace-api/media/drivers/hantro.rst
> +++ b/Documentation/userspace-api/media/drivers/hantro.rst
> @@ -12,8 +12,3 @@ The Hantro video decoder driver implements the following 
driver-specific control
>      to before syntax element "slice_temporal_mvp_enabled_flag".
>      If IDR, the skipped bits are just "pic_output_flag"
>      (separate_colour_plane_flag is not supported).
> -
> -.. note::
> -
> -        This control is not yet part of the public kernel API and
> -        it is expected to change.
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/
media/hantro/hantro_drv.c
> index 6f58c259d8fc..783a92a38c8e 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -11,6 +11,7 @@
>   */
>  
>  #include <linux/clk.h>
> +#include <linux/hantro-media.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
> index cbf41d180fe9..f29298c8c2f8 100644
> --- a/include/media/hevc-ctrls.h
> +++ b/include/media/hevc-ctrls.h
> @@ -443,17 +443,4 @@ struct v4l2_ctrl_hevc_scaling_matrix {
>  	__u8	scaling_list_dc_coef_32x32[2];
>  };
>  
> -/*  MPEG-class control IDs specific to the Hantro driver as defined by V4L2 
*/
> -#define V4L2_CID_CODEC_HANTRO_BASE				
(V4L2_CTRL_CLASS_CODEC | 0x1200)
> -/*
> - * V4L2_CID_HANTRO_HEVC_SLICE_HEADER_SKIP -
> - * the number of data (in bits) to skip in the
> - * slice segment header.
> - * If non-IDR, the bits to be skipped go from syntax element 
"pic_output_flag"
> - * to before syntax element "slice_temporal_mvp_enabled_flag".
> - * If IDR, the skipped bits are just "pic_output_flag"
> - * (separate_colour_plane_flag is not supported).
> - */
> -#define V4L2_CID_HANTRO_HEVC_SLICE_HEADER_SKIP	
(V4L2_CID_CODEC_HANTRO_BASE + 0)
> -
>  #endif
> diff --git a/include/uapi/linux/hantro-media.h b/include/uapi/linux/hantro-
media.h
> new file mode 100644
> index 000000000000..b4e7ab7e6452
> --- /dev/null
> +++ b/include/uapi/linux/hantro-media.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */

I get
error: include/uapi/linux/hantro-media.h: missing "WITH Linux-syscall-note" 
for SPDX-License-Identifier
make[1]: *** [scripts/Makefile.headersinst:63: usr/include/linux/hantro-
media.h] Error 1

when installing headers.

Best regards,
Jernej

> +
> +#ifndef __UAPI_HANTRO_MEDIA_H__
> +#define __UAPI_HANTRO_MEDIA_H__
> +
> +#include <linux/v4l2-controls.h>
> +
> +/*
> + * V4L2_CID_HANTRO_HEVC_SLICE_HEADER_SKIP -
> + * the number of data (in bits) to skip in the
> + * slice segment header.
> + * If non-IDR, the bits to be skipped go from syntax element 
"pic_output_flag"
> + * to before syntax element "slice_temporal_mvp_enabled_flag".
> + * If IDR, the skipped bits are just "pic_output_flag"
> + * (separate_colour_plane_flag is not supported).
> + */
> +#define V4L2_CID_HANTRO_HEVC_SLICE_HEADER_SKIP	
(V4L2_CID_USER_HANTRO_BASE + 0)
> +
> +#endif /* __UAPI_HANTRO_MEDIA_H__ */
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-
controls.h
> index c8e0f84d204d..d56a1c7fb91d 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -218,6 +218,11 @@ enum v4l2_colorfx {
>   * We reserve 16 controls for this driver.
>   */
>  #define V4L2_CID_USER_ALLEGRO_BASE		(V4L2_CID_USER_BASE + 
0x1170)
> +/*
> + * The base for Hantro driver controls.
> + * We reserve 128 controls for this driver.
> + */
> +#define V4L2_CID_USER_HANTRO_BASE		(V4L2_CID_USER_BASE + 
0x1180)
>  
>  /* MPEG-class control IDs */
>  /* The MPEG controls are applicable to all codec controls
> -- 
> 2.32.0
> 
>