Re: [RFCv3 PATCH 3/8] v4l2-subdev: add support for the new edid ioctls.

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Hi Hans,
   For EDID update, it is recommended that the HPD line be toggled
after the EDID update is completed. So for the driver to detect the
EDID write is complete, probably a field mentioning the EDID write
completed would be good, so that the HPD toggling can be done by the
driver.

Best Regards
Soby Mathew

On 8/10/12, Hans Verkuil <hans.verkuil@xxxxxxxxx> wrote:
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> ---
>  drivers/media/video/v4l2-compat-ioctl32.c |   57
> +++++++++++++++++++++++++++++
>  drivers/media/video/v4l2-ioctl.c          |   13 +++++++
>  drivers/media/video/v4l2-subdev.c         |    6 +++
>  include/media/v4l2-subdev.h               |    2 +
>  4 files changed, 78 insertions(+)
>
> diff --git a/drivers/media/video/v4l2-compat-ioctl32.c
> b/drivers/media/video/v4l2-compat-ioctl32.c
> index 9ebd5c5..e843705 100644
> --- a/drivers/media/video/v4l2-compat-ioctl32.c
> +++ b/drivers/media/video/v4l2-compat-ioctl32.c
> @@ -16,6 +16,7 @@
>  #include <linux/compat.h>
>  #include <linux/module.h>
>  #include <linux/videodev2.h>
> +#include <linux/v4l2-subdev.h>
>  #include <media/v4l2-dev.h>
>  #include <media/v4l2-ioctl.h>
>
> @@ -729,6 +730,44 @@ static int put_v4l2_event32(struct v4l2_event *kp,
> struct v4l2_event32 __user *u
>  	return 0;
>  }
>
> +struct v4l2_subdev_edid32 {
> +	__u32 pad;
> +	__u32 start_block;
> +	__u32 blocks;
> +	__u32 reserved[5];
> +	compat_caddr_t edid;
> +};
> +
> +static int get_v4l2_subdev_edid32(struct v4l2_subdev_edid *kp, struct
> v4l2_subdev_edid32 __user *up)
> +{
> +	u32 tmp;
> +
> +	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_subdev_edid32)) ||
> +		get_user(kp->pad, &up->pad) ||
> +		get_user(kp->start_block, &up->start_block) ||
> +		get_user(kp->blocks, &up->blocks) ||
> +		get_user(tmp, &up->edid) ||
> +		copy_from_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
> +			return -EFAULT;
> +	kp->edid = compat_ptr(tmp);
> +	return 0;
> +}
> +
> +static int put_v4l2_subdev_edid32(struct v4l2_subdev_edid *kp, struct
> v4l2_subdev_edid32 __user *up)
> +{
> +	u32 tmp = (u32)((unsigned long)kp->edid);
> +
> +	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_subdev_edid32)) ||
> +		put_user(kp->pad, &up->pad) ||
> +		put_user(kp->start_block, &up->start_block) ||
> +		put_user(kp->blocks, &up->blocks) ||
> +		put_user(tmp, &up->edid) ||
> +		copy_to_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
> +			return -EFAULT;
> +	return 0;
> +}
> +
> +
>  #define VIDIOC_G_FMT32		_IOWR('V',  4, struct v4l2_format32)
>  #define VIDIOC_S_FMT32		_IOWR('V',  5, struct v4l2_format32)
>  #define VIDIOC_QUERYBUF32	_IOWR('V',  9, struct v4l2_buffer32)
> @@ -738,6 +777,8 @@ static int put_v4l2_event32(struct v4l2_event *kp,
> struct v4l2_event32 __user *u
>  #define VIDIOC_DQBUF32		_IOWR('V', 17, struct v4l2_buffer32)
>  #define VIDIOC_ENUMSTD32	_IOWR('V', 25, struct v4l2_standard32)
>  #define VIDIOC_ENUMINPUT32	_IOWR('V', 26, struct v4l2_input32)
> +#define VIDIOC_SUBDEV_G_EDID32	_IOWR('V', 63, struct v4l2_subdev_edid32)
> +#define VIDIOC_SUBDEV_S_EDID32	_IOWR('V', 64, struct v4l2_subdev_edid32)
>  #define VIDIOC_TRY_FMT32      	_IOWR('V', 64, struct v4l2_format32)
>  #define VIDIOC_G_EXT_CTRLS32    _IOWR('V', 71, struct v4l2_ext_controls32)
>  #define VIDIOC_S_EXT_CTRLS32    _IOWR('V', 72, struct v4l2_ext_controls32)
> @@ -765,6 +806,7 @@ static long do_video_ioctl(struct file *file, unsigned
> int cmd, unsigned long ar
>  		struct v4l2_ext_controls v2ecs;
>  		struct v4l2_event v2ev;
>  		struct v4l2_create_buffers v2crt;
> +		struct v4l2_subdev_edid v2edid;
>  		unsigned long vx;
>  		int vi;
>  	} karg;
> @@ -797,6 +839,8 @@ static long do_video_ioctl(struct file *file, unsigned
> int cmd, unsigned long ar
>  	case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;
>  	case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
>  	case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break;
> +	case VIDIOC_SUBDEV_G_EDID32: cmd = VIDIOC_SUBDEV_G_EDID; break;
> +	case VIDIOC_SUBDEV_S_EDID32: cmd = VIDIOC_SUBDEV_S_EDID; break;
>  	}
>
>  	switch (cmd) {
> @@ -814,6 +858,12 @@ static long do_video_ioctl(struct file *file, unsigned
> int cmd, unsigned long ar
>  		compatible_arg = 0;
>  		break;
>
> +	case VIDIOC_SUBDEV_G_EDID:
> +	case VIDIOC_SUBDEV_S_EDID:
> +		err = get_v4l2_subdev_edid32(&karg.v2edid, up);
> +		compatible_arg = 0;
> +		break;
> +
>  	case VIDIOC_G_FMT:
>  	case VIDIOC_S_FMT:
>  	case VIDIOC_TRY_FMT:
> @@ -906,6 +956,11 @@ static long do_video_ioctl(struct file *file, unsigned
> int cmd, unsigned long ar
>  		err = put_v4l2_event32(&karg.v2ev, up);
>  		break;
>
> +	case VIDIOC_SUBDEV_G_EDID:
> +	case VIDIOC_SUBDEV_S_EDID:
> +		err = put_v4l2_subdev_edid32(&karg.v2edid, up);
> +		break;
> +
>  	case VIDIOC_G_FMT:
>  	case VIDIOC_S_FMT:
>  	case VIDIOC_TRY_FMT:
> @@ -1026,6 +1081,8 @@ long v4l2_compat_ioctl32(struct file *file, unsigned
> int cmd, unsigned long arg)
>  	case VIDIOC_QUERY_DV_TIMINGS:
>  	case VIDIOC_DV_TIMINGS_CAP:
>  	case VIDIOC_ENUM_FREQ_BANDS:
> +	case VIDIOC_SUBDEV_G_EDID32:
> +	case VIDIOC_SUBDEV_S_EDID32:
>  		ret = do_video_ioctl(file, cmd, arg);
>  		break;
>
> diff --git a/drivers/media/video/v4l2-ioctl.c
> b/drivers/media/video/v4l2-ioctl.c
> index c3b7b5f..1400f98 100644
> --- a/drivers/media/video/v4l2-ioctl.c
> +++ b/drivers/media/video/v4l2-ioctl.c
> @@ -2185,6 +2185,19 @@ static int check_array_args(unsigned int cmd, void
> *parg, size_t *array_size,
>  		break;
>  	}
>
> +	case VIDIOC_SUBDEV_G_EDID:
> +	case VIDIOC_SUBDEV_S_EDID: {
> +		struct v4l2_subdev_edid *edid = parg;
> +
> +		if (edid->blocks) {
> +			*user_ptr = (void __user *)edid->edid;
> +			*kernel_ptr = (void *)&edid->edid;
> +			*array_size = edid->blocks * 128;
> +			ret = 1;
> +		}
> +		break;
> +	}
> +
>  	case VIDIOC_S_EXT_CTRLS:
>  	case VIDIOC_G_EXT_CTRLS:
>  	case VIDIOC_TRY_EXT_CTRLS: {
> diff --git a/drivers/media/video/v4l2-subdev.c
> b/drivers/media/video/v4l2-subdev.c
> index 9182f81..dced41c 100644
> --- a/drivers/media/video/v4l2-subdev.c
> +++ b/drivers/media/video/v4l2-subdev.c
> @@ -348,6 +348,12 @@ static long subdev_do_ioctl(struct file *file, unsigned
> int cmd, void *arg)
>  		return v4l2_subdev_call(
>  			sd, pad, set_selection, subdev_fh, sel);
>  	}
> +
> +	case VIDIOC_SUBDEV_G_EDID:
> +		return v4l2_subdev_call(sd, pad, get_edid, arg);
> +
> +	case VIDIOC_SUBDEV_S_EDID:
> +		return v4l2_subdev_call(sd, pad, set_edid, arg);
>  #endif
>  	default:
>  		return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index c35a354..74c578f 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -476,6 +476,8 @@ struct v4l2_subdev_pad_ops {
>  			     struct v4l2_subdev_selection *sel);
>  	int (*set_selection)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
>  			     struct v4l2_subdev_selection *sel);
> +	int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid);
> +	int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid);
>  #ifdef CONFIG_MEDIA_CONTROLLER
>  	int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
>  			     struct v4l2_subdev_format *source_fmt,
> --
> 1.7.10.4
>
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