Op 27-06-18 om 16:44 schreef Mahesh Kumar:
> This patch implements a callback function "pre_crc_read" which will
> be called before crc read. In this function driver can implement and
> preparation work required for successfully reading CRC data.
>
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> ---
> drivers/gpu/drm/drm_debugfs_crc.c | 8 ++++++++
> include/drm/drm_crtc.h | 14 ++++++++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
> index c6a725b79ac6..2b4a737c5aeb 100644
> --- a/drivers/gpu/drm/drm_debugfs_crc.c
> +++ b/drivers/gpu/drm/drm_debugfs_crc.c
> @@ -278,6 +278,14 @@ static ssize_t crtc_crc_read(struct file *filep, char __user *user_buf,
> return 0;
> }
>
> + if (crtc->funcs->pre_crc_read) {
> + ret = crtc->funcs->pre_crc_read(crtc);
> + if (ret) {
> + spin_unlock_irq(&crc->lock);
> + return ret;
> + }
> + }
> +
> /* Nothing to read? */
> while (crtc_crc_data_count(crc) == 0) {
> if (filep->f_flags & O_NONBLOCK) {
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 1a6dcbf91744..bae432469616 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -676,6 +676,20 @@ struct drm_crtc_funcs {
> */
> int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
> size_t *values_cnt);
> + /**
> + * @pre_crc_read:
> + *
> + * Driver callback for performing any preparation work required by
> + * driver before reading CRC
> + *
> + * This callback is optional if the driver does not support CRC
> + * generation or no prework is required before reading the crc
> + *
> + * RETURNS:
> + *
> + * 0 on success or a negative error code on failure.
> + */
> + int (*pre_crc_read)(struct drm_crtc *crtc);
>
> /**
> * @atomic_print_state:
I think this patch might have to be dropped, or reordered after the revert in 10/10, because else in theory open could block. :)
Or maybe just drop until we have upstream kernel users?
~Maarten
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