On Tue, Aug 21, 2018 at 02:08:58PM +0530, Mahesh Kumar wrote:
> This patch implements a callback function which will be called before
> crc read. In this function driver can implement any preparation work
> required for successfully reading CRC data.
>
> Changes Since V1:
> - rebase
>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> ---
> 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 00e743153e94..e303c194c080 100644
> --- a/drivers/gpu/drm/drm_debugfs_crc.c
> +++ b/drivers/gpu/drm/drm_debugfs_crc.c
> @@ -274,6 +274,14 @@ 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 b21437bc95bf..19c2bf63935e 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -761,6 +761,20 @@ 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);
> /**
> * @get_crc_sources:
> *
> --
> 2.16.2
>
> _______________________________________________
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> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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