On Wed, Aug 22, 2018 at 12:37:05PM +0200, Maarten Lankhorst wrote:
> Op 21-08-18 om 10:38 schreef Mahesh Kumar:
> > 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@lists.freedesktop.org
> > Signed-off-by: Mahesh Kumar <mahesh1.ku...@intel.com>
> After some discussion with David on whether this can be upstreamed, he NACK'd
> it.
> Because there are no upstream users for this callback, it cannot be included
> upstream.
> It would be removed by the first person to notice there are no in-kernel
> users using it.
It makes sense.... After I posted the review yesterday I started thinking
exactly
about this case... if would get easily removed in a clean-up for obvious
reasons...
> For the first 3 patches:
> Reviewed-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
thanks. pushed all 3 to drm-misc-next.
> > 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:
> > *
>
>
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