Hi Mahesh,
Thank you for the patch.
On Monday, 2 July 2018 14:07:21 EEST Mahesh Kumar wrote:
> This patch introduce a callback function "get_crc_sources" which
> will be called during read of control node. It is an optional
> callback function and if driver implements this callback, driver
> should print list of available CRC sources in seq_file privided
> as an input to the callback.
The commit message seems to be outdated, the callback doesn't take a seq_file
anymore.
> Changes Since V1: (Daniel)
> - return const pointer to an array of crc sources list
> - do validation of sources in CRC-core
>
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_debugfs_crc.c | 20 +++++++++++++++++++-
> include/drm/drm_crtc.h | 16 ++++++++++++++++
> 2 files changed, 35 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_debugfs_crc.c
> b/drivers/gpu/drm/drm_debugfs_crc.c index c6a725b79ac6..f4d76528d24c 100644
> --- a/drivers/gpu/drm/drm_debugfs_crc.c
> +++ b/drivers/gpu/drm/drm_debugfs_crc.c
> @@ -67,9 +67,27 @@
> static int crc_control_show(struct seq_file *m, void *data)
> {
> struct drm_crtc *crtc = m->private;
> + size_t count;
Count it only used within the if () {} block, you can declare it there.
> +
> + if (crtc->funcs->get_crc_sources) {
> + const char *const *sources = crtc->funcs->get_crc_sources(crtc,
> + &count);
> + size_t values_cnt;
> + int i;
I only takes positive values, it can be an unsigned int.
> +
> + if (count <= 0 || !sources)
count is a size_t, it can't be negative.
The .get_crc_sources() documentation doesn't clearly specify whether sources
should always be NULL when count is zero. I advise updating the documentation,
and possibly updating this check accordingly.
> + goto out;
> +
> + seq_puts(m, "[");
> + for (i = 0; i < count; i++)
> + if (!crtc->funcs->verify_crc_source(crtc, sources[i],
> + &values_cnt))
I assume that you verify sources one by one here to avoid having to create a
list of sources dynamically in the .get_crc_sources() callback ? If so, I
think the .get_crc_sources() callback should document that.
You should also document that .verify_crc_source() is required when
get_crc_sources() is provided.
> + seq_printf(m, "%s ", sources[i]);
> + seq_puts(m, "] ");
This assumes that source names can't include a space. Isn't that too
restrictive ? Shouldn't a different separator be used ? How about one source
name per line ?
Additionally, shouldn't the active source be marked ?
> + }
>
> +out:
> seq_printf(m, "%s\n", crtc->crc.source);
> -
> return 0;
> }
>
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 1a6dcbf91744..ffaec138aeee 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -676,6 +676,22 @@ struct drm_crtc_funcs {
> */
> int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
> size_t *values_cnt);
> + /**
> + * @get_crc_sources:
> + *
> + * Driver callback for getting a list of all the available sources for
> + * CRC generation.
> + *
> + * This callback is optional if the driver does not support exporting of
> + * possible CRC sources list. CRC-core does the verification of sources.
> + *
> + * RETURNS:
> + *
> + * a constant character pointer to the list of all the available CRC
> + * sources
> + */
> + const char *const *(*get_crc_sources)(struct drm_crtc *crtc,
> + size_t *count);
>
> /**
> * @atomic_print_state:
--
Regards,
Laurent Pinchart
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