Re: [PATCH v5 10/10] drm/rcar-du/crc: Implement get_crc_sources callback

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Mahesh,

Thank you for the patch.

On Monday, 23 July 2018 13:44:51 EEST Mahesh Kumar wrote:
> This patch implements get_crc_sources callback, which returns list of
> all the crc sources supported by driver in current platform.
> 
> Changes Since V1:
>  - move sources list per-crtc
>  - init sources-list only for gen3
> Changes Since V2:
>  - Adopt to driver style
>  - Address other review comments from Laurent Pinchart

I'm pretty sure this has changed since v4 as well.

> Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 85 ++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.h |  3 ++
>  2 files changed, 87 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index 43e67cffdee0..39981ce422e1
> 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -691,6 +691,68 @@ static const struct drm_crtc_helper_funcs
> crtc_helper_funcs = {
>  	.atomic_disable = rcar_du_crtc_atomic_disable,
>  };
> 
> +static void rcar_du_crtc_crc_sources_list_init(struct rcar_du_crtc *rcrtc)

Let's shorten the function name to rcar_du_crtc_crc_init().

> +{
> +	struct rcar_du_device *rcdu = rcrtc->group->dev;
> +	const char **sources;
> +	unsigned int count;
> +	int i = -1;
> +
> +	/* CRC available only on Gen3 HW. */
> +	if (rcdu->info->gen < 3)
> +		return;
> +
> +	/* Reserve 1 for "auto" source. */
> +	count = rcrtc->vsp->num_planes + 1;
> +
> +	sources = kmalloc_array(count, sizeof(*sources), GFP_KERNEL);
> +	if (!sources)
> +		return;
> +
> +	sources[0] = kstrdup("auto", GFP_KERNEL);
> +	if (!sources[0])
> +		goto error;
> +
> +	for (i = 0; i < rcrtc->vsp->num_planes; ++i) {
> +		struct drm_plane *plane = &rcrtc->vsp->planes[i].plane;
> +		char name[16];
> +
> +		sprintf(name, "plane%u", plane->base.id);
> +		sources[i + 1] = kstrdup(name, GFP_KERNEL);
> +		if (!sources[i + 1])
> +			goto error;
> +	}
> +
> +	rcrtc->sources = sources;
> +	rcrtc->sources_count = count;
> +	return;
> +
> +error:
> +	while (i >= 0) {
> +		kfree(sources[i]);
> +		i--;
> +	}
> +	kfree(sources);
> +
> +	rcrtc->sources = NULL;
> +	rcrtc->sources_count = 0;

The two last lines are not needed as ->sources and ->sources_count are only 
initialized at the very end of the function if no error occurred.

> +}
> +
> +static void rcar_du_crtc_crc_sources_list_uninit(struct rcar_du_crtc
> *rcrtc)

Similarly, and for consistency as the driver uses the _cleanup suffix 
throughout the code, I would name this rcar_du_crtc_crc_cleanup().

With those three small changes,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +{
> +	unsigned int i;
> +
> +	if (!rcrtc->sources)
> +		return;
> +
> +	for (i = 0; i < rcrtc->sources_count; i++)
> +		kfree(rcrtc->sources[i]);
> +	kfree(rcrtc->sources);
> +
> +	rcrtc->sources = NULL;
> +	rcrtc->sources_count = 0;
> +}

-- 
Regards,

Laurent Pinchart



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