Re: [PATCH v4 05/10] drm/rcar-du/crc: Implement verify_crc_source callback

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

Hi Mahesh,

Thank you for the patch.

On Friday, 13 July 2018 16:59:37 EEST Mahesh Kumar wrote:
> This patch implements "verify_crc_source" callback function for
> rcar drm driver.
> 
> Changes Since V1:
>  - avoid duplication of code
> Changes Since V2:
>  - further optimize the code
> 
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 71 +++++++++++++++++++++----------
>  1 file changed, 51 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index 15dc9caa128b..dfbba1acc31f
> 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -756,17 +756,11 @@ static void rcar_du_crtc_disable_vblank(struct
> drm_crtc *crtc) rcrtc->vblank_enable = false;
>  }
> 
> -static int rcar_du_crtc_set_crc_source(struct drm_crtc *crtc,
> -				       const char *source_name,
> -				       size_t *values_cnt)
> +static int rcar_du_crtc_parse_crc_source(struct rcar_du_crtc *rcrtc,
> +					 const char *source_name,
> +					 enum vsp1_du_crc_source *s)

I'd name the parameter source, it's more explicit.

>  {
> -	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> -	struct drm_modeset_acquire_ctx ctx;
> -	struct drm_crtc_state *crtc_state;
> -	struct drm_atomic_state *state;
> -	enum vsp1_du_crc_source source;
> -	unsigned int index = 0;
> -	unsigned int i;
> +	unsigned int index;
>  	int ret;
> 
>  	/*
> @@ -774,30 +768,66 @@ static int rcar_du_crtc_set_crc_source(struct drm_crtc
> *crtc, * CRC on an input plane (%u is the plane ID), and "auto" to compute
> the * CRC on the composer (VSP) output.
>  	 */
> +
>  	if (!source_name) {
> -		source = VSP1_DU_CRC_NONE;
> +		*s = VSP1_DU_CRC_NONE;
> +		return 0;
>  	} else if (!strcmp(source_name, "auto")) {
> -		source = VSP1_DU_CRC_OUTPUT;
> +		*s = VSP1_DU_CRC_OUTPUT;
> +		return 0;
>  	} else if (strstarts(source_name, "plane")) {
> -		source = VSP1_DU_CRC_PLANE;
> +		unsigned int i;
> +
> +		*s = VSP1_DU_CRC_PLANE;
> 
>  		ret = kstrtouint(source_name + strlen("plane"), 10, &index);
>  		if (ret < 0)
>  			return ret;
> 
> -		for (i = 0; i < rcrtc->vsp->num_planes; ++i) {
> -			if (index == rcrtc->vsp->planes[i].plane.base.id) {
> -				index = i;
> -				break;
> -			}
> -		}
> +		for (i = 0; i < rcrtc->vsp->num_planes; ++i)
> +			if (index == rcrtc->vsp->planes[i].plane.base.id)
> +				return i;

Please use braces for the outer for loop. Even if not strictly required by the 
C language, it matches the style of the driver.

>  		if (i >= rcrtc->vsp->num_planes)
>  			return -EINVAL;

Won't this check always be true ? You can return -EINVAL unconditionally here.

> -	} else {
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int rcar_du_crtc_verify_crc_source(struct drm_crtc *crtc,
> +					  const char *source_name,
> +					  size_t *values_cnt)
> +{
> +	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +	enum vsp1_du_crc_source source;
> +
> +	if (rcar_du_crtc_parse_crc_source(rcrtc, source_name, &source) < 0) {
> +		DRM_DEBUG_DRIVER("unknown source %s\n", source_name);
>  		return -EINVAL;
>  	}
> 
> +	*values_cnt = 1;
> +	return 0;
> +}
> +
> +static int rcar_du_crtc_set_crc_source(struct drm_crtc *crtc,
> +				       const char *source_name,
> +				       size_t *values_cnt)
> +{
> +	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +	struct drm_modeset_acquire_ctx ctx;
> +	struct drm_crtc_state *crtc_state;
> +	struct drm_atomic_state *state;
> +	enum vsp1_du_crc_source source;
> +	unsigned int index = 0;

No need to initialize index to 0.

With those small issues fixed,

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

> +	int ret;
> +
> +	ret = rcar_du_crtc_parse_crc_source(rcrtc, source_name, &source);
> +	if (ret < 0)
> +		return ret;
> +
> +	index = ret;
>  	*values_cnt = 1;
> 
>  	/* Perform an atomic commit to set the CRC source. */
> @@ -861,6 +891,7 @@ static const struct drm_crtc_funcs crtc_funcs_gen3 = {
>  	.enable_vblank = rcar_du_crtc_enable_vblank,
>  	.disable_vblank = rcar_du_crtc_disable_vblank,
>  	.set_crc_source = rcar_du_crtc_set_crc_source,
> +	.verify_crc_source = rcar_du_crtc_verify_crc_source,
>  };
> 
>  /*
> ---------------------------------------------------------------------------

-- 
Regards,

Laurent Pinchart



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