linux-kernel - Re: [PATCH 14/15] drm/exynos/fimc: simplify buffer queuing

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Message-id: <53FC20EC.7070209@samsung.com>
Date:	Tue, 26 Aug 2014 14:53:48 +0900
From:	Joonyoung Shim <jy0922.shim@...sung.com>
To:	Andrzej Hajda <a.hajda@...sung.com>,
	Inki Dae <inki.dae@...sung.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	dri-devel@...ts.freedesktop.org,
	open list <linux-kernel@...r.kernel.org>,
	"moderated list:ARM/S5P EXYNOS AR..." 
	<linux-samsung-soc@...r.kernel.org>,
	Joonyoung Shim <jy0922.shim@...sung.com>
Subject: Re: [PATCH 14/15] drm/exynos/fimc: simplify buffer queuing

Hi Andrzej,

On 08/22/2014 04:52 PM, Andrzej Hajda wrote:
> The patch removes redundant checks, redundant HW reads
> and simplifies code.
> 
> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_fimc.c | 64 ++++++++------------------------
>  1 file changed, 15 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> index bd6628d..b20078e 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
> @@ -1124,67 +1124,34 @@ static int fimc_dst_set_size(struct device *dev, int swap,
>  	return 0;
>  }
>  
> -static int fimc_dst_get_buf_count(struct fimc_context *ctx)
> -{
> -	u32 cfg, buf_num;
> -
> -	cfg = fimc_read(ctx, EXYNOS_CIFCNTSEQ);
> -
> -	buf_num = hweight32(cfg);
> -
> -	DRM_DEBUG_KMS("buf_num[%d]\n", buf_num);
> -
> -	return buf_num;
> -}
> -
> -static int fimc_dst_set_buf_seq(struct fimc_context *ctx, u32 buf_id,
> +static void fimc_dst_set_buf_seq(struct fimc_context *ctx, u32 buf_id,
>  		enum drm_exynos_ipp_buf_type buf_type)
>  {
> -	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
> -	bool enable;
> -	u32 cfg;
> -	u32 mask = 0x00000001 << buf_id;
> -	int ret = 0;
>  	unsigned long flags;
> +	u32 buf_num;
> +	u32 cfg;
>  
>  	DRM_DEBUG_KMS("buf_id[%d]buf_type[%d]\n", buf_id, buf_type);
>  
>  	spin_lock_irqsave(&ctx->lock, flags);
>  
> -	/* mask register set */
>  	cfg = fimc_read(ctx, EXYNOS_CIFCNTSEQ);
>  
> -	switch (buf_type) {
> -	case IPP_BUF_ENQUEUE:
> -		enable = true;
> -		break;
> -	case IPP_BUF_DEQUEUE:
> -		enable = false;
> -		break;
> -	default:
> -		dev_err(ippdrv->dev, "invalid buf ctrl parameter.\n");
> -		ret =  -EINVAL;
> -		goto err_unlock;
> -	}
> +	if (buf_type == IPP_BUF_ENQUEUE)
> +		cfg |= (1 << buf_id);
> +	else
> +		cfg &= (1 << buf_id);

~ Missing?

>  
> -	/* sequence id */
> -	cfg &= ~mask;
> -	cfg |= (enable << buf_id);
>  	fimc_write(ctx, cfg, EXYNOS_CIFCNTSEQ);
>  
> -	/* interrupt enable */
> -	if (buf_type == IPP_BUF_ENQUEUE &&
> -	    fimc_dst_get_buf_count(ctx) >= FIMC_BUF_START)
> -		fimc_mask_irq(ctx, true);
> +	buf_num = hweight32(cfg);
>  
> -	/* interrupt disable */
> -	if (buf_type == IPP_BUF_DEQUEUE &&
> -	    fimc_dst_get_buf_count(ctx) <= FIMC_BUF_STOP)
> +	if (buf_type == IPP_BUF_ENQUEUE && buf_num >= FIMC_BUF_START)
> +		fimc_mask_irq(ctx, true);
> +	else if (buf_type == IPP_BUF_DEQUEUE && buf_num <= FIMC_BUF_STOP)
>  		fimc_mask_irq(ctx, false);
>  
> -err_unlock:
>  	spin_unlock_irqrestore(&ctx->lock, flags);
> -	return ret;
>  }
>  
>  static int fimc_dst_set_addr(struct device *dev,
> @@ -1242,7 +1209,9 @@ static int fimc_dst_set_addr(struct device *dev,
>  		break;
>  	}
>  
> -	return fimc_dst_set_buf_seq(ctx, buf_id, buf_type);
> +	fimc_dst_set_buf_seq(ctx, buf_id, buf_type);
> +
> +	return 0;
>  }
>  
>  static struct exynos_drm_ipp_ops fimc_dst_ops = {
> @@ -1297,10 +1266,7 @@ static irqreturn_t fimc_irq_handler(int irq, void *dev_id)
>  
>  	DRM_DEBUG_KMS("buf_id[%d]\n", buf_id);
>  
> -	if (fimc_dst_set_buf_seq(ctx, buf_id, IPP_BUF_DEQUEUE) < 0) {
> -		DRM_ERROR("failed to dequeue.\n");
> -		return IRQ_HANDLED;
> -	}
> +	fimc_dst_set_buf_seq(ctx, buf_id, IPP_BUF_DEQUEUE);
>  
>  	event_work->ippdrv = ippdrv;
>  	event_work->buf_id[EXYNOS_DRM_OPS_DST] = buf_id;
> 

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