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@xxxxxxxxxxx>
> ---
> 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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