[PATCH 7/7] media: aspeed: refine interrupt handling logic

[Eddie James]

On 5/2/19 2:13 PM, Jae Hyun Yoo wrote:
> There are cases that interrupt bits are cleared by a 500ms delayed
> work which causes unnecessary irq calls. Also, the current
> interrupt handler returns IRQ_HANDLED always but it should return
> IRQ_NONE if there is any unhandled interrupt. So this commit
> refines the interrupt handling logic to fix these issues.


Thanks Jae, looks good.

Reviewed-by: Eddie James <eajames at linux.ibm.com>


>
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
> Reviewed-by: Andrew Jeffery <andrew at aj.id.au>
> ---
>   drivers/media/platform/aspeed-video.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index 8d0bb395e46d..98944a911998 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -488,6 +488,7 @@ static void aspeed_video_off(struct aspeed_video *video)
>   
>   	/* Disable interrupts */
>   	aspeed_video_write(video, VE_INTERRUPT_CTRL, 0);
> +	aspeed_video_write(video, VE_INTERRUPT_STATUS, 0xffffffff);
>   
>   	/* Turn off the relevant clocks */
>   	clk_disable(video->vclk);
> @@ -556,7 +557,7 @@ static irqreturn_t aspeed_video_irq(int irq, void *arg)
>   					    VE_INTERRUPT_MODE_DETECT, 0);
>   			aspeed_video_write(video, VE_INTERRUPT_STATUS,
>   					   VE_INTERRUPT_MODE_DETECT);
> -
> +			sts &= ~VE_INTERRUPT_MODE_DETECT;
>   			set_bit(VIDEO_MODE_DETECT_DONE, &video->flags);
>   			wake_up_interruptible_all(&video->wait);
>   		} else {
> @@ -601,12 +602,12 @@ static irqreturn_t aspeed_video_irq(int irq, void *arg)
>   				    VE_INTERRUPT_COMP_COMPLETE, 0);
>   		aspeed_video_write(video, VE_INTERRUPT_STATUS,
>   				   VE_INTERRUPT_COMP_COMPLETE);
> -
> +		sts &= ~VE_INTERRUPT_COMP_COMPLETE;
>   		if (test_bit(VIDEO_STREAMING, &video->flags) && buf)
>   			aspeed_video_start_frame(video);
>   	}
>   
> -	return IRQ_HANDLED;
> +	return sts ? IRQ_NONE : IRQ_HANDLED;
>   }
>   
>   static void aspeed_video_check_and_set_polarity(struct aspeed_video *video)