Re: [PATCH 1/5] media: staging: rkisp1: return IRQ_NONE in isr when irq isn't for ISP

[Helen Koike <helen.koike@collabora.com>]

Hi Dafna,

Thanks for the patch.

On 5/12/20 9:05 AM, Dafna Hirschfeld wrote:
> From: Helen Koike <helen.koike@collabora.com>
> 
> rkisp1 shares the interrupt line, then it shouldn't always return
> IRQ_HANDLED, otherwise it can flag as handled an interrupt that wans't
> meant for ISP.
> 
> return IRQ_NONE when the interrupt wans't meant for ISP
> 
> Fixes: d65dd85281fb ("media: staging: rkisp1: add Rockchip ISP1 base driver")
> 
> Signed-off-by: Helen Koike <helen.koike@collabora.com>
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
> ---
>  drivers/staging/media/rkisp1/rkisp1-capture.c |  7 ++++++-
>  drivers/staging/media/rkisp1/rkisp1-common.h  |  6 +++---
>  drivers/staging/media/rkisp1/rkisp1-dev.c     | 14 ++++++++++----
>  drivers/staging/media/rkisp1/rkisp1-isp.c     | 12 ++++++++----
>  4 files changed, 27 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/staging/media/rkisp1/rkisp1-capture.c b/drivers/staging/media/rkisp1/rkisp1-capture.c
> index f69235f82c45..19021875e8a9 100644
> --- a/drivers/staging/media/rkisp1/rkisp1-capture.c
> +++ b/drivers/staging/media/rkisp1/rkisp1-capture.c
> @@ -649,12 +649,15 @@ static void rkisp1_handle_buffer(struct rkisp1_capture *cap)
>  	rkisp1_set_next_buf(cap);
>  }
>  
> -void rkisp1_capture_isr(struct rkisp1_device *rkisp1)
> +irqreturn_t rkisp1_capture_isr(struct rkisp1_device *rkisp1)
>  {
>  	unsigned int i;
>  	u32 status;
>  
>  	status = rkisp1_read(rkisp1, RKISP1_CIF_MI_MIS);
> +	if (!status)
> +		return IRQ_NONE;
> +
>  	rkisp1_write(rkisp1, status, RKISP1_CIF_MI_ICR);
>  
>  	for (i = 0; i < ARRAY_SIZE(rkisp1->capture_devs); ++i) {
> @@ -682,6 +685,8 @@ void rkisp1_capture_isr(struct rkisp1_device *rkisp1)
>  		cap->is_streaming = false;
>  		wake_up(&cap->done);
>  	}
> +
> +	return IRQ_HANDLED;
>  }
>  
>  /* ----------------------------------------------------------------------------
> diff --git a/drivers/staging/media/rkisp1/rkisp1-common.h b/drivers/staging/media/rkisp1/rkisp1-common.h
> index 0c4fe503adc9..33dffe21c769 100644
> --- a/drivers/staging/media/rkisp1/rkisp1-common.h
> +++ b/drivers/staging/media/rkisp1/rkisp1-common.h
> @@ -305,9 +305,9 @@ void rkisp1_isp_unregister(struct rkisp1_device *rkisp1);
>  
>  const struct rkisp1_isp_mbus_info *rkisp1_isp_mbus_info_get(u32 mbus_code);
>  
> -void rkisp1_isp_isr(struct rkisp1_device *rkisp1);
> -void rkisp1_mipi_isr(struct rkisp1_device *rkisp1);
> -void rkisp1_capture_isr(struct rkisp1_device *rkisp1);
> +irqreturn_t rkisp1_isp_isr(struct rkisp1_device *rkisp1);
> +irqreturn_t rkisp1_mipi_isr(struct rkisp1_device *rkisp1);
> +irqreturn_t rkisp1_capture_isr(struct rkisp1_device *rkisp1);
>  void rkisp1_stats_isr(struct rkisp1_stats *stats, u32 isp_ris);
>  void rkisp1_params_isr(struct rkisp1_device *rkisp1, u32 isp_mis);
>  
> diff --git a/drivers/staging/media/rkisp1/rkisp1-dev.c b/drivers/staging/media/rkisp1/rkisp1-dev.c
> index 9ac38bafb839..b7f43dab71c8 100644
> --- a/drivers/staging/media/rkisp1/rkisp1-dev.c
> +++ b/drivers/staging/media/rkisp1/rkisp1-dev.c
> @@ -387,10 +387,13 @@ static int rkisp1_entities_register(struct rkisp1_device *rkisp1)
>  	return ret;
>  }
>  
> -static irqreturn_t rkisp1_isr(int irq, void *ctx)
> +irqreturn_t rkisp1_isr(int irq, void *ctx)
>  {
>  	struct device *dev = ctx;
>  	struct rkisp1_device *rkisp1 = dev_get_drvdata(dev);
> +	irqreturn_t isp_ret;
> +	irqreturn_t cap_ret;
> +	irqreturn_t mipi_ret;

Just cosmetics, you could declare them in a single line

	irqreturn_t cap_ret, isp_ret, mipi_ret;

With or without this change:

Acked-by: Helen Koike <helen.koike@collabora.com>

Thanks
Helen

>  
>  	/*
>  	 * Call rkisp1_capture_isr() first to handle the frame that
> @@ -398,9 +401,12 @@ static irqreturn_t rkisp1_isr(int irq, void *ctx)
>  	 * it is potentially incremented by rkisp1_isp_isr() in the vertical
>  	 * sync.
>  	 */
> -	rkisp1_capture_isr(rkisp1);
> -	rkisp1_isp_isr(rkisp1);
> -	rkisp1_mipi_isr(rkisp1);
> +	cap_ret = rkisp1_capture_isr(rkisp1);
> +	isp_ret = rkisp1_isp_isr(rkisp1);
> +	mipi_ret = rkisp1_mipi_isr(rkisp1);
> +
> +	if (isp_ret == IRQ_NONE && cap_ret == IRQ_NONE && mipi_ret == IRQ_NONE)
> +		return IRQ_NONE;
>  
>  	return IRQ_HANDLED;
>  }
> diff --git a/drivers/staging/media/rkisp1/rkisp1-isp.c b/drivers/staging/media/rkisp1/rkisp1-isp.c
> index dc2b59a0160a..19ab0ed323aa 100644
> --- a/drivers/staging/media/rkisp1/rkisp1-isp.c
> +++ b/drivers/staging/media/rkisp1/rkisp1-isp.c
> @@ -1046,13 +1046,13 @@ void rkisp1_isp_unregister(struct rkisp1_device *rkisp1)
>   * Interrupt handlers
>   */
>  
> -void rkisp1_mipi_isr(struct rkisp1_device *rkisp1)
> +irqreturn_t rkisp1_mipi_isr(struct rkisp1_device *rkisp1)
>  {
>  	u32 val, status;
>  
>  	status = rkisp1_read(rkisp1, RKISP1_CIF_MIPI_MIS);
>  	if (!status)
> -		return;
> +		return IRQ_NONE;
>  
>  	rkisp1_write(rkisp1, status, RKISP1_CIF_MIPI_ICR);
>  
> @@ -1087,6 +1087,8 @@ void rkisp1_mipi_isr(struct rkisp1_device *rkisp1)
>  	} else {
>  		rkisp1->debug.mipi_error++;
>  	}
> +
> +	return IRQ_HANDLED;
>  }
>  
>  static void rkisp1_isp_queue_event_sof(struct rkisp1_isp *isp)
> @@ -1106,13 +1108,13 @@ static void rkisp1_isp_queue_event_sof(struct rkisp1_isp *isp)
>  	v4l2_event_queue(isp->sd.devnode, &event);
>  }
>  
> -void rkisp1_isp_isr(struct rkisp1_device *rkisp1)
> +irqreturn_t rkisp1_isp_isr(struct rkisp1_device *rkisp1)
>  {
>  	u32 status, isp_err;
>  
>  	status = rkisp1_read(rkisp1, RKISP1_CIF_ISP_MIS);
>  	if (!status)
> -		return;
> +		return IRQ_NONE;
>  
>  	rkisp1_write(rkisp1, status, RKISP1_CIF_ISP_ICR);
>  
> @@ -1148,4 +1150,6 @@ void rkisp1_isp_isr(struct rkisp1_device *rkisp1)
>  	 * Do the updates in the order of the processing flow.
>  	 */
>  	rkisp1_params_isr(rkisp1, status);
> +
> +	return IRQ_HANDLED;
>  }
>