[PATCH] media: aspeed: clear garbage interrupts

[Eddie James]

On 9/26/19 5:27 PM, Jae Hyun Yoo wrote:
> From: Jae Hyun Yoo <jae.hyun.yoo at intel.com>
>
> CAPTURE_COMPLETE and FRAME_COMPLETE interrupts come even when these
> are disabled in the VE_INTERRUPT_CTRL register and eventually this
> behavior causes disabling irq itself like below:


Thanks!

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


>
> [10055.108784] irq 23: nobody cared (try booting with the "irqpoll" option)
> [10055.115525] CPU: 0 PID: 331 Comm: swampd Tainted: G        W         5.3.0-4fde000-dirty-d683e2e #1
> [10055.124565] Hardware name: Generic DT based system
> [10055.129355] Backtrace:
> [10055.131854] [<80107d7c>] (dump_backtrace) from [<80107fb0>] (show_stack+0x20/0x24)
> [10055.139431]  r7:00000017 r6:00000001 r5:00000000 r4:9d51dc00
> [10055.145120] [<80107f90>] (show_stack) from [<8074bf50>] (dump_stack+0x20/0x28)
> [10055.152361] [<8074bf30>] (dump_stack) from [<80150ffc>] (__report_bad_irq+0x40/0xc0)
> [10055.160109] [<80150fbc>] (__report_bad_irq) from [<80150f2c>] (note_interrupt+0x23c/0x294)
> [10055.168374]  r9:015b6e60 r8:00000000 r7:00000017 r6:00000001 r5:00000000 r4:9d51dc00
> [10055.176136] [<80150cf0>] (note_interrupt) from [<8014df1c>] (handle_irq_event_percpu+0x88/0x98)
> [10055.184835]  r10:7eff7910 r9:015b6e60 r8:00000000 r7:9d417600 r6:00000001 r5:00000002
> [10055.192657]  r4:9d51dc00 r3:00000000
> [10055.196248] [<8014de94>] (handle_irq_event_percpu) from [<8014df64>] (handle_irq_event+0x38/0x4c)
> [10055.205113]  r5:80b56d50 r4:9d51dc00
> [10055.208697] [<8014df2c>] (handle_irq_event) from [<80151f1c>] (handle_level_irq+0xbc/0x12c)
> [10055.217037]  r5:80b56d50 r4:9d51dc00
> [10055.220623] [<80151e60>] (handle_level_irq) from [<8014d4b8>] (generic_handle_irq+0x30/0x44)
> [10055.229052]  r5:80b56d50 r4:00000017
> [10055.232648] [<8014d488>] (generic_handle_irq) from [<8014d524>] (__handle_domain_irq+0x58/0xb4)
> [10055.241356] [<8014d4cc>] (__handle_domain_irq) from [<801021e4>] (avic_handle_irq+0x68/0x70)
> [10055.249797]  r9:015b6e60 r8:00c5387d r7:00c5387d r6:ffffffff r5:9dd33fb0 r4:9d402380
> [10055.257539] [<8010217c>] (avic_handle_irq) from [<80101e34>] (__irq_usr+0x54/0x80)
> [10055.265105] Exception stack(0x9dd33fb0 to 0x9dd33ff8)
> [10055.270152] 3fa0:                                     015d0530 00000000 00000000 015d0538
> [10055.278328] 3fc0: 015d0530 015b6e60 00000000 00000000 0052c5d0 015b6e60 7eff7910 7eff7918
> [10055.286496] 3fe0: 76ce5614 7eff7908 0050e2f4 76a3a08c 20000010 ffffffff
> [10055.293104]  r5:20000010 r4:76a3a08c
> [10055.296673] handlers:
> [10055.298967] [<79f218a5>] irq_default_primary_handler threaded [<1de88514>] aspeed_video_irq
> [10055.307344] Disabling IRQ #23
>
> To fix this issue, this commit makes the interrupt handler clear
> these garbage interrupts. This driver enables and uses only
> COMP_COMPLETE interrupt instead for frame handling.
>
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at intel.com>
> ---
>   drivers/media/platform/aspeed-video.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index eb12f3793062..e842f99d20a9 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -606,6 +606,16 @@ static irqreturn_t aspeed_video_irq(int irq, void *arg)
>   			aspeed_video_start_frame(video);
>   	}
>   
> +	/*
> +	 * CAPTURE_COMPLETE and FRAME_COMPLETE interrupts come even when these
> +	 * are disabled in the VE_INTERRUPT_CTRL register so clear them to
> +	 * prevent unnecessary interrupt calls.
> +	 */
> +	if (sts & VE_INTERRUPT_CAPTURE_COMPLETE)
> +		sts &= ~VE_INTERRUPT_CAPTURE_COMPLETE;
> +	if (sts & VE_INTERRUPT_FRAME_COMPLETE)
> +		sts &= ~VE_INTERRUPT_FRAME_COMPLETE;
> +
>   	return sts ? IRQ_NONE : IRQ_HANDLED;
>   }
>