Re: [PATCH] accel/ivpu/37xx: Fix missing VPUIP interrupts

[Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>]

On Tue, Oct 24, 2023 at 06:19:52PM +0200, Stanislaw Gruszka wrote:
> From: Karol Wachowski <karol.wachowski@linux.intel.com>
> 
> Move sequence of masking and unmasking global interrupts from buttress
> interrupt handler to generic one that handles both VPUIP and BTRS
> interrupts. Unmasking global interrupts will re-trigger MSI for any
> pending interrupts.
> 
> Lack of this sequence will cause the driver to miss any
> VPUIP interrupt that comes after reading VPU_37XX_HOST_SS_ICB_STATUS_0
> and before clearing all active interrupt sources.
> 
> Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Added:

Fixes: 35b137630f08 ("accel/ivpu: Introduce a new DRM driver for Intel VPU")
Cc: stable@vger.kernel.org

and applied to drm-misc-fixes

Thanks
Stanislaw

> ---
>  drivers/accel/ivpu/ivpu_hw_37xx.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/accel/ivpu/ivpu_hw_37xx.c b/drivers/accel/ivpu/ivpu_hw_37xx.c
> index 7e4e87aa7602..5c0246b9e522 100644
> --- a/drivers/accel/ivpu/ivpu_hw_37xx.c
> +++ b/drivers/accel/ivpu/ivpu_hw_37xx.c
> @@ -906,9 +906,6 @@ static u32 ivpu_hw_37xx_irqb_handler(struct ivpu_device *vdev, int irq)
>  	if (status == 0)
>  		return 0;
>  
> -	/* Disable global interrupt before handling local buttress interrupts */
> -	REGB_WR32(VPU_37XX_BUTTRESS_GLOBAL_INT_MASK, 0x1);
> -
>  	if (REG_TEST_FLD(VPU_37XX_BUTTRESS_INTERRUPT_STAT, FREQ_CHANGE, status))
>  		ivpu_dbg(vdev, IRQ, "FREQ_CHANGE irq: %08x",
>  			 REGB_RD32(VPU_37XX_BUTTRESS_CURRENT_PLL));
> @@ -940,9 +937,6 @@ static u32 ivpu_hw_37xx_irqb_handler(struct ivpu_device *vdev, int irq)
>  	else
>  		REGB_WR32(VPU_37XX_BUTTRESS_INTERRUPT_STAT, status);
>  
> -	/* Re-enable global interrupt */
> -	REGB_WR32(VPU_37XX_BUTTRESS_GLOBAL_INT_MASK, 0x0);
> -
>  	if (schedule_recovery)
>  		ivpu_pm_schedule_recovery(vdev);
>  
> @@ -954,9 +948,14 @@ static irqreturn_t ivpu_hw_37xx_irq_handler(int irq, void *ptr)
>  	struct ivpu_device *vdev = ptr;
>  	u32 ret_irqv, ret_irqb;
>  
> +	REGB_WR32(VPU_37XX_BUTTRESS_GLOBAL_INT_MASK, 0x1);
> +
>  	ret_irqv = ivpu_hw_37xx_irqv_handler(vdev, irq);
>  	ret_irqb = ivpu_hw_37xx_irqb_handler(vdev, irq);
>  
> +	/* Re-enable global interrupts to re-trigger MSI for pending interrupts */
> +	REGB_WR32(VPU_37XX_BUTTRESS_GLOBAL_INT_MASK, 0x0);
> +
>  	return IRQ_RETVAL(ret_irqb | ret_irqv);
>  }
>  
> -- 
> 2.25.1
>