On Sun 11 Apr 19:09 CDT 2021, Dmitry Baryshkov wrote:
> Always call dpu_hw_intr_clear_intr_status_nolock() from the
> dpu_hw_intr_dispatch_irqs(). This simplifies the callback function
> (which call clears the interrupts anyway) and enforces clearing the hw
> interrupt status.
>
Reviewed-by: Bjorn Andersson <bjorn.anders...@linaro.org>
Regards,
Bjorn
> Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c | 9 -----
> .../gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 39 +++++++++----------
> .../gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h | 9 -----
> 3 files changed, 18 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
> index 54b34746a587..fd11a2aeab6c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
> @@ -41,15 +41,6 @@ static void dpu_core_irq_callback_handler(void *arg, int
> irq_idx)
> if (cb->func)
> cb->func(cb->arg, irq_idx);
> spin_unlock_irqrestore(&dpu_kms->irq_obj.cb_lock, irq_flags);
> -
> - /*
> - * Clear pending interrupt status in HW.
> - * NOTE: dpu_core_irq_callback_handler is protected by top-level
> - * spinlock, so it is safe to clear any interrupt status here.
> - */
> - dpu_kms->hw_intr->ops.clear_intr_status_nolock(
> - dpu_kms->hw_intr,
> - irq_idx);
> }
>
> int dpu_core_irq_idx_lookup(struct dpu_kms *dpu_kms,
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> index cf9bfd45aa59..8bd22e060437 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> @@ -1362,6 +1362,22 @@ static int dpu_hw_intr_irqidx_lookup(struct
> dpu_hw_intr *intr,
> return -EINVAL;
> }
>
> +static void dpu_hw_intr_clear_intr_status_nolock(struct dpu_hw_intr *intr,
> + int irq_idx)
> +{
> + int reg_idx;
> +
> + if (!intr)
> + return;
> +
> + reg_idx = dpu_irq_map[irq_idx].reg_idx;
> + DPU_REG_WRITE(&intr->hw, dpu_intr_set[reg_idx].clr_off,
> + dpu_irq_map[irq_idx].irq_mask);
> +
> + /* ensure register writes go through */
> + wmb();
> +}
> +
> static void dpu_hw_intr_dispatch_irq(struct dpu_hw_intr *intr,
> void (*cbfunc)(void *, int),
> void *arg)
> @@ -1430,9 +1446,8 @@ static void dpu_hw_intr_dispatch_irq(struct dpu_hw_intr
> *intr,
> */
> if (cbfunc)
> cbfunc(arg, irq_idx);
> - else
> - intr->ops.clear_intr_status_nolock(
> - intr, irq_idx);
> +
> + dpu_hw_intr_clear_intr_status_nolock(intr,
> irq_idx);
>
> /*
> * When callback finish, clear the irq_status
> @@ -1597,23 +1612,6 @@ static int dpu_hw_intr_disable_irqs(struct dpu_hw_intr
> *intr)
> return 0;
> }
>
> -
> -static void dpu_hw_intr_clear_intr_status_nolock(struct dpu_hw_intr *intr,
> - int irq_idx)
> -{
> - int reg_idx;
> -
> - if (!intr)
> - return;
> -
> - reg_idx = dpu_irq_map[irq_idx].reg_idx;
> - DPU_REG_WRITE(&intr->hw, dpu_intr_set[reg_idx].clr_off,
> - dpu_irq_map[irq_idx].irq_mask);
> -
> - /* ensure register writes go through */
> - wmb();
> -}
> -
> static u32 dpu_hw_intr_get_interrupt_status(struct dpu_hw_intr *intr,
> int irq_idx, bool clear)
> {
> @@ -1655,7 +1653,6 @@ static void __setup_intr_ops(struct dpu_hw_intr_ops
> *ops)
> ops->dispatch_irqs = dpu_hw_intr_dispatch_irq;
> ops->clear_all_irqs = dpu_hw_intr_clear_irqs;
> ops->disable_all_irqs = dpu_hw_intr_disable_irqs;
> - ops->clear_intr_status_nolock = dpu_hw_intr_clear_intr_status_nolock;
> ops->get_interrupt_status = dpu_hw_intr_get_interrupt_status;
> }
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> index 5a1c304ba93f..5bade5637ecc 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> @@ -142,15 +142,6 @@ struct dpu_hw_intr_ops {
> void (*cbfunc)(void *arg, int irq_idx),
> void *arg);
>
> - /**
> - * clear_intr_status_nolock() - clears the HW interrupts without lock
> - * @intr: HW interrupt handle
> - * @irq_idx: Lookup irq index return from irq_idx_lookup
> - */
> - void (*clear_intr_status_nolock)(
> - struct dpu_hw_intr *intr,
> - int irq_idx);
> -
> /**
> * get_interrupt_status - Gets HW interrupt status, and clear if set,
> * based on given lookup IRQ index.
> --
> 2.30.2
>
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