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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>,
	Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
	Abhinav Kumar <abhinavk@codeaurora.org>
Cc: Jonathan Marek <jonathan@marek.ca>,
	Stephen Boyd <sboyd@kernel.org>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org
Subject: [PATCH v2 1/6] drm/msm/dpu: merge dpu_hw_intr_get_interrupt_statuses into dpu_hw_intr_dispatch_irqs
Date: Sun, 16 May 2021 23:29:06 +0300	[thread overview]
Message-ID: <20210516202910.2141079-2-dmitry.baryshkov@linaro.org> (raw)
In-Reply-To: <20210516202910.2141079-1-dmitry.baryshkov@linaro.org>

There is little sense in reading interrupt statuses and right after that
going after the array of statuses to dispatch them. Merge both loops
into single function doing read and dispatch.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c  | 10 +--
 .../gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 66 ++++++-------------
 .../gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h |  8 ---
 3 files changed, 20 insertions(+), 64 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 cdec3fbe6ff4..54b34746a587 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
@@ -376,15 +376,6 @@ void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms)
 
 irqreturn_t dpu_core_irq(struct dpu_kms *dpu_kms)
 {
-	/*
-	 * Read interrupt status from all sources. Interrupt status are
-	 * stored within hw_intr.
-	 * Function will also clear the interrupt status after reading.
-	 * Individual interrupt status bit will only get stored if it
-	 * is enabled.
-	 */
-	dpu_kms->hw_intr->ops.get_interrupt_statuses(dpu_kms->hw_intr);
-
 	/*
 	 * Dispatch to HW driver to handle interrupt lookup that is being
 	 * fired. When matching interrupt is located, HW driver will call to
@@ -392,6 +383,7 @@ irqreturn_t dpu_core_irq(struct dpu_kms *dpu_kms)
 	 * dpu_core_irq_callback_handler will perform the registered function
 	 * callback, and do the interrupt status clearing once the registered
 	 * callback is finished.
+	 * Function will also clear the interrupt status after reading.
 	 */
 	dpu_kms->hw_intr->ops.dispatch_irqs(
 			dpu_kms->hw_intr,
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 48c96b812126..cf9bfd45aa59 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
@@ -1371,6 +1371,7 @@ static void dpu_hw_intr_dispatch_irq(struct dpu_hw_intr *intr,
 	int start_idx;
 	int end_idx;
 	u32 irq_status;
+	u32 enable_mask;
 	unsigned long irq_flags;
 
 	if (!intr)
@@ -1383,8 +1384,6 @@ static void dpu_hw_intr_dispatch_irq(struct dpu_hw_intr *intr,
 	 */
 	spin_lock_irqsave(&intr->irq_lock, irq_flags);
 	for (reg_idx = 0; reg_idx < ARRAY_SIZE(dpu_intr_set); reg_idx++) {
-		irq_status = intr->save_irq_status[reg_idx];
-
 		/*
 		 * Each Interrupt register has a range of 64 indexes, and
 		 * that is static for dpu_irq_map.
@@ -1396,6 +1395,20 @@ static void dpu_hw_intr_dispatch_irq(struct dpu_hw_intr *intr,
 			start_idx >= ARRAY_SIZE(dpu_irq_map))
 			continue;
 
+		/* Read interrupt status */
+		irq_status = DPU_REG_READ(&intr->hw, dpu_intr_set[reg_idx].status_off);
+
+		/* Read enable mask */
+		enable_mask = DPU_REG_READ(&intr->hw, dpu_intr_set[reg_idx].en_off);
+
+		/* and clear the interrupt */
+		if (irq_status)
+			DPU_REG_WRITE(&intr->hw, dpu_intr_set[reg_idx].clr_off,
+				     irq_status);
+
+		/* Finally update IRQ status based on enable mask */
+		irq_status &= enable_mask;
+
 		/*
 		 * Search through matching intr status from irq map.
 		 * start_idx and end_idx defined the search range in
@@ -1429,6 +1442,10 @@ static void dpu_hw_intr_dispatch_irq(struct dpu_hw_intr *intr,
 				irq_status &= ~dpu_irq_map[irq_idx].irq_mask;
 			}
 	}
+
+	/* ensure register writes go through */
+	wmb();
+
 	spin_unlock_irqrestore(&intr->irq_lock, irq_flags);
 }
 
@@ -1580,41 +1597,6 @@ static int dpu_hw_intr_disable_irqs(struct dpu_hw_intr *intr)
 	return 0;
 }
 
-static void dpu_hw_intr_get_interrupt_statuses(struct dpu_hw_intr *intr)
-{
-	int i;
-	u32 enable_mask;
-	unsigned long irq_flags;
-
-	if (!intr)
-		return;
-
-	spin_lock_irqsave(&intr->irq_lock, irq_flags);
-	for (i = 0; i < ARRAY_SIZE(dpu_intr_set); i++) {
-		if (!test_bit(i, &intr->irq_mask))
-			continue;
-
-		/* Read interrupt status */
-		intr->save_irq_status[i] = DPU_REG_READ(&intr->hw,
-				dpu_intr_set[i].status_off);
-
-		/* Read enable mask */
-		enable_mask = DPU_REG_READ(&intr->hw, dpu_intr_set[i].en_off);
-
-		/* and clear the interrupt */
-		if (intr->save_irq_status[i])
-			DPU_REG_WRITE(&intr->hw, dpu_intr_set[i].clr_off,
-					intr->save_irq_status[i]);
-
-		/* Finally update IRQ status based on enable mask */
-		intr->save_irq_status[i] &= enable_mask;
-	}
-
-	/* ensure register writes go through */
-	wmb();
-
-	spin_unlock_irqrestore(&intr->irq_lock, irq_flags);
-}
 
 static void dpu_hw_intr_clear_intr_status_nolock(struct dpu_hw_intr *intr,
 		int irq_idx)
@@ -1673,7 +1655,6 @@ 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->get_interrupt_statuses = dpu_hw_intr_get_interrupt_statuses;
 	ops->clear_intr_status_nolock = dpu_hw_intr_clear_intr_status_nolock;
 	ops->get_interrupt_status = dpu_hw_intr_get_interrupt_status;
 }
@@ -1710,14 +1691,6 @@ struct dpu_hw_intr *dpu_hw_intr_init(void __iomem *addr,
 		return ERR_PTR(-ENOMEM);
 	}
 
-	intr->save_irq_status = kcalloc(ARRAY_SIZE(dpu_intr_set), sizeof(u32),
-			GFP_KERNEL);
-	if (intr->save_irq_status == NULL) {
-		kfree(intr->cache_irq_mask);
-		kfree(intr);
-		return ERR_PTR(-ENOMEM);
-	}
-
 	intr->irq_mask = m->mdss_irqs;
 	intr->obsolete_irq = m->obsolete_irq;
 
@@ -1730,7 +1703,6 @@ void dpu_hw_intr_destroy(struct dpu_hw_intr *intr)
 {
 	if (intr) {
 		kfree(intr->cache_irq_mask);
-		kfree(intr->save_irq_status);
 		kfree(intr);
 	}
 }
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 5d6f9a7a5195..5a1c304ba93f 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
@@ -142,14 +142,6 @@ struct dpu_hw_intr_ops {
 			void (*cbfunc)(void *arg, int irq_idx),
 			void *arg);
 
-	/**
-	 * get_interrupt_statuses - Gets and store value from all interrupt
-	 *                          status registers that are currently fired.
-	 * @intr:	HW interrupt handle
-	 */
-	void (*get_interrupt_statuses)(
-			struct dpu_hw_intr *intr);
-
 	/**
 	 * clear_intr_status_nolock() - clears the HW interrupts without lock
 	 * @intr:	HW interrupt handle
-- 
2.30.2


  reply	other threads:[~2021-05-16 20:29 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-16 20:29 [PATCH v2 0/6] drm/msm/dpu: rework irq handling Dmitry Baryshkov
2021-05-16 20:29 ` Dmitry Baryshkov [this message]
2021-05-24 21:44   ` [Freedreno] [PATCH v2 1/6] drm/msm/dpu: merge dpu_hw_intr_get_interrupt_statuses into dpu_hw_intr_dispatch_irqs abhinavk
2021-05-16 20:29 ` [PATCH v2 2/6] drm/msm/dpu: hw_intr: always call dpu_hw_intr_clear_intr_status_nolock Dmitry Baryshkov
2021-05-24 21:46   ` [Freedreno] " abhinavk
2021-05-16 20:29 ` [PATCH v2 3/6] drm/msm/dpu: define interrupt register names Dmitry Baryshkov
2021-05-24 21:51   ` [Freedreno] " abhinavk
2021-05-16 20:29 ` [PATCH v2 4/6] drm/msm/dpu: replace IRQ lookup with the data in hw catalog Dmitry Baryshkov
2021-05-24 21:57   ` [Freedreno] " abhinavk
2021-05-26  2:09     ` Dmitry Baryshkov
2021-05-16 20:29 ` [PATCH v2 5/6] drm/msm/dpu: drop remains of old irq lookup subsystem Dmitry Baryshkov
2021-05-24 21:58   ` [Freedreno] " abhinavk
2021-05-16 20:29 ` [PATCH v2 6/6] drm/msm/dpu: simplify IRQ enabling/disabling Dmitry Baryshkov
2021-05-24 22:13   ` [Freedreno] " abhinavk

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