linux-kernel - [PATCH 3/7 v5] k3dma: Fix "nobody cared" message seen on any error

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Message-Id: <1472491853-15644-4-git-send-email-john.stultz@linaro.org>
Date:   Mon, 29 Aug 2016 10:30:49 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     Andy Green <andy.green@...aro.org>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Krzysztof Kozlowski <k.kozlowski@...sung.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Mark Brown <broonie@...nel.org>, Andy Green <andy@...mcat.com>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH 3/7 v5] k3dma: Fix "nobody cared" message seen on any error

From: Andy Green <andy.green@...aro.org>

As it was before, as soon as the DMAC IP felt there was an error
he would return IRQ_NONE since no actual transfer had completed.

After spinning on that for 100K interrupts, Linux yanks the IRQ with
a "nobody cared" error.

This patch lets it handle the interrupt and keep the IRQ alive.

Cc: Zhangfei Gao <zhangfei.gao@...aro.org>
Cc: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Andy Green <andy@...mcat.com>
Acked-by: Zhangfei Gao <zhangfei.gao@...aro.org>
Signed-off-by: Andy Green <andy.green@...aro.org>
[jstultz: Forward ported to mainline]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/dma/k3dma.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index 7dc7816..f46b9b8 100644
--- a/drivers/dma/k3dma.c
+++ b/drivers/dma/k3dma.c
@@ -221,11 +221,13 @@ static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)
 	writel_relaxed(err1, d->base + INT_ERR1_RAW);
 	writel_relaxed(err2, d->base + INT_ERR2_RAW);
 
-	if (irq_chan) {
+	if (irq_chan)
 		tasklet_schedule(&d->task);
+
+	if (irq_chan || err1 || err2)
 		return IRQ_HANDLED;
-	} else
-		return IRQ_NONE;
+
+	return IRQ_NONE;
 }
 
 static int k3_dma_start_txd(struct k3_dma_chan *c)
-- 
1.9.1