linux-kernel - [PATCH 3/4] dmaengine: qcom_bam_dma: use correct pipe FIFO size

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Date:	Tue,  1 Dec 2015 11:14:58 +0200
From:	Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	dmaengine@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Rob Herring <robh@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Andy Gross <agross@...eaurora.org>,
	Archit Taneja <architt@...eaurora.org>,
	Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH 3/4] dmaengine: qcom_bam_dma: use correct pipe FIFO size

The pipe fifo size register must instruct the bam hw
how many hw descriptors can be pushed to fifo. Currently
we isntruct the hw with 32KBytes but wrap the tail in
bam_start_dma in BAM_P_EVNT_REG on 4095 i.e. 32760. This
leads to stalled transactions when the tail wraps.

Fix this by use the correct fifo size in BAM_P_FIFO_SIZES
register i.e. 32K - 8.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 drivers/dma/qcom_bam_dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c
index 0f06f3b7a72b..6d290de9ab2b 100644
--- a/drivers/dma/qcom_bam_dma.c
+++ b/drivers/dma/qcom_bam_dma.c
@@ -458,7 +458,7 @@ static void bam_chan_init_hw(struct bam_chan *bchan,
 	 */
 	writel_relaxed(ALIGN(bchan->fifo_phys, sizeof(struct bam_desc_hw)),
 			bam_addr(bdev, bchan->id, BAM_P_DESC_FIFO_ADDR));
-	writel_relaxed(BAM_DESC_FIFO_SIZE,
+	writel_relaxed(BAM_MAX_DATA_SIZE,
 			bam_addr(bdev, bchan->id, BAM_P_FIFO_SIZES));
 
 	/* enable the per pipe interrupts, enable EOT, ERR, and INT irqs */
-- 
1.7.9.5

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