From: Baolin Wang <baolin.wang@linaro.org>
To: dan.j.williams@intel.com, vkoul@kernel.org
Cc: eric.long@unisoc.com, orsonzhai@gmail.com, zhang.lyra@gmail.com,
vincent.guittot@linaro.org, baolin.wang@linaro.org,
dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 4/6] dmaengine: sprd: Fix block length overflow
Date: Mon, 6 May 2019 15:28:31 +0800 [thread overview]
Message-ID: <8f9a1748488e9d890995c158375482285253cc46.1557127239.git.baolin.wang@linaro.org> (raw)
In-Reply-To: <cover.1557127239.git.baolin.wang@linaro.org>
In-Reply-To: <cover.1557127239.git.baolin.wang@linaro.org>
From: Eric Long <eric.long@unisoc.com>
The maximum value of block length is 0xffff, so if the configured transfer length
is more than 0xffff, that will cause block length overflow to lead a configuration
error.
Thus we can set block length as the maximum burst length to avoid this issue, since
the maximum burst length will not be a big value which is more than 0xffff.
Signed-off-by: Eric Long <eric.long@unisoc.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/dma/sprd-dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 0f92e60..a01c232 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -778,7 +778,7 @@ static int sprd_dma_fill_desc(struct dma_chan *chan,
temp |= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK;
hw->frg_len = temp;
- hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK;
+ hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK;
hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
--
1.7.9.5
next prev parent reply other threads:[~2019-05-06 7:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-06 7:28 [PATCH v2 0/6] Fix some bugs and add new feature for Spreadtrum DMA engine Baolin Wang
2019-05-06 7:28 ` [PATCH v2 1/6] dmaengine: sprd: Fix the possible crash when getting descriptor status Baolin Wang
2019-05-06 7:28 ` [PATCH v2 2/6] dmaengine: sprd: Add validation of current descriptor in irq handler Baolin Wang
2019-05-06 7:28 ` [PATCH v2 3/6] dmaengine: sprd: Fix the incorrect start for 2-stage destination channels Baolin Wang
2019-05-06 7:28 ` Baolin Wang [this message]
2019-05-06 7:28 ` [PATCH v2 5/6] dmaengine: sprd: Fix the right place to configure 2-stage transfer Baolin Wang
2019-05-06 7:28 ` [PATCH v2 6/6] dmaengine: sprd: Add interrupt support for " Baolin Wang
2019-05-21 13:54 ` [PATCH v2 0/6] Fix some bugs and add new feature for Spreadtrum DMA engine Vinod Koul
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