From: Mans Rullgard <mans@mansr.com>
To: Viresh Kumar <vireshk@kernel.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vinod.koul@intel.com>,
dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] dmaengine: dw: clear LLP_[SD]_EN bits in last descriptor of a chain
Date: Mon, 21 Dec 2015 19:10:37 +0000 [thread overview]
Message-ID: <1450725037-26492-1-git-send-email-mans@mansr.com> (raw)
The datasheet requires that the LLP_[SD]_EN bits be cleared whenever
LLP.LOC is zero, i.e. in the last descriptor of a multi-block chain.
Make the driver do this.
Signed-off-by: Mans Rullgard <mans@mansr.com>
---
drivers/dma/dw/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 7067b6ddc1db..ca7cafc82f6b 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -751,6 +751,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
prev->lli.ctllo |= DWC_CTLL_INT_EN;
prev->lli.llp = 0;
+ prev->lli.ctllo &= ~(DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->txd.flags = flags;
first->total_len = len;
@@ -912,6 +913,7 @@ slave_sg_fromdev_fill_desc:
prev->lli.ctllo |= DWC_CTLL_INT_EN;
prev->lli.llp = 0;
+ prev->lli.ctllo &= ~(DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->total_len = total_len;
return &first->txd;
--
2.6.3
next reply other threads:[~2015-12-21 19:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-21 19:10 Mans Rullgard [this message]
2015-12-21 19:34 ` Andy Shevchenko
2015-12-22 16:54 ` Shevchenko, Andriy
2016-01-06 9:20 ` Vinod Koul
2015-12-22 5:38 ` Viresh Kumar
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