From: Mans Rullgard <mans@mansr.com>
To: Viresh Kumar <vireshk@kernel.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Vinod Koul <vinod.koul@intel.com>,
linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org
Cc: Dan Williams <dan.j.williams@intel.com>
Subject: [PATCH 02/15] dmaengine: dw: clear LLP_[SD]_EN bits in last descriptor of a chain
Date: Sun, 24 Jan 2016 19:21:49 +0000 [thread overview]
Message-ID: <1453663322-14474-3-git-send-email-mans@mansr.com> (raw)
In-Reply-To: <1453663322-14474-1-git-send-email-mans@mansr.com>
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 cc7c1acc8188..03ec88f1c161 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -764,6 +764,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
lli_set(prev, ctllo, DWC_CTLL_INT_EN);
prev->lli.llp = 0;
+ lli_clear(prev, ctllo, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->txd.flags = flags;
first->total_len = len;
@@ -923,6 +924,7 @@ slave_sg_fromdev_fill_desc:
lli_set(prev, ctllo, DWC_CTLL_INT_EN);
prev->lli.llp = 0;
+ lli_clear(prev, ctllo, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->total_len = total_len;
return &first->txd;
--
2.7.0
next prev parent reply other threads:[~2016-01-24 19:24 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-24 19:21 [PATCH 00/15] dmaengine: dw: various fixes and cleanups Mans Rullgard
2016-01-24 19:21 ` [PATCH 01/15] dmaengine: dw: fix byte order of hw descriptor fields Mans Rullgard
2016-01-24 19:21 ` Mans Rullgard [this message]
2016-01-24 19:21 ` [PATCH 03/15] dmaengine: dw: rename masters to reflect actual topology Mans Rullgard
2016-01-24 20:09 ` Hans-Christian Noren Egtvedt
2016-01-24 20:19 ` Måns Rullgård
2016-01-24 20:37 ` Hans-Christian Noren Egtvedt
2016-01-24 20:57 ` Måns Rullgård
2016-01-24 22:36 ` Mark Brown
2016-01-24 22:38 ` Måns Rullgård
2016-01-25 6:03 ` Viresh Kumar
2016-01-25 12:05 ` Vinod Koul
2016-01-25 12:23 ` Mark Brown
2016-01-25 8:35 ` Andy Shevchenko
2016-01-25 12:24 ` Mark Brown
2016-01-25 14:01 ` Andy Shevchenko
2016-01-27 12:47 ` Mark Brown
2016-01-24 19:21 ` [PATCH 04/15] dmaengine: dw: set src and dst master select according to xfer direction Mans Rullgard
2016-01-24 19:21 ` [PATCH 05/15] dmaengine: dw: set LMS field in descriptors Mans Rullgard
2016-01-24 19:21 ` [PATCH 06/15] dmaengine: dw: substitute dma_read_byaddr by dma_readl_native Mans Rullgard
2016-01-24 19:21 ` [PATCH 07/15] dmaengine: dw: revisit data_width property Mans Rullgard
2016-01-25 7:32 ` Vineet Gupta
2016-01-25 8:45 ` Andy Shevchenko
2016-01-25 10:31 ` Måns Rullgård
2016-01-25 10:36 ` Andy Shevchenko
2016-01-25 8:42 ` Andy Shevchenko
2016-01-26 21:07 ` Rob Herring
2016-01-27 12:26 ` Andy Shevchenko
2016-01-24 19:21 ` [PATCH 08/15] dmaengine: dw: define counter variables as unsigned int Mans Rullgard
2016-01-24 19:21 ` [PATCH 09/15] dmaengine: dw: keep entire platform data in struct dw_dma Mans Rullgard
2016-01-24 19:21 ` [PATCH 10/15] dmaengine: dw: pass platform data via struct dw_dma_chip Mans Rullgard
2016-01-24 19:21 ` [PATCH 11/15] dmaengine: dw: platform: use field-by-field initialization Mans Rullgard
2016-01-25 8:48 ` Andy Shevchenko
2016-01-24 19:21 ` [PATCH 12/15] dmaengine: dw: move dwc->paused to dwc->flags Mans Rullgard
2016-01-24 19:22 ` [PATCH 13/15] dmaengine: dw: move dwc->initialized " Mans Rullgard
2016-01-24 19:22 ` [PATCH 14/15] dmaengine: dw: move residue to a descriptor Mans Rullgard
2016-01-24 19:22 ` [PATCH 15/15] dmaengine: dw: set cdesc to NULL when free cyclic transfers Mans Rullgard
2016-01-25 10:37 ` [PATCH 00/15] dmaengine: dw: various fixes and cleanups Andy Shevchenko
2016-01-25 12:07 ` Vinod Koul
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