linux-kernel - [PATCH 06/13 resend] dw_dmac: Change value of DWC_MAX

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Message-ID: <201c75549049c9259327056d65b60525923f3d8a.1299146382.git.viresh.kumar@st.com>
Date:	Fri, 4 Mar 2011 15:42:50 +0530
From:	Viresh Kumar <viresh.kumar@...com>
To:	<vinod.koul@...el.com>, <dan.j.williams@...el.com>
Cc:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <viresh.linux@...il.com>,
	<shiraz.hashim@...com>, <armando.visconti@...com>,
	<amit.goel@...com>, <jamie@...ieiles.com>,
	<hans-christian.egtvedt@...el.com>,
	Viresh Kumar <viresh.kumar@...com>
Subject: [PATCH 06/13 resend] dw_dmac: Change value of DWC_MAX_COUNT to 4095.

Every descriptor can transfer a maximum count of 4095 (12 bits, in control reg),
So we must have DWC_MAX_COUNT as 4095 instead of 2048.

Signed-off-by: Viresh Kumar <viresh.kumar@...com>
---
 drivers/dma/dw_dmac.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index e5d97bf..711ebe9 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -47,14 +47,13 @@
 
 /*
  * This is configuration-dependent and usually a funny size like 4095.
- * Let's round it down to the nearest power of two.
  *
  * Note that this is a transfer count, i.e. if we transfer 32-bit
- * words, we can do 8192 bytes per descriptor.
+ * words, we can do 16380 bytes per descriptor.
  *
  * This parameter is also system-specific.
  */
-#define DWC_MAX_COUNT	2048U
+#define DWC_MAX_COUNT	4095U
 
 /*
  * Number of descriptors to allocate for each channel. This should be
-- 
1.7.2.2

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