linux-kernel - [PATCH 23/62] Blackfin: annotate anomaly 05000119 in core DMA code

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Date:	Fri,  5 Jun 2009 04:04:32 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	linux-kernel@...r.kernel.org
Cc:	uclinux-dist-devel@...ckfin.uclinux.org,
	Robin Getz <robin.getz@...log.com>
Subject: [PATCH 23/62] Blackfin: annotate anomaly 05000119 in core DMA code

From: Robin Getz <robin.getz@...log.com>

Add a reminder note to avoid the DMA_DONE bit in our DMA core code.

Signed-off-by: Robin Getz <robin.getz@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 arch/blackfin/kernel/bfin_dma_5xx.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index 704419e..763ed84 100644
--- a/arch/blackfin/kernel/bfin_dma_5xx.c
+++ b/arch/blackfin/kernel/bfin_dma_5xx.c
@@ -20,6 +20,11 @@
 #include <asm/dma.h>
 #include <asm/uaccess.h>
 
+/*
+ * To make sure we work around 05000119 - we always check DMA_DONE bit,
+ * never the DMA_RUN bit
+ */
+
 struct dma_channel dma_ch[MAX_DMA_CHANNELS];
 EXPORT_SYMBOL(dma_ch);
 
-- 
1.6.3.1

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