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Subject[PATCH 1/3] Blackfin NFC Driver: do not clobber DMAC1_PERIMUX
Date
From: Mike Frysinger <vapier.adi@gmail.com>

only set DMAC1_PERIMUX once we have requested and been granted the dma
channel to prevent breaking other peripherals in the error case

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
drivers/mtd/nand/bf5xx_nand.c | 14 ++++++--------
1 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index 9af2a2c..5c6056e 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -552,7 +552,6 @@ static void bf5xx_nand_dma_write_buf(struct mtd_info *mtd,
static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
{
int ret;
- unsigned short val;

/* Do not use dma */
if (!hardware_ecc)
@@ -560,13 +559,6 @@ static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)

init_completion(&info->dma_completion);

-#ifdef CONFIG_BF54x
- /* Setup DMAC1 channel mux for NFC which shared with SDH */
- val = bfin_read_DMAC1_PERIMUX();
- val &= 0xFFFE;
- bfin_write_DMAC1_PERIMUX(val);
- SSYNC();
-#endif
/* Request NFC DMA channel */
ret = request_dma(CH_NFC, "BF5XX NFC driver");
if (ret < 0) {
@@ -574,6 +566,12 @@ static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
return ret;
}

+#ifdef CONFIG_BF54x
+ /* Setup DMAC1 channel mux for NFC which shared with SDH */
+ bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() & ~1);
+ SSYNC();
+#endif
+
set_dma_callback(CH_NFC, (void *) bf5xx_nand_dma_irq, (void *) info);

/* Turn off the DMA channel first */
--
1.5.6


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