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authorSergei Shtylyov <sshtylyov@ru.mvista.com>2006-05-16 20:16:41 +0400
committerDavid Woodhouse <dwmw2@infradead.org>2006-05-16 17:25:19 +0100
commit155285c4775b7027b01a5b744c721ae43cced798 (patch)
tree4bbfba4b281c3368c2544eafa1e93b63b517c509 /drivers/mtd/nand/au1550nd.c
parentc41ff6e5f38b02ff927d0d510e28dc1392bb4690 (diff)
NAND: AMD Au1550 driver reads write-only register
During the last cleanup of the AMD Au1550 NAND driver the old buglet was reintroduced: as the MEM_STNDCTL register is write-only and seem to always read as 0x31, read-modify-write to it done in au1xxx_nand_init() will have the side effect of enabling -RCS0/1 pin override (via bits 4/5 of this reg.), thus possibly causing a contention on the static bus when the NOR flash (using -RCS0) or board control status registers (using -RCS2) are read. Luckily, this goes away with a first NAND access, since au1550_hwcontrol() doesn't try to read this register before writing anymore. Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd/nand/au1550nd.c')
-rw-r--r--drivers/mtd/nand/au1550nd.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
index 861fb961d942..839b35a386b6 100644
--- a/drivers/mtd/nand/au1550nd.c
+++ b/drivers/mtd/nand/au1550nd.c
@@ -347,11 +347,9 @@ static int __init au1xxx_nand_init(void)
au1550_mtd->priv = this;
au1550_mtd->owner = THIS_MODULE;
- /* disable interrupts */
- au_writel(au_readl(MEM_STNDCTL) & ~(1 << 8), MEM_STNDCTL);
- /* disable NAND boot */
- au_writel(au_readl(MEM_STNDCTL) & ~(1 << 0), MEM_STNDCTL);
+ /* MEM_STNDCTL: disable ints, disable nand boot */
+ au_writel(0, MEM_STNDCTL);
#ifdef CONFIG_MIPS_PB1550
/* set gpio206 high */