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authorTejun Heo <tj@kernel.org>2010-06-01 17:29:21 +0200
committerJeff Garzik <jgarzik@redhat.com>2010-06-02 13:49:57 -0400
commitf3faf8fc3fab45c3526efe8c9e99bb23f8723350 (patch)
treea327ab54b653f8556349931fd0c48de8d060d613 /drivers/ata
parent8b27ff4cf6d15964aa2987aeb58db4dfb1f87a19 (diff)
downloadlinux-2.6.34-ux500-f3faf8fc3fab45c3526efe8c9e99bb23f8723350.tar.gz
sata_nv: don't diddle with nIEN on mcp55
On mcp55, nIEN gets stuck once set and liteon blueray rom iHOS104-08 violates ATA specification and fails to set I on D2H Reg FIS if nIEN is set when the command was issued. When the other party is following the spec, both devices can work fine but when the two flaws are put together, they can't talk to each other. mcp55 has its own IRQ masking mechanism and there's no reason to mess with nIEN in the first place. Fix it by dropping nIEN diddling from nv_mcp55_freeze/thaw(). This was originally reported by Cengiz. Although Cengiz hasn't verified the fix yet, I could reproduce this problem and verfiy the fix. Even if Cengiz is experiencing different or additional problems, this patch is needed. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Cengiz G√ľnay <cgunay@emory.edu> Cc: stable@kernel.org Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/sata_nv.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 6fd11478411..21161136cad 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -1669,7 +1669,6 @@ static void nv_mcp55_freeze(struct ata_port *ap)
mask = readl(mmio_base + NV_INT_ENABLE_MCP55);
mask &= ~(NV_INT_ALL_MCP55 << shift);
writel(mask, mmio_base + NV_INT_ENABLE_MCP55);
- ata_sff_freeze(ap);
}
static void nv_mcp55_thaw(struct ata_port *ap)
@@ -1683,7 +1682,6 @@ static void nv_mcp55_thaw(struct ata_port *ap)
mask = readl(mmio_base + NV_INT_ENABLE_MCP55);
mask |= (NV_INT_MASK_MCP55 << shift);
writel(mask, mmio_base + NV_INT_ENABLE_MCP55);
- ata_sff_thaw(ap);
}
static void nv_adma_error_handler(struct ata_port *ap)