The patch titled
scx200_acb: fix for CS5535 errata
has been removed from the -mm tree. Its filename is
scx200_acb-fix-for-cs5535-eratta.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
From: "Jordan Crouse" <jordan.crouse@xxxxxxx>
This is a fix for the CS5535 errata 111:
When the SMB controller tries to access a non-existing device, it sets the
NEGACK bit, SMB I/O Offset 01h[4], to 1 after it detects no acknowledge at
the ninth clock. The specification says there are only two ways to clear
this status bit: write 1 to this bit or disable the SMB controller.
Sometimes this bit is cleared by a read of this register, but not always.
Signed-off-by: Jordan Crouse <jordan.crouse@xxxxxxx>
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: eGreg KH <greg@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/i2c/busses/scx200_acb.c | 7 +++++++
1 files changed, 7 insertions(+)
diff -puN drivers/i2c/busses/scx200_acb.c~scx200_acb-fix-for-cs5535-eratta drivers/i2c/busses/scx200_acb.c
--- devel/drivers/i2c/busses/scx200_acb.c~scx200_acb-fix-for-cs5535-eratta 2006-04-01 16:32:47.000000000 -0800
+++ devel-akpm/drivers/i2c/busses/scx200_acb.c 2006-04-01 16:32:47.000000000 -0800
@@ -133,6 +133,9 @@ static void scx200_acb_machine(struct sc
outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
outb(ACBST_STASTR | ACBST_NEGACK, ACBST);
+
+ /* Reset the status register */
+ outb(0, ACBST);
return;
}
@@ -228,6 +231,10 @@ static void scx200_acb_poll(struct scx20
timeout = jiffies + POLL_TIMEOUT;
while (time_before(jiffies, timeout)) {
status = inb(ACBST);
+
+ /* Reset the status register to avoid the hang */
+ outb(0, ACBST);
+
if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) {
scx200_acb_machine(iface, status);
return;
_
Patches currently in -mm which might be from jordan.crouse@xxxxxxx are
scx200_acb-use-pci-i-o-resource-when-appropriate.patch
-
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