On 01.10.2011 5:43, ming.lei@xxxxxxxxxxxxx wrote:
From: Ming Lei <ming.lei@xxxxxxxxxxxxx>
This quirk patch fixes one kind of bug inside some Intel Sandybridge
chipsets, see reports from
https://bugzilla.kernel.org/show_bug.cgi?id=40592.
Many guys also have reported the problem before:
https://bugs.launchpad.net/bugs/737388
https://bugs.launchpad.net/bugs/794642
https://bugs.launchpad.net/bugs/782389
......
With help from Tejun, the problem is found to be caused by 32bit PIO
mode, so introduce the quirk patch to disable 32bit PIO on SATA piix
for some Sandybridge CPT chipsets.
Seth also tested the patch on all five affected chipsets
(pci device ID: 0x1c00, 0x1c01, 0x1d00, 0x1e00, 0x1e01), and found
the patch does fix the problem.
Tested-by: Heasley, Seth<seth.heasley@xxxxxxxxx>
Cc: Alan Cox<alan@xxxxxxxxxxxxxxx>
Signed-off-by: Ming Lei<ming.lei@xxxxxxxxxxxxx>
Signed-off-by: Tejun Heo<htejun@xxxxxxxxx>
---
drivers/ata/ata_piix.c | 37 ++++++++++++++++++++++++++++++++-----
include/linux/libata.h | 1 +
2 files changed, 33 insertions(+), 5 deletions(-)
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 43107e9..70095be 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -113,6 +113,8 @@ enum {
PIIX_PATA_FLAGS = ATA_FLAG_SLAVE_POSS,
PIIX_SATA_FLAGS = ATA_FLAG_SATA | PIIX_FLAG_CHECKINTR,
+ PIIX_FLAG_PIO16 = ATA_FLAG_PIO16,
It's not clear why are you declaring a ganeric flag and then add a local
name for it...
diff --git a/include/linux/libata.h b/include/linux/libata.h
index efd6f98..dc68de5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -207,6 +207,7 @@ enum {
ATA_FLAG_SW_ACTIVITY = (1 << 22), /* driver supports sw activity
* led */
ATA_FLAG_NO_DIPM = (1 << 23), /* host not happy with DIPM */
+ ATA_FLAG_PIO16 = (1 << 24), /*16bit PIO */
Please, fix the formatting. Or better totally remove this.
WBR, Sergei
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