Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=43a98f05d99205687ddf74089e79a8312c8c5f90
Commit: 43a98f05d99205687ddf74089e79a8312c8c5f90
Parent: 16c55b038033d8f6f7601996dfae44399666d9ab
Author: Tejun Heo <[EMAIL PROTECTED]>
AuthorDate: Thu Aug 23 10:15:18 2007 +0900
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Fri Aug 31 04:27:47 2007 -0400
ata_piix: implement IOCFG bit18 quirk
Some notebooks need bit18 of IOCFG to be cleared for the drive bay to
work even though the bit is NOOP according to the datasheet. This
patch implement IOCFG bit18 quirk and apply it to Clevo M570U.
http://bugzilla.kernel.org/show_bug.cgi?id=8051
Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
Cc: D. Angelis <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/ata/ata_piix.c | 36 ++++++++++++++++++++++++++++++++++++
1 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 22752e4..0ff96a0 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1173,6 +1173,39 @@ static void __devinit piix_init_sata_map(struct pci_dev
*pdev,
hpriv->map = map;
}
+static void piix_iocfg_bit18_quirk(struct pci_dev *pdev)
+{
+ static struct dmi_system_id sysids[] = {
+ {
+ /* Clevo M570U sets IOCFG bit 18 if the cdrom
+ * isn't used to boot the system which
+ * disables the channel.
+ */
+ .ident = "M570U",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Clevo Co."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "M570U"),
+ },
+ },
+ };
+ u32 iocfg;
+
+ if (!dmi_check_system(sysids))
+ return;
+
+ /* The datasheet says that bit 18 is NOOP but certain systems
+ * seem to use it to disable a channel. Clear the bit on the
+ * affected systems.
+ */
+ pci_read_config_dword(pdev, PIIX_IOCFG, &iocfg);
+ if (iocfg & (1 << 18)) {
+ dev_printk(KERN_INFO, &pdev->dev,
+ "applying IOCFG bit18 quirk\n");
+ iocfg &= ~(1 << 18);
+ pci_write_config_dword(pdev, PIIX_IOCFG, iocfg);
+ }
+}
+
/**
* piix_init_one - Register PIIX ATA PCI device with kernel services
* @pdev: PCI device to register
@@ -1234,6 +1267,9 @@ static int piix_init_one (struct pci_dev *pdev, const
struct pci_device_id *ent)
piix_map_db_table[ent->driver_data]);
}
+ /* apply IOCFG bit18 quirk */
+ piix_iocfg_bit18_quirk(pdev);
+
/* On ICH5, some BIOSen disable the interrupt using the
* PCI_COMMAND_INTX_DISABLE bit added in PCI 2.3.
* On ICH6, this bit has the same effect, but only when
-
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