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authorTejun Heo <htejun@gmail.com>2007-02-02 10:50:52 +0300
committerJeff Garzik <jeff@garzik.org>2007-05-01 15:49:53 +0400
commitd4b2bab4f26345ea1803feb23ea92fbe3f6b77bc (patch)
tree30a9826351e597828de2b402f1c41b9fca94cf95 /drivers/ata/pata_sil680.c
parentdc87c3985e9b442c60994308a96f887579addc39 (diff)
downloadlinux-d4b2bab4f26345ea1803feb23ea92fbe3f6b77bc.tar.xz
libata: add deadline support to prereset and reset methods
Add @deadline to prereset and reset methods and make them honor it. ata_wait_ready() which directly takes @deadline is implemented to be used as the wait function. This patch is in preparation for EH timing improvements. * ata_wait_ready() never does busy sleep. It's only used from EH and no wait in EH is that urgent. This function also prints 'be patient' message automatically after 5 secs of waiting if more than 3 secs is remaining till deadline. * ata_bus_post_reset() now fails with error code if any of its wait fails. This is important because earlier reset tries will have shorter timeout than the spec requires. If a device fails to respond before the short timeout, reset should be retried with longer timeout rather than silently ignoring the device. There are three behavior differences. 1. Timeout is applied to both devices at once, not separately. This is more consistent with what the spec says. 2. When a device passes devchk but fails to become ready before deadline. Previouly, post_reset would just succeed and let device classification remove the device. New code fails the reset thus causing reset retry. After a few times, EH will give up disabling the port. 3. When slave device passes devchk but fails to become accessible (TF-wise) after reset. Original code disables dev1 after 30s timeout and continues as if the device doesn't exist, while the patched code fails reset. When this happens, new code fails reset on whole port rather than proceeding with only the primary device. If the failing device is suffering transient problems, new code retries reset which is a better behavior. If the failing device is actually broken, the net effect is identical to it, but not to the other device sharing the channel. In the previous code, reset would have succeeded after 30s thus detecting the working one. In the new code, reset fails and whole port gets disabled. IMO, it's a pathological case anyway (broken device sharing bus with working one) and doesn't really matter. * ata_bus_softreset() is changed to return error code from ata_bus_post_reset(). It used to return 0 unconditionally. * Spin up waiting is to be removed and not converted to honor deadline. * To be on the safe side, deadline is set to 40s for the time being. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/pata_sil680.c')
-rw-r--r--drivers/ata/pata_sil680.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index 6770820cfca9..a5886f061c0b 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -94,11 +94,13 @@ static int sil680_cable_detect(struct ata_port *ap) {
/**
* sil680_bus_reset - reset the SIL680 bus
* @ap: ATA port to reset
+ * @deadline: deadline jiffies for the operation
*
* Perform the SIL680 housekeeping when doing an ATA bus reset
*/
-static int sil680_bus_reset(struct ata_port *ap,unsigned int *classes)
+static int sil680_bus_reset(struct ata_port *ap,unsigned int *classes,
+ unsigned long deadline)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
unsigned long addr = sil680_selreg(ap, 0);
@@ -108,7 +110,7 @@ static int sil680_bus_reset(struct ata_port *ap,unsigned int *classes)
pci_write_config_byte(pdev, addr, reset | 0x03);
udelay(25);
pci_write_config_byte(pdev, addr, reset);
- return ata_std_softreset(ap, classes);
+ return ata_std_softreset(ap, classes, deadline);
}
static void sil680_error_handler(struct ata_port *ap)