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authorTejun Heo <htejun@gmail.com>2007-02-02 16:50:52 +0900
committerJeff Garzik <jeff@garzik.org>2007-05-01 07:49:53 -0400
commitd4b2bab4f26345ea1803feb23ea92fbe3f6b77bc (patch)
tree30a9826351e597828de2b402f1c41b9fca94cf95 /drivers/ata/pata_sis.c
parentdc87c3985e9b442c60994308a96f887579addc39 (diff)
downloadblackbird-op-linux-d4b2bab4f26345ea1803feb23ea92fbe3f6b77bc.tar.gz
blackbird-op-linux-d4b2bab4f26345ea1803feb23ea92fbe3f6b77bc.zip
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_sis.c')
-rw-r--r--drivers/ata/pata_sis.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index a3fbcee6fb33..7c6b58223c79 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -88,6 +88,7 @@ static int sis_port_base(struct ata_device *adev)
/**
* sis_133_cable_detect - check for 40/80 pin
* @ap: Port
+ * @deadline: deadline jiffies for the operation
*
* Perform cable detection for the later UDMA133 capable
* SiS chipset.
@@ -108,6 +109,7 @@ static int sis_133_cable_detect(struct ata_port *ap)
/**
* sis_66_cable_detect - check for 40/80 pin
* @ap: Port
+ * @deadline: deadline jiffies for the operation
*
* Perform cable detection on the UDMA66, UDMA100 and early UDMA133
* SiS IDE controllers.
@@ -130,11 +132,12 @@ static int sis_66_cable_detect(struct ata_port *ap)
/**
* sis_pre_reset - probe begin
* @ap: ATA port
+ * @deadline: deadline jiffies for the operation
*
* Set up cable type and use generic probe init
*/
-static int sis_pre_reset(struct ata_port *ap)
+static int sis_old_pre_reset(struct ata_port *ap, unsigned long deadline)
{
static const struct pci_bits sis_enable_bits[] = {
{ 0x4aU, 1U, 0x02UL, 0x02UL }, /* port 0 */
@@ -145,7 +148,8 @@ static int sis_pre_reset(struct ata_port *ap)
if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no]))
return -ENOENT;
- return ata_std_prereset(ap);
+
+ return ata_std_prereset(ap, deadline);
}
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