[PATCH] libata: use SATA speed down in ata_drive_probe_reset()
Make ata_drive_probe_reset() use SATA SPD configuration. Hardreset
will be force if speed renegotiation is necessary. Also, if a
hardreset fails, PHY speed is stepped down and hardreset is retried
until the lowest speed is reached.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 6348867..4fd2407 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -2578,7 +2578,7 @@
if (probeinit)
probeinit(ap);
- if (softreset) {
+ if (softreset && !ata_set_sata_spd_needed(ap)) {
rc = ata_do_reset(ap, softreset, postreset, 0, classes);
if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
goto done;
@@ -2587,9 +2587,17 @@
if (!hardreset)
goto done;
- rc = ata_do_reset(ap, hardreset, postreset, 0, classes);
- if (rc || classes[0] != ATA_DEV_UNKNOWN)
- goto done;
+ while (1) {
+ rc = ata_do_reset(ap, hardreset, postreset, 0, classes);
+ if (rc == 0) {
+ if (classes[0] != ATA_DEV_UNKNOWN)
+ goto done;
+ break;
+ }
+
+ if (ata_down_sata_spd_limit(ap))
+ goto done;
+ }
if (softreset)
rc = ata_do_reset(ap, softreset, postreset, 0, classes);