diff options
| -rw-r--r-- | drivers/ata/sata_highbank.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c index b20aa96b958d..c846fd3c5c09 100644 --- a/drivers/ata/sata_highbank.c +++ b/drivers/ata/sata_highbank.c @@ -196,10 +196,26 @@ static int highbank_initialize_phys(struct device *dev, void __iomem *addr) return 0; } +/* + * The Calxeda SATA phy intermittently fails to bring up a link with Gen3 + * Retrying the phy hard reset can work around the issue, but the drive + * may fail again. In less than 150 out of 15000 test runs, it took more + * than 10 tries for the link to be established (but never more than 35). + * Triple the maximum observed retry count to provide plenty of margin for + * rare events and to guarantee that the link is established. + * + * Also, the default 2 second time-out on a failed drive is too long in + * this situation. The uboot implementation of the same driver function + * uses a much shorter time-out period and never experiences a time out + * issue. Reducing the time-out to 500ms improves the responsiveness. + * The other timing constants were kept the same as the stock AHCI driver. + * This change was also tested 15000 times on 24 drives and none of them + * experienced a time out. + */ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class, unsigned long deadline) { - const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); + static const unsigned long timing[] = { 5, 100, 500}; struct ata_port *ap = link->ap; struct ahci_port_priv *pp = ap->private_data; u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG; @@ -207,7 +223,7 @@ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class, bool online; u32 sstatus; int rc; - int retry = 10; + int retry = 100; ahci_stop_engine(ap); |