From a07d499b4759881db1359dd8812eecd00b0e0a28 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 29 Jan 2009 20:31:33 +0900 Subject: libata: add @spd_limit to sata_down_spd_limit() Add @spd_limit to sata_down_spd_limit() so that the caller can specify the SPD limit it wants. This parameter doesn't get in the way even when it's too low. The closest possible limit is applied. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/ata/libata-core.c | 25 ++++++++++++++++++++----- drivers/ata/libata-eh.c | 10 +++++----- drivers/ata/libata-pmp.c | 2 +- drivers/ata/libata.h | 2 +- 4 files changed, 27 insertions(+), 12 deletions(-) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 564c03c..3c5965d 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -2777,7 +2777,7 @@ int ata_bus_probe(struct ata_port *ap) /* This is the last chance, better to slow * down than lose it. */ - sata_down_spd_limit(&ap->link); + sata_down_spd_limit(&ap->link, 0); ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); } } @@ -2873,21 +2873,27 @@ void ata_port_disable(struct ata_port *ap) /** * sata_down_spd_limit - adjust SATA spd limit downward * @link: Link to adjust SATA spd limit for + * @spd_limit: Additional limit * * Adjust SATA spd limit of @link downward. Note that this * function only adjusts the limit. The change must be applied * using sata_set_spd(). * + * If @spd_limit is non-zero, the speed is limited to equal to or + * lower than @spd_limit if such speed is supported. If + * @spd_limit is slower than any supported speed, only the lowest + * supported speed is allowed. + * * LOCKING: * Inherited from caller. * * RETURNS: * 0 on success, negative errno on failure */ -int sata_down_spd_limit(struct ata_link *link) +int sata_down_spd_limit(struct ata_link *link, u32 spd_limit) { u32 sstatus, spd, mask; - int rc, highbit; + int rc, bit; if (!sata_scr_valid(link)) return -EOPNOTSUPP; @@ -2906,8 +2912,8 @@ int sata_down_spd_limit(struct ata_link *link) return -EINVAL; /* unconditionally mask off the highest bit */ - highbit = fls(mask) - 1; - mask &= ~(1 << highbit); + bit = fls(mask) - 1; + mask &= ~(1 << bit); /* Mask off all speeds higher than or equal to the current * one. Force 1.5Gbps if current SPD is not available. @@ -2921,6 +2927,15 @@ int sata_down_spd_limit(struct ata_link *link) if (!mask) return -EINVAL; + if (spd_limit) { + if (mask & ((1 << spd_limit) - 1)) + mask &= (1 << spd_limit) - 1; + else { + bit = ffs(mask) - 1; + mask = 1 << bit; + } + } + link->sata_spd_limit = mask; ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n", diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 90092c1..685509b 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -1875,7 +1875,7 @@ static unsigned int ata_eh_speed_down(struct ata_device *dev, /* speed down? */ if (verdict & ATA_EH_SPDN_SPEED_DOWN) { /* speed down SATA link speed if possible */ - if (sata_down_spd_limit(link) == 0) { + if (sata_down_spd_limit(link, 0) == 0) { action |= ATA_EH_RESET; goto done; } @@ -2627,11 +2627,11 @@ int ata_eh_reset(struct ata_link *link, int classify, } if (try == max_tries - 1) { - sata_down_spd_limit(link); + sata_down_spd_limit(link, 0); if (slave) - sata_down_spd_limit(slave); + sata_down_spd_limit(slave, 0); } else if (rc == -EPIPE) - sata_down_spd_limit(failed_link); + sata_down_spd_limit(failed_link, 0); if (hardreset) reset = hardreset; @@ -3011,7 +3011,7 @@ static int ata_eh_handle_dev_fail(struct ata_device *dev, int err) /* This is the last chance, better to slow * down than lose it. */ - sata_down_spd_limit(ata_dev_phys_link(dev)); + sata_down_spd_limit(ata_dev_phys_link(dev), 0); if (dev->pio_mode > XFER_PIO_0) ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); } diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c index 98ca07a..619f2c3 100644 --- a/drivers/ata/libata-pmp.c +++ b/drivers/ata/libata-pmp.c @@ -729,7 +729,7 @@ static int sata_pmp_eh_recover_pmp(struct ata_port *ap, if (tries) { /* consecutive revalidation failures? speed down */ if (reval_failed) - sata_down_spd_limit(link); + sata_down_spd_limit(link, 0); else reval_failed = 1; diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h index 0a6f5be..cea8014 100644 --- a/drivers/ata/libata.h +++ b/drivers/ata/libata.h @@ -99,7 +99,7 @@ extern int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags); extern int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class, unsigned int readid_flags); extern int ata_dev_configure(struct ata_device *dev); -extern int sata_down_spd_limit(struct ata_link *link); +extern int sata_down_spd_limit(struct ata_link *link, u32 spd_limit); extern int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel); extern void ata_sg_clean(struct ata_queued_cmd *qc); extern void ata_qc_free(struct ata_queued_cmd *qc); -- cgit v1.1