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| author | Mark Lord <liml@rtr.ca> | 2008-05-02 14:02:28 -0400 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-06 11:38:25 -0400 |
| commit | c46938ccfe35a58a0873715ee4c26fc9eb8d87b3 (patch) | |
| tree | 786202a85f5a93bc4514dfa395929a0396cfacb9 /drivers | |
| parent | 4c299ca3649ccf666819e7d4a27a68c39fa174f1 (diff) | |
| download | op-kernel-dev-c46938ccfe35a58a0873715ee4c26fc9eb8d87b3.zip op-kernel-dev-c46938ccfe35a58a0873715ee4c26fc9eb8d87b3.tar.gz | |
sata_mv use hweight16() for bit counting (V2)
Some tidying as suggested by Grant Grundler.
Nuke local bit-counting function from sata_mv in favour of using hweight16().
Also add a short explanation for the 15msec timeout used when waiting for empty/idle.
Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ata/sata_mv.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index b948dc8..bb73b22 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -65,6 +65,7 @@ #include <linux/platform_device.h> #include <linux/ata_platform.h> #include <linux/mbus.h> +#include <linux/bitops.h> #include <scsi/scsi_host.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> @@ -903,6 +904,10 @@ static void mv_wait_for_edma_empty_idle(struct ata_port *ap) /* * Wait for the EDMA engine to finish transactions in progress. + * No idea what a good "timeout" value might be, but measurements + * indicate that it often requires hundreds of microseconds + * with two drives in-use. So we use the 15msec value above + * as a rough guess at what even more drives might require. */ for (i = 0; i < timeout; ++i) { u32 edma_stat = readl(port_mmio + EDMA_STATUS_OFS); @@ -1640,17 +1645,6 @@ static unsigned int mv_get_err_pmp_map(struct ata_port *ap) return readl(port_mmio + SATA_TESTCTL_OFS) >> 16; } -static int mv_count_pmp_links(unsigned int pmp_map) -{ - unsigned int link_count = 0; - - while (pmp_map) { - link_count += (pmp_map & 1); - pmp_map >>= 1; - } - return link_count; -} - static void mv_pmp_eh_prep(struct ata_port *ap, unsigned int pmp_map) { struct ata_eh_info *ehi; @@ -1701,7 +1695,7 @@ static int mv_handle_fbs_ncq_dev_err(struct ata_port *ap) pp->delayed_eh_pmp_map = new_map; mv_pmp_eh_prep(ap, new_map & ~old_map); } - failed_links = mv_count_pmp_links(new_map); + failed_links = hweight16(new_map); ata_port_printk(ap, KERN_INFO, "%s: pmp_map=%04x qc_map=%04x " "failed_links=%d nr_active_links=%d\n", |
