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authorZhang Rui <rui.zhang@intel.com>2008-07-04 05:32:17 (GMT)
committerJeff Garzik <jgarzik@redhat.com>2008-07-14 19:59:33 (GMT)
commit24920c8a6358bf5532f1336b990b1c0fe2b599ee (patch)
tree576c2dcbde9c76e13585ed37208640fbd3dba005 /drivers/ata
parent1e9dbc9291738149577cc488fd441f061815e02e (diff)
downloadlinux-24920c8a6358bf5532f1336b990b1c0fe2b599ee.tar.xz
AHCI: speed up resume
During resume, sleep 1 second to wait for the HBA reset to finish is a waste of time. According to the AHCI 1.2 spec, We should poll the HOST_CTL register, and return error if the host reset is not finished within 1 second. Test results show that the HBA reset can be done quickly(in usecs). And this patch may save nearly 1 second during resume. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/ahci.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 65d4e96..4ff3f03 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1142,12 +1142,15 @@ static int ahci_reset_controller(struct ata_host *host)
readl(mmio + HOST_CTL); /* flush */
}
- /* reset must complete within 1 second, or
+ /*
+ * to perform host reset, OS should set HOST_RESET
+ * and poll until this bit is read to be "0".
+ * reset must complete within 1 second, or
* the hardware should be considered fried.
*/
- ssleep(1);
+ tmp = ata_wait_register(mmio + HOST_CTL, HOST_RESET,
+ HOST_RESET, 10, 1000);
- tmp = readl(mmio + HOST_CTL);
if (tmp & HOST_RESET) {
dev_printk(KERN_ERR, host->dev,
"controller reset failed (0x%x)\n", tmp);