--- drivers/ata/libata-core.c

+++ drivers/ata/libata-core.c

@@ -5504,6 +5504,7 @@ static int ata_host_request_pm(struct at

*/

int ata_host_suspend(struct ata_host *host, pm_message_t mesg)

{

+ unsigned int ehi_flags = ATA_EHI_QUIET;

int rc;

/*

@@ -5512,7 +5513,18 @@ int ata_host_suspend(struct ata_host *ho

*/

ata_lpm_enable(host);

- rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);

+ /*

+ * On some hardware, device fails to respond after spun down

+ * for suspend. As the device won't be used before being

+ * resumed, we don't need to touch the device. Ask EH to skip

+ * the usual stuff and proceed directly to suspend.

+ *

+ * http://thread.gmane.org/gmane.linux.ide/46764

+ */

+ if (mesg.event == PM_EVENT_SUSPEND)

+ ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;

+

+ rc = ata_host_request_pm(host, mesg, 0, ehi_flags, 1);

if (rc == 0)

host->dev->power.power_state = mesg;

return rc;