libata: Implement ATA_FLAG_NO_DIPM and apply it to mcp65
NVIDIA mcp65 familiy of controllers cause command timeouts when DIPM
is used. Implement ATA_FLAG_NO_DIPM and apply it.
This problem was reported by Stefan Bader in the following thread.
http://thread.gmane.org/gmane.linux.ide/48841
stable: applicable to 2.6.37 and 38.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Stefan Bader <stefan.bader@canonical.com>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 88cd22f..f26f2fe 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3316,6 +3316,7 @@
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
enum ata_lpm_policy old_policy = link->lpm_policy;
+ bool no_dipm = ap->flags & ATA_FLAG_NO_DIPM;
unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
unsigned int err_mask;
int rc;
@@ -3332,7 +3333,7 @@
*/
ata_for_each_dev(dev, link, ENABLED) {
bool hipm = ata_id_has_hipm(dev->id);
- bool dipm = ata_id_has_dipm(dev->id);
+ bool dipm = ata_id_has_dipm(dev->id) && !no_dipm;
/* find the first enabled and LPM enabled devices */
if (!link_dev)
@@ -3389,7 +3390,8 @@
/* host config updated, enable DIPM if transitioning to MIN_POWER */
ata_for_each_dev(dev, link, ENABLED) {
- if (policy == ATA_LPM_MIN_POWER && ata_id_has_dipm(dev->id)) {
+ if (policy == ATA_LPM_MIN_POWER && !no_dipm &&
+ ata_id_has_dipm(dev->id)) {
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_ENABLE, SATA_DIPM);
if (err_mask && err_mask != AC_ERR_DEV) {