linux-kernel - Re: Some hints needed how to handle SATA ALPM failures

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Message-ID: <20110311110144.GF13038@htj.dyndns.org>
Date:	Fri, 11 Mar 2011 12:01:44 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Stefan Bader <stefan.bader@...onical.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Jeff Garzik <jgarzik@...ox.com>,
	Andy Whitcroft <apw@...onical.com>
Subject: Re: Some hints needed how to handle SATA ALPM failures

On Fri, Mar 11, 2011 at 11:27:54AM +0100, Stefan Bader wrote:
> > Yes, it is an Nvidia MCP67 in ahci mode. I can relay the question about
> > medium_power and yes we can try patches. If not the reporter, I can prepare
> > kernels and ask for testing.
> > One question in general would be whether (if it cannot be said for sure which
> > controller is good or not) it may be a good idea to add some whitelisting for
> > those known to work and disable (or limit the mode) for the unknown.

Does the following patch resolve the issue?

Thanks.

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index b8d96ce..da75ec3 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -150,7 +150,7 @@ static const struct ata_port_info ahci_port_info[] = {
 	{
 		AHCI_HFLAGS	(AHCI_HFLAG_NO_FPDMA_AA | AHCI_HFLAG_NO_PMP |
 				 AHCI_HFLAG_YES_NCQ),
-		.flags		= AHCI_FLAG_COMMON,
+		.flags		= AHCI_FLAG_COMMON | ATA_FLAG_NO_DIPM,
 		.pio_mask	= ATA_PIO4,
 		.udma_mask	= ATA_UDMA6,
 		.port_ops	= &ahci_ops,
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 17a6378..3021b95 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3276,6 +3276,7 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 	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;
@@ -3292,7 +3293,7 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 	 */
 	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)
@@ -3349,7 +3350,8 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 
 	/* 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) {
diff --git a/include/linux/libata.h b/include/linux/libata.h
index c9c5d7a..3ad1eeb 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -137,8 +137,6 @@ enum {
 	ATA_DFLAG_ACPI_PENDING	= (1 << 5), /* ACPI resume action pending */
 	ATA_DFLAG_ACPI_FAILED	= (1 << 6), /* ACPI on devcfg has failed */
 	ATA_DFLAG_AN		= (1 << 7), /* AN configured */
-	ATA_DFLAG_HIPM		= (1 << 8), /* device supports HIPM */
-	ATA_DFLAG_DIPM		= (1 << 9), /* device supports DIPM */
 	ATA_DFLAG_DMADIR	= (1 << 10), /* device requires DMADIR */
 	ATA_DFLAG_CFG_MASK	= (1 << 12) - 1,
 
@@ -203,6 +201,7 @@ enum {
 					      * management */
 	ATA_FLAG_SW_ACTIVITY	= (1 << 22), /* driver supports sw activity
 					      * led */
+	ATA_FLAG_NO_DIPM	= (1 << 23), /* host not happy with DIPM */
 
 	/* bits 24:31 of ap->flags are reserved for LLD specific flags */
 
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