Re: [PATCH #upstream-fixes] libata: implement and use HORKAGE_NOSETXFER

[Tejun Heo <tj@kernel.org>]

Hello,

Alan Cox wrote:
>> 2. Skip SETXFER.  Any direct SATA connection to the device would work
>>    fine.
>>
>> 2. Ignore SETXFER timeout.  Probably would work for TF based
>>    controllers but it's largely untested for sata controllers and the
>>    behavior is likely undefined for more advanced controllers.
> 
>> So, #2 seems like the logical choice here.  If worst comes to worst
> 
> You have two #2's

Oops.

> but I agree that providing its for this specific drive
> and we document it carefully so people don't add it to stuff that is
> wrong then your first #2 is probably safest.
> 
> Possibly  HORKAGE_NO_SETXFER_SATA and check word 93 ?

How about something like the following?

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 045a486..2c6aeda 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3392,17 +3392,27 @@ int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
 
 static int ata_dev_set_mode(struct ata_device *dev)
 {
+	struct ata_port *ap = dev->link->ap;
 	struct ata_eh_context *ehc = &dev->link->eh_context;
+	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
 	const char *dev_err_whine = "";
 	int ign_dev_err = 0;
-	unsigned int err_mask;
+	unsigned int err_mask = 0;
 	int rc;
 
 	dev->flags &= ~ATA_DFLAG_PIO;
 	if (dev->xfer_shift == ATA_SHIFT_PIO)
 		dev->flags |= ATA_DFLAG_PIO;
 
-	err_mask = ata_dev_set_xfermode(dev);
+	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
+		dev_err_whine = " (SET_XFERMODE skipped)";
+	else {
+		if (nosetxfer)
+			ata_dev_printk(dev, KERN_WARNING,
+				       "NOSETXFER but PATA detected - can't "
+				       "skip SETXFER, might malfunction\n");
+		err_mask = ata_dev_set_xfermode(dev);
+	}
 
 	if (err_mask & ~AC_ERR_DEV)
 		goto fail;
@@ -4297,6 +4307,12 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
 	/* Devices which aren't very happy with higher link speeds */
 	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },
 
+	/*
+	 * Devices which choke on SETXFER.  Applies only if both the
+	 * device and controller are SATA.
+	 */
+	{ "PIONEER DVD-RW  DVRTD08",	"1.00",	ATA_HORKAGE_NOSETXFER },
+
 	/* End Marker */
 	{ }
 };
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 3d501db..2b641af 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -385,6 +385,7 @@ enum {
 						    not multiple of 16 bytes */
 	ATA_HORKAGE_FIRMWARE_WARN = (1 << 12),	/* firmware update warning */
 	ATA_HORKAGE_1_5_GBPS	= (1 << 13),	/* force 1.5 Gbps */
+	ATA_HORKAGE_NOSETXFER	= (1 << 14),
 
 	 /* DMA mask for user DMA control: User visible values; DO NOT
 	    renumber */

-- 
tejun