Merge branch 'docs-next' of git://git.lwn.net/linux-2.6

[pandora-kernel.git] / drivers / ata / libata-pmp.c

diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
index 00305f4..224faab 100644 (file)
--- a/drivers/ata/libata-pmp.c
+++ b/drivers/ata/libata-pmp.c
@@ -231,10 +231,14 @@ static const char *sata_pmp_spec_rev_str(const u32 *gscr)
        return "<unknown>";
 }
 
+#define PMP_GSCR_SII_POL 129
+
 static int sata_pmp_configure(struct ata_device *dev, int print_info)
 {
        struct ata_port *ap = dev->link->ap;
        u32 *gscr = dev->gscr;
+       u16 vendor = sata_pmp_gscr_vendor(gscr);
+       u16 devid = sata_pmp_gscr_devid(gscr);
        unsigned int err_mask = 0;
        const char *reason;
        int nr_ports, rc;
@@ -260,12 +264,34 @@ static int sata_pmp_configure(struct ata_device *dev, int print_info)
                goto fail;
        }
 
+       /* Disable sending Early R_OK.
+        * With "cached read" HDD testing and multiple ports busy on a SATA
+        * host controller, 3726 PMP will very rarely drop a deferred
+        * R_OK that was intended for the host. Symptom will be all
+        * 5 drives under test will timeout, get reset, and recover.
+        */
+       if (vendor == 0x1095 && devid == 0x3726) {
+               u32 reg;
+
+               err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, &reg);
+               if (err_mask) {
+                       rc = -EIO;
+                       reason = "failed to read Sil3726 Private Register";
+                       goto fail;
+               }
+               reg &= ~0x1;
+               err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
+               if (err_mask) {
+                       rc = -EIO;
+                       reason = "failed to write Sil3726 Private Register";
+                       goto fail;
+               }
+       }
+
        if (print_info) {
                ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
                               "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
-                              sata_pmp_spec_rev_str(gscr),
-                              sata_pmp_gscr_vendor(gscr),
-                              sata_pmp_gscr_devid(gscr),
+                              sata_pmp_spec_rev_str(gscr), vendor, devid,
                               sata_pmp_gscr_rev(gscr),
                               nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
                               gscr[SATA_PMP_GSCR_FEAT]);