pata_via: Blacklist some combinations of Transcend Flash and via

Reported by Mikulas Patocka.

VIA VT82C586B + Transcend TS64GSSD25-M v0826 does not work in UDMA mode

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index 520d5a31f8a2..78eac276effb 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -337,6 +337,32 @@ static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 }
 
 /**
+ *      via_mode_filter         -       filter buggy device/mode pairs
+ *      @dev: ATA device
+ *      @mask: Mode bitmask
+ *
+ *      We need to apply some minimal filtering for old controllers and at least
+ *      one breed of Transcend SSD. Return the updated mask.
+ */
+
+static unsigned long via_mode_filter(struct ata_device *dev, unsigned long mask)
+{
+        struct ata_host *host = dev->link->ap->host;
+        const struct via_isa_bridge *config = host->private_data;
+        unsigned char model_num[ATA_ID_PROD_LEN + 1];
+
+        if (config->id == PCI_DEVICE_ID_VIA_82C586_0) {
+                ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
+                if (strcmp(model_num, "TS64GSSD25-M") == 0) {
+                        ata_dev_printk(dev, KERN_WARNING,
+        "disabling UDMA mode due to reported lockups with this device.\n");
+                        mask &= ~ ATA_MASK_UDMA;
+                }
+        }
+        return ata_bmdma_mode_filter(dev, mask);
+}
+
+/**
  *      via_tf_load - send taskfile registers to host controller
  *      @ap: Port to which output is sent
  *      @tf: ATA taskfile register set
@@ -427,6 +453,7 @@ static struct ata_port_operations via_port_ops = {
         .prereset       = via_pre_reset,
         .sff_tf_load    = via_tf_load,
         .port_start     = via_port_start,
+        .mode_filter    = via_mode_filter,
 };
 
 static struct ata_port_operations via_port_ops_noirq = {