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Diffstat (limited to 'drivers/ata/pata_via.c')
-rw-r--r--drivers/ata/pata_via.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index 708ed144ede..8fdb2ce7321 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -98,7 +98,8 @@ static const struct via_isa_bridge {
u8 rev_max;
u16 flags;
} via_isa_bridges[] = {
- { "vx800", PCI_DEVICE_ID_VIA_VX800, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
+ { "vx800", PCI_DEVICE_ID_VIA_VX800, 0x00, 0x2f, VIA_UDMA_133 |
+ VIA_BAD_AST | VIA_SATA_PATA },
{ "vt8237s", PCI_DEVICE_ID_VIA_8237S, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8251", PCI_DEVICE_ID_VIA_8251, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "cx700", PCI_DEVICE_ID_VIA_CX700, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_SATA_PATA },
@@ -322,6 +323,29 @@ static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
}
+/**
+ * via_tf_load - send taskfile registers to host controller
+ * @ap: Port to which output is sent
+ * @tf: ATA taskfile register set
+ *
+ * Outputs ATA taskfile to standard ATA host controller.
+ *
+ * Note: This is to fix the internal bug of via chipsets, which
+ * will reset the device register after changing the IEN bit on
+ * ctl register
+ */
+static void via_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+ struct ata_taskfile tmp_tf;
+
+ if (ap->ctl != ap->last_ctl && !(tf->flags & ATA_TFLAG_DEVICE)) {
+ tmp_tf = *tf;
+ tmp_tf.flags |= ATA_TFLAG_DEVICE;
+ tf = &tmp_tf;
+ }
+ ata_sff_tf_load(ap, tf);
+}
+
static struct scsi_host_template via_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
@@ -332,6 +356,7 @@ static struct ata_port_operations via_port_ops = {
.set_piomode = via_set_piomode,
.set_dmamode = via_set_dmamode,
.prereset = via_pre_reset,
+ .sff_tf_load = via_tf_load,
};
static struct ata_port_operations via_port_ops_noirq = {