sata_dwc_460ex: support hardreset
The hardreset operation is currently not supported. This causes
sometime the SATA driver does cause kernel crash because of
none-determined state.a This patch will fix the issue.
Signed-off-by: Thang Q. Nguyen <tqnguyen@apm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c
index 69f7cde..ae13ef1 100644
--- a/drivers/ata/sata_dwc_460ex.c
+++ b/drivers/ata/sata_dwc_460ex.c
@@ -1581,10 +1581,31 @@
static void sata_dwc_error_handler(struct ata_port *ap)
{
- ap->link.flags |= ATA_LFLAG_NO_HRST;
ata_sff_error_handler(ap);
}
+int sata_dwc_hardreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ struct sata_dwc_device *hsdev = HSDEV_FROM_AP(link->ap);
+ int ret;
+
+ ret = sata_sff_hardreset(link, class, deadline);
+
+ sata_dwc_enable_interrupts(hsdev);
+
+ /* Reconfigure the DMA control register */
+ out_le32(&hsdev->sata_dwc_regs->dmacr,
+ SATA_DWC_DMACR_TXRXCH_CLEAR);
+
+ /* Reconfigure the DMA Burst Transaction Size register */
+ out_le32(&hsdev->sata_dwc_regs->dbtsr,
+ SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
+ SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT));
+
+ return ret;
+}
+
/*
* scsi mid-layer and libata interface structures
*/
@@ -1604,6 +1625,7 @@
.inherits = &ata_sff_port_ops,
.error_handler = sata_dwc_error_handler,
+ .hardreset = sata_dwc_hardreset,
.qc_prep = sata_dwc_qc_prep,
.qc_issue = sata_dwc_qc_issue,