ahci_platform: add STRICT_AHCI platform type

Some platforms need to make use of the AHCI_HFLAG_DELAY_ENGINE flag.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: stable@kernel.org

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 48be4e189163..0c86c77764bc 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -26,6 +26,7 @@
 enum ahci_type {
         AHCI,           /* standard platform ahci */
         IMX53_AHCI,     /* ahci on i.mx53 */
+        STRICT_AHCI,    /* delayed DMA engine start */
 };
 
 static struct platform_device_id ahci_devtype[] = {
@@ -36,6 +37,9 @@ static struct platform_device_id ahci_devtype[] = {
                 .name = "imx53-ahci",
                 .driver_data = IMX53_AHCI,
         }, {
+                .name = "strict-ahci",
+                .driver_data = STRICT_AHCI,
+        }, {
                 /* sentinel */
         }
 };
@@ -56,6 +60,13 @@ static const struct ata_port_info ahci_port_info[] = {
                 .udma_mask      = ATA_UDMA6,
                 .port_ops       = &ahci_pmp_retry_srst_ops,
         },
+        [STRICT_AHCI] = {
+                AHCI_HFLAGS     (AHCI_HFLAG_DELAY_ENGINE),
+                .flags          = AHCI_FLAG_COMMON,
+                .pio_mask       = ATA_PIO4,
+                .udma_mask      = ATA_UDMA6,
+                .port_ops       = &ahci_ops,
+        },
 };
 
 static struct scsi_host_template ahci_platform_sht = {