ahci: implement AHCI_HFLAG_NO_PMP

Of course some controllers lie about PMP support.  Black list them.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 35ede5c31b9f..af7bf2679088 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -176,6 +176,7 @@ enum {
         AHCI_HFLAG_32BIT_ONLY           = (1 << 3), /* force 32bit */
         AHCI_HFLAG_MV_PATA              = (1 << 4), /* PATA port */
         AHCI_HFLAG_NO_MSI               = (1 << 5), /* no PCI MSI */
+        AHCI_HFLAG_NO_PMP               = (1 << 6), /* no PMP */
 
         /* ap->flags bits */
         AHCI_FLAG_NO_HOTPLUG            = (1 << 24), /* ignore PxSERR.DIAG.N */
@@ -357,7 +358,7 @@ static const struct ata_port_info ahci_port_info[] = {
         },
         /* board_ahci_vt8251 */
         {
-                AHCI_HFLAGS     (AHCI_HFLAG_NO_NCQ),
+                AHCI_HFLAGS     (AHCI_HFLAG_NO_NCQ | AHCI_HFLAG_NO_PMP),
                 .flags          = AHCI_FLAG_COMMON,
                 .link_flags     = AHCI_LFLAG_COMMON | ATA_LFLAG_HRST_TO_RESUME,
                 .pio_mask       = 0x1f, /* pio0-4 */
@@ -376,7 +377,7 @@ static const struct ata_port_info ahci_port_info[] = {
         /* board_ahci_sb600 */
         {
                 AHCI_HFLAGS     (AHCI_HFLAG_IGN_SERR_INTERNAL |
-                                 AHCI_HFLAG_32BIT_ONLY),
+                                 AHCI_HFLAG_32BIT_ONLY | AHCI_HFLAG_NO_PMP),
                 .flags          = AHCI_FLAG_COMMON,
                 .link_flags     = AHCI_LFLAG_COMMON,
                 .pio_mask       = 0x1f, /* pio0-4 */
@@ -578,6 +579,12 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
                 cap &= ~HOST_CAP_NCQ;
         }
 
+        if ((cap && HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
+                dev_printk(KERN_INFO, &pdev->dev,
+                           "controller can't do PMP, turning off CAP_PMP\n");
+                cap &= ~HOST_CAP_PMP;
+        }
+
         /*
          * Temporary Marvell 6145 hack: PATA port presence
          * is asserted through the standard AHCI port