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>

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 35ede5c..af7bf26 100644 (file)
--- 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