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| author | Jeff Garzik <jeff@garzik.org> | 2008-02-28 15:43:48 -0500 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2008-03-05 07:53:06 -0500 |
| commit | a878539ef994787c447a98c2e3ba0fe3dad984ec (patch) | |
| tree | 3c2b16121143c4dad805b048b2cee5d4c410384a /drivers | |
| parent | 6ddd68615ae9b21096545d7d6ab0f04113ae8b42 (diff) | |
| download | linux-a878539ef994787c447a98c2e3ba0fe3dad984ec.tar.bz2 | |
ahci: work around ATI SB600 h/w quirk
This addresses the recent ATI SB600 errata, where the hardware does
not like 256-length PRD entries during FPDMA (aka NCQ).
It hurts performance on SB600, but it is more important to get a
correct patch eliminating the data corruption/lockups, and then later
on tune for performance.
We simply limit each command to a maximum of 255 sectors, on SB600.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ata/ahci.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 1db93b619074..8a49835bd0f8 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -186,6 +186,7 @@ enum { AHCI_HFLAG_NO_MSI = (1 << 5), /* no PCI MSI */ AHCI_HFLAG_NO_PMP = (1 << 6), /* no PMP */ AHCI_HFLAG_NO_HOTPLUG = (1 << 7), /* ignore PxSERR.DIAG.N */ + AHCI_HFLAG_SECT255 = (1 << 8), /* max 255 sectors */ /* ap->flags bits */ @@ -255,6 +256,7 @@ static void ahci_vt8251_error_handler(struct ata_port *ap); static void ahci_p5wdh_error_handler(struct ata_port *ap); static void ahci_post_internal_cmd(struct ata_queued_cmd *qc); static int ahci_port_resume(struct ata_port *ap); +static void ahci_dev_config(struct ata_device *dev); static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl); static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag, u32 opts); @@ -294,6 +296,8 @@ static const struct ata_port_operations ahci_ops = { .check_altstatus = ahci_check_status, .dev_select = ata_noop_dev_select, + .dev_config = ahci_dev_config, + .tf_read = ahci_tf_read, .qc_defer = sata_pmp_qc_defer_cmd_switch, @@ -425,7 +429,7 @@ 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_NO_PMP), + AHCI_HFLAG_SECT255 | AHCI_HFLAG_NO_PMP), .flags = AHCI_FLAG_COMMON, .link_flags = AHCI_LFLAG_COMMON, .pio_mask = 0x1f, /* pio0-4 */ @@ -1176,6 +1180,14 @@ static void ahci_init_controller(struct ata_host *host) VPRINTK("HOST_CTL 0x%x\n", tmp); } +static void ahci_dev_config(struct ata_device *dev) +{ + struct ahci_host_priv *hpriv = dev->link->ap->host->private_data; + + if (hpriv->flags & AHCI_HFLAG_SECT255) + dev->max_sectors = 255; +} + static unsigned int ahci_dev_classify(struct ata_port *ap) { void __iomem *port_mmio = ahci_port_base(ap); |