Tejun Heo <htejun@xxxxxxxxx> wrote: > SB600 claims it can do 64bit DMA but it can't. Disable it. > > DON'T APPLY YET > --- > > Srihari, can you test this against 2.6.22-rc1-git7 just in case? I'll > send this upstream after you ack. Tejun, Of course. Yes, it's working great without mem=4095M parameter on AMD690G chipset (Asus M2A-VM) with 4 GB of RAM & Seagate SATA drives on SB600 AHCI SATA controller (against the current http://www.kernel.org/hg/linux-2.6 repo at changeset 56901:02db36c53917, which I believe is 2.6.22-rc1-git7 equivalent). :-) > Thanks. Thank you. > ahci.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c > index e00e1b9..bb94047 100644 > --- a/drivers/ata/ahci.c > +++ b/drivers/ata/ahci.c > @@ -170,6 +170,7 @@ enum { > AHCI_FLAG_IGN_IRQ_IF_ERR = (1 << 25), /* ignore IRQ_IF_ERR */ > AHCI_FLAG_HONOR_PI = (1 << 26), /* honor PORTS_IMPL */ > AHCI_FLAG_IGN_SERR_INTERNAL = (1 << 27), /* ignore SERR_INTERNAL */ > + AHCI_FLAG_32BIT_ONLY = (1 << 28), /* force 32bit */ > > AHCI_FLAG_COMMON = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | > ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | > @@ -354,7 +355,8 @@ static const struct ata_port_info ahci_p > /* board_ahci_sb600 */ > { > .flags = AHCI_FLAG_COMMON | > - AHCI_FLAG_IGN_SERR_INTERNAL, > + AHCI_FLAG_IGN_SERR_INTERNAL | > + AHCI_FLAG_32BIT_ONLY, > .pio_mask = 0x1f, /* pio0-4 */ > .udma_mask = 0x7f, /* udma0-6 ; FIXME */ > .port_ops = &ahci_ops, > @@ -492,6 +494,13 @@ static void ahci_save_initial_config(str > hpriv->saved_cap = cap = readl(mmio + HOST_CAP); > hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL); > > + /* some chips lie about 64bit support */ > + if ((cap & HOST_CAP_64) && (pi->flags & AHCI_FLAG_32BIT_ONLY)) { > + dev_printk(KERN_INFO, &pdev->dev, > + "controller can't do 64bit DMA, forcing 32bit\n"); > + cap &= ~HOST_CAP_64; > + } > + > /* fixup zero port_map */ > if (!port_map) { > port_map = (1 << ahci_nr_ports(hpriv->cap)) - 1; > ___________________________________________________________________________________ How would you spend $50,000 to create a more sustainable environment in Australia? Go to Yahoo!7 Answers and share your idea. http://advision.webevents.yahoo.com/aunz/lifestyle/answers/y7ans-babp_reg.html - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
