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sdhci: remove DMA capability check from controller's PCI Class reg 

Many host controllers don't fully follow the PCI spec to claim
whether they support DMA in PCI class register. Leave the driver
to judge it from the Capability register, quirks and module parameter

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Feng Tang 2007-09-29 14:15:05 +08:00 committed by Pierre Ossman
parent 2df3b71b27
commit 56e71efe44
1 changed files with 7 additions and 2 deletions
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9
drivers/mmc/host/sdhci.c
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@ -1299,13 +1299,18 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
host->flags |= SDHCI_USE_DMA;
} else if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
host->flags |= SDHCI_USE_DMA;
else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
DBG("Controller doesn't have DMA interface\n");
else if (!(caps & SDHCI_CAN_DO_DMA))
DBG("Controller doesn't have DMA capability\n");
else
host->flags |= SDHCI_USE_DMA;
if (((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA) &&
(host->flags & SDHCI_USE_DMA)) {
printk(KERN_WARNING "%s: Will use DMA "
"mode even though HW doesn't fully "
"claim to support it.\n", host->slot_descr);
}
if (host->flags & SDHCI_USE_DMA) {
if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
printk(KERN_WARNING "%s: No suitable DMA available. "