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Commit 56e71efe authored by Feng Tang's avatar Feng Tang Committed by Pierre Ossman
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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: default avatarFeng Tang <feng.tang@intel.com>
Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent 2df3b71b

drivers/mmc/host/sdhci.c

+7 −2
Original line number Diff line number Diff line
@@ -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. "