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ahci: Check and set 64-bit DMA mask for platform AHCI driver 

The current platform AHCI driver does not set the dma_mask correctly
for 64-bit DMA capable AHCI controller. This patch checks the AHCI
capability bit and set the dma_mask and coherent_dma_mask accordingly.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Suman Tripathi <stripathi@apm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Suravee Suthikulpanit 2014-06-12 12:40:23 -05:00 committed by Tejun Heo
parent 94463a9cad
commit cc7a9e2756
1 changed files with 13 additions and 0 deletions
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13
drivers/ata/libahci_platform.c
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@ -364,6 +364,19 @@ int ahci_platform_init_host(struct platform_device *pdev,
ap->ops = &ata_dummy_port_ops;
}
if (hpriv->cap & HOST_CAP_64) {
rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
if (rc) {
rc = dma_coerce_mask_and_coherent(dev,
DMA_BIT_MASK(32));
if (rc) {
dev_err(dev, "Failed to enable 64-bit DMA.\n");
return rc;
}
dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n");
}
}
rc = ahci_reset_controller(host);
if (rc)
return rc;