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usb: host: xhci-tegra: Set DMA mask correctly 

The Falcon microcontroller that runs the XUSB firmware and which is
responsible for exposing the XHCI interface can address only 40 bits of
memory. Typically that's not a problem because Tegra devices don't have
enough system memory to exceed those 40 bits.

However, if the ARM SMMU is enable on Tegra186 and later, the addresses
passed to the XUSB controller can be anywhere in the 48-bit IOV address
space of the ARM SMMU. Since the DMA/IOMMU API starts allocating from
the top of the IOVA space, the Falcon microcontroller is not able to
load the firmware successfully.

Fix this by setting the DMA mask to 40 bits, which will force the DMA
API to map the buffer for the firmware to an IOVA that is addressable by
the Falcon.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/1566989697-13049-1-git-send-email-nkristam@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-colors
Nagarjuna Kristam 2019-08-28 16:24:57 +05:30 committed by Greg Kroah-Hartman
parent 1902a01e2b
commit 993cc87534
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/host/xhci-tegra.c
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@ -1194,6 +1194,16 @@ static int tegra_xusb_probe(struct platform_device *pdev)
tegra_xusb_config(tegra, regs);
/*
* The XUSB Falcon microcontroller can only address 40 bits, so set
* the DMA mask accordingly.
*/
err = dma_set_mask_and_coherent(tegra->dev, DMA_BIT_MASK(40));
if (err < 0) {
dev_err(&pdev->dev, "failed to set DMA mask: %d\n", err);
goto put_rpm;
}
err = tegra_xusb_load_firmware(tegra);
if (err < 0) {
dev_err(&pdev->dev, "failed to load firmware: %d\n", err);