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usb: host: xhci-plat: Add support for XHCI_WRITE_64_HI_LO

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xHCI specification 5.1 "Register Conventions" states that 64 bit
registers should be written in low-high order. All writing operations
in xhci is done low-high order following the spec.

Add a new quirk to support workaround for high-low order.

Signed-off-by: Daehwan Jung <dh10.jung@samsung.com>
Link: https://lore.kernel.org/r/1718019553-111939-4-git-send-email-dh10.jung@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daehwan Jung 2024-06-10 20:39:13 +09:00 committed by Greg Kroah-Hartman
parent bc162403e3
commit a353686e7f
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/host/xhci-plat.c
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@ -256,6 +256,9 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
if (device_property_read_bool(tmpdev, "xhci-sg-trb-cache-size-quirk"))
xhci->quirks |= XHCI_SG_TRB_CACHE_SIZE_QUIRK;
if (device_property_read_bool(tmpdev, "write-64-hi-lo-quirk"))
xhci->quirks |= XHCI_WRITE_64_HI_LO;
device_property_read_u32(tmpdev, "imod-interval-ns",
&xhci->imod_interval);
}