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usb: host: ehci-platform: Add workaround for brcm, xgs-iproc-ehci

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The ehci controller found in some Broadcom switches with integrated SoCs
has an issue which causes a soft lockup with large transfers like you
see when running ext4 on USB3 flash drive.

Port the fix from the Broadcom XLDK to increase the OUT_THRESHOLD to
avoid the problem.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200913215926.29880-1-chris.packham@alliedtelesis.co.nz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Packham 2020-09-14 09:59:26 +12:00 committed by Greg Kroah-Hartman
parent fccee0bace
commit dfee57a8a6
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/host/ehci-platform.c
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@ -42,6 +42,9 @@
#define EHCI_MAX_CLKS 4
#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
#define BCM_USB_FIFO_THRESHOLD 0x00800040
#define bcm_iproc_insnreg01 hostpc[0]
struct ehci_platform_priv {
struct clk *clks[EHCI_MAX_CLKS];
struct reset_control *rsts;
@ -75,6 +78,11 @@ static int ehci_platform_reset(struct usb_hcd *hcd)
if (pdata->no_io_watchdog)
ehci->need_io_watchdog = 0;
if (of_device_is_compatible(pdev->dev.of_node, "brcm,xgs-iproc-ehci"))
ehci_writel(ehci, BCM_USB_FIFO_THRESHOLD,
&ehci->regs->bcm_iproc_insnreg01);
return 0;
}