Commit dfee57a8 authored by Chris Packham's avatar Chris Packham Committed by Greg Kroah-Hartman
Browse files

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



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: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200913215926.29880-1-chris.packham@alliedtelesis.co.nz


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fccee0ba

drivers/usb/host/ehci-platform.c

+8 −0
Original line number Diff line number Diff line
@@ -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;

}