usb: dwc3: core: Disable USB2 retry for DWC_usb31 1.80a and prior

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STAR 9001346572 addresses a USB 2.0 endpoint blocking issue in host mode
for controller versions DWC_usb31 1.70a and 1.80a. This issue affects
devices on both high-speed and full-speed bus instances. When all
endpoint caches are filled and a single active endpoint receives
continuous NAK responses, data transfers to other endpoints may get
blocked.

To resolve this, for controller versions DWC_usb31 1.70a and 1.80a, the
GUCTL3 bit[16] (USB2.0 Internal Retry Disable) is set to 1. This bit
disables the USB2.0 internal retry feature and ensures proper eviction
handling in the host controller endpoind cache. The GUCTL3[16] register
function is available only from DWC_usb31 version 1.70a.

Signed-off-by: Faisal Hassan <quic_faisalh@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20241129173422.20063-1-quic_faisalh@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Faisal Hassan 2024-11-29 23:04:22 +05:30 • committed by Greg Kroah-Hartman

parent a787bffff5

commit 04d5b4c23f

2 changed files with 21 additions and 0 deletions

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20

drivers/usb/dwc3/core.c

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1

drivers/usb/dwc3/core.h

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