Commit 934a4057 authored by Stanley Chang's avatar Stanley Chang Committed by Todd Kjos
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UPSTREAM: usb: dwc3: core: add support for disabling High-speed park mode



Setting the PARKMODE_DISABLE_HS bit in the DWC3_USB3_GUCTL1.
When this bit is set to '1' all HS bus instances in park mode are disabled

For some USB wifi devices, if enable this feature it will reduce the
performance. Therefore, add an option for disabling HS park mode by
device-tree.

In Synopsys's dwc3 data book:
In a few high speed devices when an IN request is sent within 900ns of the
ACK of the previous packet, these devices send a NAK. When connected to
these devices, if required, the software can disable the park mode if you
see performance drop in your system. When park mode is disabled,
pipelining of multiple packet is disabled and instead one packet at a time
is requested by the scheduler. This allows up to 12 NAKs in a micro-frame
and improves performance of these slow devices.

Bug: 300024866
Acked-by: default avatarThinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: default avatarStanley Chang <stanley_chang@realtek.com>
Link: https://lore.kernel.org/r/20230419020044.15475-1-stanley_chang@realtek.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarWilliam Wu <william.wu@rock-chips.com>
(cherry picked from commit d21a797a)
Change-Id: I43ee416e54779a073a0ba4057edf4be8bd7886de
Signed-off-by: default avatarKever Yang <kever.yang@rock-chips.com>
parent 8a597e7a
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