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authorStanley Chang <stanley_chang@realtek.com>2023-04-19 10:00:42 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-04-20 11:18:12 +0200
commitd21a797a3eeb2b001e07ff943e5611eab67a71a3 (patch)
tree37959799e8bc3e61a51edd64034bed77d93cb806 /drivers/usb/core/sysfs.c
parenta804a47658ced9e9cc6b6000846ddf208362f1b3 (diff)
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. Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> Signed-off-by: Stanley Chang <stanley_chang@realtek.com> Link: https://lore.kernel.org/r/20230419020044.15475-1-stanley_chang@realtek.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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