usb: dwc3: core: do not use 3.0 clock when operating in 2.0 mode

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In the 3.0 device core, if the core is programmed to operate in
2.0 only, then setting the GUCTL1.DEV_FORCE_20_CLK_FOR_30_CLK makes
the internal 2.0(utmi/ulpi) clock to be routed as the 3.0 (pipe)
clock. Enabling this feature allows the pipe3 clock to be not-running
when forcibly operating in 2.0 device mode.

Tested-by: Michael Riesch <michael.riesch@wolfvision.net>
Signed-off-by: Bin Yang <yangbin@rock-chips.com>
Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20220228135700.1089526-6-pgwipeout@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Bin Yang 2022-02-28 08:56:56 -05:00 • committed by Greg Kroah-Hartman

parent 62a13a9c00

commit 62b20e6e0d

2 changed files with 6 additions and 0 deletions

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5

drivers/usb/dwc3/core.c

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1

drivers/usb/dwc3/core.h

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