usb: dwc3: gadget: fix writing NYET threshold

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commit 01ea6bf5cb upstream.

Before writing a new value to the register, the old value needs to be
masked out for the new value to be programmed as intended, because at
least in some cases the reset value of that field is 0xf (max value).

At the moment, the dwc3 core initialises the threshold to the maximum
value (0xf), with the option to override it via a DT. No upstream DTs
seem to override it, therefore this commit doesn't change behaviour for
any upstream platform. Nevertheless, the code should be fixed to have
the desired outcome.

Do so.

Fixes: 80caf7d21a ("usb: dwc3: add lpm erratum support")
Cc: stable@vger.kernel.org # 5.10+ (needs adjustment for 5.4)
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20241209-dwc3-nyet-fix-v2-1-02755683345b@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

André Draszik 2024-12-09 11:49:53 +00:00 • committed by Greg Kroah-Hartman

parent 32af3bcca3

commit 20a5725627

2 changed files with 4 additions and 1 deletions

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1

drivers/usb/dwc3/core.h

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4

drivers/usb/dwc3/gadget.c

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