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Peter Chen 4bf2dd6513 usb: cdns3: gadget: toggle cycle bit before reset endpoint 
If there are TRBs pending during reset endpoint operation, the
DMA will advance after reset operation, but it isn't expected,
since the data is not yet available (For OUT, the data is not
yet available). After the data is ready, there won't be any
interrupt since the EP_TRADDR already points to next TRB entry
and doorbell is not set.

To fix it, it toggles cycle bit before reset operation, and restores
it after reset, it could avoid unexpected DMA advance due to
cycle bit is for software during the endpoint reset operation.

Fixes: 7733f6c32e ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200219141455.23257-3-peter.chen@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-03-04 10:56:26 +01:00
arch csky updates for 5.6-rc3 2020-02-23 09:37:41 -08:00
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Documentation fs/zonefs patches for 5.6-rc3 2020-02-22 11:38:20 -08:00
drivers usb: cdns3: gadget: toggle cycle bit before reset endpoint 2020-03-04 10:56:26 +01:00
fs for-5.6-rc2-tag 2020-02-23 09:43:50 -08:00
include Two fixes for the irq core code which are follow ups to the recent MSI 2020-02-22 17:25:46 -08:00
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kernel Two fixes for the irq core code which are follow ups to the recent MSI 2020-02-22 17:25:46 -08:00
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Makefile Linux 5.6-rc3 2020-02-23 16:17:42 -08:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.