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6d8d1124d7
The USB PHY in the Allwinner R40 SoC seems to rely on voltage on the VCC-TVIN/OUT supply pins for proper operation, on top of its own supply voltage on VCC-USB. Without a 3.3V voltage supplied to VCC-TV*, USB operation becomes unstable and can result in disconnects. The Forlinx FETA40i-C SoM connects both the VCC-TVOUT and VCC-TVIN pins to the ALDO1 rail of the PMIC, so we need to enable that rail for USB operation. Since there is no supply property in the DT bindings for the USB core, we need to always enable the regulator. This fixes unstable USB operation on boards using the Forlinx FETA40i-C module. Signed-off-by: Fuyao Kashizuku <fuyao@sjterm.com> Reviewed-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Link: https://lore.kernel.org/r/ZYqRZev1g_mztff2@debian.cyg Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com> |
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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.