cecffd9e3c
commit d201c92bff90f3d3d0b079fc955378c15c0483cc upstream.
Correct the specified regulator-min-microvolt value for the buck DCDC_REG2
regulator, which is part of the Rockchip RK809 PMIC, in the Pine64 Quartz64
Model B board dts. According to the RK809 datasheet, version 1.01, this
regulator is capable of producing voltages as low as 0.5 V on its output,
instead of going down to 0.9 V only, which is additionally confirmed by the
regulator-min-microvolt values found in the board dts files for the other
supported boards that use the same RK809 PMIC.
This allows the DVFS to clock the GPU on the Quartz64 Model B below 700 MHz,
all the way down to 200 MHz, which saves some power and reduces the amount of
generated heat a bit, improving the thermal headroom and possibly improving
the bursty CPU and GPU performance on this board.
This also eliminates the following warnings in the kernel log:
core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: 825000, not supported by regulator
panfrost fde60000.gpu: _opp_add: OPP not supported by regulators (200000000)
core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: 825000, not supported by regulator
panfrost fde60000.gpu: _opp_add: OPP not supported by regulators (300000000)
core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: 825000, not supported by regulator
panfrost fde60000.gpu: _opp_add: OPP not supported by regulators (400000000)
core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: 825000, not supported by regulator
panfrost fde60000.gpu: _opp_add: OPP not supported by regulators (600000000)
Fixes: dcc8c66bef79 ("arm64: dts: rockchip: add Pine64 Quartz64-B device tree")
Cc: stable@vger.kernel.org
Reported-By: Diederik de Haas <didi.debian@cknow.org>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Tested-by: Diederik de Haas <didi.debian@cknow.org>
Link: https://lore.kernel.org/r/e70742ea2df432bf57b3f7de542d81ca22b0da2f.1716225483.git.dsimic@manjaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.