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Add manual sclk/vddc setting supoort via pp_od_clk_voltage sysfs to maintain consistency with other asics. As cyan skillfish doesn't support DPM, there is only a single frequency and voltage to adjust. v2: maintain consistency and add command guide. v3: adjust user settings storage and coding style. Command guide: echo vc point sclk vddc > pp_od_clk_voltage "vc" - sclk voltage curve "point" - must be 0 "sclk" - target value of sclk(MHz), should be in safe range "vddc" - target value of vddc(mV), a 6.25(mV) stepping is recommended and should be in safe range (the real vddc is an approximation of target value) echo c > pp_od_clk_voltage "c" - commit the changes of sclk and vddc, only after the commit command, the target values set by "vc" command will take effect echo r > pp_od_clk_voltage "r" - reset sclk and vddc to default value, a subsequent commit command is needed to take effect Example: 1) Check default sclk and vddc $ cat pp_od_clk_voltage OD_SCLK: 0: 1800Mhz * OD_VDDC: 0: 862mV * OD_RANGE: SCLK: 1000Mhz 2000Mhz VDDC: 700mV 1129mV 2) Set sclk to 1500MHz and vddc to 700mV $ echo vc 0 1500 700 > pp_od_clk_voltage $ echo c > pp_od_clk_voltage $ cat pp_od_clk_voltage OD_SCLK: 0: 1500Mhz * OD_VDDC: 0: 693mV * OD_RANGE: SCLK: 1000Mhz 2000Mhz VDDC: 700mV 1129mV 3) Reset sclk and vddc to default $ echo r > pp_od_clk_voltage $ echo c > pp_od_clk_voltage $ cat pp_od_clk_voltage OD_SCLK: 0: 1800Mhz * OD_VDDC: 0: 874mV * OD_RANGE: SCLK: 1000Mhz 2000Mhz VDDC: 700mV 1129mV NOTE: We don't specify an explicit safe range, you can set any values between min and max at your own risk. Enjoy! Signed-off-by: Lang Yu <lang.yu@amd.com> Reviewed-by: Lijo Lazar <lijo.lazar@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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.