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In the vendor driver, the current channel power is queried from EEPROM_TXPOWER_BG1 and EEPROM_TXPOWER_BG2. And then the mixed value will be written into the low half-word of the TX_ALC_CFG_0 register. The high half-word of the TX_ALC_CFG_0 is a fixed value 0x2f2f. We can't get the accurate TX power. Based on my tests and the new MediaTek mt76 driver source code, the real TX power is approximately equal to channel_power + (max) rate_power. Usually max rate_power is the gain of the OFDM 6M rate, which can be readed from the offset EEPROM_TXPOWER_BYRATE +1. Based on these eeprom values, this patch adds basic TX power control for the MT7620 and limits its maximum TX power. This can avoid the link speed decrease caused by chip overheating. rt2800_config_alc() function has also been renamed to rt2800_config_alc_rt6352() because it's only used by RT6352 (MT7620). Notice: It's still need some work to sync the max channel power to the user interface. This part is missing from the rt2x00 driver framework. If we set the power exceed the calibration value, it won't take effect. Signed-off-by: Shiji Yang <yangshiji66@outlook.com> Acked-by: Stanislaw Gruszka <stf_xl@wp.pl> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://lore.kernel.org/r/TYAP286MB03159090ED14044215E59FD6BC10A@TYAP286MB0315.JPNP286.PROD.OUTLOOK.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.