RF GAIN OPTIMIZATION(9)

💖 RF Gain optimization(9) 💖

okay bestie, welcome to RF Gain optimization(9) from the Kernel API Manual — this is the page about making RF gain behave in different environments, and it's giving very specific radio homework. 💅

This code is used to optimize RF gain on different environments (temperature mostly) based on feedback from a power detector. That's the whole plot: power detector feedback goes in, RF gain optimization happens, and temperature is the environment getting the most attention. ✨

It's only used on RF5111 and RF5112, later RF chips seem to have auto adjustment on hw -notice they have a much smaller BANK 7 and no gain optimization ladder-.

🫶 tiny vibe check: that -notice is literally part of the original sentence, so it stays exactly like that. The later-chip situation is auto adjustment on hw, a much smaller BANK 7, and no gain optimization ladder.

For more infos, check out this patent doc "http://www.freepatentsonline.com/7400691.html" — yes, the URL is inside quotes in the original, so we're keeping the quotes. 🔥

This paper describes power drops as seen on the receiver due to probe packets. The link is wrapped across two lines in the original, so here it is exactly that shape:

"http://www.cnri.dit.ie/publications/ICT0820-20Practical20Issues
20of20Power20Control.pdf"

And this is the MadWiFi bug entry related to the above "http://madwifi-project.org/ticket/1659" with various measurements and diagrams. 👑

✨ SEE ALSO ✨

bestie, the reference list is long and it ate. every single one is here:

• Kernel file ./drivers/net/wireless/ath/ath5k/phy.c — PHY related functions(9)
• ath5k_hw_radio_revision(9)
• ath5k_channel_ok(9)
• ath5k_hw_chan_has_spur_noise(9)
• ath5k_hw_rfb_op(9)
• ath5k_hw_write_ofdm_timings(9)
• ath5k_hw_phy_disable(9)
• ath5k_hw_wait_for_synth(9)
• ath5k_hw_rfgain_opt_init(9)
• ath5k_hw_request_rfgain_probe(9)
• ath5k_hw_rf_gainf_corr(9)
• ath5k_hw_rf_check_gainf_readback(9)
• ath5k_hw_rf_gainf_adjust(9)
• ath5k_hw_gainf_calibrate(9)
• ath5k_hw_rfgain_init(9)
• ath5k_hw_rfregs_init(9)
• ath5k_hw_rf5110_chan2athchan(9)
• ath5k_hw_rf5110_channel(9)
• ath5k_hw_rf5111_chan2athchan(9)
• ath5k_hw_rf5111_channel(9)
• ath5k_hw_rf5112_channel(9)
• ath5k_hw_rf2425_channel(9)
• ath5k_hw_channel(9)
• PHY Calibration routines(9)
• ath5k_hw_read_measured_noise_floor(9)
• ath5k_hw_init_nfcal_hist(9)
• ath5k_hw_update_nfcal_hist(9)
• ath5k_hw_get_median_noise_floor(9)
• ath5k_hw_update_noise_floor(9)
• ath5k_hw_rf5110_calibrate(9)
• ath5k_hw_rf511x_iq_calibrate(9)
• ath5k_hw_phy_calibrate(9)
• ath5k_hw_set_spur_mitigation_filter(9)
• Antenna control(9)
• ath5k_hw_set_def_antenna(9)
• ath5k_hw_set_fast_div(9)
• ath5k_hw_set_antenna_switch(9)
• ath5k_hw_set_antenna_mode(9)
• ath5k_get_interpolated_value(9)
• ath5k_get_linear_pcdac_min(9)
• ath5k_create_power_curve(9)
• ath5k_get_chan_pcal_surrounding_piers(9)
• ath5k_get_rate_pcal_data(9)
• ath5k_get_max_ctl_power(9)
• Power to PCDAC table functions(9)
• ath5k_fill_pwr_to_pcdac_table(9)
• ath5k_combine_linear_pcdac_curves(9)
• ath5k_write_pcdac_table(9)
• Power to PDADC table functions(9)
• ath5k_combine_pwr_to_pdadc_curves(9)
• ath5k_write_pwr_to_pdadc_table(9)
• ath5k_setup_channel_powertable(9)
• ath5k_write_channel_powertable(9)
• Per-rate tx power setting(9)
• ath5k_setup_rate_powertable(9)
• ath5k_hw_txpower(9)
• ath5k_hw_set_txpower_limit(9)
• ath5k_hw_phy_init(9)

okay that's the page, bestie 🫶 — source/version: ./drivers/net/wireless/ath/ath5k; date: October 2026; footer title: RF Gain optimization(9). periodt. 💜