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PMIC XO is the clock source for wifi rf clock in integrated wifi chipset ex: WCN3990. Due to board layout errors XO frequency drifts can cause wifi rf clock inaccuracy. XO calibration test tree in Factory Test Mode is used to find the best frequency offset(for example +/-2KHz )by programming XO trim register. This ensure system clock stays within required 20 ppm WLAN rf clock. Retrieve the xo trim offset via system firmware (e.g., device tree), especially in the case where the device doesn't have a useful EEPROM on which to store the calibrated XO offset (e.g., for integrated Wifi). Calibrated XO offset is sent to fw, which compensate the clock drift by programing the XO trim register. Signed-off-by: Govind Singh <govinds@codeaurora.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> |
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| .. | ||
| admtek | ||
| ath | ||
| atmel | ||
| broadcom | ||
| cisco | ||
| intel | ||
| intersil | ||
| marvell | ||
| mediatek | ||
| quantenna | ||
| ralink | ||
| realtek | ||
| rsi | ||
| st | ||
| ti | ||
| zydas | ||
| Kconfig | ||
| mac80211_hwsim.c | ||
| mac80211_hwsim.h | ||
| Makefile | ||
| ray_cs.c | ||
| ray_cs.h | ||
| rayctl.h | ||
| rndis_wlan.c | ||
| virt_wifi.c | ||
| wl3501_cs.c | ||
| wl3501.h | ||