Am 19.12.2014 um 14:53 schrieb Adrian Nicolau: > I understand this, and neither was I expecting that the REG_WRITE would > overwrite the common->clockrate value. My question can be rephrased: Why > are there two different clock rate values defined for AR9271: one of 117 > MHz which is written in the registry, and the other of 44 MHz which is > set in the ath9k_hw_set_clockrate function? There is no checking done in > this function for AR_SREV_9271 like the one made for AR_SREV_9287 [1] > which sets the clock at 117MHz as well. > > [1] > https://github.com/torvalds/linux/blob/master/drivers/net/wireless/ath/ath9k/hw.c#L46
Ach... ok. you right. pll related changes from the host are ignored: https://github.com/olerem/open-ath9k-htc-firmware/blob/master/target_firmware/wlan/if_ath.c#L1456 > Thank you, > Adrian > > On Fri, Dec 19, 2014 at 3:25 PM, Oleksij Rempel <li...@rempel-privat.de > <mailto:li...@rempel-privat.de>> wrote: > > Am 19.12.2014 um 10:21 schrieb Adrian Nicolau: > > Hello, > > > > I am using a TL-WN722N for a Wi-Fi ToF project; the SOC is AR9271 > and I > > obtained the ath9k_htc source code via backports version 3.17.1-1. For > > ToF measurements, the higher the clock rate of the SOC, the > better, and > > I know that AR9271 has a 117 MHz one. > > Reading through the code, in file ath/ath9k/hw.c, function > > ath9k_hw_set_clockrate [1] there is no entry for AS_SREV_9271, leaving > > the clockrate to be 44MHz in the common structure and throughout > execution. > > The 117MHz setting is done later in the code by writing to a > registry [2]. > > > > I am wondering why the writing to the registry is not reflected in the > > common structure as well. > > > > [1] > > https://github.com/torvalds/linux/blob/master/drivers/net/wireless/ath/ath9k/hw.c#L39 > > [2] > > https://github.com/torvalds/linux/blob/master/drivers/net/wireless/ath/ath9k/hw.c#L864 > > Because you are writing to wrong offset. > > REG_WRITE will do it to a memory region mapped to mac core for this SoC. > -- > Regards, > Oleksij > -- Regards, Oleksij
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