On Mon, May 20, 2019 at 11:39:09AM +0200, Tomislav Požega wrote:
From: Benjamin Berg benjamin@sipsolutions.net
Unfortunately ath10k does not generally allow modifying the coverage class with the stock firmware and Qualcomm has so far refused to implement this feature so that it can be properly supported in ath10k. If we however know the registers that need to be modified for proper operation with a higher coverage class, then we can do these modifications from the driver.
This is a hack and might cause subtle problems but as it's not enabled by default (only when user space changes the coverage class explicitly) it should not cause new problems for existing setups. But still this should be considered as an experimental feature and used with caution.
This patch implements the support for first generation cards (QCA9880, QCA9887 and so on) which are based on a core that is similar to ath9k. The registers are modified in place and need to be re-written every time the firmware sets them. To achieve this the register status is verified after certain WMI events from the firmware.
The coverage class may not be modified temporarily right after the card re-initializes the registers. This is for example the case during scanning.
Thanks to Sebastian Gottschall s.gottschall@dd-wrt.com for initially working on a userspace support for this. This patch wouldn't have been possible without this documentation.
Signed-off-by: Benjamin Berg benjamin@sipsolutions.net Signed-off-by: Simon Wunderlich sw@simonwunderlich.de Signed-off-by: Mathias Kretschmer mathias.kretschmer@fit.fraunhofer.de Signed-off-by: Kalle Valo kvalo@qca.qualcomm.com Signed-off-by: Tomislav Požega pozega.tomislav@gmail.com
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This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.
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