Re: [PATCH] ath11k: Advertise PLATFORM_CAP_PCIE_GLOBAL_RESET in qmi msg

On 2021-10-11 14:30, Kalle Valo wrote:

Baochen Qiang [off-list ref] writes:

quoted

Inform firmware that host is capable of triggering a global reset.
This is requested by firmware team.

Why?

https://wireless.wiki.kernel.org/en/users/drivers/ath10k/submittingpatches#answer_to_why

In some scenarios like rmmod/insmod, HW target needs to be completely 
reset. On ARM platforms we can rely on WL_EN pin and other power 
regulators to do this. However on x86 or some third party platforms, 
this has to be done by ath11k host by writing HW register 
PCIE_SOC_GLOBAL_RESET. But the problem is that some HW registers can not 
be cleared/restored. With this flag PLATFORM_CAP_PCIE_GLOBAL_RESET in 
QMI host_cap message, firmware can do some platform specific operations 
to fix this issue.