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Firmware credit flow control is enabled for WMI control services, which expects available tokens should be acquired before sending a command to the target. Also the token gets released when firmware receives the command. This credit-based flow limits driver to send WMI command only when the token available which is causing WMI commands to timeout and return -EAGAIN, whereas firmware has enough capability to process the WMI command. To fix this Tx starvation issue, introduce the ability to disable the credit flow for the WMI path. The driver sends WMI configuration for disabling credit flow to firmware by two ways. 1. By using a global flag (HTC_MSG_SETUP_COMPLETE_EX_ID msg type flags) 2. By using a local flag (ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL = 1 << 3) Ath11k uses both these configurations to disable credit flow for the WMI path completely. Also added a hw_param member for credit flow control by which we can enable or disable it based on per-target basis. Currently we are disabling credit flow for IPQ8074, IPQ6018, and QCN9074 as recommended by firmware. Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-01492-QCAHKSWPL_SILICONZ-1 Tested-on: IPQ6018 hw1.0 AHB WLAN.HK.2.4.0.1-00330-QCAHKSWPL_SILICONZ-1 Co-developed-by: Pravas Kumar Panda <kumarpan@codeaurora.org> Signed-off-by: Pravas Kumar Panda <kumarpan@codeaurora.org> Signed-off-by: P Praneesh <quic_ppranees@quicinc.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/1635156494-20059-1-git-send-email-quic_ppranees@quicinc.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.