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Len Brown reported the system resume time is taking more than 2 seconds in bug - https://bugzilla.kernel.org/show_bug.cgi?id=185621. The reason of the 2 seconds is due to the firmware download time. The chip is booted up in the default reference clock speed to handle the firmware download to chip memory and advanced to the support higher speed clock to run the firmware after all. The default reference clock in the hardware is slow so that the firmware download time is taking up to 2 seconds for a 600KB firmware file. [76796.349701] ath10k_pci : boot uploading firmware image len 688691 [76798.334612] ath10k_pci : htt tx max num pending tx 1056 The resolution here is to enable the higher speed clock if the hardware supported before the firmware download at BMI stage, so that the hardware can handle the firmare download in a more efficient way. This can help to improve the firmware download time from 2 seconds to around 500ms for the same 600KB firmware file. [322858.577919] ath10k_pci boot uploading firmware image len 688691 [322859.093094] ath10k_pci htt tx max num pending tx 1056 The steps to advance to the higher speed clock is very hardware specific, so adding the hardware ops for the hardware that can support this. Reported-by: Len Brown <lenb@kernel.org> Tested-by: Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by: Ryan Hsu <ryanhsu@qca.qualcomm.com> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.