• Yan-Hsuan Chuang's avatar
    rtw88: add deep power save support · 27e117e4
    Yan-Hsuan Chuang authored
    Deep power save allows firmware/hardware to operate in a
    lower power state. And the deep power save mode depends on
    LPS mode. So, before entering deep PS, driver must first
    enter LPS mode.
    
    Under Deep PS, most of hardware functions are shutdown,
    driver will not be able to read/write registers and transfer
    data to the device. Hence TX path must be protected by each
    interface. Take PCI for example, DMA engine should be idle,
    and no nore activities on the PCI bus.
    
    If driver wants to operate on the device, such as register
    read/write, it must first acquire the mutex lock and wake
    up from Deep PS, otherwise the behavior is undefined.
    Signed-off-by: default avatarYan-Hsuan Chuang <yhchuang@realtek.com>
    Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
    27e117e4
pci.c 34.7 KB