• Takashi Iwai's avatar
    xhci: Fix spurious wakeups after S5 on Haswell · 638298dc
    Takashi Iwai authored
    Haswell LynxPoint and LynxPoint-LP with the recent Intel BIOS show
    mysterious wakeups after shutdown occasionally.  After discussing with
    BIOS engineers, they explained that the new BIOS expects that the
    wakeup sources are cleared and set to D3 for all wakeup devices when
    the system is going to sleep or power off, but the current xhci driver
    doesn't do this properly (partly intentionally).
    
    This patch introduces a new quirk, XHCI_SPURIOUS_WAKEUP, for
    fixing the spurious wakeups at S5 by calling xhci_reset() in the xhci
    shutdown ops as done in xhci_stop(), and setting the device to PCI D3
    at shutdown and remove ops.
    
    The PCI D3 call is based on the initial fix patch by Oliver Neukum.
    
    [Note: Sarah changed the quirk name from XHCI_HSW_SPURIOUS_WAKEUP to
    XHCI_SPURIOUS_WAKEUP, since none of the other quirks have system names
    in them.  Sarah also fixed a collision with a quirk submitted around the
    same time, by changing the xhci->quirks bit from 17 to 18.]
    
    This patch should be backported to kernels as old as 3.0, that
    contain the commit 1c12443a "xhci: Add
    Lynx Point to list of Intel switchable hosts."
    
    Cc: Oliver Neukum <oneukum@suse.de>
    Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
    Cc: stable@vger.kernel.org
    638298dc
xhci-pci.c 11.6 KB