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UHCI: workaround for Asus motherboard 

This patch (as798) adds a workaround to uhci-hcd.  At least one Asus
motherboard is wired in such a way that any device attached to a
suspended UHCI controller will prevent the system from entering
suspend-to-RAM by immediately waking it up.  The only way around the
problem is to turn the controller off instead of suspending it.

This fixes Bugzilla #6193.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2006-10-10 10:54:00 -04:00 committed by Greg Kroah-Hartman
parent 96a518928e
commit b62df45169
1 changed files with 39 additions and 5 deletions
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44
drivers/usb/host/uhci-hcd.c
View File

@ -40,6 +40,7 @@
#include <linux/dma-mapping.h>
#include <linux/usb.h>
#include <linux/bitops.h>
#include <linux/dmi.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@ -196,12 +197,42 @@ static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
return 0;
}
static int remote_wakeup_is_broken(struct uhci_hcd *uhci)
{
static struct dmi_system_id broken_wakeup_table[] = {
{
.ident = "Asus A7V8X",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK"),
DMI_MATCH(DMI_BOARD_NAME, "A7V8X"),
DMI_MATCH(DMI_BOARD_VERSION, "REV 1.xx"),
}
},
{ }
};
int port;
/* One of Asus's motherboards has a bug which causes it to
* wake up immediately from suspend-to-RAM if any of the ports
* are connected. In such cases we will not set EGSM.
*/
if (dmi_check_system(broken_wakeup_table)) {
for (port = 0; port < uhci->rh_numports; ++port) {
if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
USBPORTSC_CCS)
return 1;
}
}
return 0;
}
static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
__releases(uhci->lock)
__acquires(uhci->lock)
{
int auto_stop;
int int_enable;
int int_enable, egsm_enable;
auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
@ -217,15 +248,18 @@ __acquires(uhci->lock)
}
/* Enable resume-detect interrupts if they work.
* Then enter Global Suspend mode, still configured.
* Then enter Global Suspend mode if _it_ works, still configured.
*/
egsm_enable = USBCMD_EGSM;
uhci->working_RD = 1;
int_enable = USBINTR_RESUME;
if (resume_detect_interrupts_are_broken(uhci)) {
if (remote_wakeup_is_broken(uhci))
egsm_enable = 0;
if (resume_detect_interrupts_are_broken(uhci) || !egsm_enable)
uhci->working_RD = int_enable = 0;
}
outw(int_enable, uhci->io_addr + USBINTR);
outw(USBCMD_EGSM | USBCMD_CF, uhci->io_addr + USBCMD);
outw(egsm_enable | USBCMD_CF, uhci->io_addr + USBCMD);
mb();
udelay(5);