diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2012-04-23 13:54:36 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-23 12:05:44 -0700 |
| commit | 3d9545cc375d117554a9b35dfddadf9189c62775 (patch) | |
| tree | b01707d2e0901665f20bae0f0c5a0930af69651a /drivers/usb/host/ehci-sched.c | |
| parent | 09091a4d5f2dd378dcf71de50b48cdacc58a8ac0 (diff) | |
EHCI: maintain the ehci->command value properly
The ehci-hcd driver is a little haphazard about keeping track of the
state of the USBCMD register. The ehci->command field is supposed to
hold the register's value (apart from a few special bits) at all
times, but it isn't maintained properly.
This patch (as1543) cleans up the situation. It keeps ehci->command
up-to-date, and uses that value rather than reading the register from
the hardware whenever possible.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-sched.c')
| -rw-r--r-- | drivers/usb/host/ehci-sched.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index a60679cbbf8..ffe8fc3bc7e 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -481,7 +481,6 @@ static int tt_no_collision ( static int enable_periodic (struct ehci_hcd *ehci) { - u32 cmd; int status; if (ehci->periodic_sched++) @@ -497,8 +496,8 @@ static int enable_periodic (struct ehci_hcd *ehci) return status; } - cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE; - ehci_writel(ehci, cmd, &ehci->regs->command); + ehci->command |= CMD_PSE; + ehci_writel(ehci, ehci->command, &ehci->regs->command); /* posted write ... PSS happens later */ /* make sure ehci_work scans these */ @@ -511,7 +510,6 @@ static int enable_periodic (struct ehci_hcd *ehci) static int disable_periodic (struct ehci_hcd *ehci) { - u32 cmd; int status; if (--ehci->periodic_sched) @@ -537,8 +535,8 @@ static int disable_periodic (struct ehci_hcd *ehci) return status; } - cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE; - ehci_writel(ehci, cmd, &ehci->regs->command); + ehci->command &= ~CMD_PSE; + ehci_writel(ehci, ehci->command, &ehci->regs->command); /* posted write ... */ free_cached_lists(ehci); |