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USB: work around for EHCI with quirky periodic schedules

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a quirky chipset needs periodic schedules to run for a minimum
time before they can be disabled again. This enforces the requirement
with a time stamp and a calculated delay

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2009-11-27 15:17:59 +01:00 committed by Greg Kroah-Hartman
parent 8d6499e5bd
commit ee4ecb8ac6
4 changed files with 20 additions and 0 deletions
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2
drivers/usb/host/ehci-hcd.c
View file

@ -28,6 +28,7 @@
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/ktime.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
@ -676,6 +677,7 @@ static int ehci_run (struct usb_hcd *hcd)
ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
msleep(5);
up_write(&ehci_cf_port_reset_rwsem);
ehci->last_periodic_enable = ktime_get_real();
temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
ehci_info (ehci,

4
drivers/usb/host/ehci-pci.c
View file

@ -111,6 +111,10 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
switch (pdev->vendor) {
case PCI_VENDOR_ID_INTEL:
ehci->need_io_watchdog = 0;
if (pdev->device == 0x27cc) {
ehci->broken_periodic = 1;
ehci_info(ehci, "using broken periodic workaround\n");
}
break;
case PCI_VENDOR_ID_TDI:
if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {

12
drivers/usb/host/ehci-sched.c
View file

@ -475,6 +475,8 @@ static int enable_periodic (struct ehci_hcd *ehci)
/* make sure ehci_work scans these */
ehci->next_uframe = ehci_readl(ehci, &ehci->regs->frame_index)
% (ehci->periodic_size << 3);
if (unlikely(ehci->broken_periodic))
ehci->last_periodic_enable = ktime_get_real();
return 0;
}
@ -486,6 +488,16 @@ static int disable_periodic (struct ehci_hcd *ehci)
if (--ehci->periodic_sched)
return 0;
if (unlikely(ehci->broken_periodic)) {
/* delay experimentally determined */
ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
ktime_t now = ktime_get_real();
s64 delay = ktime_us_delta(safe, now);
if (unlikely(delay > 0))
udelay(delay);
}
/* did setting PSE not take effect yet?
* takes effect only at frame boundaries...
*/

2
drivers/usb/host/ehci.h
View file

@ -118,6 +118,7 @@ struct ehci_hcd { /* one per controller */
unsigned stamp;
unsigned random_frame;
unsigned long next_statechange;
ktime_t last_periodic_enable;
u32 command;
/* SILICON QUIRKS */
@ -127,6 +128,7 @@ struct ehci_hcd { /* one per controller */
unsigned big_endian_desc:1;
unsigned has_amcc_usb23:1;
unsigned need_io_watchdog:1;
unsigned broken_periodic:1;
/* required for usb32 quirk */
#define OHCI_CTRL_HCFS (3 << 6)