Re: 2.6.9-rc1-mm5, ehci stuff gone

From: Greg KH
Date: Mon Sep 13 2004 - 22:59:50 EST

On Mon, Sep 13, 2004 at 11:07:19PM -0400, Gene Heskett wrote:
> Greetings;
>
> I've rebooted to 2.6.9-rc1-mm5, and found that my 2 printers, usb-2.0
> capable are not found. Reverting to -mm4 brings them back among the
> living.
>
> Here is an 'lsusb -v' while booted to -mm5:

cat /proc/bus/usb/devices is much easier to read in the future :)

Anyway, try the following patch from David Brownell, it fixed the ohci
issues that I had in my laptop, and will show up in the next -mm patch.

Let me know if this works or not for you.

thanks,

greg k-h

-------------------

From: david-b@xxxxxxxxxxx
Subject: [PATCH] USB: ohci init refactor

Please merge, some recent changes made problems
by making init take too long. This also adds a bit of
support for detecting the funky resume states that
happen with suspend-to-disk (like swsusp, pmdisk).


Refactor controller initialization ... this is most of the patch by volume.

- A time-critical section now runs with IRQs blocked, rather than being split
over two separate routines. (I've recently seen init failures because of
preemption in the middle of that 2msec timeout, presumably by khubd.)

- Bus glue for PCI, LH7A404, OMAP, and SA-1100 now shares more init logic;
that'll help shrink support for upcoming non-PCI patches too.

- Move the root hub register macros to the header (for debug build issue)

- More tweaks to the frame clock initialization, including slightly more
helpful diagnostics on "init err".

Better SWSUSP support.

- Detects and handles some funky "resume after suspend-to-disk" cases. These
need to go through full driver re-init.

- Restore root hub to CONFIGURED state on resume.

Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <greg@xxxxxxxxx>

diff -Nru a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
--- a/drivers/usb/host/ohci-hcd.c 2004-09-13 20:54:04 -07:00
+++ b/drivers/usb/host/ohci-hcd.c 2004-09-13 20:54:04 -07:00
@@ -138,6 +138,11 @@

#include "ohci.h"

+static void ohci_dump (struct ohci_hcd *ohci, int verbose);
+static int ohci_init (struct ohci_hcd *ohci);
+static int ohci_restart (struct ohci_hcd *ohci);
+static void ohci_stop (struct usb_hcd *hcd);
+
#include "ohci-hub.c"
#include "ohci-dbg.c"
#include "ohci-mem.c"
@@ -397,33 +402,27 @@
return OHCI_FRAME_NO(ohci->hcca);
}

+static void ohci_usb_reset (struct ohci_hcd *ohci)
+{
+ ohci->hc_control = ohci_readl (&ohci->regs->control);
+ ohci->hc_control &= OHCI_CTRL_RWC;
+ writel (ohci->hc_control, &ohci->regs->control);
+}
+
/*-------------------------------------------------------------------------*
* HC functions
*-------------------------------------------------------------------------*/

-/* reset the HC and BUS */
+/* init memory, and kick BIOS/SMM off */

-static int hc_reset (struct ohci_hcd *ohci)
+static int ohci_init (struct ohci_hcd *ohci)
{
u32 temp;
+ int ret;

- /* boot firmware should have set this up (5.1.1.3.1) */
- if (!ohci->fminterval) {
- u32 t2;
-
- temp = ohci_readl (&ohci->regs->fminterval);
- ohci->fminterval = temp & 0x3fff;
- if (ohci->fminterval != FI)
- ohci_dbg (ohci, "fminterval delta %d\n",
- ohci->fminterval - FI);
-
- t2 = FSMP (ohci->fminterval);
- temp >>= 16;
- if ((t2/2) < temp || temp > t2)
- temp = t2;
- ohci->fminterval |= temp << 16;
- /* also: power/overcurrent flags in roothub.a */
- }
+ disable (ohci);
+ ohci->regs = ohci->hcd.regs;
+ ohci->next_statechange = jiffies;

#ifndef IR_DISABLE
/* SMM owns the HC? not for long! */
@@ -442,14 +441,60 @@
msleep (10);
if (--temp == 0) {
ohci_err (ohci, "USB HC TakeOver failed!\n");
- return -1;
+ return -EBUSY;
}
}
+ ohci_usb_reset (ohci);
}
#endif

/* Disable HC interrupts */
writel (OHCI_INTR_MIE, &ohci->regs->intrdisable);
+ // flush the writes
+ (void) ohci_readl (&ohci->regs->control);
+
+ if (ohci->hcca)
+ return 0;
+
+ ohci->hcca = dma_alloc_coherent (ohci->hcd.self.controller,
+ sizeof *ohci->hcca, &ohci->hcca_dma, 0);
+ if (!ohci->hcca)
+ return -ENOMEM;
+
+ if ((ret = ohci_mem_init (ohci)) < 0)
+ ohci_stop (&ohci->hcd);
+
+ return ret;
+
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* Start an OHCI controller, set the BUS operational
+ * resets USB and controller
+ * enable interrupts
+ * connect the virtual root hub
+ */
+static int ohci_run (struct ohci_hcd *ohci)
+{
+ u32 mask, temp;
+ struct usb_device *udev;
+ struct usb_bus *bus;
+ int first = ohci->fminterval == 0;
+
+ disable (ohci);
+
+ /* boot firmware should have set this up (5.1.1.3.1) */
+ if (first) {
+
+ temp = ohci_readl (&ohci->regs->fminterval);
+ ohci->fminterval = temp & 0x3fff;
+ if (ohci->fminterval != FI)
+ ohci_dbg (ohci, "fminterval delta %d\n",
+ ohci->fminterval - FI);
+ ohci->fminterval |= FSMP (ohci->fminterval) << 16;
+ /* also: power/overcurrent flags in roothub.a */
+ }

/* Reset USB nearly "by the book". RemoteWakeupConnected
* saved if boot firmware (BIOS/SMM/...) told us it's connected
@@ -495,18 +540,22 @@
}
// flush those writes
(void) ohci_readl (&ohci->regs->control);
+ memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
+
+ /* 2msec timelimit here means no irqs/preempt */
+ spin_lock_irq (&ohci->lock);

/* HC Reset requires max 10 us delay */
writel (OHCI_HCR, &ohci->regs->cmdstatus);
temp = 30; /* ... allow extra time */
while ((ohci_readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
if (--temp == 0) {
+ spin_unlock_irq (&ohci->lock);
ohci_err (ohci, "USB HC reset timed out!\n");
return -1;
}
udelay (1);
}
- periodic_reinit (ohci);

/* now we're in the SUSPEND state ... must go OPERATIONAL
* within 2msec else HC enters RESUME
@@ -520,22 +569,7 @@
// flush those writes
(void) ohci_readl (&ohci->regs->control);
}
- return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* Start an OHCI controller, set the BUS operational
- * enable interrupts
- * connect the virtual root hub
- */
-static int hc_start (struct ohci_hcd *ohci)
-{
- u32 mask, tmp;
- struct usb_device *udev;
- struct usb_bus *bus;
-
- disable (ohci);
+ writel (ohci->fminterval, &ohci->regs->fminterval);

/* Tell the controller where the control and bulk lists are
* The lists are empty now. */
@@ -545,12 +579,17 @@
/* a reset clears this */
writel ((u32) ohci->hcca_dma, &ohci->regs->hcca);

+ periodic_reinit (ohci);
+
/* some OHCI implementations are finicky about how they init.
* bogus values here mean not even enumeration could work.
*/
if ((ohci_readl (&ohci->regs->fminterval) & 0x3fff0000) == 0
|| !ohci_readl (&ohci->regs->periodicstart)) {
- ohci_err (ohci, "init err\n");
+ spin_unlock_irq (&ohci->lock);
+ ohci_err (ohci, "init err (%08x %04x)\n",
+ ohci_readl (&ohci->regs->fminterval),
+ ohci_readl (&ohci->regs->periodicstart));
return -EOVERFLOW;
}

@@ -569,42 +608,48 @@
writel (mask, &ohci->regs->intrenable);

/* handle root hub init quirks ... */
- tmp = roothub_a (ohci);
- tmp &= ~(RH_A_PSM | RH_A_OCPM);
+ temp = roothub_a (ohci);
+ temp &= ~(RH_A_PSM | RH_A_OCPM);
if (ohci->flags & OHCI_QUIRK_SUPERIO) {
/* NSC 87560 and maybe others */
- tmp |= RH_A_NOCP;
- tmp &= ~(RH_A_POTPGT | RH_A_NPS);
+ temp |= RH_A_NOCP;
+ temp &= ~(RH_A_POTPGT | RH_A_NPS);
} else if (power_switching) {
/* act like most external hubs: use per-port power
* switching and overcurrent reporting.
*/
- tmp &= ~(RH_A_NPS | RH_A_NOCP);
- tmp |= RH_A_PSM | RH_A_OCPM;
+ temp &= ~(RH_A_NPS | RH_A_NOCP);
+ temp |= RH_A_PSM | RH_A_OCPM;
} else {
/* hub power always on; required for AMD-756 and some
* Mac platforms. ganged overcurrent reporting, if any.
*/
- tmp |= RH_A_NPS;
+ temp |= RH_A_NPS;
}
- writel (tmp, &ohci->regs->roothub.a);
+ writel (temp, &ohci->regs->roothub.a);
writel (RH_HS_LPSC, &ohci->regs->roothub.status);
writel (power_switching ? RH_B_PPCM : 0, &ohci->regs->roothub.b);
// flush those writes
(void) ohci_readl (&ohci->regs->control);

+ spin_unlock_irq (&ohci->lock);
+
// POTPGT delay is bits 24-31, in 2 ms units.
mdelay ((roothub_a (ohci) >> 23) & 0x1fe);
bus = hcd_to_bus (&ohci->hcd);
+ ohci->hcd.state = USB_STATE_RUNNING;

- if (bus->root_hub) {
- ohci->hcd.state = USB_STATE_RUNNING;
+ ohci_dump (ohci, 1);
+
+ udev = hcd_to_bus (&ohci->hcd)->root_hub;
+ if (udev) {
+ udev->dev.power.power_state = 0;
+ usb_set_device_state (udev, USB_STATE_CONFIGURED);
return 0;
}

/* connect the virtual root hub */
udev = usb_alloc_dev (NULL, bus, 0);
- ohci->hcd.state = USB_STATE_RUNNING;
if (!udev) {
disable (ohci);
ohci->hc_control &= ~OHCI_CTRL_HCFS;
@@ -620,7 +665,10 @@
writel (ohci->hc_control, &ohci->regs->control);
return -ENODEV;
}
+ if (ohci->power_budget)
+ hub_set_power_budget(udev, ohci->power_budget);

+ create_debug_files (ohci);
return 0;
}

@@ -657,8 +705,7 @@
// e.g. due to PCI Master/Target Abort

ohci_dump (ohci, 1);
- ohci->hc_control &= OHCI_CTRL_RWC; /* hcfs 0 = RESET */
- writel (ohci->hc_control, &ohci->regs->control);
+ ohci_usb_reset (ohci);
}

if (ints & OHCI_INTR_RD) {
@@ -712,10 +759,9 @@
ohci_dump (ohci, 1);

flush_scheduled_work();
- if (HCD_IS_RUNNING(ohci->hcd.state))
- hc_reset (ohci);
- else
- writel (OHCI_INTR_MIE, &ohci->regs->intrdisable);
+
+ ohci_usb_reset (ohci);
+ writel (OHCI_INTR_MIE, &ohci->regs->intrdisable);

remove_debug_files (ohci);
ohci_mem_cleanup (ohci);
@@ -734,7 +780,7 @@

#if defined(CONFIG_USB_SUSPEND) || defined(CONFIG_PM)

-static int hc_restart (struct ohci_hcd *ohci)
+static int ohci_restart (struct ohci_hcd *ohci)
{
int temp;
int i;
@@ -791,7 +837,7 @@
ohci->ed_controltail = NULL;
ohci->ed_bulktail = NULL;

- if ((temp = hc_reset (ohci)) < 0 || (temp = hc_start (ohci)) < 0) {
+ if ((temp = ohci_run (ohci)) < 0) {
ohci_err (ohci, "can't restart, %d\n", temp);
return temp;
} else {
@@ -803,10 +849,7 @@
while (i--)
writel (RH_PS_PSS,
&ohci->regs->roothub.portstatus [temp]);
- ohci->hcd.self.root_hub->dev.power.power_state = 0;
- ohci->hcd.state = USB_STATE_RUNNING;
ohci_dbg (ohci, "restart complete\n");
- ohci_dump (ohci, 1);
}
return 0;
}
@@ -842,4 +885,14 @@
|| defined (CONFIG_ARCH_LH7A404) \
)
#error "missing bus glue for ohci-hcd"
+#endif
+
+#if !defined(HAVE_HNP) && defined(CONFIG_USB_OTG)
+
+#warning non-OTG configuration, too many HCDs
+
+static void start_hnp(struct ohci_hcd *ohci)
+{
+ /* "can't happen" */
+}
#endif
diff -Nru a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
--- a/drivers/usb/host/ohci-hub.c 2004-09-13 20:54:04 -07:00
+++ b/drivers/usb/host/ohci-hub.c 2004-09-13 20:54:04 -07:00
@@ -2,7 +2,7 @@
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@xxxxxxxxx>
- * (C) Copyright 2000-2002 David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
+ * (C) Copyright 2000-2004 David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
*
* This file is licenced under GPL
*/
@@ -11,34 +11,8 @@

/*
* OHCI Root Hub ... the nonsharable stuff
- *
- * Registers don't need cpu_to_le32, that happens transparently
*/

-/* AMD-756 (D2 rev) reports corrupt register contents in some cases.
- * The erratum (#4) description is incorrect. AMD's workaround waits
- * till some bits (mostly reserved) are clear; ok for all revs.
- */
-#define read_roothub(hc, register, mask) ({ \
- u32 temp = ohci_readl (&hc->regs->roothub.register); \
- if (temp == -1) \
- disable (hc); \
- else if (hc->flags & OHCI_QUIRK_AMD756) \
- while (temp & mask) \
- temp = ohci_readl (&hc->regs->roothub.register); \
- temp; })
-
-static u32 roothub_a (struct ohci_hcd *hc)
- { return read_roothub (hc, a, 0xfc0fe000); }
-static inline u32 roothub_b (struct ohci_hcd *hc)
- { return ohci_readl (&hc->regs->roothub.b); }
-static inline u32 roothub_status (struct ohci_hcd *hc)
- { return ohci_readl (&hc->regs->roothub.status); }
-static u32 roothub_portstatus (struct ohci_hcd *hc, int i)
- { return read_roothub (hc, portstatus [i], 0xffe0fce0); }
-
-/*-------------------------------------------------------------------------*/
-
#define dbg_port(hc,label,num,value) \
ohci_dbg (hc, \
"%s roothub.portstatus [%d] " \
@@ -150,7 +124,7 @@
* hub from the non-usb side (PCI, SOC, etc) stopped
*/
root->dev.power.power_state = 3;
- root->state = USB_STATE_SUSPENDED;
+ usb_set_device_state (root, USB_STATE_SUSPENDED);
done:
spin_unlock_irq (&ohci->lock);
return status;
@@ -164,8 +138,6 @@
return ed;
}

-static int hc_restart (struct ohci_hcd *ohci);
-
/* caller owns root->serialize */
static int ohci_hub_resume (struct usb_hcd *hcd)
{
@@ -181,7 +153,12 @@

spin_lock_irq (&ohci->lock);
ohci->hc_control = ohci_readl (&ohci->regs->control);
- switch (ohci->hc_control & OHCI_CTRL_HCFS) {
+ if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
+ /* this can happen after suspend-to-disk */
+ ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
+ ohci->hc_control);
+ status = -EBUSY;
+ } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_SUSPEND:
ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
ohci->hc_control |= OHCI_USB_RESUME;
@@ -203,8 +180,10 @@
status = -EBUSY;
}
spin_unlock_irq (&ohci->lock);
- if (status == -EBUSY)
- return hc_restart (ohci);
+ if (status == -EBUSY) {
+ (void) ohci_init (ohci);
+ return ohci_restart (ohci);
+ }
if (status != -EINPROGRESS)
return status;

@@ -261,6 +240,7 @@
/* TRSMRCY */
msleep (10);
root->dev.power.power_state = 0;
+ usb_set_device_state (root, USB_STATE_CONFIGURED);

/* keep it alive for ~5x suspend + resume costs */
ohci->next_statechange = jiffies + msecs_to_jiffies (250);
diff -Nru a/drivers/usb/host/ohci-lh7a404.c b/drivers/usb/host/ohci-lh7a404.c
--- a/drivers/usb/host/ohci-lh7a404.c 2004-09-13 20:54:04 -07:00
+++ b/drivers/usb/host/ohci-lh7a404.c 2004-09-13 20:54:04 -07:00
@@ -229,38 +229,14 @@
int ret;

ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
-
- ohci->hcca = dma_alloc_coherent (hcd->self.controller,
- sizeof *ohci->hcca, &ohci->hcca_dma, 0);
- if (!ohci->hcca)
- return -ENOMEM;
-
- ohci_dbg (ohci, "ohci_lh7a404_start, ohci->hcca:%p",
- ohci->hcca);
-
- memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
-
- if ((ret = ohci_mem_init (ohci)) < 0) {
- ohci_stop (hcd);
+ if ((ret = ohci_init(ohci)) < 0)
return ret;
- }
- ohci->regs = hcd->regs;

- if (hc_reset (ohci) < 0) {
- ohci_stop (hcd);
- return -ENODEV;
- }
-
- if (hc_start (ohci) < 0) {
+ if ((ret = ohci_run (ohci)) < 0) {
err ("can't start %s", ohci->hcd.self.bus_name);
ohci_stop (hcd);
- return -EBUSY;
+ return ret;
}
- create_debug_files (ohci);
-
-#ifdef DEBUG
- ohci_dump (ohci, 1);
-#endif /*DEBUG*/
return 0;
}

diff -Nru a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
--- a/drivers/usb/host/ohci-omap.c 2004-09-13 20:54:04 -07:00
+++ b/drivers/usb/host/ohci-omap.c 2004-09-13 20:54:04 -07:00
@@ -428,40 +428,18 @@
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int ret;

- config = hcd->self.controller->platform_data;
- ohci->hcca = dma_alloc_coherent (hcd->self.controller,
- sizeof *ohci->hcca, &ohci->hcca_dma, 0);
- if (!ohci->hcca)
- return -ENOMEM;
-
- memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
- if ((ret = ohci_mem_init (ohci)) < 0) {
- ohci_stop (hcd);
+ if ((ret = ohci_init(ohci)) < 0)
return ret;
- }
- ohci->regs = hcd->regs;

+ config = hcd->self.controller->platform_data;
if (config->otg || config->rwc)
writel(OHCI_CTRL_RWC, &ohci->regs->control);

- if (hc_reset (ohci) < 0) {
- ohci_stop (hcd);
- return -ENODEV;
- }
-
- if (hc_start (ohci) < 0) {
+ if ((ret = ohci_run (ohci)) < 0) {
err ("can't start %s", ohci->hcd.self.bus_name);
ohci_stop (hcd);
- return -EBUSY;
+ return ret;
}
- if (ohci->power_budget)
- hub_set_power_budget(ohci->hcd.self.root_hub,
- ohci->power_budget);
- create_debug_files (ohci);
-
-#ifdef DEBUG
- ohci_dump (ohci, 1);
-#endif
return 0;
}

diff -Nru a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
--- a/drivers/usb/host/ohci-pci.c 2004-09-13 20:54:04 -07:00
+++ b/drivers/usb/host/ohci-pci.c 2004-09-13 20:54:04 -07:00
@@ -35,9 +35,7 @@
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);

- ohci->regs = hcd->regs;
- ohci->next_statechange = jiffies;
- return hc_reset (ohci);
+ return ohci_init (ohci);
}

static int __devinit
@@ -46,11 +44,6 @@
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int ret;

- ohci->hcca = dma_alloc_coherent (hcd->self.controller,
- sizeof *ohci->hcca, &ohci->hcca_dma, 0);
- if (!ohci->hcca)
- return -ENOMEM;
-
if(hcd->self.controller && hcd->self.controller->bus == &pci_bus_type) {
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);

@@ -104,31 +97,14 @@

}

- memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
- if ((ret = ohci_mem_init (ohci)) < 0) {
- ohci_stop (hcd);
- return ret;
- }
-
- /* NOTE: this is a second reset. the first one helps
- * keep bios/smm irqs from making trouble, but it was
- * probably more than 1msec ago...
+ /* NOTE: there may have already been a first reset, to
+ * keep bios/smm irqs from making trouble
*/
- if (hc_reset (ohci) < 0) {
- ohci_stop (hcd);
- return -ENODEV;
- }
-
- if (hc_start (ohci) < 0) {
+ if ((ret = ohci_run (ohci)) < 0) {
ohci_err (ohci, "can't start\n");
ohci_stop (hcd);
- return -EBUSY;
+ return ret;
}
- create_debug_files (ohci);
-
-#ifdef DEBUG
- ohci_dump (ohci, 1);
-#endif
return 0;
}

diff -Nru a/drivers/usb/host/ohci-sa1111.c b/drivers/usb/host/ohci-sa1111.c
--- a/drivers/usb/host/ohci-sa1111.c 2004-09-13 20:54:04 -07:00
+++ b/drivers/usb/host/ohci-sa1111.c 2004-09-13 20:54:04 -07:00
@@ -272,33 +272,14 @@
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int ret;

- ohci->hcca = dma_alloc_coherent (hcd->self.controller,
- sizeof *ohci->hcca, &ohci->hcca_dma, 0);
- if (!ohci->hcca)
- return -ENOMEM;
-
- memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
- if ((ret = ohci_mem_init (ohci)) < 0) {
- ohci_stop (hcd);
+ if ((ret = ohci_init(ohci)) < 0)
return ret;
- }
- ohci->regs = hcd->regs;

- if (hc_reset (ohci) < 0) {
- ohci_stop (hcd);
- return -ENODEV;
- }
-
- if (hc_start (ohci) < 0) {
+ if ((ret = ohci_run (ohci)) < 0) {
err ("can't start %s", ohci->hcd.self.bus_name);
ohci_stop (hcd);
- return -EBUSY;
+ return ret;
}
- create_debug_files (ohci);
-
-#ifdef DEBUG
- ohci_dump (ohci, 1);
-#endif
return 0;
}

diff -Nru a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
--- a/drivers/usb/host/ohci.h 2004-09-13 20:54:04 -07:00
+++ b/drivers/usb/host/ohci.h 2004-09-13 20:54:04 -07:00
@@ -42,7 +42,6 @@

/* create --> IDLE --> OPER --> ... --> IDLE --> destroy
* usually: OPER --> UNLINK --> (IDLE | OPER) --> ...
- * some special cases : OPER --> IDLE ...
*/
u8 state; /* ED_{IDLE,UNLINK,OPER} */
#define ED_IDLE 0x00 /* NOT linked to HC */
@@ -406,15 +405,14 @@
}

#define FI 0x2edf /* 12000 bits per frame (-1) */
-#define FSMP(fi) ((6 * ((fi) - 210)) / 7)
+#define FSMP(fi) (0x7fff & ((6 * ((fi) - 210)) / 7))
#define LSTHRESH 0x628 /* lowspeed bit threshold */

static inline void periodic_reinit (struct ohci_hcd *ohci)
{
u32 fi = ohci->fminterval & 0x0ffff;
- writel (ohci->fminterval, &ohci->regs->fminterval);
+
writel (((9 * fi) / 10) & 0x3fff, &ohci->regs->periodicstart);
- writel (LSTHRESH, &ohci->regs->lsthresh);
}

/*-------------------------------------------------------------------------*/
@@ -438,6 +436,8 @@
# define ohci_vdbg(ohci, fmt, args...) do { } while (0)
#endif

+/*-------------------------------------------------------------------------*/
+
#ifdef CONFIG_ARCH_LH7A404
/* Marc Singer: at the time this code was written, the LH7A404
* had a problem reading the USB host registers. This
@@ -457,3 +457,25 @@
return readl (regs);
}
#endif
+
+/* AMD-756 (D2 rev) reports corrupt register contents in some cases.
+ * The erratum (#4) description is incorrect. AMD's workaround waits
+ * till some bits (mostly reserved) are clear; ok for all revs.
+ */
+#define read_roothub(hc, register, mask) ({ \
+ u32 temp = ohci_readl (&hc->regs->roothub.register); \
+ if (temp == -1) \
+ disable (hc); \
+ else if (hc->flags & OHCI_QUIRK_AMD756) \
+ while (temp & mask) \
+ temp = ohci_readl (&hc->regs->roothub.register); \
+ temp; })
+
+static u32 roothub_a (struct ohci_hcd *hc)
+ { return read_roothub (hc, a, 0xfc0fe000); }
+static inline u32 roothub_b (struct ohci_hcd *hc)
+ { return ohci_readl (&hc->regs->roothub.b); }
+static inline u32 roothub_status (struct ohci_hcd *hc)
+ { return ohci_readl (&hc->regs->roothub.status); }
+static u32 roothub_portstatus (struct ohci_hcd *hc, int i)
+ { return read_roothub (hc, portstatus [i], 0xffe0fce0); }
-
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