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authorMichael Hanselmann <linux-kernel@hansmi.ch>2007-05-31 23:34:27 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-12 16:34:29 -0700
commitd576bb9f2769b315a795f77f0c33322a976add7a (patch)
tree56d59afa4d1e96b519e81434bd09598f76bf1fee /drivers/usb/host
parent020363384adfb02f26c1c038a127ed3da3d5cf37 (diff)
USB: Fix NEC OHCI chip silicon bug
This patch fixes a silicon bug in some NEC OHCI chips. The bug appears at random times and is very, very difficult to reproduce. Without the following patch, Linux would shut the chip and its associated devices down. In Apple PowerBooks this leads to an unusable keyboard and mouse (SSH still working). The idea of restarting the chip is taken from public Darwin code. Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch> Cc: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/ohci-hcd.c51
-rw-r--r--drivers/usb/host/ohci-hub.c5
-rw-r--r--drivers/usb/host/ohci-mem.c1
-rw-r--r--drivers/usb/host/ohci-pci.c16
-rw-r--r--drivers/usb/host/ohci.h2
5 files changed, 61 insertions, 14 deletions
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index ce05e5f7bed..44717fab743 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -35,6 +35,7 @@
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/reboot.h>
+#include <linux/workqueue.h>
#include <asm/io.h>
#include <asm/irq.h>
@@ -82,6 +83,8 @@ static const char hcd_name [] = "ohci_hcd";
static void ohci_dump (struct ohci_hcd *ohci, int verbose);
static int ohci_init (struct ohci_hcd *ohci);
static void ohci_stop (struct usb_hcd *hcd);
+static int ohci_restart (struct ohci_hcd *ohci);
+static void ohci_quirk_nec_worker (struct work_struct *work);
#include "ohci-hub.c"
#include "ohci-dbg.c"
@@ -651,9 +654,20 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
}
if (ints & OHCI_INTR_UE) {
- disable (ohci);
- ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
// e.g. due to PCI Master/Target Abort
+ if (ohci->flags & OHCI_QUIRK_NEC) {
+ /* Workaround for a silicon bug in some NEC chips used
+ * in Apple's PowerBooks. Adapted from Darwin code.
+ */
+ ohci_err (ohci, "OHCI Unrecoverable Error, scheduling NEC chip restart\n");
+
+ ohci_writel (ohci, OHCI_INTR_UE, &regs->intrdisable);
+
+ schedule_work (&ohci->nec_work);
+ } else {
+ disable (ohci);
+ ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
+ }
ohci_dump (ohci, 1);
ohci_usb_reset (ohci);
@@ -755,23 +769,16 @@ static void ohci_stop (struct usb_hcd *hcd)
/*-------------------------------------------------------------------------*/
/* must not be called from interrupt context */
-
-#ifdef CONFIG_PM
-
static int ohci_restart (struct ohci_hcd *ohci)
{
int temp;
int i;
struct urb_priv *priv;
- /* mark any devices gone, so they do nothing till khubd disconnects.
- * recycle any "live" eds/tds (and urbs) right away.
- * later, khubd disconnect processing will recycle the other state,
- * (either as disconnect/reconnect, or maybe someday as a reset).
- */
spin_lock_irq(&ohci->lock);
disable (ohci);
- usb_root_hub_lost_power(ohci_to_hcd(ohci)->self.root_hub);
+
+ /* Recycle any "live" eds/tds (and urbs). */
if (!list_empty (&ohci->pending))
ohci_dbg(ohci, "abort schedule...\n");
list_for_each_entry (priv, &ohci->pending, pending) {
@@ -822,7 +829,27 @@ static int ohci_restart (struct ohci_hcd *ohci)
ohci_dbg(ohci, "restart complete\n");
return 0;
}
-#endif
+
+/*-------------------------------------------------------------------------*/
+
+/* NEC workaround */
+static void ohci_quirk_nec_worker(struct work_struct *work)
+{
+ struct ohci_hcd *ohci = container_of(work, struct ohci_hcd, nec_work);
+ int status;
+
+ status = ohci_init(ohci);
+ if (status != 0) {
+ ohci_err(ohci, "Restarting NEC controller failed "
+ "in ohci_init, %d\n", status);
+ return;
+ }
+
+ status = ohci_restart(ohci);
+ if (status != 0)
+ ohci_err(ohci, "Restarting NEC controller failed "
+ "in ohci_restart, %d\n", status);
+}
/*-------------------------------------------------------------------------*/
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index bb9cc595219..48e4b11f4d3 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -55,8 +55,6 @@ static void dl_done_list (struct ohci_hcd *);
static void finish_unlinks (struct ohci_hcd *, u16);
#ifdef CONFIG_PM
-static int ohci_restart(struct ohci_hcd *ohci);
-
static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
__releases(ohci->lock)
__acquires(ohci->lock)
@@ -191,6 +189,9 @@ __acquires(ohci->lock)
spin_unlock_irq (&ohci->lock);
(void) ohci_init (ohci);
status = ohci_restart (ohci);
+
+ usb_root_hub_lost_power(hcd->self.root_hub);
+
spin_lock_irq (&ohci->lock);
}
return status;
diff --git a/drivers/usb/host/ohci-mem.c b/drivers/usb/host/ohci-mem.c
index 2f20d3dc895..450c7b460c5 100644
--- a/drivers/usb/host/ohci-mem.c
+++ b/drivers/usb/host/ohci-mem.c
@@ -28,6 +28,7 @@ static void ohci_hcd_init (struct ohci_hcd *ohci)
ohci->next_statechange = jiffies;
spin_lock_init (&ohci->lock);
INIT_LIST_HEAD (&ohci->pending);
+ INIT_WORK (&ohci->nec_work, ohci_quirk_nec_worker);
}
/*-------------------------------------------------------------------------*/
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index 15013f4519a..a5e2eb85d07 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -111,6 +111,18 @@ static int ohci_quirk_toshiba_scc(struct usb_hcd *hcd)
#endif
}
+/* Check for NEC chip and apply quirk for allegedly lost interrupts.
+ */
+static int ohci_quirk_nec(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+
+ ohci->flags |= OHCI_QUIRK_NEC;
+ ohci_dbg (ohci, "enabled NEC chipset lost interrupt quirk\n");
+
+ return 0;
+}
+
/* List of quirks for OHCI */
static const struct pci_device_id ohci_pci_quirks[] = {
{
@@ -134,6 +146,10 @@ static const struct pci_device_id ohci_pci_quirks[] = {
.driver_data = (unsigned long)ohci_quirk_toshiba_scc,
},
{
+ PCI_DEVICE(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB),
+ .driver_data = (unsigned long)ohci_quirk_nec,
+ },
+ {
/* Toshiba portege 4000 */
.vendor = PCI_VENDOR_ID_AL,
.device = 0x5237,
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index c2b5ecfe5e9..4ada43cf138 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -397,8 +397,10 @@ struct ohci_hcd {
#define OHCI_QUIRK_BE_DESC 0x08 /* BE descriptors */
#define OHCI_QUIRK_BE_MMIO 0x10 /* BE registers */
#define OHCI_QUIRK_ZFMICRO 0x20 /* Compaq ZFMicro chipset*/
+#define OHCI_QUIRK_NEC 0x40 /* lost interrupts */
// there are also chip quirks/bugs in init logic
+ struct work_struct nec_work; /* Worker for NEC quirk */
};
/* convert between an hcd pointer and the corresponding ohci_hcd */