Re: [PATCH 07/10] ehci-dbgp,ehci: Allow early or late use of thedbgp device

[Jason Wessel]

Alan Stern wrote:
> On Mon, 20 Jul 2009, Jason Wessel wrote:
>> +    /* optional debug port, normally in the first BAR */
>> +    temp = pci_find_capability(pdev, 0x0a);
> This isn't going to work very well on systems with non-PCI EHCI
> controllers.  Maybe you should leave debug-port detection in
> ehci-pci.c.  The controller doesn't get reset very much in any case.
>
 

The high level debug port detection still needed to move, but you are
correct, it needs to move with in the ehci-pci.c.

The ehci_reset() definitely clears the debug controller in the pci
probe call to ehci_pci_setup().  The debug port detect code just needs
to get called before the ehci_reset() in this case.

The repaired patch is inline below.

Thanks,
Jason.

---
From: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Subject: [PATCH] ehci-dbgp,ehci: Allow early or late use of the dbgp device

If the EHCI debug port is initialized and in use, the EHCI host
controller driver must follow two rules.

1) If the EHCI host driver issues a controller reset, the debug
   controller driver re-initialization must get called after the reset
   is completed.

2) The EHCI host driver should ignore any requests to the physical
   EHCI debug port when the EHCI debug port is in use.

The code to check for the debug port was moved from ehci_pci_reinit()
to ehci_pci_setup because it must get called prior to ehci_reset()
which will clear the debug port registers.

Signed-off-by: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>

---
 drivers/usb/early/ehci-dbgp.c |   23 +++++++++++++++++++++++
 drivers/usb/host/ehci-hcd.c   |    8 ++++++++
 drivers/usb/host/ehci-hub.c   |   10 ++++++++++
 drivers/usb/host/ehci-pci.c   |   39 +++++++++++++++++++--------------------
 include/linux/usb/ehci_def.h  |   10 ++++++++++
 5 files changed, 70 insertions(+), 20 deletions(-)

--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -239,6 +239,11 @@ static int ehci_reset (struct ehci_hcd *
 	int	retval;
 	u32	command = ehci_readl(ehci, &ehci->regs->command);
 
+	/* If the EHCI debug controller is active, special care must be
+	 * taken before and after a host controller reset */
+	if (ehci->debug && !dbgp_reset_prep())
+		ehci->debug = NULL;
+
 	command |= CMD_RESET;
 	dbg_cmd (ehci, "reset", command);
 	ehci_writel(ehci, command, &ehci->regs->command);
@@ -253,6 +258,9 @@ static int ehci_reset (struct ehci_hcd *
 	if (ehci_is_TDI(ehci))
 		tdi_reset (ehci);
 
+	if (ehci->debug)
+		dbgp_external_startup();
+
 	return retval;
 }
 
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -816,6 +816,15 @@ static int ehci_hub_control (
 	case SetPortFeature:
 		selector = wIndex >> 8;
 		wIndex &= 0xff;
+		if (unlikely(ehci->debug)) {
+			/* If the debug port is active any port
+			 * feature requests should get denied */
+			if ((readl(&ehci->debug->control) & DBGP_ENABLED) &&
+			    wIndex == HCS_DEBUG_PORT(ehci->hcs_params)) {
+				retval = -ENODEV;
+				goto error_exit;
+			}
+		}
 		if (!wIndex || wIndex > ports)
 			goto error;
 		wIndex--;
@@ -894,6 +903,7 @@ error:
 		/* "stall" on error */
 		retval = -EPIPE;
 	}
+error_exit:
 	spin_unlock_irqrestore (&ehci->lock, flags);
 	return retval;
 }
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -27,28 +27,8 @@
 /* called after powerup, by probe or system-pm "wakeup" */
 static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
 {
-	u32			temp;
 	int			retval;
 
-	/* optional debug port, normally in the first BAR */
-	temp = pci_find_capability(pdev, 0x0a);
-	if (temp) {
-		pci_read_config_dword(pdev, temp, &temp);
-		temp >>= 16;
-		if ((temp & (3 << 13)) == (1 << 13)) {
-			temp &= 0x1fff;
-			ehci->debug = ehci_to_hcd(ehci)->regs + temp;
-			temp = ehci_readl(ehci, &ehci->debug->control);
-			ehci_info(ehci, "debug port %d%s\n",
-				HCS_DEBUG_PORT(ehci->hcs_params),
-				(temp & DBGP_ENABLED)
-					? " IN USE"
-					: "");
-			if (!(temp & DBGP_ENABLED))
-				ehci->debug = NULL;
-		}
-	}
-
 	/* we expect static quirk code to handle the "extended capabilities"
 	 * (currently just BIOS handoff) allowed starting with EHCI 0.96
 	 */
@@ -192,6 +172,25 @@ static int ehci_pci_setup(struct usb_hcd
 		break;
 	}
 
+	/* optional debug port, normally in the first BAR */
+	temp = pci_find_capability(pdev, 0x0a);
+	if (temp) {
+		pci_read_config_dword(pdev, temp, &temp);
+		temp >>= 16;
+		if ((temp & (3 << 13)) == (1 << 13)) {
+			temp &= 0x1fff;
+			ehci->debug = ehci_to_hcd(ehci)->regs + temp;
+			temp = ehci_readl(ehci, &ehci->debug->control);
+			ehci_info(ehci, "debug port %d%s\n",
+				HCS_DEBUG_PORT(ehci->hcs_params),
+				(temp & DBGP_ENABLED)
+					? " IN USE"
+					: "");
+			if (!(temp & DBGP_ENABLED))
+				ehci->debug = NULL;
+		}
+	}
+
 	ehci_reset(ehci);
 
 	/* at least the Genesys GL880S needs fixup here */
--- a/drivers/usb/early/ehci-dbgp.c
+++ b/drivers/usb/early/ehci-dbgp.c
@@ -971,3 +971,26 @@ struct console early_dbgp_console = {
 	.flags =	CON_PRINTBUFFER,
 	.index =	-1,
 };
+
+int dbgp_reset_prep(void)
+{
+	u32 ctrl;
+
+	dbgp_not_safe = 1;
+	if (!ehci_debug)
+		return 0;
+
+	if (early_dbgp_console.index != -1 &&
+		!(early_dbgp_console.flags & CON_BOOT))
+		return 1;
+	/* This means the console is not initialized, or should get
+	 * shutdown so as to allow for reuse of the usb device, which
+	 * means it is time to shutdown the usb debug port. */
+	ctrl = readl(&ehci_debug->control);
+	if (ctrl & DBGP_ENABLED) {
+		ctrl &= ~(DBGP_CLAIM);
+		writel(ctrl, &ehci_debug->control);
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dbgp_reset_prep);
--- a/include/linux/usb/ehci_def.h
+++ b/include/linux/usb/ehci_def.h
@@ -167,6 +167,16 @@ extern struct console early_dbgp_console
 #ifdef CONFIG_EARLY_PRINTK_DBGP
 /* Call backs from ehci host driver to ehci debug driver */
 extern int dbgp_external_startup(void);
+extern int dbgp_reset_prep(void);
+#else
+static inline int dbgp_reset_prep(void)
+{
+	return 1;
+}
+static inline int dbgp_external_startup(void)
+{
+	return -1;
+}
 #endif
 
 #endif /* __LINUX_USB_EHCI_DEF_H */
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