Re: [PATCH 1/1] usb,uhci: add a new tag for virtual uhci devices
On 06/28/2013 10:22 PM, Alan Stern wrote: On Fri, 28 Jun 2013, Li, Zhen-Hua (USL-China) wrote: There was a problem, the warning Controller not stopped yet. And your last patch for this problem does a wrong thing: It prevents all HP uhci devices from auto-stop, which make HP uhci devices waste more power. Do they really waste more power? Have you measured this? Is CONFIG_PM enabled in the kernel configuration? This is another new problem. I think this should be corrected, so I want to apply it. In the last email, you said that your patch did not make the machine act different. Now you say that your patch makes the machine use less power. Which statement is correct? Alan Stern Let's make it clear: I said I don't have a machine that this makes action different, it does not mean my patch did not make the machine act different . There are many kinds of machines, I have never said my patch does not make ALL of them act different. -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
On 04/27/2013 11:14 PM, Alan Stern wrote: On Sat, 27 Apr 2013, ZhenHua wrote: On 04/27/2013 12:51 AM, Alan Stern wrote: On Fri, 26 Apr 2013, ZhenHua wrote: There is a function wait_for_HP() in uhci-hub.c. In this patch, it is used in suspend_rh(), I think this can be a solution. And I have tested this patch, it can fix the bug. I think there is another patch needed. As Alan said in another mail, in the UHCI_RH_RUNNING_NODEVS case, it should not be stopped if the uhci device is HP iLo virtual usb. I believe that if you change the UHCI_RH_RUNNING_NODEVS case, you will find that this patch (calling wait_for_HP) isn't needed. In fact, the patch is so easy that I am including it below. Please test this (without either of your patches) to see if it works. Alan Stern Index: usb-3.9/drivers/usb/host/uhci-hub.c === --- usb-3.9.orig/drivers/usb/host/uhci-hub.c +++ usb-3.9/drivers/usb/host/uhci-hub.c @@ -225,7 +225,8 @@ static int uhci_hub_status_data(struct u /* auto-stop if nothing connected for 1 second */ if (any_ports_active(uhci)) uhci-rh_state = UHCI_RH_RUNNING; - else if (time_after_eq(jiffies, uhci-auto_stop_time)) + else if (time_after_eq(jiffies, uhci-auto_stop_time) + !uhci-wait_for_hp) suspend_rh(uhci, UHCI_RH_AUTO_STOPPED); break; I have tested the UHCI_RH_RUNNING_NODEVS case yeasterday, and it works. But the function suspend_rh is also called in other places, so I think it only fixes the warning when auto stop is called, but not fix the warning when uhci's bus_suspend is called, it will come out again. Have you tried this? I expect the warning will not occur when the bus_suspend routine is called, because then there will be a 1-ms delay, not just a 400-us delay. I tested this, and the warning is gone. Is this patch committed ? I need to paste the link to suse bugzilla. And if you add uhci-wait_for_hp check in the UHCI_RH_RUNNING_NODEVS case, all hp uhci devices will not auto stop, not only the virtual devices. I guess it may waste resource. If you want, you can add a new flag specifically for virtual controllers. But it shouldn't matter -- as long as your kernels are built with CONFIG_PM_RUNTIME enabled, there won't be any significant waste of resources. Alan Stern I think we can check the product id to determine whether a device is virtual. Do you know if there is another way to check this? Thanks Zhen-Hua -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
There is a function wait_for_HP() in uhci-hub.c. In this
patch, it is used in suspend_rh(), I think this can be a
solution. And I have tested this patch, it can fix the bug.
I think there is another patch needed. As Alan said in another
mail, in the UHCI_RH_RUNNING_NODEVS case, it should not be stopped
if the uhci device is HP iLo virtual usb.
Thanks
Zhen-Hua
On 04/26/2013 03:38 PM, Li, Zhen-Hua wrote:
This patch is trying to fix this bug on SLES11 SP2:
https://bugzilla.novell.com/show_bug.cgi?id=817035
On a large HP system with 64T memory and 60 logical cpus, when usb
driver inits the iLo Virtual USB Controller, there comes a warning
Controller not stopped yet!. It is because the HP iLo virtual usb
device requires a longer delay.
Signed-off-by: Li, Zhen-Hua zhen-h...@hp.com
---
drivers/usb/host/uhci-hcd.c |5 +
drivers/usb/host/uhci-hub.c | 12 +++-
2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 4a86b63..af30517 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -355,6 +355,11 @@ __acquires(uhci-lock)
if (uhci-dead)
return;
}
+
+ /* HP's iLo Virtual USB Controller requires a longer delay. */
+ if (uhci-wait_for_hp)
+ wait_for_HP(uhci, USBSTS, USBSTS_HCH, 1000);
+
if (!(uhci_readw(uhci, USBSTS) USBSTS_HCH))
dev_warn(uhci_dev(uhci), Controller not stopped yet!\n);
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c
index f87bee6..c3f772c 100644
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -120,14 +120,15 @@ static void uhci_finish_suspend(struct uhci_hcd *uhci,
int port,
}
/* Wait for the UHCI controller in HP's iLO2 server management chip.
- * It can take up to 250 us to finish a reset and set the CSC bit.
+ * It can take up to max_wait us to finish the operation.
*/
-static void wait_for_HP(struct uhci_hcd *uhci, unsigned long port_addr)
+static void wait_for_HP(struct uhci_hcd *uhci, unsigned long port_addr,
+ u16 status, int max_wait)
{
int i;
- for (i = 10; i 250; i += 10) {
- if (uhci_readw(uhci, port_addr) USBPORTSC_CSC)
+ for (i = 10; i max_wait; i += 10) {
+ if (uhci_readw(uhci, port_addr) status)
return;
udelay(10);
}
@@ -151,7 +152,8 @@ static void uhci_check_ports(struct uhci_hcd *uhci)
/* HP's server management chip requires
* a longer delay. */
if (uhci-wait_for_hp)
- wait_for_HP(uhci, port_addr);
+ wait_for_HP(uhci, port_addr,
+ USBPORTSC_CSC, 250);
/* If the port was enabled before, turning
* reset on caused a port enable change.
--
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Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
On 04/26/2013 03:50 PM, ZhenHua wrote:
I think there is another patch needed. As Alan said in another
mail, in the UHCI_RH_RUNNING_NODEVS case, it should not be stopped
if the uhci device is HP iLo virtual usb.
correct: it should not be auto stopped if the uhci device is HP iLo
virtual usb.
Thanks
Zhen-Hua
On 04/26/2013 03:38 PM, Li, Zhen-Hua wrote:
This patch is trying to fix this bug on SLES11 SP2:
https://bugzilla.novell.com/show_bug.cgi?id=817035
On a large HP system with 64T memory and 60 logical cpus, when usb
driver inits the iLo Virtual USB Controller, there comes a warning
Controller not stopped yet!. It is because the HP iLo virtual usb
device requires a longer delay.
Signed-off-by: Li, Zhen-Hua zhen-h...@hp.com
---
drivers/usb/host/uhci-hcd.c |5 +
drivers/usb/host/uhci-hub.c | 12 +++-
2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 4a86b63..af30517 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -355,6 +355,11 @@ __acquires(uhci-lock)
if (uhci-dead)
return;
}
+
+/* HP's iLo Virtual USB Controller requires a longer delay. */
+if (uhci-wait_for_hp)
+wait_for_HP(uhci, USBSTS, USBSTS_HCH, 1000);
+
if (!(uhci_readw(uhci, USBSTS) USBSTS_HCH))
dev_warn(uhci_dev(uhci), Controller not stopped yet!\n);
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c
index f87bee6..c3f772c 100644
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -120,14 +120,15 @@ static void uhci_finish_suspend(struct uhci_hcd
*uhci, int port,
}
/* Wait for the UHCI controller in HP's iLO2 server management chip.
- * It can take up to 250 us to finish a reset and set the CSC bit.
+ * It can take up to max_wait us to finish the operation.
*/
-static void wait_for_HP(struct uhci_hcd *uhci, unsigned long port_addr)
+static void wait_for_HP(struct uhci_hcd *uhci, unsigned long port_addr,
+u16 status, int max_wait)
{
int i;
-for (i = 10; i 250; i += 10) {
-if (uhci_readw(uhci, port_addr) USBPORTSC_CSC)
+for (i = 10; i max_wait; i += 10) {
+if (uhci_readw(uhci, port_addr) status)
return;
udelay(10);
}
@@ -151,7 +152,8 @@ static void uhci_check_ports(struct uhci_hcd *uhci)
/* HP's server management chip requires
* a longer delay. */
if (uhci-wait_for_hp)
-wait_for_HP(uhci, port_addr);
+wait_for_HP(uhci, port_addr,
+USBPORTSC_CSC, 250);
/* If the port was enabled before, turning
* reset on caused a port enable change.
--
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Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
On 04/27/2013 12:51 AM, Alan Stern wrote: On Fri, 26 Apr 2013, ZhenHua wrote: There is a function wait_for_HP() in uhci-hub.c. In this patch, it is used in suspend_rh(), I think this can be a solution. And I have tested this patch, it can fix the bug. I think there is another patch needed. As Alan said in another mail, in the UHCI_RH_RUNNING_NODEVS case, it should not be stopped if the uhci device is HP iLo virtual usb. I believe that if you change the UHCI_RH_RUNNING_NODEVS case, you will find that this patch (calling wait_for_HP) isn't needed. In fact, the patch is so easy that I am including it below. Please test this (without either of your patches) to see if it works. Alan Stern Index: usb-3.9/drivers/usb/host/uhci-hub.c === --- usb-3.9.orig/drivers/usb/host/uhci-hub.c +++ usb-3.9/drivers/usb/host/uhci-hub.c @@ -225,7 +225,8 @@ static int uhci_hub_status_data(struct u /* auto-stop if nothing connected for 1 second */ if (any_ports_active(uhci)) uhci-rh_state = UHCI_RH_RUNNING; - else if (time_after_eq(jiffies, uhci-auto_stop_time)) + else if (time_after_eq(jiffies, uhci-auto_stop_time) + !uhci-wait_for_hp) suspend_rh(uhci, UHCI_RH_AUTO_STOPPED); break; I have tested the UHCI_RH_RUNNING_NODEVS case yeasterday, and it works. But the function suspend_rh is also called in other places, so I think it only fixes the warning when auto stop is called, but not fix the warning when uhci's bus_suspend is called, it will come out again. And if you add uhci-wait_for_hp check in the UHCI_RH_RUNNING_NODEVS case, all hp uhci devices will not auto stop, not only the virtual devices. I guess it may waste resource. Thanks Zhen-Hua -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
I send out this patch for the second time.
Changed try to int. And modified the comment.
On 04/25/2013 03:11 PM, Li, Zhen-Hua wrote:
This patch is trying to fix this bug on SLES11 SP2:
https://bugzilla.novell.com/show_bug.cgi?id=817035
On a large HP system with 64T memory and 60 logical cpus, when usb
driver inits the iLo Virtual USB Controller, there comes a warning
Controller not stopped yet!. It is because driver does not wait
enough time. So driver should wait and retry if found controller
not stopped.
Signed-off-by: Li, Zhen-Hua zhen-h...@hp.com
Signed-off-by: Tom Vaden tom.va...@hp.com
---
drivers/usb/host/uhci-hcd.c | 17 -
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 4a86b63..d592e22 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -277,6 +277,9 @@ static int global_suspend_mode_is_broken(struct uhci_hcd
*uhci)
uhci-global_suspend_mode_is_broken(uhci) : 0;
}
+#define UHCI_SUSPENDRH_RETRY_MAX 10
+#define UHCI_SUSPENDRH_RETRY_DELAY100
+
static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
__releases(uhci-lock)
__acquires(uhci-lock)
@@ -284,6 +287,8 @@ __acquires(uhci-lock)
int auto_stop;
int int_enable, egsm_enable, wakeup_enable;
struct usb_device *rhdev = uhci_to_hcd(uhci)-self.root_hub;
+ int try;
+ u16 stopped;
auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
dev_dbg(rhdev-dev, %s%s\n, __func__,
@@ -355,7 +360,17 @@ __acquires(uhci-lock)
if (uhci-dead)
return;
}
- if (!(uhci_readw(uhci, USBSTS) USBSTS_HCH))
+
+ for (try = 0; try UHCI_SUSPENDRH_RETRY_MAX; try++) {
+ /* For some devices, for example, HP iLo usb controller,
+* we need to wait for more time and retry.
+*/
+ stopped = uhci_readw(uhci, USBSTS) USBSTS_HCH;
+ if (stopped)
+ break;
+ udelay(UHCI_SUSPENDRH_RETRY_DELAY);
+ }
+ if (!stopped)
dev_warn(uhci_dev(uhci), Controller not stopped yet!\n);
uhci_get_current_frame_number(uhci);
--
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Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
On 04/25/2013 10:54 PM, Alan Stern wrote:
On Thu, 25 Apr 2013, ZhenHua wrote:
+#define UHCI_SUSPENDRH_RETRY_MAX 10
+#define UHCI_SUSPENDRH_RETRY_DELAY100
Why is the delay set to 100 us? Isn't that excessively large? How
long does it take for this controller to go into suspend?
This controller will take about 200~400 us, but I am not sure how long
other devices will take.
I set interval to 100 us, so it will save more time.
A 400-us delay is fairly long. It would be better to avoid it
The device needs about 200~400 us to get stopped, not OS.
For other devices, it will not wait.
entirely.
Why are these variables u16? Why not int?
uhci_readw will return u16.
That's not a good reason, since u16 fits perfectly well inside an
int. But never mind...
Anyway, a better approach would be not to add a delay loop at all.
Instead, change this test:
if (!auto_stop !(uhci_readw(uhci, USBSTS) USBSTS_HCH)) {
uhci-rh_state = UHCI_RH_SUSPENDING;
spin_unlock_irq(uhci-lock);
msleep(1);
spin_lock_irq(uhci-lock);
if (uhci-dead)
return;
}
When the iLo controller is present, make the if statement always
succeed. Then you'll get a whole 1-ms delay.
This will cause more operation and more time for other devices.
Actually what I wrote was wrong anyway. I forgot that when auto_stop
is set, the routine is not allowed to sleep.
A better way to solve your problem is to change uhci_hub_status_data().
In the UHCI_RH_RUNNING_NODEVS case, change the line that says
else if (time_after_eq(jiffies, uhci-auto_stop_time))
to
else if (time_after_eq(jiffies, uhci-auto_stop_time)
!uhci-no_auto_stops)
where uhci-no_auto_stops is a new bitflag that you set inside
uhci_pci_init() if you detect that the controller is an iLo virtual
UHCI controller.
This way there will always be a 1-ms delay, so the slow controller will
suspend successfully. And other types of host controllers won't be
affected, because the no_auto_stops flag won't get set for them.
Alan Stern
I think it is a good idea, and the logic of the code may be more
clear. I will do some test on my system.
Thanks
Zhen-Hua
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Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
On 04/23/2013 11:10 PM, Alan Stern wrote:
On Tue, 23 Apr 2013, Greg KH wrote:
On Tue, Apr 23, 2013 at 03:15:01PM +0800, Li, Zhen-Hua wrote:
From: Li, Zhen-Hua zhen-h...@hp.com
This patch is trying to fix bug QXCR1001261767.
What is that bug number? Where can it be referenced? If you are going
to put it in a public place (like a kernel changelog), it needs to be
publicly accessible.
On some HP platform, when usb driver inits the iLo Virtual USB Controller, there may be a
warning Controller not stopped yet!. It is because driver does not wait
enough time.
What happened to your line endings?
This patch adds more time waiting and retries.
Why not only do this for your device?
It won't hurt to do it for all devices, because the wait loop will
terminate as soon as the controller goes into suspend. For normal
controllers this will be on the first iteration.
Yes, most devices only need one time check.
Signed-off-by: Li, Zhen-Hua zhen-h...@hp.com
---
drivers/usb/host/uhci-hcd.c | 16 +++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 4a86b63..514e9d7 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -277,6 +277,9 @@ static int global_suspend_mode_is_broken(struct uhci_hcd
*uhci)
uhci-global_suspend_mode_is_broken(uhci) : 0;
}
+#define UHCI_SUSPENDRH_RETRY_MAX 10
+#define UHCI_SUSPENDRH_RETRY_DELAY100
Why is the delay set to 100 us? Isn't that excessively large? How
long does it take for this controller to go into suspend?
This controller will take about 200~400 us, but I am not sure how long
other devices will take.
I set interval to 100 us, so it will save more time.
static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
__releases(uhci-lock)
__acquires(uhci-lock)
@@ -284,6 +287,7 @@ __acquires(uhci-lock)
int auto_stop;
int int_enable, egsm_enable, wakeup_enable;
struct usb_device *rhdev = uhci_to_hcd(uhci)-self.root_hub;
+ u16 try, stopped;
Why are these variables u16? Why not int?
uhci_readw will return u16.
Anyway, a better approach would be not to add a delay loop at all.
Instead, change this test:
if (!auto_stop !(uhci_readw(uhci, USBSTS) USBSTS_HCH)) {
uhci-rh_state = UHCI_RH_SUSPENDING;
spin_unlock_irq(uhci-lock);
msleep(1);
spin_lock_irq(uhci-lock);
if (uhci-dead)
return;
}
When the iLo controller is present, make the if statement always
succeed. Then you'll get a whole 1-ms delay.
This will cause more operation and more time for other devices.
Alan Stern
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Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
On 04/23/2013 10:07 PM, Greg KH wrote:
On Tue, Apr 23, 2013 at 03:15:01PM +0800, Li, Zhen-Hua wrote:
From: Li, Zhen-Hua zhen-h...@hp.com
This patch is trying to fix bug QXCR1001261767.
Sorry for the bug number. Please ignore this line.
What is that bug number? Where can it be referenced? If you are going
to put it in a public place (like a kernel changelog), it needs to be
publicly accessible.
On some HP platform, when usb driver inits the iLo Virtual USB Controller, there may be a
warning Controller not stopped yet!. It is because driver does not wait
enough time.
What happened to your line endings?
This patch adds more time waiting and retries.
Why not only do this for your device?
Signed-off-by: Li, Zhen-Hua zhen-h...@hp.com
---
drivers/usb/host/uhci-hcd.c | 16 +++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 4a86b63..514e9d7 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -277,6 +277,9 @@ static int global_suspend_mode_is_broken(struct uhci_hcd
*uhci)
uhci-global_suspend_mode_is_broken(uhci) : 0;
}
+#define UHCI_SUSPENDRH_RETRY_MAX 10
+#define UHCI_SUSPENDRH_RETRY_DELAY100
+
static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
__releases(uhci-lock)
__acquires(uhci-lock)
@@ -284,6 +287,7 @@ __acquires(uhci-lock)
int auto_stop;
int int_enable, egsm_enable, wakeup_enable;
struct usb_device *rhdev = uhci_to_hcd(uhci)-self.root_hub;
+ u16 try, stopped;
auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
dev_dbg(rhdev-dev, %s%s\n, __func__,
@@ -355,7 +359,17 @@ __acquires(uhci-lock)
if (uhci-dead)
return;
}
- if (!(uhci_readw(uhci, USBSTS) USBSTS_HCH))
+
+ for (try = 0; try UHCI_SUSPENDRH_RETRY_MAX; try++) {
+ /*
+* Sometimes we may need to wait more time and try again.
+*/
Sometimes? Please be more specific. Also, a multi-line comment isn't
needed, make it one line please.
thanks,
greg k-h
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Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver
I did not found any url you can visit. And we will file a bug on SLES bugzilla site if possible. I paste the bug discription here: When booting SLES 11 SP2 on our server , messages like the following are logged during boot: [ 254.087187] uhci_hcd :07:00.4: Controller not stopped yet! Thanks Zhen-Hua On 04/24/2013 09:57 AM, Greg KH wrote: On Wed, Apr 24, 2013 at 07:55:18AM +0800, ZhenHua wrote: On 04/23/2013 10:07 PM, Greg KH wrote: On Tue, Apr 23, 2013 at 03:15:01PM +0800, Li, Zhen-Hua wrote: From: Li, Zhen-Hua zhen-h...@hp.com This patch is trying to fix bug QXCR1001261767. Sorry for the bug number. Please ignore this line. I don't want to ignore it, I want it to point to something that I, and others, can reference in the future. Is there a url you can use for it? thanks, greg k-h -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
