diff mbox series

[v6] xhci: re-initialize the HC during resume if HCE was set

Message ID 20220129093036.488231-1-pumahsu@google.com
State New
Headers show
Series [v6] xhci: re-initialize the HC during resume if HCE was set | expand

Commit Message

Puma Hsu Jan. 29, 2022, 9:30 a.m. UTC 
When HCE(Host Controller Error) is set, it means an internal
error condition has been detected. Software needs to re-initialize
the HC, so add this check in xhci resume.

Cc: stable@vger.kernel.org
Signed-off-by: Puma Hsu <pumahsu@google.com>
---
v2: Follow Sergey Shtylyov <s.shtylyov@omp.ru>'s comment.
v3: Add stable@vger.kernel.org for stable release.
v4: Refine the commit message.
v5: Add a debug log. Follow Mathias Nyman <mathias.nyman@linux.intel.com>'s comment.
v6: Fix the missing declaration for str.

 drivers/usb/host/xhci.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Comments

Mathias Nyman Feb. 2, 2022, 7:12 p.m. UTC | #1 
On 29.1.2022 11.30, Puma Hsu wrote:
> When HCE(Host Controller Error) is set, it means an internal
> error condition has been detected. Software needs to re-initialize
> the HC, so add this check in xhci resume.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Puma Hsu <pumahsu@google.com>
> ---
> v2: Follow Sergey Shtylyov <s.shtylyov@omp.ru>'s comment.
> v3: Add stable@vger.kernel.org for stable release.
> v4: Refine the commit message.
> v5: Add a debug log. Follow Mathias Nyman <mathias.nyman@linux.intel.com>'s comment.
> v6: Fix the missing declaration for str.
> 
>  drivers/usb/host/xhci.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index dc357cabb265..6f1198068004 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -1091,6 +1091,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
>  	int			retval = 0;
>  	bool			comp_timer_running = false;
>  	bool			pending_portevent = false;
> +	char			str[XHCI_MSG_MAX];
>  
>  	if (!hcd->state)
>  		return 0;
> @@ -1146,8 +1147,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
>  		temp = readl(&xhci->op_regs->status);
>  	}
>  
> -	/* If restore operation fails, re-initialize the HC during resume */
> -	if ((temp & STS_SRE) || hibernated) {
> +	/* If restore operation fails or HC error is detected, re-initialize the HC during resume */
> +	if ((temp & (STS_SRE | STS_HCE)) || hibernated) {
> +		xhci_warn(xhci, "re-initialize HC during resume, USBSTS:%s\n",
> +			  xhci_decode_usbsts(str, temp));
>  
>  		if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
>  				!(xhci_all_ports_seen_u0(xhci))) {
> 

Ended up modifying this patch a bit more than I first intended,
- don't print warning in hibernation case, only error.
- maybe using a lot of stack for a debug string isn't really needed.
- make sure we read the usbsts register before checking for the HCE bit.

Does the below work for you? If yes, and you agree I'll apply it instead

---

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dc357cabb265..04ec2de158bf 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1091,6 +1091,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
        int                     retval = 0;
        bool                    comp_timer_running = false;
        bool                    pending_portevent = false;
+       bool                    reinit_xhc = false;
 
        if (!hcd->state)
                return 0;
@@ -1107,10 +1108,11 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
        set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
 
        spin_lock_irq(&xhci->lock);
-       if ((xhci->quirks & XHCI_RESET_ON_RESUME) || xhci->broken_suspend)
-               hibernated = true;
 
-       if (!hibernated) {
+       if (hibernated || xhci->quirks & XHCI_RESET_ON_RESUME || xhci->broken_suspend)
+               reinit_xhc = true;
+
+       if (!reinit_xhc) {
                /*
                 * Some controllers might lose power during suspend, so wait
                 * for controller not ready bit to clear, just as in xHC init.
@@ -1143,12 +1145,17 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
                        spin_unlock_irq(&xhci->lock);
                        return -ETIMEDOUT;
                }
-               temp = readl(&xhci->op_regs->status);
        }
 
-       /* If restore operation fails, re-initialize the HC during resume */
-       if ((temp & STS_SRE) || hibernated) {
+       temp = readl(&xhci->op_regs->status);
+
+       /* re-initialize the HC on Restore Error, or Host Controller Error */
+       if (temp & (STS_SRE | STS_HCE)) {
+               reinit_xhc = true;
+               xhci_warn(xhci, "xHC error in resume, USBSTS 0x%x, Reinit\n", temp);
+       }
 
+       if (reinit_xhc) {
                if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
                                !(xhci_all_ports_seen_u0(xhci))) {
                        del_timer_sync(&xhci->comp_mode_recovery_timer);
Puma Hsu Feb. 15, 2022, 12:05 p.m. UTC | #2 
On Thu, Feb 10, 2022 at 7:08 PM Mathias Nyman
<mathias.nyman@linux.intel.com> wrote:
>
> On 8.2.2022 9.11, Puma Hsu wrote:
> > On Thu, Feb 3, 2022 at 3:11 AM Mathias Nyman
> > <mathias.nyman@linux.intel.com> wrote:
> >>
> >> On 29.1.2022 11.30, Puma Hsu wrote:
> >>> When HCE(Host Controller Error) is set, it means an internal
> >>> error condition has been detected. Software needs to re-initialize
> >>> the HC, so add this check in xhci resume.
> >>>
> >>> Cc: stable@vger.kernel.org
> >>> Signed-off-by: Puma Hsu <pumahsu@google.com>
> >>> ---
> >>> v2: Follow Sergey Shtylyov <s.shtylyov@omp.ru>'s comment.
> >>> v3: Add stable@vger.kernel.org for stable release.
> >>> v4: Refine the commit message.
> >>> v5: Add a debug log. Follow Mathias Nyman <mathias.nyman@linux.intel.com>'s comment.
> >>> v6: Fix the missing declaration for str.
> >>>
> >>>  drivers/usb/host/xhci.c | 7 +++++--
> >>>  1 file changed, 5 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> >>> index dc357cabb265..6f1198068004 100644
> >>> --- a/drivers/usb/host/xhci.c
> >>> +++ b/drivers/usb/host/xhci.c
> >>> @@ -1091,6 +1091,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
> >>>       int                     retval = 0;
> >>>       bool                    comp_timer_running = false;
> >>>       bool                    pending_portevent = false;
> >>> +     char                    str[XHCI_MSG_MAX];
> >>>
> >>>       if (!hcd->state)
> >>>               return 0;
> >>> @@ -1146,8 +1147,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
> >>>               temp = readl(&xhci->op_regs->status);
> >>>       }
> >>>
> >>> -     /* If restore operation fails, re-initialize the HC during resume */
> >>> -     if ((temp & STS_SRE) || hibernated) {
> >>> +     /* If restore operation fails or HC error is detected, re-initialize the HC during resume */
> >>> +     if ((temp & (STS_SRE | STS_HCE)) || hibernated) {
> >>> +             xhci_warn(xhci, "re-initialize HC during resume, USBSTS:%s\n",
> >>> +                       xhci_decode_usbsts(str, temp));
> >>>
> >>>               if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
> >>>                               !(xhci_all_ports_seen_u0(xhci))) {
> >>>
> >>
> >> Ended up modifying this patch a bit more than I first intended,
> >> - don't print warning in hibernation case, only error.
> >> - maybe using a lot of stack for a debug string isn't really needed.
> >> - make sure we read the usbsts register before checking for the HCE bit.
> >>
> >> Does the below work for you? If yes, and you agree I'll apply it instead
> >
> > Hi Mathias,
> > Yes, your patch works for me, thanks!
> > Will you submit a new patch? or should I update to a new version?
> > Thanks.
>
> I'll submit it

Hi Mathias,
Could I know when you will submit the new patch?
We will sync the patch to our project.
Thank you for your effort!

>
> Thanks
> -Mathias
Mathias Nyman Feb. 15, 2022, 12:35 p.m. UTC | #3 
On 15.2.2022 14.05, Puma Hsu wrote:
> On Thu, Feb 10, 2022 at 7:08 PM Mathias Nyman
> <mathias.nyman@linux.intel.com> wrote:
>>
>> On 8.2.2022 9.11, Puma Hsu wrote:
>>> On Thu, Feb 3, 2022 at 3:11 AM Mathias Nyman
>>> <mathias.nyman@linux.intel.com> wrote:
>>>>
>>>> On 29.1.2022 11.30, Puma Hsu wrote:
>>>>> When HCE(Host Controller Error) is set, it means an internal
>>>>> error condition has been detected. Software needs to re-initialize
>>>>> the HC, so add this check in xhci resume.
>>>>>
>>>>> Cc: stable@vger.kernel.org
>>>>> Signed-off-by: Puma Hsu <pumahsu@google.com>
>>>>> ---
>>>>> v2: Follow Sergey Shtylyov <s.shtylyov@omp.ru>'s comment.
>>>>> v3: Add stable@vger.kernel.org for stable release.
>>>>> v4: Refine the commit message.
>>>>> v5: Add a debug log. Follow Mathias Nyman <mathias.nyman@linux.intel.com>'s comment.
>>>>> v6: Fix the missing declaration for str.
>>>>>
>>>>>  drivers/usb/host/xhci.c | 7 +++++--
>>>>>  1 file changed, 5 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
>>>>> index dc357cabb265..6f1198068004 100644
>>>>> --- a/drivers/usb/host/xhci.c
>>>>> +++ b/drivers/usb/host/xhci.c
>>>>> @@ -1091,6 +1091,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
>>>>>       int                     retval = 0;
>>>>>       bool                    comp_timer_running = false;
>>>>>       bool                    pending_portevent = false;
>>>>> +     char                    str[XHCI_MSG_MAX];
>>>>>
>>>>>       if (!hcd->state)
>>>>>               return 0;
>>>>> @@ -1146,8 +1147,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
>>>>>               temp = readl(&xhci->op_regs->status);
>>>>>       }
>>>>>
>>>>> -     /* If restore operation fails, re-initialize the HC during resume */
>>>>> -     if ((temp & STS_SRE) || hibernated) {
>>>>> +     /* If restore operation fails or HC error is detected, re-initialize the HC during resume */
>>>>> +     if ((temp & (STS_SRE | STS_HCE)) || hibernated) {
>>>>> +             xhci_warn(xhci, "re-initialize HC during resume, USBSTS:%s\n",
>>>>> +                       xhci_decode_usbsts(str, temp));
>>>>>
>>>>>               if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
>>>>>                               !(xhci_all_ports_seen_u0(xhci))) {
>>>>>
>>>>
>>>> Ended up modifying this patch a bit more than I first intended,
>>>> - don't print warning in hibernation case, only error.
>>>> - maybe using a lot of stack for a debug string isn't really needed.
>>>> - make sure we read the usbsts register before checking for the HCE bit.
>>>>
>>>> Does the below work for you? If yes, and you agree I'll apply it instead
>>>
>>> Hi Mathias,
>>> Yes, your patch works for me, thanks!
>>> Will you submit a new patch? or should I update to a new version?
>>> Thanks.
>>
>> I'll submit it
> 
> Hi Mathias,
> Could I know when you will submit the new patch?
> We will sync the patch to our project.
> Thank you for your effort!

Just did, thanks for the reminder.

-Mathias
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dc357cabb265..6f1198068004 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1091,6 +1091,7 @@  int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 	int			retval = 0;
 	bool			comp_timer_running = false;
 	bool			pending_portevent = false;
+	char			str[XHCI_MSG_MAX];
 
 	if (!hcd->state)
 		return 0;
@@ -1146,8 +1147,10 @@  int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 		temp = readl(&xhci->op_regs->status);
 	}
 
-	/* If restore operation fails, re-initialize the HC during resume */
-	if ((temp & STS_SRE) || hibernated) {
+	/* If restore operation fails or HC error is detected, re-initialize the HC during resume */
+	if ((temp & (STS_SRE | STS_HCE)) || hibernated) {
+		xhci_warn(xhci, "re-initialize HC during resume, USBSTS:%s\n",
+			  xhci_decode_usbsts(str, temp));
 
 		if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 				!(xhci_all_ports_seen_u0(xhci))) {