* [PATCH] usb: dwc3: gadget: Fix broken gadget on system suspend/resume
@ 2014-11-12 14:58 Roger Quadros
[not found] ` <1415804296-28980-1-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
0 siblings, 1 reply; 6+ messages in thread
From: Roger Quadros @ 2014-11-12 14:58 UTC (permalink / raw)
To: balbi; +Cc: linux-usb, linux-omap, linux-kernel, Roger Quadros
On TI SoCs (e.g. DRA7) we don't support the DWC3 hibernation feature.
We need to stop the gadget controller while system suspend
else it results in L3 Bus errors on resume with broken
USB gadget on J6-evm.
[ 55.718226] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x224/0x31c()
[ 55.718232] 44000000.ocp:L3 Custom Error: MASTER USB3 TARGET GPMC (Idle): Data Access in User mode during Functional access
[ 55.718263] Modules linked in: usb_f_ss_lb g_zero libcomposite configfs xhci_hcd btwilink bluetooth dwc3 6lowpan_iphc m25p80 dwc3_omap omap_remoteproc
[ 55.718271] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.19-02011-g3ece3ca-dirty #658
[ 55.718290] [<c0016090>] (unwind_backtrace) from [<c0012060>] (show_stack+0x10/0x14)
[ 55.718302] [<c0012060>] (show_stack) from [<c062a2e4>] (dump_stack+0x78/0x94)
[ 55.718315] [<c062a2e4>] (dump_stack) from [<c0043bc4>] (warn_slowpath_common+0x6c/0x90)
[ 55.718325] [<c0043bc4>] (warn_slowpath_common) from [<c0043c7c>] (warn_slowpath_fmt+0x30/0x40)
[ 55.718336] [<c0043c7c>] (warn_slowpath_fmt) from [<c030fb24>] (l3_interrupt_handler+0x224/0x31c)
[ 55.718348] [<c030fb24>] (l3_interrupt_handler) from [<c0093010>] (handle_irq_event_percpu+0x5c/0x23c)
[ 55.718358] [<c0093010>] (handle_irq_event_percpu) from [<c009322c>] (handle_irq_event+0x3c/0x5c)
[ 55.718367] [<c009322c>] (handle_irq_event) from [<c0096160>] (handle_fasteoi_irq+0x98/0x158)
[ 55.718377] [<c0096160>] (handle_fasteoi_irq) from [<c00929dc>] (generic_handle_irq+0x20/0x30)
[ 55.718385] [<c00929dc>] (generic_handle_irq) from [<c000eea8>] (handle_IRQ+0x4c/0xb0)
[ 55.718393] [<c000eea8>] (handle_IRQ) from [<c0008638>] (gic_handle_irq+0x28/0x5c)
[ 55.718402] [<c0008638>] (gic_handle_irq) from [<c0630964>] (__irq_svc+0x44/0x5c)
[ 55.718406] Exception stack(0xc09c1f68 to 0xc09c1fb0)
[ 55.718412] 1f60: 00000001 00000001 00000000 00000000 c09c0000 00000000
[ 55.718418] 1f80: c09c0000 c09c0000 c0a7a1e4 c09c8938 c09c89b4 00000000 60000093 c09c1fb0
[ 55.718423] 1fa0: c008a2e4 c00926cc 60000013 ffffffff
[ 55.718433] [<c0630964>] (__irq_svc) from [<c00926cc>] (cpu_startup_entry+0x100/0x1f4)
[ 55.718444] [<c00926cc>] (cpu_startup_entry) from [<c0901ac4>] (start_kernel+0x324/0x388)
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
drivers/usb/dwc3/gadget.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 3818b26..bc15b54 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2741,7 +2741,13 @@ int dwc3_gadget_prepare(struct dwc3 *dwc)
{
if (dwc->pullups_connected) {
dwc3_gadget_disable_irq(dwc);
- dwc3_gadget_run_stop(dwc, true, true);
+ if (dwc->has_hibernation) {
+ dwc3_gadget_run_stop(dwc, true, true);
+ } else {
+ dwc3_gadget_run_stop(dwc, false, true);
+ /* remember to connect back on resume */
+ dwc->pullups_connected = true;
+ }
}
return 0;
--
1.8.3.2
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] usb: dwc3: gadget: Fix broken gadget on system suspend/resume
[not found] ` <1415804296-28980-1-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
@ 2014-11-12 15:08 ` Felipe Balbi
2014-11-12 15:32 ` Roger Quadros
0 siblings, 1 reply; 6+ messages in thread
From: Felipe Balbi @ 2014-11-12 15:08 UTC (permalink / raw)
To: Roger Quadros
Cc: balbi-l0cyMroinI0, linux-usb-u79uwXL29TY76Z2rM5mHXA,
linux-omap-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA
[-- Attachment #1: Type: text/plain, Size: 3744 bytes --]
On Wed, Nov 12, 2014 at 04:58:16PM +0200, Roger Quadros wrote:
> On TI SoCs (e.g. DRA7) we don't support the DWC3 hibernation feature.
> We need to stop the gadget controller while system suspend
> else it results in L3 Bus errors on resume with broken
> USB gadget on J6-evm.
>
> [ 55.718226] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x224/0x31c()
> [ 55.718232] 44000000.ocp:L3 Custom Error: MASTER USB3 TARGET GPMC (Idle): Data Access in User mode during Functional access
> [ 55.718263] Modules linked in: usb_f_ss_lb g_zero libcomposite configfs xhci_hcd btwilink bluetooth dwc3 6lowpan_iphc m25p80 dwc3_omap omap_remoteproc
> [ 55.718271] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.19-02011-g3ece3ca-dirty #658
> [ 55.718290] [<c0016090>] (unwind_backtrace) from [<c0012060>] (show_stack+0x10/0x14)
> [ 55.718302] [<c0012060>] (show_stack) from [<c062a2e4>] (dump_stack+0x78/0x94)
> [ 55.718315] [<c062a2e4>] (dump_stack) from [<c0043bc4>] (warn_slowpath_common+0x6c/0x90)
> [ 55.718325] [<c0043bc4>] (warn_slowpath_common) from [<c0043c7c>] (warn_slowpath_fmt+0x30/0x40)
> [ 55.718336] [<c0043c7c>] (warn_slowpath_fmt) from [<c030fb24>] (l3_interrupt_handler+0x224/0x31c)
> [ 55.718348] [<c030fb24>] (l3_interrupt_handler) from [<c0093010>] (handle_irq_event_percpu+0x5c/0x23c)
> [ 55.718358] [<c0093010>] (handle_irq_event_percpu) from [<c009322c>] (handle_irq_event+0x3c/0x5c)
> [ 55.718367] [<c009322c>] (handle_irq_event) from [<c0096160>] (handle_fasteoi_irq+0x98/0x158)
> [ 55.718377] [<c0096160>] (handle_fasteoi_irq) from [<c00929dc>] (generic_handle_irq+0x20/0x30)
> [ 55.718385] [<c00929dc>] (generic_handle_irq) from [<c000eea8>] (handle_IRQ+0x4c/0xb0)
> [ 55.718393] [<c000eea8>] (handle_IRQ) from [<c0008638>] (gic_handle_irq+0x28/0x5c)
> [ 55.718402] [<c0008638>] (gic_handle_irq) from [<c0630964>] (__irq_svc+0x44/0x5c)
> [ 55.718406] Exception stack(0xc09c1f68 to 0xc09c1fb0)
> [ 55.718412] 1f60: 00000001 00000001 00000000 00000000 c09c0000 00000000
> [ 55.718418] 1f80: c09c0000 c09c0000 c0a7a1e4 c09c8938 c09c89b4 00000000 60000093 c09c1fb0
> [ 55.718423] 1fa0: c008a2e4 c00926cc 60000013 ffffffff
> [ 55.718433] [<c0630964>] (__irq_svc) from [<c00926cc>] (cpu_startup_entry+0x100/0x1f4)
> [ 55.718444] [<c00926cc>] (cpu_startup_entry) from [<c0901ac4>] (start_kernel+0x324/0x388)
>
> Signed-off-by: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
> ---
> drivers/usb/dwc3/gadget.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 3818b26..bc15b54 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2741,7 +2741,13 @@ int dwc3_gadget_prepare(struct dwc3 *dwc)
there is no more dwc3_gadget_prepare(), please rebase on 'next'.
> {
> if (dwc->pullups_connected) {
> dwc3_gadget_disable_irq(dwc);
> - dwc3_gadget_run_stop(dwc, true, true);
> + if (dwc->has_hibernation) {
> + dwc3_gadget_run_stop(dwc, true, true);
> + } else {
> + dwc3_gadget_run_stop(dwc, false, true);
> + /* remember to connect back on resume */
> + dwc->pullups_connected = true;
> + }
Another thing you probably want to do is make sure there is nothing
pending on our request list because if there is, then we need to wait
for any in-flight transfers to complete before disconnecting.
I also wonder if current code isn't really fragile... I mean, when you
clear run_stop bit, you should notify the gadget by means of
->disconnect() and so on... But since we can't test this with mainline,
then it's difficult to tell.
--
balbi
[-- Attachment #2: Digital signature --]
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] usb: dwc3: gadget: Fix broken gadget on system suspend/resume
2014-11-12 15:08 ` Felipe Balbi
@ 2014-11-12 15:32 ` Roger Quadros
2014-11-12 15:36 ` Felipe Balbi
0 siblings, 1 reply; 6+ messages in thread
From: Roger Quadros @ 2014-11-12 15:32 UTC (permalink / raw)
To: balbi; +Cc: linux-usb, linux-omap, linux-kernel
On 11/12/2014 05:08 PM, Felipe Balbi wrote:
> On Wed, Nov 12, 2014 at 04:58:16PM +0200, Roger Quadros wrote:
>> On TI SoCs (e.g. DRA7) we don't support the DWC3 hibernation feature.
>> We need to stop the gadget controller while system suspend
>> else it results in L3 Bus errors on resume with broken
>> USB gadget on J6-evm.
>>
>> [ 55.718226] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x224/0x31c()
>> [ 55.718232] 44000000.ocp:L3 Custom Error: MASTER USB3 TARGET GPMC (Idle): Data Access in User mode during Functional access
>> [ 55.718263] Modules linked in: usb_f_ss_lb g_zero libcomposite configfs xhci_hcd btwilink bluetooth dwc3 6lowpan_iphc m25p80 dwc3_omap omap_remoteproc
>> [ 55.718271] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.19-02011-g3ece3ca-dirty #658
>> [ 55.718290] [<c0016090>] (unwind_backtrace) from [<c0012060>] (show_stack+0x10/0x14)
>> [ 55.718302] [<c0012060>] (show_stack) from [<c062a2e4>] (dump_stack+0x78/0x94)
>> [ 55.718315] [<c062a2e4>] (dump_stack) from [<c0043bc4>] (warn_slowpath_common+0x6c/0x90)
>> [ 55.718325] [<c0043bc4>] (warn_slowpath_common) from [<c0043c7c>] (warn_slowpath_fmt+0x30/0x40)
>> [ 55.718336] [<c0043c7c>] (warn_slowpath_fmt) from [<c030fb24>] (l3_interrupt_handler+0x224/0x31c)
>> [ 55.718348] [<c030fb24>] (l3_interrupt_handler) from [<c0093010>] (handle_irq_event_percpu+0x5c/0x23c)
>> [ 55.718358] [<c0093010>] (handle_irq_event_percpu) from [<c009322c>] (handle_irq_event+0x3c/0x5c)
>> [ 55.718367] [<c009322c>] (handle_irq_event) from [<c0096160>] (handle_fasteoi_irq+0x98/0x158)
>> [ 55.718377] [<c0096160>] (handle_fasteoi_irq) from [<c00929dc>] (generic_handle_irq+0x20/0x30)
>> [ 55.718385] [<c00929dc>] (generic_handle_irq) from [<c000eea8>] (handle_IRQ+0x4c/0xb0)
>> [ 55.718393] [<c000eea8>] (handle_IRQ) from [<c0008638>] (gic_handle_irq+0x28/0x5c)
>> [ 55.718402] [<c0008638>] (gic_handle_irq) from [<c0630964>] (__irq_svc+0x44/0x5c)
>> [ 55.718406] Exception stack(0xc09c1f68 to 0xc09c1fb0)
>> [ 55.718412] 1f60: 00000001 00000001 00000000 00000000 c09c0000 00000000
>> [ 55.718418] 1f80: c09c0000 c09c0000 c0a7a1e4 c09c8938 c09c89b4 00000000 60000093 c09c1fb0
>> [ 55.718423] 1fa0: c008a2e4 c00926cc 60000013 ffffffff
>> [ 55.718433] [<c0630964>] (__irq_svc) from [<c00926cc>] (cpu_startup_entry+0x100/0x1f4)
>> [ 55.718444] [<c00926cc>] (cpu_startup_entry) from [<c0901ac4>] (start_kernel+0x324/0x388)
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> ---
>> drivers/usb/dwc3/gadget.c | 8 +++++++-
>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>> index 3818b26..bc15b54 100644
>> --- a/drivers/usb/dwc3/gadget.c
>> +++ b/drivers/usb/dwc3/gadget.c
>> @@ -2741,7 +2741,13 @@ int dwc3_gadget_prepare(struct dwc3 *dwc)
>
> there is no more dwc3_gadget_prepare(), please rebase on 'next'.
right.
>
>> {
>> if (dwc->pullups_connected) {
>> dwc3_gadget_disable_irq(dwc);
>> - dwc3_gadget_run_stop(dwc, true, true);
>> + if (dwc->has_hibernation) {
>> + dwc3_gadget_run_stop(dwc, true, true);
>> + } else {
>> + dwc3_gadget_run_stop(dwc, false, true);
>> + /* remember to connect back on resume */
>> + dwc->pullups_connected = true;
>> + }
>
> Another thing you probably want to do is make sure there is nothing
> pending on our request list because if there is, then we need to wait
> for any in-flight transfers to complete before disconnecting.
shouldn't that check be done in dwc3_gadget_run_stop()?
>
> I also wonder if current code isn't really fragile... I mean, when you
> clear run_stop bit, you should notify the gadget by means of
> ->disconnect() and so on... But since we can't test this with mainline,
> then it's difficult to tell.
>
that is true.
cheers,
-roger
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] usb: dwc3: gadget: Fix broken gadget on system suspend/resume
2014-11-12 15:32 ` Roger Quadros
@ 2014-11-12 15:36 ` Felipe Balbi
2014-11-12 15:40 ` Roger Quadros
0 siblings, 1 reply; 6+ messages in thread
From: Felipe Balbi @ 2014-11-12 15:36 UTC (permalink / raw)
To: Roger Quadros; +Cc: balbi, linux-usb, linux-omap, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 4425 bytes --]
Hi,
On Wed, Nov 12, 2014 at 05:32:00PM +0200, Roger Quadros wrote:
> On 11/12/2014 05:08 PM, Felipe Balbi wrote:
> > On Wed, Nov 12, 2014 at 04:58:16PM +0200, Roger Quadros wrote:
> >> On TI SoCs (e.g. DRA7) we don't support the DWC3 hibernation feature.
> >> We need to stop the gadget controller while system suspend
> >> else it results in L3 Bus errors on resume with broken
> >> USB gadget on J6-evm.
> >>
> >> [ 55.718226] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x224/0x31c()
> >> [ 55.718232] 44000000.ocp:L3 Custom Error: MASTER USB3 TARGET GPMC (Idle): Data Access in User mode during Functional access
> >> [ 55.718263] Modules linked in: usb_f_ss_lb g_zero libcomposite configfs xhci_hcd btwilink bluetooth dwc3 6lowpan_iphc m25p80 dwc3_omap omap_remoteproc
> >> [ 55.718271] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.19-02011-g3ece3ca-dirty #658
> >> [ 55.718290] [<c0016090>] (unwind_backtrace) from [<c0012060>] (show_stack+0x10/0x14)
> >> [ 55.718302] [<c0012060>] (show_stack) from [<c062a2e4>] (dump_stack+0x78/0x94)
> >> [ 55.718315] [<c062a2e4>] (dump_stack) from [<c0043bc4>] (warn_slowpath_common+0x6c/0x90)
> >> [ 55.718325] [<c0043bc4>] (warn_slowpath_common) from [<c0043c7c>] (warn_slowpath_fmt+0x30/0x40)
> >> [ 55.718336] [<c0043c7c>] (warn_slowpath_fmt) from [<c030fb24>] (l3_interrupt_handler+0x224/0x31c)
> >> [ 55.718348] [<c030fb24>] (l3_interrupt_handler) from [<c0093010>] (handle_irq_event_percpu+0x5c/0x23c)
> >> [ 55.718358] [<c0093010>] (handle_irq_event_percpu) from [<c009322c>] (handle_irq_event+0x3c/0x5c)
> >> [ 55.718367] [<c009322c>] (handle_irq_event) from [<c0096160>] (handle_fasteoi_irq+0x98/0x158)
> >> [ 55.718377] [<c0096160>] (handle_fasteoi_irq) from [<c00929dc>] (generic_handle_irq+0x20/0x30)
> >> [ 55.718385] [<c00929dc>] (generic_handle_irq) from [<c000eea8>] (handle_IRQ+0x4c/0xb0)
> >> [ 55.718393] [<c000eea8>] (handle_IRQ) from [<c0008638>] (gic_handle_irq+0x28/0x5c)
> >> [ 55.718402] [<c0008638>] (gic_handle_irq) from [<c0630964>] (__irq_svc+0x44/0x5c)
> >> [ 55.718406] Exception stack(0xc09c1f68 to 0xc09c1fb0)
> >> [ 55.718412] 1f60: 00000001 00000001 00000000 00000000 c09c0000 00000000
> >> [ 55.718418] 1f80: c09c0000 c09c0000 c0a7a1e4 c09c8938 c09c89b4 00000000 60000093 c09c1fb0
> >> [ 55.718423] 1fa0: c008a2e4 c00926cc 60000013 ffffffff
> >> [ 55.718433] [<c0630964>] (__irq_svc) from [<c00926cc>] (cpu_startup_entry+0x100/0x1f4)
> >> [ 55.718444] [<c00926cc>] (cpu_startup_entry) from [<c0901ac4>] (start_kernel+0x324/0x388)
> >>
> >> Signed-off-by: Roger Quadros <rogerq@ti.com>
> >> ---
> >> drivers/usb/dwc3/gadget.c | 8 +++++++-
> >> 1 file changed, 7 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> >> index 3818b26..bc15b54 100644
> >> --- a/drivers/usb/dwc3/gadget.c
> >> +++ b/drivers/usb/dwc3/gadget.c
> >> @@ -2741,7 +2741,13 @@ int dwc3_gadget_prepare(struct dwc3 *dwc)
> >
> > there is no more dwc3_gadget_prepare(), please rebase on 'next'.
>
> right.
>
> >
> >> {
> >> if (dwc->pullups_connected) {
> >> dwc3_gadget_disable_irq(dwc);
> >> - dwc3_gadget_run_stop(dwc, true, true);
> >> + if (dwc->has_hibernation) {
> >> + dwc3_gadget_run_stop(dwc, true, true);
> >> + } else {
> >> + dwc3_gadget_run_stop(dwc, false, true);
> >> + /* remember to connect back on resume */
> >> + dwc->pullups_connected = true;
> >> + }
> >
> > Another thing you probably want to do is make sure there is nothing
> > pending on our request list because if there is, then we need to wait
> > for any in-flight transfers to complete before disconnecting.
>
> shouldn't that check be done in dwc3_gadget_run_stop()?
no, gadget drivers only disconnect pullups when they know there's
nothing pending. And sometimes, we actually want to break such transfers
to see how the thing would behave. Only suspend/resume needs to make
transfers complete before hand.
> > I also wonder if current code isn't really fragile... I mean, when you
> > clear run_stop bit, you should notify the gadget by means of
> > ->disconnect() and so on... But since we can't test this with mainline,
> > then it's difficult to tell.
> >
> that is true.
Not sure what to do with this patch :-p
--
balbi
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] usb: dwc3: gadget: Fix broken gadget on system suspend/resume
2014-11-12 15:36 ` Felipe Balbi
@ 2014-11-12 15:40 ` Roger Quadros
2014-11-12 15:54 ` Felipe Balbi
0 siblings, 1 reply; 6+ messages in thread
From: Roger Quadros @ 2014-11-12 15:40 UTC (permalink / raw)
To: balbi; +Cc: linux-usb, linux-omap, linux-kernel
On 11/12/2014 05:36 PM, Felipe Balbi wrote:
> Hi,
>
> On Wed, Nov 12, 2014 at 05:32:00PM +0200, Roger Quadros wrote:
>> On 11/12/2014 05:08 PM, Felipe Balbi wrote:
>>> On Wed, Nov 12, 2014 at 04:58:16PM +0200, Roger Quadros wrote:
>>>> On TI SoCs (e.g. DRA7) we don't support the DWC3 hibernation feature.
>>>> We need to stop the gadget controller while system suspend
>>>> else it results in L3 Bus errors on resume with broken
>>>> USB gadget on J6-evm.
>>>>
>>>> [ 55.718226] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x224/0x31c()
>>>> [ 55.718232] 44000000.ocp:L3 Custom Error: MASTER USB3 TARGET GPMC (Idle): Data Access in User mode during Functional access
>>>> [ 55.718263] Modules linked in: usb_f_ss_lb g_zero libcomposite configfs xhci_hcd btwilink bluetooth dwc3 6lowpan_iphc m25p80 dwc3_omap omap_remoteproc
>>>> [ 55.718271] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.19-02011-g3ece3ca-dirty #658
>>>> [ 55.718290] [<c0016090>] (unwind_backtrace) from [<c0012060>] (show_stack+0x10/0x14)
>>>> [ 55.718302] [<c0012060>] (show_stack) from [<c062a2e4>] (dump_stack+0x78/0x94)
>>>> [ 55.718315] [<c062a2e4>] (dump_stack) from [<c0043bc4>] (warn_slowpath_common+0x6c/0x90)
>>>> [ 55.718325] [<c0043bc4>] (warn_slowpath_common) from [<c0043c7c>] (warn_slowpath_fmt+0x30/0x40)
>>>> [ 55.718336] [<c0043c7c>] (warn_slowpath_fmt) from [<c030fb24>] (l3_interrupt_handler+0x224/0x31c)
>>>> [ 55.718348] [<c030fb24>] (l3_interrupt_handler) from [<c0093010>] (handle_irq_event_percpu+0x5c/0x23c)
>>>> [ 55.718358] [<c0093010>] (handle_irq_event_percpu) from [<c009322c>] (handle_irq_event+0x3c/0x5c)
>>>> [ 55.718367] [<c009322c>] (handle_irq_event) from [<c0096160>] (handle_fasteoi_irq+0x98/0x158)
>>>> [ 55.718377] [<c0096160>] (handle_fasteoi_irq) from [<c00929dc>] (generic_handle_irq+0x20/0x30)
>>>> [ 55.718385] [<c00929dc>] (generic_handle_irq) from [<c000eea8>] (handle_IRQ+0x4c/0xb0)
>>>> [ 55.718393] [<c000eea8>] (handle_IRQ) from [<c0008638>] (gic_handle_irq+0x28/0x5c)
>>>> [ 55.718402] [<c0008638>] (gic_handle_irq) from [<c0630964>] (__irq_svc+0x44/0x5c)
>>>> [ 55.718406] Exception stack(0xc09c1f68 to 0xc09c1fb0)
>>>> [ 55.718412] 1f60: 00000001 00000001 00000000 00000000 c09c0000 00000000
>>>> [ 55.718418] 1f80: c09c0000 c09c0000 c0a7a1e4 c09c8938 c09c89b4 00000000 60000093 c09c1fb0
>>>> [ 55.718423] 1fa0: c008a2e4 c00926cc 60000013 ffffffff
>>>> [ 55.718433] [<c0630964>] (__irq_svc) from [<c00926cc>] (cpu_startup_entry+0x100/0x1f4)
>>>> [ 55.718444] [<c00926cc>] (cpu_startup_entry) from [<c0901ac4>] (start_kernel+0x324/0x388)
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>>> ---
>>>> drivers/usb/dwc3/gadget.c | 8 +++++++-
>>>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>>>> index 3818b26..bc15b54 100644
>>>> --- a/drivers/usb/dwc3/gadget.c
>>>> +++ b/drivers/usb/dwc3/gadget.c
>>>> @@ -2741,7 +2741,13 @@ int dwc3_gadget_prepare(struct dwc3 *dwc)
>>>
>>> there is no more dwc3_gadget_prepare(), please rebase on 'next'.
>>
>> right.
>>
>>>
>>>> {
>>>> if (dwc->pullups_connected) {
>>>> dwc3_gadget_disable_irq(dwc);
>>>> - dwc3_gadget_run_stop(dwc, true, true);
>>>> + if (dwc->has_hibernation) {
>>>> + dwc3_gadget_run_stop(dwc, true, true);
>>>> + } else {
>>>> + dwc3_gadget_run_stop(dwc, false, true);
>>>> + /* remember to connect back on resume */
>>>> + dwc->pullups_connected = true;
>>>> + }
>>>
>>> Another thing you probably want to do is make sure there is nothing
>>> pending on our request list because if there is, then we need to wait
>>> for any in-flight transfers to complete before disconnecting.
>>
>> shouldn't that check be done in dwc3_gadget_run_stop()?
>
> no, gadget drivers only disconnect pullups when they know there's
> nothing pending. And sometimes, we actually want to break such transfers
> to see how the thing would behave. Only suspend/resume needs to make
> transfers complete before hand.
>
>>> I also wonder if current code isn't really fragile... I mean, when you
>>> clear run_stop bit, you should notify the gadget by means of
>>> ->disconnect() and so on... But since we can't test this with mainline,
>>> then it's difficult to tell.
>>>
>> that is true.
>
> Not sure what to do with this patch :-p
>
:). Maybe we can wait till we have suspend/resume working in mainline.
cheers,
-roger
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] usb: dwc3: gadget: Fix broken gadget on system suspend/resume
2014-11-12 15:40 ` Roger Quadros
@ 2014-11-12 15:54 ` Felipe Balbi
0 siblings, 0 replies; 6+ messages in thread
From: Felipe Balbi @ 2014-11-12 15:54 UTC (permalink / raw)
To: Roger Quadros; +Cc: balbi, linux-usb, linux-omap, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 4853 bytes --]
On Wed, Nov 12, 2014 at 05:40:59PM +0200, Roger Quadros wrote:
> On 11/12/2014 05:36 PM, Felipe Balbi wrote:
> > Hi,
> >
> > On Wed, Nov 12, 2014 at 05:32:00PM +0200, Roger Quadros wrote:
> >> On 11/12/2014 05:08 PM, Felipe Balbi wrote:
> >>> On Wed, Nov 12, 2014 at 04:58:16PM +0200, Roger Quadros wrote:
> >>>> On TI SoCs (e.g. DRA7) we don't support the DWC3 hibernation feature.
> >>>> We need to stop the gadget controller while system suspend
> >>>> else it results in L3 Bus errors on resume with broken
> >>>> USB gadget on J6-evm.
> >>>>
> >>>> [ 55.718226] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x224/0x31c()
> >>>> [ 55.718232] 44000000.ocp:L3 Custom Error: MASTER USB3 TARGET GPMC (Idle): Data Access in User mode during Functional access
> >>>> [ 55.718263] Modules linked in: usb_f_ss_lb g_zero libcomposite configfs xhci_hcd btwilink bluetooth dwc3 6lowpan_iphc m25p80 dwc3_omap omap_remoteproc
> >>>> [ 55.718271] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.19-02011-g3ece3ca-dirty #658
> >>>> [ 55.718290] [<c0016090>] (unwind_backtrace) from [<c0012060>] (show_stack+0x10/0x14)
> >>>> [ 55.718302] [<c0012060>] (show_stack) from [<c062a2e4>] (dump_stack+0x78/0x94)
> >>>> [ 55.718315] [<c062a2e4>] (dump_stack) from [<c0043bc4>] (warn_slowpath_common+0x6c/0x90)
> >>>> [ 55.718325] [<c0043bc4>] (warn_slowpath_common) from [<c0043c7c>] (warn_slowpath_fmt+0x30/0x40)
> >>>> [ 55.718336] [<c0043c7c>] (warn_slowpath_fmt) from [<c030fb24>] (l3_interrupt_handler+0x224/0x31c)
> >>>> [ 55.718348] [<c030fb24>] (l3_interrupt_handler) from [<c0093010>] (handle_irq_event_percpu+0x5c/0x23c)
> >>>> [ 55.718358] [<c0093010>] (handle_irq_event_percpu) from [<c009322c>] (handle_irq_event+0x3c/0x5c)
> >>>> [ 55.718367] [<c009322c>] (handle_irq_event) from [<c0096160>] (handle_fasteoi_irq+0x98/0x158)
> >>>> [ 55.718377] [<c0096160>] (handle_fasteoi_irq) from [<c00929dc>] (generic_handle_irq+0x20/0x30)
> >>>> [ 55.718385] [<c00929dc>] (generic_handle_irq) from [<c000eea8>] (handle_IRQ+0x4c/0xb0)
> >>>> [ 55.718393] [<c000eea8>] (handle_IRQ) from [<c0008638>] (gic_handle_irq+0x28/0x5c)
> >>>> [ 55.718402] [<c0008638>] (gic_handle_irq) from [<c0630964>] (__irq_svc+0x44/0x5c)
> >>>> [ 55.718406] Exception stack(0xc09c1f68 to 0xc09c1fb0)
> >>>> [ 55.718412] 1f60: 00000001 00000001 00000000 00000000 c09c0000 00000000
> >>>> [ 55.718418] 1f80: c09c0000 c09c0000 c0a7a1e4 c09c8938 c09c89b4 00000000 60000093 c09c1fb0
> >>>> [ 55.718423] 1fa0: c008a2e4 c00926cc 60000013 ffffffff
> >>>> [ 55.718433] [<c0630964>] (__irq_svc) from [<c00926cc>] (cpu_startup_entry+0x100/0x1f4)
> >>>> [ 55.718444] [<c00926cc>] (cpu_startup_entry) from [<c0901ac4>] (start_kernel+0x324/0x388)
> >>>>
> >>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
> >>>> ---
> >>>> drivers/usb/dwc3/gadget.c | 8 +++++++-
> >>>> 1 file changed, 7 insertions(+), 1 deletion(-)
> >>>>
> >>>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> >>>> index 3818b26..bc15b54 100644
> >>>> --- a/drivers/usb/dwc3/gadget.c
> >>>> +++ b/drivers/usb/dwc3/gadget.c
> >>>> @@ -2741,7 +2741,13 @@ int dwc3_gadget_prepare(struct dwc3 *dwc)
> >>>
> >>> there is no more dwc3_gadget_prepare(), please rebase on 'next'.
> >>
> >> right.
> >>
> >>>
> >>>> {
> >>>> if (dwc->pullups_connected) {
> >>>> dwc3_gadget_disable_irq(dwc);
> >>>> - dwc3_gadget_run_stop(dwc, true, true);
> >>>> + if (dwc->has_hibernation) {
> >>>> + dwc3_gadget_run_stop(dwc, true, true);
> >>>> + } else {
> >>>> + dwc3_gadget_run_stop(dwc, false, true);
> >>>> + /* remember to connect back on resume */
> >>>> + dwc->pullups_connected = true;
> >>>> + }
> >>>
> >>> Another thing you probably want to do is make sure there is nothing
> >>> pending on our request list because if there is, then we need to wait
> >>> for any in-flight transfers to complete before disconnecting.
> >>
> >> shouldn't that check be done in dwc3_gadget_run_stop()?
> >
> > no, gadget drivers only disconnect pullups when they know there's
> > nothing pending. And sometimes, we actually want to break such transfers
> > to see how the thing would behave. Only suspend/resume needs to make
> > transfers complete before hand.
> >
> >>> I also wonder if current code isn't really fragile... I mean, when you
> >>> clear run_stop bit, you should notify the gadget by means of
> >>> ->disconnect() and so on... But since we can't test this with mainline,
> >>> then it's difficult to tell.
> >>>
> >> that is true.
> >
> > Not sure what to do with this patch :-p
> >
> :). Maybe we can wait till we have suspend/resume working in mainline.
Perhaps... hopefully we won't forget about this :-)
--
balbi
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-11-12 15:54 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-11-12 14:58 [PATCH] usb: dwc3: gadget: Fix broken gadget on system suspend/resume Roger Quadros
[not found] ` <1415804296-28980-1-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
2014-11-12 15:08 ` Felipe Balbi
2014-11-12 15:32 ` Roger Quadros
2014-11-12 15:36 ` Felipe Balbi
2014-11-12 15:40 ` Roger Quadros
2014-11-12 15:54 ` Felipe Balbi
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