[PATCH v2 1/1] ucsi_ccg: Check DEV_INT bit only when starting CCG4

[PATCH v2 1/1] ucsi_ccg: Check DEV_INT bit only when starting CCG4

[Wayne Chang]

From: Sing-Han Chen <singhanc@nvidia.com>

after driver sending the UCSI_START cmd, CCGx would
clear Bit 0:Device Interrupt in the INTR_REG if CCGX
reset successfully.

however, there might be a chance that other bits in
INTR_REG are not cleared due to internal data queued
in PPM and cause the driver thinks CCGx reset failed.

the commit checks bit 0 in INTR_REG and ignore other
bits. ucsi driver would reset PPM later.

Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
Signed-off-by: Wayne Chang <waynec@nvidia.com>
---
 drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
index bff96d64dddf..6db7c8ddd51c 100644
--- a/drivers/usb/typec/ucsi/ucsi_ccg.c
+++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
@@ -325,7 +325,7 @@ static int ucsi_ccg_init(struct ucsi_ccg *uc)
 		if (status < 0)
 			return status;
 
-		if (!data)
+		if (!(data & DEV_INT))
 			return 0;
 
 		status = ccg_write(uc, CCGX_RAB_INTR_REG, &data, sizeof(data));
-- 
2.25.1

Re: [PATCH v2 1/1] ucsi_ccg: Check DEV_INT bit only when starting CCG4

[Greg KH]

On Tue, Jan 11, 2022 at 09:36:43PM +0800, Wayne Chang wrote:
> From: Sing-Han Chen <singhanc@nvidia.com>
> 
> after driver sending the UCSI_START cmd, CCGx would
> clear Bit 0:Device Interrupt in the INTR_REG if CCGX
> reset successfully.
> 
> however, there might be a chance that other bits in
> INTR_REG are not cleared due to internal data queued
> in PPM and cause the driver thinks CCGx reset failed.
> 
> the commit checks bit 0 in INTR_REG and ignore other
> bits. ucsi driver would reset PPM later.
> 
> Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
> Signed-off-by: Wayne Chang <waynec@nvidia.com>
> ---
>  drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

What commit id does this fix?

thanks,

greg k-h

Re: [PATCH v2 1/1] ucsi_ccg: Check DEV_INT bit only when starting CCG4

[Wayne Chang]

Hi Greg,
Thanks for the review.

On 1/11/22 10:03 PM, Greg KH wrote:
> 
> 
> On Tue, Jan 11, 2022 at 09:36:43PM +0800, Wayne Chang wrote:
>> From: Sing-Han Chen <singhanc@nvidia.com>
>>
>> after driver sending the UCSI_START cmd, CCGx would
>> clear Bit 0:Device Interrupt in the INTR_REG if CCGX
>> reset successfully.
>>
>> however, there might be a chance that other bits in
>> INTR_REG are not cleared due to internal data queued
>> in PPM and cause the driver thinks CCGx reset failed.
>>
>> the commit checks bit 0 in INTR_REG and ignore other
>> bits. ucsi driver would reset PPM later.
>>
>> Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
>> Signed-off-by: Wayne Chang <waynec@nvidia.com>
>> ---
>>   drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> What commit id does this fix?
The change is to fix the defect of ucsi_ccg_init func based on the CCGx 
spec.
The original implementation's commit Id is i247c554a14aa1.

> thanks,
> 
> greg k-h
> 

thanks,
Wayne.

Re: [PATCH v2 1/1] ucsi_ccg: Check DEV_INT bit only when starting CCG4

[Greg KH]

On Tue, Jan 11, 2022 at 02:15:17PM +0000, Wayne Chang wrote:
> Hi Greg,
> Thanks for the review.
> 
> On 1/11/22 10:03 PM, Greg KH wrote:
> > 
> > 
> > On Tue, Jan 11, 2022 at 09:36:43PM +0800, Wayne Chang wrote:
> >> From: Sing-Han Chen <singhanc@nvidia.com>
> >>
> >> after driver sending the UCSI_START cmd, CCGx would
> >> clear Bit 0:Device Interrupt in the INTR_REG if CCGX
> >> reset successfully.
> >>
> >> however, there might be a chance that other bits in
> >> INTR_REG are not cleared due to internal data queued
> >> in PPM and cause the driver thinks CCGx reset failed.
> >>
> >> the commit checks bit 0 in INTR_REG and ignore other
> >> bits. ucsi driver would reset PPM later.
> >>
> >> Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
> >> Signed-off-by: Wayne Chang <waynec@nvidia.com>
> >> ---
> >>   drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > What commit id does this fix?
> The change is to fix the defect of ucsi_ccg_init func based on the CCGx 
> spec.
> The original implementation's commit Id is i247c554a14aa1.

Great, can you resend this with a proper "Fixes:" tag on it?

thanks,

greg k-h

Re: [PATCH v2 1/1] ucsi_ccg: Check DEV_INT bit only when starting CCG4

[Wayne Chang]

On 1/11/22 10:25 PM, Greg KH wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Tue, Jan 11, 2022 at 02:15:17PM +0000, Wayne Chang wrote:
>> Hi Greg,
>> Thanks for the review.
>>
>> On 1/11/22 10:03 PM, Greg KH wrote:
>>>
>>>
>>> On Tue, Jan 11, 2022 at 09:36:43PM +0800, Wayne Chang wrote:
>>>> From: Sing-Han Chen <singhanc@nvidia.com>
>>>>
>>>> after driver sending the UCSI_START cmd, CCGx would
>>>> clear Bit 0:Device Interrupt in the INTR_REG if CCGX
>>>> reset successfully.
>>>>
>>>> however, there might be a chance that other bits in
>>>> INTR_REG are not cleared due to internal data queued
>>>> in PPM and cause the driver thinks CCGx reset failed.
>>>>
>>>> the commit checks bit 0 in INTR_REG and ignore other
>>>> bits. ucsi driver would reset PPM later.
>>>>
>>>> Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
>>>> Signed-off-by: Wayne Chang <waynec@nvidia.com>
>>>> ---
>>>>    drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> What commit id does this fix?
>> The change is to fix the defect of ucsi_ccg_init func based on the CCGx
>> spec.
>> The original implementation's commit Id is i247c554a14aa1.
> 
> Great, can you resend this with a proper "Fixes:" tag on it?
Sure. Will do. Thanks for the review.
> 
> thanks,
> 
> greg k-h
> 

thanks,
Wayne.