2022-01-07 09:25:04

by Wayne Chang

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

From: Sing-Han Chen <[email protected]>

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 <[email protected]>
Signed-off-by: WayneChang <[email protected]>
---
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

2022-01-10 11:40:58

by Heikki Krogerus

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

Hi,

On Fri, Jan 07, 2022 at 05:24:55PM +0800, Wayne Chang wrote:
> From: Sing-Han Chen <[email protected]>
>
> 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 <[email protected]>
> Signed-off-by: WayneChang <[email protected]>
^^^^^^^^^^
You probable should have a space there. In any case, FWIW:

Acked-by: Heikki Krogerus <[email protected]>

> ---
> 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/rivers/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

thanks,

--
heikki

2022-01-11 13:29:54

by Wayne Chang

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

Hi Heikki,

Thanks for the review.

On 1/10/22 7:40 PM, Heikki Krogerus wrote:
>
>
> Hi,
>
> On Fri, Jan 07, 2022 at 05:24:55PM +0800, Wayne Chang wrote:
>> From: Sing-Han Chen <[email protected]>
>>
>> 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 <[email protected]>
>> Signed-off-by: WayneChang <[email protected]>
> ^^^^^^^^^^
> You probable should have a space there. In any case, FWIW:
>
> Acked-by: Heikki Krogerus <[email protected]>
>

Yes, I'll update the commit message and send it out.

>> ---
>> 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/rivers/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
>
> thanks,
>
> --
> heikki
>

thanks,
Wayne.