Hi, thanks for your help in reviewing the code, and happy new year to you and your family!
For the first commit you mentioned (modification time is 27ms), I understand that just modify the include/linux/usb/pd.h file: diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h index d50098fb16b5..cd2cc535d21d 100644 --- a/include/linux/usb/pd.h +++ b/include/linux/usb/pd.h @@ -457,7 +457,7 @@ static inline unsigned int rdo_max_power(u32 rdo) #define PD_T_NO_RESPONSE 5000 /* 4.5 - 5.5 seconds */ #define PD_T_DB_DETECT 10000 /* 10 - 15 seconds */ #define PD_T_SEND_SOURCE_CAP 150 /* 100 - 200 ms */ -#define PD_T_SENDER_RESPONSE 60 /* 24 - 30 ms, relaxed */ +#define PD_T_SENDER_RESPONSE 27 /* 24 - 30 ms, relaxed */ #define PD_T_RECEIVER_RESPONSE 15 /* 15ms max */ #define PD_T_SOURCE_ACTIVITY 45 #define PD_T_SINK_ACTIVITY 135
Is my understanding correct?
Thanks Jos Wang
On Sun, Dec 22, 2024 at 9:14 PM Dmitry Baryshkov dmitry.baryshkov@linaro.org wrote:
On Sun, Dec 22, 2024 at 06:52:39PM +0800, joswang wrote:
From: Jos Wang joswang@lenovo.com
According to the USB PD3 CTS specification (https://usb.org/document-library/ usb-power-delivery-compliance-test-specification-0/ USB_PD3_CTS_Q4_2024_OR.zip), the requirements for tSenderResponse are different in PD2 and PD3 modes, see Table 19 Timing Table & Calculations. For PD2 mode, the tSenderResponse min 24ms and max 30ms; for PD3 mode, the tSenderResponse min 27ms and max 33ms.
For the "TEST.PD.PROT.SRC.2 Get_Source_Cap No Request" test item, after receiving the Source_Capabilities Message sent by the UUT, the tester deliberately does not send a Request Message in order to force the SenderResponse timer on the Source UUT to timeout. The Tester checks that a Hard Reset is detected between tSenderResponse min and max，the delay is between the last bit of the GoodCRC Message EOP has been sent and the first bit of Hard Reset SOP has been received. The current code does not distinguish between PD2 and PD3 modes, and tSenderResponse defaults to 60ms. This will cause this test item and the following tests to fail: TEST.PD.PROT.SRC3.2 SenderResponseTimer Timeout TEST.PD.PROT.SNK.6 SenderResponseTimer Timeout
Considering factors such as SOC performance, i2c rate, and the speed of PD chip sending data, "pd2-sender-response-time-ms" and "pd3-sender-response-time-ms" DT time properties are added to allow users to define platform timing. For values that have not been explicitly defined in DT using this property, a default value of 27ms for PD2 tSenderResponse and 30ms for PD3 tSenderResponse is set.
You have several different changes squashed into the same commit:
- Change the timeout from 60 ms to 27-30 ms (I'd recommend using 27 ms as it fits both 24-30 ms and 27-33 ms ranges,
- Make timeout depend on the PD version,
- Make timeouts configurable via DT.
Only the first item is a fix per se and only that change should be considered for backporting. Please unsquash your changes into logical commits. Theoretically the second change can be thought about as a part of the third change (making timeouts configurable) or of the fist change (fix the timeout to follow the standard), but I'd suggest having three separate commits.
Fixes: 2eadc33f40d4 ("typec: tcpm: Add core support for sink side PPS") Cc: stable@vger.kernel.org Signed-off-by: Jos Wang joswang@lenovo.com
v1 -> v2:
- modify the commit message
- patch 1/2 and patch 2/2 are placed in the same thread
-- With best wishes Dmitry