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From: Suniel Mahesh <sunil@amarulasolutions.com>
Date: Tue, 9 Jan 2024 12:47:21 +0530
Message-ID: <CAM+7aWvmmyyLN5YHuJhg_X402OFmP_sVe6h_mr5tURjv0Ti5vQ@mail.gmail.com>
Subject: USB PD TYPEC - FUSB302B port controller hard reset issue
To: Guenter Roeck <linux@roeck-us.net>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, 
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-kernel@vger.kernel.org, 
	USB list <linux-usb@vger.kernel.org>
Cc: Jagan Teki <jagan@amarulasolutions.com>, Da Xue <da.xue@libretech.co>, 
	Da Xue <da@lessconfused.com>, Da Xue <da@libre.computer>, Kyle Tso <kyletso@google.com>, 
	RD Babiera <rdbabiera@google.com>
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Hi Guenter/Heikki/Greg and all,

This email is a narrowed version of the earlier discussion at:
https://lore.kernel.org/all/CAM+7aWt7hJSmJQ78Fes0jMcrF9E8yhN=sDgYuU-hBxO0+1Uj0g@mail.gmail.com/T/

Please guide/suggest on why the FUSB302B port controller on a target board
is getting reset(hard reset) on reception of a 0x0 packet from source(PD Wall
charger 100W - 20V@5A).

log when reset:

[    1.599049] FUSB302: IRQ: 0x80, a: 0x00, b: 0x00, status0: 0x83
[    1.602836] FUSB302: IRQ: 0x00, a: 0x40, b: 0x00, status0: 0x83
[    1.606210] TCPM: tcpm_pd_event_handler: in TCPM_CC_EVENT
[    1.968179] FUSB302: IRQ: 0x80, a: 0x00, b: 0x00, status0: 0x83
[    2.133140] FUSB302: IRQ: 0x41, a: 0x04, b: 0x00, status0: 0x93
[    2.133704] FUSB302: IRQ: PD tx success
[    2.136046] FUSB302: PD message header: 161
[    2.136392] FUSB302: PD message len: 0
[    2.136845] TCPM: PD TX complete, status: 0
[    2.139382] FUSB302: IRQ: 0x51, a: 0x00, b: 0x00, status0: 0x93
[    2.142192] FUSB302: IRQ: 0x51, a: 0x00, b: 0x01, status0: 0x93
[    2.142804] FUSB302: IRQ: PD sent good CRC
[    2.145274] FUSB302: PD message header: 1a3
[    2.145674] FUSB302: PD message len: 0
[    2.146072] FUSB302: fusb302_pd_read_message: to tcpm_pd_receive
[    2.146478] TCPM: PD RX, header: 0x1a3 [1]
[    2.147042] TCPM: tcpm_pd_ctrl_request: type:0x3
[    2.147435] TCPM: tcpm_pd_ctrl_request: case PD_CTRL_ACCEPT
[    2.146309] TCPM: tcpm_pd_ctrl_request: case SOFT_RESET_SEND
[    2.148266] TCPM: tcpm_pd_rx_handler: done
[    2.158196] FUSB302: IRQ: 0x51, a: 0x00, b: 0x01, status0: 0x93
[    2.158600] FUSB302: IRQ: PD sent good CRC
[    2.161283] FUSB302: PD message header: 0
[    2.161710] FUSB302: PD message len: 0
[    2.162092] FUSB302: fusb302_pd_read_message: to tcpm_pd_receive
[    2.162608] TCPM: PD RX, header: 0x0 [1]
[    2.163181] TCPM: tcpm_pd_rx_handler: done
[    2.179843] FUSB302: IRQ: 0x41, a: 0x01, b: 0x00, status0: 0x83
[    2.180314] FUSB302: IRQ: PD received hardreset: interrupta: 1
[    2.181125] FUSB302: fusb302_pd_reset:
[    2.182597] TCPM: tcpm_pd_event_handler:
[    2.182937] TCPM: tcpm_pd_event_handler: TCPM_RESET_EVENT
[    2.183292] TCPM: _tcpm_pd_hard_reset: Received hard reset
[    2.183770] TCPM: _tcpm_pd_hard_reset:

Let me know if you need anymore details.

Thanks and Regards
-- 
Suniel Mahesh
Embedded Linux and Kernel Engineer
Amarula Solutions India