linux-kernel - [PATCH v2 0/4] usb: typec: tps6598x: Add IRQ flag and register tracing

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Message-Id: <cover.1613131413.git.agx@sigxcpu.org>
Date:   Fri, 12 Feb 2021 13:04:29 +0100
From:   Guido Günther <agx@...xcpu.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH v2 0/4] usb: typec: tps6598x: Add IRQ flag and register tracing

This series adds tracing events for the chips IRQ and registers that are useful
to figure out the current data and power status. This came about since
diagnosing why a certain usb-c hub or dp-alt-mode adapter fails is hard with
the information in /sys/class/typec alone since this does not have a timeline
of events (and we don't want every typec user having to also buy a PD
analyzer). With this series debugging these kinds of things starts to become
fun:

   # echo 1 > /sys/kernel/debug/tracing/events/tps6598x/enable
   # cat /sys/kernel/debug/tracing/trace_pipe
   irq/79-0-003f-526     [003] ....   512.717871: tps6598x_irq: event1=PLUG_EVENT|DATA_STATUS_UPDATE|STATUS_UPDATE, event2=
   irq/79-0-003f-526     [003] ....   512.722408: tps6598x_status: conn: conn-Ra, pp_5v0: off, pp_hv: off, pp_ext: off, pp_cable: off, pwr-src: vin-3p3, vbus: vSafe0V, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE
   irq/79-0-003f-526     [003] ....   512.727127: tps6598x_data_status: DATA_CONNECTION|USB2_CONNECTION|USB3_CONNECTION
   irq/79-0-003f-526     [003] ....   512.769571: tps6598x_irq: event1=PP_SWITCH_CHANGED|STATUS_UPDATE, event2=
   irq/79-0-003f-526     [003] ....   512.773380: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: vSafe0V, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   512.872450: tps6598x_irq: event1=POWER_STATUS_UPDATE|PD_STATUS_UPDATE, event2=
   irq/79-0-003f-526     [003] ....   512.876311: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: vSafe0V, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   512.880237: tps6598x_power_status: conn: 1, pwr-role: source, typec: usb, bc: sdp
   irq/79-0-003f-526     [003] ....   513.072682: tps6598x_irq: event1=STATUS_UPDATE, event2=
   irq/79-0-003f-526     [003] ....   513.076390: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: vSafe5V, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   513.090676: tps6598x_irq: event1=ERROR_CANNOT_PROVIDE_PWR, event2=
   irq/79-0-003f-526     [003] ....   513.094368: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: vSafe5V, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   513.109606: tps6598x_irq: event1=NEW_CONTRACT_AS_PROVIDER|POWER_STATUS_UPDATE|STATUS_UPDATE|SRC_TRANSITION, event2=
   irq/79-0-003f-526     [003] ....   513.113777: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: pd, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   513.117475: tps6598x_power_status: conn: 1, pwr-role: source, typec: pd, bc: sdp
   irq/79-0-003f-526     [003] ....   513.137469: tps6598x_irq: event1=VDM_RECEIVED, event2=
   irq/79-0-003f-526     [003] ....   513.141570: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: pd, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   513.281926: tps6598x_irq: event1=VDM_RECEIVED, event2=
   irq/79-0-003f-526     [003] ....   513.285638: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: pd, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   513.300515: tps6598x_irq: event1=VDM_RECEIVED|DATA_STATUS_UPDATE, event2=
   irq/79-0-003f-526     [003] ....   513.304226: tps6598x_status: conn: conn-Ra, pp_5v0: out, pp_hv: off, pp_ext: off, pp_cable: in, pwr-src: vin-3p3, vbus: pd, usb-host: no, legacy: no, flags: PLUG_PRESENT|PORTROLE|DATAROLE|VCONN
   irq/79-0-003f-526     [003] ....   513.308302: tps6598x_data_status: DATA_CONNECTION|USB2_CONNECTION|USB3_CONNECTION|DP_CONNECTION, DP pinout D

It should not impose any problems for firmwares that don't have IRQs for the
registers enabled. The trace will then just be missing those events.

Patch is against next-20210210.

changes from v1:
- Fix issues on 32bit arches and missing include spotted by kbuild
  (build testes on mips)



Guido Günther (4):
  usb: typec: tps6598x: Add trace event for IRQ events
  usb: typec: tps6598x: Add trace event for status register
  usb: typec: tps6598x: Add trace event for power status register
  usb: typec: tps6598x: Add trace event for data status

 drivers/usb/typec/Makefile         |   3 +
 drivers/usb/typec/tps6598x.c       |  66 ++++---
 drivers/usb/typec/tps6598x.h       | 185 +++++++++++++++++++
 drivers/usb/typec/tps6598x_trace.h | 283 +++++++++++++++++++++++++++++
 4 files changed, 511 insertions(+), 26 deletions(-)
 create mode 100644 drivers/usb/typec/tps6598x.h
 create mode 100644 drivers/usb/typec/tps6598x_trace.h

-- 
2.30.0