linux-kernel - [PATCH v2 0/2] usb: dwc2: fill in gadget caps, configure it for stm32mp15

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Date:   Fri, 8 Oct 2021 09:53:07 +0200
From:   Fabrice Gasnier <fabrice.gasnier@...s.st.com>
To:     <hminas@...opsys.com>, <gregkh@...uxfoundation.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <amelie.delaunay@...s.st.com>, <alexandre.torgue@...s.st.com>,
        <fabrice.gasnier@...s.st.com>
Subject: [PATCH v2 0/2] usb: dwc2: fill in gadget caps, configure it for stm32mp15

This patchset fills in 'otg_caps' of the usb_gadget structure, and
configures it on stm32mp15.

When dwc2 is configured as dual role (OTG), the USB gadget descriptors
(device mode) are configured via configfs. This lead in calling
usb_otg_descriptor_init().
In usb_otg_descriptor_init() (drivers/usb/gadget/config.c):
- If otg caps structure is provided -> use it
- If otg caps structure isn't provided -> HNP and SRP are enabled by default

This could lead to a configuration mismatch beetween:
- OTG controller: HNP and SRP aren't enabled
- gadget descriptors: HNP and SRP are advertised

---
Changes in v2:
- replace otg_cap bit field by otg_caps structure.
- Fix build issue when HOST only mode is selected [1]
- DT patch for stm32mp151 merged in v1, so not resent

[1] https://syzkaller.appspot.com/bug?extid=7af597ce2b38596c16ea

Fabrice Gasnier (2):
  usb: dwc2: add otg_rev and otg_caps information for gadget driver
  usb: dwc2: stm32mp15: set otg_rev

 drivers/usb/dwc2/core.h    | 19 ++++++------
 drivers/usb/dwc2/debugfs.c |  4 ++-
 drivers/usb/dwc2/gadget.c  |  1 +
 drivers/usb/dwc2/hcd.c     | 12 +++-----
 drivers/usb/dwc2/params.c  | 75 ++++++++++++++++++++++++++--------------------
 5 files changed, 59 insertions(+), 52 deletions(-)

-- 
2.7.4