[PATCH 0/5] usb: host: xhci-plat: omit shared hcd if either of the root hubs has no ports

From: Heiner Kallweit <hkallweit1@gmail.com>
To: Mathias Nyman <mathias.nyman@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linux USB Mailing List <linux-usb@vger.kernel.org>,
	"open list:ARM/Amlogic Meson..."
	<linux-amlogic@lists.infradead.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Jack Pham <quic_jackp@quicinc.com>,
	Tung Nguyen <tunguyen@apm.com>
Subject: [PATCH 0/5] usb: host: xhci-plat: omit shared hcd if either of the root hubs has no ports
Date: Fri, 4 Mar 2022 19:32:58 +0100	[thread overview]
Message-ID: <18a93669-7f7a-dad8-38f4-44819fc3b64a@gmail.com> (raw)

I have a system with a low-cost Amlogic S905W SoC that supports USB3
but has a USB3 root hub with no ports. This results in an error
message and a hcd that is good for nothing. The USB2 root hub has
ports and works normally.
I think we can do better and omit creating a shared hcd if either of
the root hubs has no ports. This series is based on discussion [0].

The series works as intended for me. What I couldn't test is the case
of the USB2 root hub having no ports.

[0] https://www.spinics.net/lists/linux-usb/msg223416.html

Heiner Kallweit (5):
  usb: host: xhci-plat: create shared hcd after having added main hcd
  xhci: factor out parts of xhci_gen_setup()
  xhci: prepare for operation w/o shared hcd
  usb: host: xhci-plat: prepare operation w/o shared hcd
  xhci: support omitting shared hcd if either of the root hubs has no ports

 drivers/usb/host/xhci-hub.c  |   3 +-
 drivers/usb/host/xhci-mem.c  |  11 +--
 drivers/usb/host/xhci-plat.c |  43 ++++++----
 drivers/usb/host/xhci.c      | 155 ++++++++++++++++++++---------------
 drivers/usb/host/xhci.h      |  20 +++++
 5 files changed, 140 insertions(+), 92 deletions(-)

-- 
2.35.1

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