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From: ruimeiyan <1906608@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1906608] [NEW]  [Feature request]For some ehci controller, qemu should implement using portsc[26-27] to detect the speed of device.
Date: Thu, 03 Dec 2020 07:08:10 -0000	[thread overview]
Message-ID: <160697929082.24737.7684799499074231317.malonedeb@gac.canonical.com> (raw)

Public bug reported:

for some ehci controller ,for example ehci controller on fsl_imx6,it
using portsc[26-27] to decide a full speed device or high speed device
was connected, hub-ehci.c should set the portsc[26-27] to return the
right speed.

line:1001 in hub-ehci.c
        if (dev && dev->attached && (dev->speedmask & USB_SPEED_MASK_HIGH)) {
            val |= PORTSC_PED;
        }

below is the spec for fsl_imx6 USB PART.
PORTSC:27–26 :PSPD
Port Speed - Read Only.
This register field indicates the speed at which the port is operating.
00 Full Speed
01 Low Speed
10 High Speed
11 Undefined

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1906608

Title:
   [Feature request]For some ehci controller, qemu should implement
  using portsc[26-27]  to detect the speed of device.

Status in QEMU:
  New

Bug description:
  for some ehci controller ,for example ehci controller on fsl_imx6,it
  using portsc[26-27] to decide a full speed device or high speed device
  was connected, hub-ehci.c should set the portsc[26-27] to return the
  right speed.

  line:1001 in hub-ehci.c
          if (dev && dev->attached && (dev->speedmask & USB_SPEED_MASK_HIGH)) {
              val |= PORTSC_PED;
          }

  below is the spec for fsl_imx6 USB PART.
  PORTSC:27–26 :PSPD
  Port Speed - Read Only.
  This register field indicates the speed at which the port is operating.
  00 Full Speed
  01 Low Speed
  10 High Speed
  11 Undefined

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             reply	other threads:[~2020-12-03  7:16 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-03  7:08 ruimeiyan [this message]
2021-05-10 19:03 ` [Bug 1906608] Re: [Feature request]For some ehci controller, qemu should implement using portsc[26-27] to detect the speed of device Thomas Huth
2021-07-10  4:17 ` Launchpad Bug Tracker

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