Path: csiph.com!weretis.net!feeder4.news.weretis.net!news.unit0.net!news.panservice.it!bofh.it!news.nic.it!robomod From: Kai-Heng Feng Newsgroups: linux.kernel Subject: Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Date: Fri, 16 Jun 2017 05:10:02 +0200 Message-ID: References: X-Original-To: Alan Stern Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=+0Z/gSR0VHUkOdGG6rjk0XhlKsvN6qAWu1JHbt3/6mI=; b=i3Xt/1oeKE7qTYx8Lo1hb0+x9ubMcNGdR8fwCOK/K0Uk6U2wlk7STj4xtp0iw3dcSO hIOiPoqj6bNyPqrPRKHhLhQqjXom+3CkS0mk97eW1+LN+2mxosX4HQz65TyZWHlQqjcH WXsoHKgVVI7mA0078Vbda3/vY68ABXSBSB9puqNONrFIrWawqHwDlsaM/UygUPTK/pEj k2aZL3OrTAcu4mvudNNBOZPrdbqaRUTRveJjSWUuP/1TCxwp5LnHZPZb2QerDDe7x407 lb8+etkESGdP/f9uO0NQB3YBZ0MUUMSiHa4vaIO/7rVcF4dS+wywSbcbHEoPPvrrokNc FeYw== X-Google-Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=+0Z/gSR0VHUkOdGG6rjk0XhlKsvN6qAWu1JHbt3/6mI=; b=TgfDu5YmGVOBMvxDwboWNtX6nVTkqRqRN+i7A3M3pjz82kvHUY60FRhgG5DLD4sOGq 54S3aJALkXCuK/B/mVwxHwWlwkn6KH4F/MUK88/uckJhoV+UbxR2nYJxSwuQLtj+j1/1 reGBpushJ40ydxO/hF+Olt1ghVL4e9dusvr/210mewiyuPUPxAGDXx+d2YW4Hb9948de YnlmtAyyH8uzXqEHQGr1XbsV5nfdSLu9Owo40sqLyg+gvv/UdkyAUs6fsQqWwN19WTI5 dCMwC3dRun1nVLLSeJCHVDHrX2uK85AlCtEHO1Zab2iFRlpIsjhqjhynFohCVPJ/eAsa /CBQ== X-Gm-Message-State: AKS2vOyGRZ5RIBTPkQgvsMC1zJKMif1Q+tEGtqcviB0x+U/C1HgTcWRK q/v1VYWeUJsxCf8yQJzyLU6TMno8wWl3 X-Received: by 10.28.136.196 with SMTP id k187mr5618322wmd.103.1497582462821; Thu, 15 Jun 2017 20:07:42 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 34 Organization: linux.* mail to news gateway X-Original-Cc: Bjorn Helgaas , Bjorn Helgaas , gregkh@linuxfoundation.org, USB list , linux-pci@vger.kernel.org, LKML , "Rafael J. Wysocki" , linux-pm@vger.kernel.org X-Original-Date: Fri, 16 Jun 2017 11:07:42 +0800 X-Original-Message-ID: X-Original-References: X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: csiph.com linux.kernel:1667393 On Thu, Jun 15, 2017 at 10:12 PM, Alan Stern wrote: > On Thu, 15 Jun 2017, Kai-Heng Feng wrote: > >> On Wed, Jun 14, 2017 at 1:28 AM, Bjorn Helgaas wrote: >> > >> > The lspci output [1] shows: >> > >> > 00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39) (prog-if 20 [EHCI]) >> > Capabilities: [c0] Power Management version 2 >> > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+) >> > Status: D3 NoSoftRst- PME-Enable+ DSel=0 DScale=0 PME- >> > Bridge: PM- B3+ >> > >> > The device claims it can assert PME# from D3hot. If it can't, that >> > sounds like a hardware defect that should be addressed with a quirk. >> > Ideally we would also have a pointer to the AMD hardware erratum. >> >> Looks like it's pretty similar to "23 USB Wake on Connect/Disconnect >> with Low Speed Devices" in [1]. >> It points to a workaround in appendix A2 from [2]. >> However it says this bug only effects Low Speed devices, but it >> actually also happens on High Speed devices. >> >> [1] https://support.amd.com/TechDocs/46837.pdf >> [2] https://support.amd.com/TechDocs/42413.pdf > > Those documents refer to a hardware bug with a workaround in the BIOS. > Have you checked to see if your BIOS is up to date? Yes, it's up to date. > > Alan Stern >