linux-kernel - Re: [Bug] SD card reader in Acer Aspire S5 broken in 4.20-rc

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Message-ID: <20181204001009.GA85090@google.com>
Date:   Mon, 3 Dec 2018 18:10:09 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org, ptalbert@...hat.com
Subject: Re: [Bug] SD card reader in Acer Aspire S5 broken in 4.20-rc

On Wed, Nov 28, 2018 at 02:05:21PM -0600, Bjorn Helgaas wrote:
> On Wed, Nov 28, 2018 at 6:13 AM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> > On Tuesday, November 27, 2018 9:25:14 PM CET Bjorn Helgaas wrote:
> > > On Mon, Nov 26, 2018 at 11:37:20PM +0100, Rafael J. Wysocki wrote:
> > > > On Monday, November 26, 2018 7:03:58 PM CET Rafael J. Wysocki wrote:
> > > > > Hi Bjorn,
> > > > >
> > > > > The SD card reader in my Acer Aspire S5 doesn't work with 4.20-rc.
> > > > >
> > > > > Here's what lspci -v says about it (in a bad kernel):
> > > > >
> > > > > 02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader
> > > > > (rev 01)
> > > > >         Subsystem: Acer Incorporated [ALI] Device 0704
> > > > >         Flags: bus master, fast devsel, latency 0, IRQ 35
> > > > >         Memory at d9001000 (32-bit, non-prefetchable) [size=4K]
> > > > >         Capabilities: [40] Power Management version 3
> > > > >         Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
> > > > >         Capabilities: [70] Express Endpoint, MSI 00
> > > > >         Capabilities: [100] Advanced Error Reporting
> > > > >         Capabilities: [140] Device Serial Number 00-00-00-01-00-4c-e0-00
> > > > >         Kernel driver in use: rtsx_pci
> > > > >         Kernel modules: rtsx_pci
> > >
> > > Thanks a lot for bisecting this!
> > >
> > > With a good kernel (v4.19 or v4.20-rc with 17c91487364f reverted),
> > > would you mind collecting "lspci -vv" output, the dmesg log with
> > > "pci=earlydump", and the FADT dump?
> >
> > All of the information is attached to the BZ entry at
> >
> > https://bugzilla.kernel.org/show_bug.cgi?id=201801
> 
> Thanks!  I hope Patrick has a chance to look at this.  Per the
> bugzilla mentioned in 17c91487364f, it fixes a problem with a custom
> proprietary PCIe device, and there's a lot of good detailed analysis
> there, so hopefully we can figure out a way to address both
> situations.

I queued up a revert on for-linus, since we haven't made any progress on
this yet.  I'll be on vacation much of this week, but I want to get
the revert (or better, a fix if we can find one) in before -rc6 comes
out next Sunday.

If we figure out a fix before then, I'll drop the revert and use the
fix instead.

Bjorn