linux-kernel - Re: [PATCH 0/2] mmc: rtsx: card stuck busy fixes for Realtek PCI SD card readers

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Message-ID: <CAPDyKFq4UaB9OZf2nhrja-kv7UwwOXR36Sxa6gF-wDXip=FiVA@mail.gmail.com>
Date: Wed, 21 Jan 2026 13:49:11 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Matthew Schwartz <matthew.schwartz@...ux.dev>, Arnd Bergmann <arnd@...db.de>, 
	Ricky Wu <ricky_wu@...ltek.com>, linux-mmc@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] mmc: rtsx: card stuck busy fixes for Realtek PCI SD
 card readers

On Wed, 21 Jan 2026 at 11:31, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Jan 21, 2026 at 11:13:03AM +0100, Ulf Hansson wrote:
> > On Mon, 5 Jan 2026 at 07:02, Matthew Schwartz
> > <matthew.schwartz@...ux.dev> wrote:
> > >
> > > This series fixes some SD card timeout errors that occur after suspend and
> > > resume ops on systems with Realtek PCI card readers. These issues occur on
> > > my 2 RTS525A card readers and my RTS5261 card reader.
> > >
> > > As a stress test, I ran the amd-s2idle script from amd-debug-tools to
> > > automate s2idle cycles and I launched a visual novel, WITCH ON THE HOLY
> > > NIGHT, from the SD card. Visual novels are basically just slideshows, and
> > > waiting for 10 seconds without advancing the text is an easy way to
> > > trigger rtsx_pci_runtime_suspend/rtsx_pci_runtime_resume. I set amd-s2idle
> > > to test with a 10 second long s2idle length with 13 seconds between runs.
> > >
> > > The main symptom that always shows up is "mmc0: Card stuck being busy!"
> > > followed by timeouts and filesystem errors. This can occur during both
> > > runtime resume and s2idle resume:
> > >
> > > [  260.638214] mmc0: error -110 doing runtime resume
> > > [  261.054214] mmc0: card d555 removed
> > > [  261.054382] Aborting journal on device mmcblk0p1-8.
> > > [  261.054386] JBD2: I/O error when updating journal superblock for mmcblk0p1-8.
> > > [  261.067729] EXT4-fs (mmcblk0p1): shut down requested (2)
> > >
> > > Patch 1 adds a power_off callback so rtsx_pcr can notify the sdmmc driver
> > > during suspend, allowing it to reset prev_power_state. This ensures
> > > sd_power_on properly reinitializes the card on resume. It reduces the
> > > failure rate of "mmc0: Card stuck being busy!" after resume from 20% down
> > > to 4%.
> > >
> > > Patch 2 increases the post-power-on settling delay from 1ms to 5ms. The
> > > shorter delay seems insufficient for reliable reinitialization after the
> > > hardware has been powered off during suspend. Increasing this reduces the
> > > failure rate from 4% down to 0%, tested with over 300 s2idle cycles.
> > >
> > > Matthew Schwartz (2):
> > >   mmc: rtsx: reset power state on suspend
> > >   mmc: rtsx_pci_sdmmc: increase power-on settling delay to 5ms
> > >
> > >  drivers/misc/cardreader/rtsx_pcr.c |  9 +++++++++
> > >  drivers/mmc/host/rtsx_pci_sdmmc.c  | 24 +++++++++++++++++++++++-
> > >  include/linux/rtsx_common.h        |  1 +
> > >  3 files changed, 33 insertions(+), 1 deletion(-)
> > >
> > > --
> > > 2.52.0
> > >
> >
> > Greg, looks like you have queued up these patches via your misc tree,
> > can you please drop them? We need a different approach to the problem.
>
> They need to be reverted (my tree can not be rebased.)  Should I do
> that, or does someone want to send me the reverts?

If you can revert them, that would be great!

Then I will continue to work with Matthew to fix the problem in a more
proper way.

Kind regards
Uffe