realtek RTS525A sdcard reader unusable on HWE kernel

[Mathias Bavay]

My integrated sdcard reader (realtek RTS525A accessed via PCI) works fine with kernels 5.15 but does not work anymore with kernels 5.19:
[ 48.704327] rtsx_pci 0000:3c:00.0: Unable to change power state from D0 to D3hot, device inaccessible
[ 53.741438] rtsx_pci 0000:3c:00.0: Unable to change power state from D3cold to D0, device inaccessible

This means that when inserting an sdcard into the reader, the media is not seen (and there is no new device in /dev).

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-generic-hwe-22.04 5.19.0.43.44~22.04.17
ProcVersionSignature: Ubuntu 5.15.0-73.80-generic 5.15.98
Uname: Linux 5.15.0-73-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Fri Jun 2 09:21:42 2023
InstallationDate: Installed on 2020-02-25 (1192 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: linux-meta-hwe-5.19
UpgradeStatus: Upgraded to jammy on 2022-10-25 (219 days ago)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2020-10-16T17:07:32.414229

[Mathias Bavay (bavay)]

The outputs of lspci also slightly differ for kernel 5.15 and kernel 5.19. On 5.15, it reports:

3c:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)

On 5.19, it reports:

3c:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev ff)

So I guess this is a bug in the driver...

[Mathias Bavay (bavay)]

This also affects linux-image-6.2.0-26-generic:

[ 1.634400] rtsx_pci 0000:3c:00.0: enabling device (0000 -> 0002)
[ 79.772070] rtsx_pci 0000:3c:00.0: Unable to change power state from D0 to D3hot, device inaccessible

[Mathias Bavay (bavay)]

This also affects 6.5.0-15-generic:

[ 1.690266] rtsx_pci 0000:3c:00.0: enabling device (0000 -> 0002)
[ 593.556083] rtsx_pci 0000:3c:00.0: Unable to change power state from D0 to D3hot, device inaccessible

[Mathias Bavay (bavay)]

As a side note, It could be related to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1929444 (but still not exactly the same)