linux-kernel - sdhci_pci module is blocking low power s0ix sleep with GL9767

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Message-ID: <8235497b-421c-4af7-90e4-95ad4e271ead@tuxedocomputers.com>
Date: Thu, 26 Sep 2024 17:31:48 +0200
From: Georg Gottleuber <ggo@...edocomputers.com>
To: Georg Gottleuber <ggo@...edocomputers.com>
Cc: victor.shih@...esyslogic.com.tw, Lucas.Lai@...esyslogic.com.tw,
 Greg.tu@...esyslogic.com.tw, HL.Liu@...esyslogic.com.tw,
 adrian.hunter@...el.com, ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: sdhci_pci module is blocking low power s0ix sleep with GL9767

Hello,

I have a problem with s0ix sleep on a laptop with GL9767 SD card reader.

The device is a TUXEDO InfinityBook Pro 14 Gen9 Intel laptop and 
consumes 6 watts in s2idle (not reaching s0ix). If I blacklist sdhci_pci 
in /etc/modprobe.d/blacklist.conf then the device sleeps with 1.2 watts 
(this is not super good, but OK). Unfortunately unloading and reloading 
does not work either. Once the module has been loaded, the high power 
consumption remains, even after a rmmod.

I tested this behavior with linux mainline 6.11, 
6.11.0-rc7-next-20240909. Kernel mmc/next does not work either.

In an AMD device (InfinityBook Pro 14 Gen9 AMD), however, the same card 
reader sleeps without any problems.

Link https://bugzilla.kernel.org/show_bug.cgi?id=219284

Any ideas?

Kind regards
Georg Gottleuber