Bug#1125797: linux: trixie stable update regresses for rtw88 driver

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From	Bastian Germann <bage@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1125797: linux: trixie stable update regresses for rtw88 driver
Date	Sun, 18 Jan 2026 00:30:01 +0100
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Source: linux
Version: 6.12.63-1
Severity: important
Tags: upstream

The recently released trixie stable update contains change:
wifi: rtw88: sdio: use indirect IO for device registers before power-on
(linux stable commit bc1ca06998c1cb6d58e02e0f28c032ec88eb45dd)

This regresses and kills my wifi. The following linux-stable v6.12.64
already has the fix with a description of the bug that I am experiencing:

commit 1f8ae2e99a9df11a7951d972c119a2f0d3a41a6a
Author: Ping-Ke Shih <pkshih@realtek.com>
Date:   Tue Nov 25 09:38:49 2025 +0800

    wifi: rtw88: limit indirect IO under powered off for RTL8822CS

    [ Upstream commit f3ccdfda345ca9a624ea425840a926b8338c1e25 ]

    The indirect IO is necessary for RTL8822CS, but not necessary for other
    chips. Otherwiese, it throws errors and becomes unusable.

     rtw88_8723cs mmc1:0001:1: WOW Firmware version 11.0.0, H2C version 0
     rtw88_8723cs mmc1:0001:1: Firmware version 11.0.0, H2C version 0
     rtw88_8723cs mmc1:0001:1: sdio read32 failed (0xf0): -110
     rtw88_8723cs mmc1:0001:1: sdio write8 failed (0x1c): -110
     rtw88_8723cs mmc1:0001:1: sdio read32 failed (0xf0): -110

    By vendor driver, only RTL8822CS and RTL8822ES need indirect IO, but
    RTL8822ES isn't supported yet. Therefore, limit it to RTL8822CS only.

    Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
    Closes: https://lore.kernel.org/linux-wireless/07a32e2d6c764eb1bd9415b5a921a652@realtek.com/T/#m997b4522f7209ba629561c776bfd1d13a
b24c1d4
    Fixes: 58de1f91e033 ("wifi: rtw88: sdio: use indirect IO for device registers before power-on")
    Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
    Tested-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
    Link: https://patch.msgid.link/1764034729-1251-1-git-send-email-pkshih@realtek.com
    Signed-off-by: Sasha Levin <sashal@kernel.org>

Please upload a stable update as soon as possible.

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Bug#1125797: linux: trixie stable update regresses for rtw88 driver Bastian Germann <bage@debian.org> - 2026-01-18 00:30 +0100
  Processed: Re: Bug#1125797: linux: trixie stable update regresses  for rtw88 driver "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-01-18 17:40 +0100
  Processed: Re: Bug#1125797: linux: trixie stable update regresses  for rtw88 driver "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-01-18 17:40 +0100
  Bug#1125797: linux: trixie stable update regresses for rtw88 driver Salvatore Bonaccorso <carnil@debian.org> - 2026-01-18 17:40 +0100
  Bug#1125797: found 1125797 in 6.17.8-1, found 1125797 in 6.18~rc4-1~exp1, closing 1125797, closing 1125797 Salvatore Bonaccorso <carnil@debian.org> - 2026-01-18 20:50 +0100

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