linux-kernel - Re: iwlwifi broken in post-linux-6.3.0 after April 26

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Date:   Sun, 30 Apr 2023 18:58:44 +0800
From:   Jeff Chua <jeff.chua.linux@...il.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gregory Greenman <gregory.greenman@...el.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Linux Wireless <linux-wireless@...r.kernel.org>,
        Linux Networking <netdev@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Johannes Berg <johannes.berg@...el.com>
Subject: Re: iwlwifi broken in post-linux-6.3.0 after April 26

On Sun, Apr 30, 2023 at 2:17 AM Jeff Chua <jeff.chua.linux@...il.com> wrote:
>
> On Sat, Apr 29, 2023 at 10:07 PM Bagas Sanjaya <bagasdotme@...il.com> wrote:
> >
> > On Sat, Apr 29, 2023 at 01:22:03PM +0800, Jeff Chua wrote:
> > > Can't start wifi on latest linux git pull ... started happening 3 days ago ...
> >
> > Are you testing mainline?
>
> I'm pulling from https://github.com/torvalds/linux.git, currently at ...
>
> commit 1ae78a14516b9372e4c90a89ac21b259339a3a3a (HEAD -> master,
> origin/master, origin/HEAD)
> Merge: 4e1c80ae5cf4 74d7970febf7
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Sat Apr 29 11:10:39 2023 -0700
>
> > Certainly you should do bisection.
>
> ok, will do.

Bisected!

ef3ed33dfc8f0f1c81ca103e6b68b4f77ee0ab65 is the first bad commit
commit ef3ed33dfc8f0f1c81ca103e6b68b4f77ee0ab65
Author: Gregory Greenman <gregory.greenman@...el.com>
Date:   Sun Apr 16 15:47:33 2023 +0300

    wifi: iwlwifi: bump FW API to 77 for AX devices

    Start supporting API version 77 for AX devices.

    Signed-off-by: Gregory Greenman <gregory.greenman@...el.com>
    Link: https://lore.kernel.org/r/20230416154301.e522ccefe354.If7628363fafeb7687163103e734206915c445197@changeid
    Signed-off-by: Johannes Berg <johannes.berg@...el.com>

 drivers/net/wireless/intel/iwlwifi/cfg/22000.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


I had to downgrade FW API to 75 to make it work again!

--- a/drivers/net/wireless/intel/iwlwifi/cfg/22000.c    2023-04-30
18:27:21.719983505 +0800
+++ a/drivers/net/wireless/intel/iwlwifi/cfg/22000.c    2023-04-30
18:27:25.749983446 +0800
@@ -10,7 +10,7 @@
 #include "fw/api/txq.h"

 /* Highest firmware API version supported */
-#define IWL_22000_UCODE_API_MAX        78
+#define IWL_22000_UCODE_API_MAX        75

 /* Lowest firmware API version supported */
 #define IWL_22000_UCODE_API_MIN        39


My h/w is Lenovo X1 with ...

00:14.3 Network controller: Intel Corporation Alder Lake-P PCH CNVi
WiFi (rev 01)


I've the following firmware .. I've tried 77, 78, 79, 81 .. .all not working

-rw-r--r-- 1 root root 1560532 Mar 14 08:05 iwlwifi-so-a0-gf-a0-72.ucode
-rw-r--r-- 1 root root 1563692 Mar  6 14:07 iwlwifi-so-a0-gf-a0-73.ucode
-rw-r--r-- 1 root root 1577460 Mar 14 08:05 iwlwifi-so-a0-gf-a0-74.ucode
-rw-r--r-- 1 root root 1641260 Mar  6 14:07 iwlwifi-so-a0-gf-a0-77.ucode
-rw-r--r-- 1 root root 1667236 Mar  6 14:07 iwlwifi-so-a0-gf-a0-78.ucode
-rw-r--r-- 1 root root 1672988 Mar  6 14:07 iwlwifi-so-a0-gf-a0-79.ucode
-rw-r--r-- 1 root root 1682852 Apr  5 08:22 iwlwifi-so-a0-gf-a0-81.ucode


# working dmesg attached ...
cfg80211: Loading compiled-in X.509 certificates for regulatory database
Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
iwlwifi 0000:00:14.3: enabling device (0000 -> 0002)
iwlwifi 0000:00:14.3: Direct firmware load for
iwlwifi-so-a0-gf-a0-75.ucode failed with error -2
iwlwifi 0000:00:14.3: api flags index 2 larger than supported by driver
thermal thermal_zone1: failed to read out thermal zone (-61)
iwlwifi 0000:00:14.3: Sorry - debug buffer is only 4096K while you
requested 65536K