linux-kernel - Re: [PATCH] leds: fix wrong dmi

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Message-ID: <alpine.LNX.2.00.1803181509330.7595@T420s>
Date:   Sun, 18 Mar 2018 15:24:57 +0100 (CET)
From:   Hans Ulli Kroll <ulli.kroll@...glemail.com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
cc:     Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        Alan Mizrahi <alan@...rahi.com.ve>,
        Richard Purdie <rpurdie@...ys.net>,
        Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH] leds: fix wrong dmi_match on PC Engines APU LEDs

Hi Jacek

On Sat, 10 Mar 2018, Jacek Anaszewski wrote:

> Hi Hans,
> 
> Thank you for the patch.
> 
> On 03/05/2018 06:09 PM, Hans Ulli Kroll wrote:
> > APU has compared to APU2 no DMI_BOARD_NAME.
> > Use DMI_PRODUCT_NAME instead.
> 
> Could we have the commit message more expressive?
> 
> Is it that now this driver doesn't work for APU board?

Yes it doesn't work for my APU board.
I've already checked the updated driver in -next

As you can see here
# grep . /sys/class/dmi/id/*
/sys/class/dmi/id/bios_date:04/05/2014
/sys/class/dmi/id/bios_vendor:coreboot
/sys/class/dmi/id/bios_version:SageBios_PCEngines_APU-45
/sys/class/dmi/id/chassis_type:3
/sys/class/dmi/id/chassis_vendor:PC Engines
/sys/class/dmi/id/modalias:dmi:bvncoreboot:bvrSageBios_PCEngines_APU-45:bd04/05/2014:svnPCEngines:pnAPU:pvr1.0:cvnPCEngines:ct3:cvr:
/sys/class/dmi/id/product_family:None Provided
/sys/class/dmi/id/product_name:APU
/sys/class/dmi/id/product_serial:XXXXXXX
/sys/class/dmi/id/product_version:1.0
/sys/class/dmi/id/sys_vendor:PC Engines
/sys/class/dmi/id/uevent:MODALIAS=dmi:bvncoreboot:bvrSageBios_PCEngines_APU-45:bd04/05/2014:svnPCEngines:pnAPU:pvr1.0:cvnPCEngines:ct3:cvr:

there is no board name on APU.

here is the output from my APU2 board
# grep . /sys/class/dmi/id/*
/sys/class/dmi/id/bios_date:02/28/2017
/sys/class/dmi/id/bios_vendor:coreboot
/sys/class/dmi/id/bios_version:4.0.7
/sys/class/dmi/id/board_name:APU2
/sys/class/dmi/id/board_serial:XXXXXXX
/sys/class/dmi/id/board_vendor:PC Engines
/sys/class/dmi/id/board_version:1.0
/sys/class/dmi/id/chassis_type:3
/sys/class/dmi/id/chassis_vendor:PC Engines
/sys/class/dmi/id/modalias:dmi:bvncoreboot:bvr4.0.7:bd02/28/2017:svnPCEngines:pnAPU2:pvr1.0:rvnPCEngines:rnAPU2:rvr1.0:cvnPCEngines:ct3:cvr:
/sys/class/dmi/id/product_name:APU2
/sys/class/dmi/id/product_serial:XXXXXX
/sys/class/dmi/id/product_version:1.0
/sys/class/dmi/id/sys_vendor:PC Engines
/sys/class/dmi/id/uevent:MODALIAS=dmi:bvncoreboot:bvr4.0.7:bd02/28/2017:svnPCEngines:pnAPU2:pvr1.0:rvnPCEngines:rnAPU2:rvr1.0:cvnPCEngines:ct3:cvr:

As you can see here for APU2 the board_name is set.

> 
> If it fails here, then how it is possible that it succeeds
> in the apu_led_init() ?
> 

in apu_led_init() is a check for product_name for both both boards.
Ans this succeeds

Thus the fix here
> -     if (dmi_match(DMI_BOARD_NAME, "APU")) {
> +     if (dmi_match(DMI_PRODUCT_NAME, "APU")) {

I can rewrite the patch to catch both board_name and product_name for the 
APU board, and add a better commit log.

They are more recent bios updates for this board, but the are specified as 
"beta" so I'm afraid of an update. I have no hardware to recover a 
"damaged" SPI flash chip.

Greetings
Hans Ulli Kroll