linux-kernel - Re: [PATCH] ARM: dts: Revert disabling of smc91x for n900

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Message-ID: <20150218163352.GB32521@atomide.com>
Date:	Wed, 18 Feb 2015 08:33:53 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	linux-omap@...r.kernel.org, Kevin Hilman <khilman@...nel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Nishanth Menon <nm@...com>
Subject: Re: [PATCH] ARM: dts: Revert disabling of smc91x for n900

* Pali Rohár <pali.rohar@...il.com> [150218 07:23]:
> On Tuesday 06 January 2015 00:02:29 Tony Lindgren wrote:
> > Revert "ARM: dts: Disable smc91x on n900 until bootloader
> > dependency is removed". We've now fixed the issues that
> > caused problems with uninitialized hardware depending on
> > the bootloader version. Mostly things got fixed with
> > the following commits:
> > 
> > 9a894953a97b ("ARM: dts: Fix bootloader version dependencies
> > by muxing n900 smc91x pins") 7d2911c43815 ("net: smc91x: Fix
> > gpios for device tree based booting")
> > 
> > Note that this only affects the early development boards
> > with Ethernet that we still have in a few automated boot
> > test systems.
> > 
> > Signed-off-by: Tony Lindgren <tony@...mide.com>
> > 
> > --- a/arch/arm/boot/dts/omap3-n900.dts
> > +++ b/arch/arm/boot/dts/omap3-n900.dts
> > @@ -702,9 +702,6 @@
> > 
> >  	ethernet@...c {
> >  		compatible = "smsc,lan91c94";
> > -
> > -		status = "disabled";
> > -
> >  		interrupt-parent = <&gpio2>;
> >  		interrupts = <22 IRQ_TYPE_LEVEL_HIGH>;	/* gpio54 */
> >  		reg = <1 0x300 0xf>;		/* 16 byte IO range at offset 0x300
> > */
> 
> Hello Tony,
> 
> to make smc ethernet working in n900 qemu I needed to apply this patch:
> 
> diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> index ff36fbe..d96eeb8 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -770,7 +770,8 @@
>  		compatible = "smsc,lan91c94";
>  		interrupt-parent = <&gpio2>;
>  		interrupts = <22 IRQ_TYPE_LEVEL_HIGH>;	/* gpio54 */
> -		reg = <1 0x300 0xf>;		/* 16 byte IO range at offset 0x300 */
> +//		reg = <1 0x300 0xf>;		/* 16 byte IO range at offset 0x300 */
> +		reg = <1 0x0 0xf>;		/* 16 byte IO range at offset 0x300 */
>  		bank-width = <2>;
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&ethernet_pins>;

Oh cool, the 0x300 offset is there mostly to suppress warnings about
non-standard location.
 
> With this patch I see in dmesg:
> 
> [   20.577911] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: smc_probe
> [   20.580535] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: bank signature probe 
> returned 0x3300
> [   20.585327] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: revision = 0x3391
> [   20.590087] smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <nico@...xnic.net>
> [   20.593627] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc_reset
> [   20.596832] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc_phy_detect
> [   20.611938] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: smc_shutdown
> [   20.615875] smc91x 2000000.ethernet eth0: SMC91C11xFD (rev 1) at d08be000 IRQ 166
> [   20.618682] 
> [   20.621124] smc91x 2000000.ethernet eth0: Ethernet addr: 52:54:00:12:34:56
> [   20.624938] smc91x 2000000.ethernet eth0: No PHY found
> 
> (and eth0 exists in ifconfig)
> 
> If I do not apply my patch I got this error message:
> 
> [   22.134704] smc91x 2000300.ethernet (unnamed net_device) (uninitialized): smc91x: bank signature probe 
> returned 0x0000
> [   22.140014] smc91x: not found (-19).
> 
> and no ethernet device was registered.
> 
> With 2.6.28 kernel with N900 patches (but smc91x is unmodified!) ethernet device is working fine.

OK that's good news. Care to do a patch to set the offset 0x0 with added
comment that qemu needs it? I'll test to make sure it works on the
real hardware as well.

Regards,

Tony
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