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

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Date:	Wed, 18 Feb 2015 20:04:03 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.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

On Wednesday 18 February 2015 17:33:53 Tony Lindgren wrote:
> * 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

Yes, I can send proper git format-patch, but first let me know if 
that change does not break your HW...

-- 
Pali Rohár
pali.rohar@...il.com

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