linux-kernel - Re: [PATCHv6 0/4] omapdrm: DSI command mode panel support

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Message-ID: <20190530054640.GQ5447@atomide.com>
Date:   Wed, 29 May 2019 22:46:40 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Tomi Valkeinen <tomi.valkeinen@...com>
Cc:     Sebastian Reichel <sebastian.reichel@...labora.com>,
        Sebastian Reichel <sre@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        dri-devel@...ts.freedesktop.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        Keerthy <j-keerthy@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Subject: Re: [PATCHv6 0/4] omapdrm: DSI command mode panel support

* Tony Lindgren <tony@...mide.com> [190529 08:11]:
> * Tomi Valkeinen <tomi.valkeinen@...com> [190529 07:06]:
> > On 28/05/2019 13:18, Tony Lindgren wrote:
> > 
> > > > My board is x15 rev A3, attached to AM5 EVM. I've also attached my kernel
> > > > config.
> > > 
> > > Strange that this is not affecting other x15? I think timer12 would
> > > be blocked on HS devices though?
> > 
> > Seems that the kernel config affects. omap2plus_defconfig boots ok.
> 
> OK, this line in your oops:
> 
> Unable to handle kernel paging request at virtual address 5a5a5a5a
> 
> Probably means we hit some slab poison with DEBUG_SLAB set.
> Looks like your config boots fine with DEBUG_SLAB disabled
> for me.
> 
> As this only happens for timer12, I wonder if we're again
> hitting some uncompress issue with corrupted dtb. Changing
> u-boot ftdaddr higher up might possibly make it go away.
> Or else there's a bug elsewhere :)

Oh but CM_WKUPAON_TIMER12_CLKCTRL has no CLKSEL option unlike
CM_WKUPAON_TIMER1_CLKCTRL. Below is one part of the fix, but
it seems like we're missing handling somewhere as trying to
get a non-existing clock should just produce -ENODEV type error.

And the clksel should be just handled with assigned-clocks
in general, but I think we still need it there until we
have drivers/clocksource/ timer drivers updated to boot
using early_platform_device.

Regards,

Tony

8< ---------------
diff --git a/arch/arm/boot/dts/dra7-l4.dtsi b/arch/arm/boot/dts/dra7-l4.dtsi
--- a/arch/arm/boot/dts/dra7-l4.dtsi
+++ b/arch/arm/boot/dts/dra7-l4.dtsi
@@ -4450,8 +4450,6 @@
 			timer12: timer@0 {
 				compatible = "ti,omap5430-timer";
 				reg = <0x0 0x80>;
-				clocks = <&wkupaon_clkctrl DRA7_WKUPAON_TIMER12_CLKCTRL 24>;
-				clock-names = "fck";
 				interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
 				ti,timer-alwon;
 				ti,timer-secure;