linux-kernel - Re: [PATCH 3/3] drm: omapdrm: Do no allocate non-scanout GEMs through DMM/TILER

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Message-ID: <Y1+f0zG50ZR4aWGX@atomide.com>
Date:   Mon, 31 Oct 2022 12:13:39 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>, tomba@...nel.org,
        airlied@...ux.ie, daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        merlijn@...zup.org
Subject: Re: [PATCH 3/3] drm: omapdrm: Do no allocate non-scanout GEMs
 through DMM/TILER

* Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com> [221031 06:55]:
> On 31.10.22 г. 0:08 ч., H. Nikolaus Schaller wrote:
> > [   39.419846] WARNING: CPU: 0 PID: 3673 at drivers/bus/omap_l3_noc.c:139 l3_interrupt_handler+0x23c/0x330
> > [   39.429914] 44000000.l3-noc:L3 Custom Error: MASTER MPU TARGET GPMC (Idle): Data Access in Supervisor mode during Functional access
> > ...
> > 
> 
> I have no idea what that error is supposed to mean. @Tony?

The error above is GPMC related. It means GPMC is not properly clocked or powered
while trying to access it's IO range.

Maybe DSS is somehow trying to access GPMC address space registers with DMA? The
GPMC address space starts at 0. Maybe the DSS DMA address is 0 somwhere?

Regards,

Tony