linux-kernel - Re: [BUG] [PATCH] drm/rockchip: use generic fbdev setup

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Date:   Mon, 17 Oct 2022 13:29:11 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Johan Jonker <jbx6244@...il.com>, John Keeping <john@...anate.com>
Cc:     dri-devel@...ts.freedesktop.org, Sandy Huang <hjc@...k-chips.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [BUG] [PATCH] drm/rockchip: use generic fbdev setup

Am Montag, 17. Oktober 2022, 12:05:16 CEST schrieb John Keeping:
> Hi Johan,
> 
> On Mon, Oct 17, 2022 at 10:11:32AM +0200, Johan Jonker wrote:
> > Your patch contribution causes a kernel panic on MK808 with Rockchip rk3066a SoC.
> > Would you like to contribute to fix this issue?
> > The assumtion that drm_fbdev_generic_setup() does what rockchip_drm_fbdev_init did is not true!
> > A revert makes it work again.
> 
> It looks like there are 3 different ways to end up with -ENOMEM here,
> can you track down whether you're hitting one of the cases in
> rockchip_gem_prime_vmap() or if it's the iosys_map_is_null case in
> drm_gem_vmap()?
> 
> I guess the memory usage increases slightly using the generic code and
> RK3066 has less memory available.

also rk3066 and rk3188 do not have an iommu, so rely
on cma allocations.


Heiko