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From:   Heiko Stuebner <heiko@sntech.de>
To:     hjc@rock-chips.com
Cc:     dri-devel@lists.freedesktop.org,
        linux-rockchip@lists.infradead.org,
        Vicente Bergas <vicencb@gmail.com>,
        Jeffy Chen <jeffy.chen@rock-chips.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Brian Norris <briannorris@chromium.org>,
        Doug Anderson <dianders@chromium.org>, stable@vger.kernel.org
Subject: Re: [PATCH v2] drm/rockchip: shutdown drm subsystem on shutdown
Date:   Thu, 18 Apr 2019 10:32:52 +0200
Message-ID: <16214989.ofMSVjYgR7@phil>
In-Reply-To: <20190402113753.10118-1-heiko@sntech.de>
References: <20190402113753.10118-1-heiko@sntech.de>
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Am Dienstag, 2. April 2019, 13:37:53 CEST schrieb Heiko Stuebner:
> From: Vicente Bergas <vicencb@gmail.com>
> 
> As explained by Robin Murphy:
> > the IOMMU shutdown disables paging, so if the VOP is still
> > scanning out then that will result in whatever IOVAs it was using now going
> > straight out onto the bus as physical addresses.
> 
> We had a more radical approach before in commit
> 7f3ef5dedb14 ("drm/rockchip: Allow driver to be shutdown on reboot/kexec")
> but that resulted in new warnings and oopses on shutdown on rk3399
> chromeos devices.
> 
> So second try is resurrecting Vicentes shutdown change which should
> achieve the same result but in a less drastic way.
> 
> Fixes: 63238173b2fa ("Revert drm/rockchip: Allow driver to be shutdown on reboot/kexec")
> Cc: Jeffy Chen <jeffy.chen@rock-chips.com>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Brian Norris <briannorris@chromium.org>
> Cc: Doug Anderson <dianders@chromium.org>
> Cc: stable@vger.kernel.org
> Suggested-by: JeffyChen <jeffy.chen@rock-chips.com>
> Suggested-by: Robin Murphy <robin.murphy@arm.com>
> Signed-off-by: Vicente Bergas <vicencb@gmail.com>
> [adapted commit message to explain the history]
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>

applied to drm-misc-next

Not fixes, to give it more exposure this time. It still has a stable tag
so should nevertheless trickle down to stable in time as well.

Thanks for all the testing
Heiko