Hi,
On Tue, Apr 2, 2019 at 4:38 AM Heiko Stuebner <heiko@xxxxxxxxx> wrote:
>
> From: Vicente Bergas <vicencb@xxxxxxxxx>
>
> 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@xxxxxxxxxxxxxx>
> Cc: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
> Cc: Brian Norris <briannorris@xxxxxxxxxxxx>
> Cc: Doug Anderson <dianders@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Suggested-by: JeffyChen <jeffy.chen@xxxxxxxxxxxxxx>
> Suggested-by: Robin Murphy <robin.murphy@xxxxxxx>
> Signed-off-by: Vicente Bergas <vicencb@xxxxxxxxx>
> [adapted commit message to explain the history]
> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
> ---
> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
I picked this back to the Chrome OS 4.19 kernel and tried it on
rk3288-veyron-jerry. Rebooting caused no complaints (I confirmed this
code was running by adding a printk).
I plugged in to an HDMI monitor. Rebooting caused no complaints.
I then let the display idle off (just in case that mattered). Again
no complaints.
Thus, in case it's helpful:
Tested-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
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