[PATCH 0/1][SRU][F/OEM-5.6]drm/i915/dp_mst - System would hang during the boot up

[Koba Ko]

On Tue, Nov 3, 2020 at 7:09 AM Alex Murray <alex.murray at canonical.com>
wrote:

>
> On Mon, 2020-11-02 at 21:58:24 +1030, Stefan Bader wrote:
>
> > On 02.11.20 06:46, Koba Ko wrote:
> >> BugLink: https://bugs.launchpad.net/bugs/1902469
> >>
> >> [Impact]
> >> The machine connect with the external monitor on dock(Thunderbolt),
> >> Then system would hang during the boot-up.
> >>
> >> [Fix]
> >> The atomic check hooks must look up the encoder to be used with a
> >> connector from the connector's atomic state, and not assume that it's
> >> the connector's current attached encoder. The latter one can change
> >> under the atomic check func, or can be unset yet as in the case of MST
> >> connectors.
> >>
> >> [test]
> >> With the patch, The machine connect with the external monitor on
> dock(Thunderbolt),
> >> Then system boot up successfully.
> >>
> >> [Regression Potential]
> >> Low. This patch is also verified by others and is archived in the
> drmtip.
> >>
> >> Imre Deak (1):
> >>   drm/i915: Fix encoder lookup during PSR atomic check
> >>
> >>  drivers/gpu/drm/i915/display/intel_psr.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> > Is this focal/oem-5.6 only? The bug report points at focal/linux.
>
> There are also similar reports for groovy -
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901215 - and I can
> confirm this patch resolves that bug there too - can this patch be
> targeted to groovy as well?
>
> >
> > -Stefan
>
> Sure, have target to groovy. Should I SRU  again!?
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