Re: [PATCH 4.18 222/235] drm/amd/pp: Send khz clock values to DC for smu7/8

[Sasha Levin]

On Mon, Oct 08, 2018 at 02:33:56PM +0000, Deucher, Alexander wrote:
> > -----Original Message-----
> > From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > Sent: Monday, September 24, 2018 7:53 AM
> > To: linux-kernel@xxxxxxxxxxxxxxx
> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>;
> > stable@xxxxxxxxxxxxxxx; Wentland, Harry <Harry.Wentland@xxxxxxx>;
> > Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Zhu, Rex
> > <Rex.Zhu@xxxxxxx>; Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
> > Subject: [PATCH 4.18 222/235] drm/amd/pp: Send khz clock values to DC for
> > smu7/8
> >
> > 4.18-stable review patch.  If anyone has any objections, please let me know.
>
> This regresses power usage on 4.18.  Please revert.
> https://bugzilla.kernel.org/show_bug.cgi?id=201275

Hi Alex,

Thank you for the report.

I'm working on improving this process, I'd be very grateful if you could
answer a few questions about this:

1. Is the same breakage seen upstream? (if so, it should be reverted
there as well and we can grab the revert into -stable).
2. Does the issue reported by this patch ("pipes seem to hang with a 4k
DP and 1080p HDMI display") exist in the 4.18 stable tree?
3. If not, could you briefly explain why?


The algorithm I use was very confident about this patch being stable
material, and when I looked at it back then (and again now) I was very
confident of the same. If I can understand where I was wrong I could
improve my process.

Thank you!