[Nouveau] v4.12 backport request: 13a86519202 (drm/nouveau/i2c/gf119-: add support for address-only transactions)

Greg KH greg at kroah.com
Mon Sep 4 11:19:18 UTC 2017

On Sun, Sep 03, 2017 at 11:46:57AM -0400, Ilia Mirkin wrote:
> Commit df8dc97cd17 (drm/nouveau/kms/nv50: use drm core i2c-over-aux
> algorithm) switched things over to the drm algo. Unfortunately it
> generates address-only transactions. Prior to GF119, the hardware had
> no support for such things, and GF119+ the nouveau code did not handle
> these properly.
> The result of this bug is that EDID doesn't make it over for DP (and
> eDP) screens, which in turn wreaks all sorts of havoc. There have been
> lots of reports on IRC, a few on mailing lists, and also:
> https://bugs.freedesktop.org/show_bug.cgi?id=102528
> Commit 13a86519202 (drm/nouveau/i2c/gf119-: add support for
> address-only transactions) fixes the nouveau support for such
> transactions on GF119+ and flips things back over to the custom algo
> for earlier chips. Please include into the next v4.12.x release:

Now queued up, thanks.

greg k-h

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