[Intel-gfx] [v5.0 stable PATCH] drm/i915/dp: revert back to max link rate and lane count on eDP

[Greg KH]

On Mon, Apr 15, 2019 at 03:58:37PM +0300, Jani Nikula wrote:
> commit 21635d7311734d2d1b177f8a95e2f9386174b76d upstream.
> 
> Commit 7769db588384 ("drm/i915/dp: optimize eDP 1.4+ link config fast
> and narrow") started to optize the eDP 1.4+ link config, both per spec
> and as preparation for display stream compression support.
> 
> Sadly, we again face panels that flat out fail with parameters they
> claim to support. Revert, and go back to the drawing board.
> 
> v2: Actually revert to max params instead of just wide-and-slow.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109959
> Fixes: 7769db588384 ("drm/i915/dp: optimize eDP 1.4+ link config fast and narrow")
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Matt Atwood <matthew.s.atwood at intel.com>
> Cc: "Lee, Shawn C" <shawn.c.lee at intel.com>
> Cc: Dave Airlie <airlied at gmail.com>
> Cc: intel-gfx at lists.freedesktop.org
> Cc: <stable at vger.kernel.org> # v5.0+
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Reviewed-by: Manasi Navare <manasi.d.navare at intel.com>
> Tested-by: Albert Astals Cid <aacid at kde.org> # v5.0 backport
> Tested-by: Emanuele Panigati <ilpanich at gmail.com> # v5.0 backport
> Tested-by: Matteo Iervasi <matteoiervasi at gmail.com> # v5.0 backport
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20190405075220.9815-1-jani.nikula@intel.com
> (cherry picked from commit f11cb1c19ad0563b3c1ea5eb16a6bac0e401f428)
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 69 +++++----------------------------
>  1 file changed, 10 insertions(+), 59 deletions(-)

Now queued up, thanks.

greg k-h