f6f30065b430ef670e5a163577634941c20f8855 is the first bad commit
commit f6f30065b430ef670e5a163577634941c20f8855
Author: Ville Syrj�l� <[email protected]>
Date: Thu May 6 17:44:00 2021 +0200
drm/i915: Try to use fast+narrow link on eDP again and fall back to the old
max strategy on failure
BugLink: https://bugs.launchpad.net/bugs/1925685
Some new eDP panels don't like to operate at the max parameters, and
instead we need to go for an optimal confiugration. That unfortunately
doesn't work with older eDP panels which are generally only guaranteed
to work at the max parameters.
To solve these two conflicting requirements let's start with the optimal
setup, and if that fails we start again with the max parameters. The
downside is probably an extra modeset when we switch strategies but
I don't see a good way to avoid that.
For a bit of history we first tried to go for the fast+narrow in
commit 7769db588384 ("drm/i915/dp: optimize eDP 1.4+ link config
fast and narrow"). but that had to be reverted due to regression
on older panels in commit f11cb1c19ad0 ("drm/i915/dp: revert back
to max link rate and lane count on eDP"). So now we try to get
the best of both worlds by using both strategies.
v2: Deal with output_bpp and uapi vs. hw state split
Reword some comments
v3: Rebase
Cc: Jani Nikula <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Albert Astals Cid <[email protected]> # v5.0 backport
Cc: Emanuele Panigati <[email protected]> # v5.0 backport
Cc: Matteo Iervasi <[email protected]> # v5.0 backport
Cc: Timo Aaltonen <[email protected]>
Cc: Kai-Heng Feng <[email protected]>
Reviewed-by: Manasi Navare <[email protected]>
References: https://bugs.freedesktop.org/show_bug.cgi?id=105267
References: https://bugs.freedesktop.org/show_bug.cgi?id=109959
References: https://gitlab.freedesktop.org/drm/intel/issues/272
Signed-off-by: Ville Syrj�l� <[email protected]>
Link:
https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 2bbd6dba84d44219387df051a1c799b7bac46099)
Signed-off-by: Kai-Heng Feng <[email protected]>
Acked-by: Tim Gardner <[email protected]>
Acked-by: Stefan Bader <[email protected]>
Signed-off-by: Kleber Sacilotto de Souza <[email protected]>
drivers/gpu/drm/i915/display/intel_display_types.h | 1 +
drivers/gpu/drm/i915/display/intel_dp.c | 75 +++++++++++++++++++---
2 files changed, 67 insertions(+), 9 deletions(-)
** Bug watch added: freedesktop.org Bugzilla #105267
https://bugs.freedesktop.org/show_bug.cgi?id=105267
** Bug watch added: freedesktop.org Bugzilla #109959
https://bugs.freedesktop.org/show_bug.cgi?id=109959
** Bug watch added: gitlab.freedesktop.org/drm/intel/issues #272
https://gitlab.freedesktop.org/drm/intel/issues/272
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