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| author | Kai-Heng Feng <kai.heng.feng@canonical.com> | 2021-08-20 09:52:59 +0200 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2021-08-20 19:22:29 +0200 |
| commit | d7f213c131adf0bec8b731553eb82990cdac265d (patch) | |
| tree | 72a5cf03eae4999ab1607be87a00d47440c00dea /include/drm | |
| parent | drm/i915/fbc: Polish the skl+ FBC stride override handling (diff) | |
| download | linux-d7f213c131adf0bec8b731553eb82990cdac265d.tar.xz linux-d7f213c131adf0bec8b731553eb82990cdac265d.zip | |
drm/i915/dp: Use max params for panels < eDP 1.4
Users reported that after commit 2bbd6dba84d4 ("drm/i915: Try to use
fast+narrow link on eDP again and fall back to the old max strategy on
failure"), the screen starts to have wobbly effect.
Commit a5c936add6a2 ("drm/i915/dp: Use slow and wide link training for
everything") doesn't help either, that means the affected eDP 1.2 panels
only work with max params.
So use max params for panels < eDP 1.4 as Windows does to solve the
issue.
v3:
- Do the eDP rev check in intel_edp_init_dpcd()
v2:
- Check eDP 1.4 instead of DPCD 1.1 to apply max params
Cc: stable@vger.kernel.org
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3714
Fixes: 2bbd6dba84d4 ("drm/i915: Try to use fast+narrow link on eDP again and fall back to the old max strategy on failure")
Fixes: a5c936add6a2 ("drm/i915/dp: Use slow and wide link training for everything")
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210820075301.693099-1-kai.heng.feng@canonical.com
Diffstat (limited to 'include/drm')
0 files changed, 0 insertions, 0 deletions