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| author | Jani Nikula <jani.nikula@intel.com> | 2023-12-05 20:05:51 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2023-12-11 13:15:35 +0200 |
| commit | e6861d8264cd43c5eb20196e53df36fd71ec5698 (patch) | |
| tree | 8e2b42784689cc9001cd9c4ecebaa8639c4f0930 /scripts/gdb/linux/utils.py | |
| parent | 324b70e997aab0a7deab8cb90711faccda4e98c8 (diff) | |
drm/i915/edp: don't write to DP_LINK_BW_SET when using rate select
The eDP 1.5 spec adds a clarification for eDP 1.4x:
> For eDP v1.4x, if the Source device chooses the Main-Link rate by way
> of DPCD 00100h, the Sink device shall ignore DPCD 00115h[2:0].
We write 0 to DP_LINK_BW_SET (DPCD 100h) even when using
DP_LINK_RATE_SET (DPCD 114h). Stop doing that, as it can cause the panel
to ignore the rate set method.
Moreover, 0 is a reserved value for DP_LINK_BW_SET, and should not be
used.
v2: Improve the comments (Ville)
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9081
Tested-by: Animesh Manna <animesh.manna@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231205180551.2476228-1-jani.nikula@intel.com
(cherry picked from commit 23b392b94acb0499f69706c5808c099f590ebcf4)
Cc: stable@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'scripts/gdb/linux/utils.py')
0 files changed, 0 insertions, 0 deletions