drm/i915 Avoid long delays when reading EDID on eDP
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- v1 Latest5 patches 5 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/5 | drm/i915: Try to avoid pps_{lock, unlock}() on DP portsdrivers/ | +28 | 1 reply | |
| 2/5 | drm/DP: Create pointer to generic DPCD access functiondrivers/ include/ | +11 | 0 replies | |
| 3/5 | drm/DP: Export drm_dp_i2c_xfer() DP helper functiondrivers/ include/ | +4 | 0 replies | |
| 4/5 | drm/DP: Export drm_dp_dpcd_access() DP helper functiondrivers/ include/ | +6 | 0 replies | |
| 5/5 | drm/i915/eDP: Move pps_lock() and edp_panel_vdd_on() to topdrivers/ drivers/ | +100 | 0 replies |
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Cover letter [PATCH 0/5] drm/i915 Avoid long delays when reading EDID on eDP
For eDP in the Intel driver pps_lock()/unlock() need to be called before initiating an I2C/AUX channel transfer. These operations can be quite expensive - especially on values for HZ lower than 1000.
It is therefore better to perfrom this locking/unlocking only once, ie at the beginning and at the end of the entire I2C transfer. The current design of drm_dp_helper.c doesn't allow this. This patchset modifies drm_dp_helper.c and moves the locking/unlocking operation to the top.
This fixes the long delay observed in
https://bugs.freedesktop.org/show_bug.cgi?id=86201
Egbert Eich (4):
drm/DP: Create pointer to generic DPCD access function drm/DP: Export drm_dp_i2c_xfer() DP helper function drm/DP: Export drm_dp_dpcd_access() DP helper function drm/i915/eDP: Move pps_lock() and edp_panel_vdd_on() to top
Ville Syrjälä (1):
drm/i915: Try to avoid pps_{lock,unlock}() on DP ports
drivers/gpu/drm/drm_dp_helper.c | 11 ++-- drivers/gpu/drm/i915/intel_dp.c | 132 +++++++++++++++++++++++++++++++-------- drivers/gpu/drm/i915/intel_drv.h | 5 ++ include/drm/drm_dp_helper.h | 14 +++++ 4 files changed, 133 insertions(+), 29 deletions(-)
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