[Intel-gfx] [PATCH 0/5] drm/i915 Avoid long delays when reading EDID on eDP

[Egbert Eich]

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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1.8.4.5