[v6,0/2] drm: Add detection of changing of edid on between suspend and resume

Message

Gwan-gyeong Mun April 12, 2019, 2:06 p.m. UTC

This patch series fix missed detection of changing of edid on between
suspend and resume.
First patch fixes drm_helper_hdp_irq_event() in order to fix a below use
case.

 Following scenario requires detection of changing of edid.
    
  1) plug display device to a connector
  2) system suspend
  3) unplug 1)'s display device and plug the other display device to a
     connector
  4) system resume

It adds edid check routine when a connector status still remains as
"connector_status_connected".

Second patch adds a missed update of edid property of drm connector on i915.
  
v2: Add NULL check before comparing of EDIDs.
v3: Make it as part of existing drm_helper_hpd_irq_event() (Stan, Mika)
v4: Rebased
v5: Use a cached edid property blob data of connector instead of adding
    a new detected_edid variable. (Maarten)
    Add an using of reference count for getting a cached edid property
    blob data. (Maarten)
v6: Fixes coding style

Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate
Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend
Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate
Testcase: igt/kms_chamelium/dp-edid-change-during-suspend

v1, v2: https://patchwork.freedesktop.org/series/47680/
v3: https://patchwork.freedesktop.org/series/49298/
v4: https://patchwork.freedesktop.org/series/57397/

Gwan-gyeong Mun (2):
  drm: Add detection of changing of edid on between suspend and resume
  drm/i915: Add a missed update of edid property of drm connector

 drivers/gpu/drm/drm_probe_helper.c | 34 +++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_dp.c    |  1 +
 drivers/gpu/drm/i915/intel_hdmi.c  |  1 +
 3 files changed, 35 insertions(+), 1 deletion(-)