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[0/3,SRU,OEM-5.6] Get the extended DPCD according to the related field in the DPCD registers

Message ID 20200916065122.1776-1-koba.ko@canonical.com
Headers show
Series Get the extended DPCD according to the related field in the DPCD registers | expand

Message

Koba Ko Sept. 16, 2020, 6:51 a.m. UTC 
BugLink: https://bugs.launchpad.net/bugs/1893752

[Impact]
Connect the 4K@60Hz monitor on WD19, the monitor can't light.

[Fix]
As per DP spec, at first check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT.               
If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1, read the DP_DP13_DPCD_REV to 
get the faster capability. 
If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0, read DP_DPCD_REV. 

[Test]
With the patches, connect 4K@60Hz monitor on WD19, 
the machine can output the video to the monitor and the monitor can light.

[Regression]
low, Just get one more DPCD from the extended register, 
compare them and get the faster one.

Koba Ko (1):
  drm/dp_mst: Retrieve extended DPCD caps for topology manager

Lyude Paul (1):
  drm/i915/dp: Extract drm_dp_read_dpcd_caps()

Oleg Vasilev (1):
  drm: move DP_MAX_DOWNSTREAM_PORTS from i915 to drm core

 drivers/gpu/drm/drm_dp_helper.c               | 187 ++++++++++++++++++
 drivers/gpu/drm/drm_dp_mst_topology.c         |   6 +-
 .../drm/i915/display/intel_display_types.h    |   2 -
 drivers/gpu/drm/i915/display/intel_dp.c       |  56 +-----
 drivers/gpu/drm/i915/display/intel_dp.h       |   1 -
 drivers/gpu/drm/i915/display/intel_lspcon.c   |   2 +-
 include/drm/drm_dp_helper.h                   |   5 +
 7 files changed, 200 insertions(+), 59 deletions(-)

Comments

Timo Aaltonen Sept. 22, 2020, 11:48 a.m. UTC | #1 
On 16.9.2020 9.51, Koba Ko wrote:
> BugLink: https://bugs.launchpad.net/bugs/1893752
> 
> [Impact]
> Connect the 4K@60Hz monitor on WD19, the monitor can't light.
> 
> [Fix]
> As per DP spec, at first check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT.               
> If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1, read the DP_DP13_DPCD_REV to 
> get the faster capability. 
> If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0, read DP_DPCD_REV. 
> 
> [Test]
> With the patches, connect 4K@60Hz monitor on WD19, 
> the machine can output the video to the monitor and the monitor can light.
> 
> [Regression]
> low, Just get one more DPCD from the extended register, 
> compare them and get the faster one.
> 
> Koba Ko (1):
>   drm/dp_mst: Retrieve extended DPCD caps for topology manager
> 
> Lyude Paul (1):
>   drm/i915/dp: Extract drm_dp_read_dpcd_caps()
> 
> Oleg Vasilev (1):
>   drm: move DP_MAX_DOWNSTREAM_PORTS from i915 to drm core
> 
>  drivers/gpu/drm/drm_dp_helper.c               | 187 ++++++++++++++++++
>  drivers/gpu/drm/drm_dp_mst_topology.c         |   6 +-
>  .../drm/i915/display/intel_display_types.h    |   2 -
>  drivers/gpu/drm/i915/display/intel_dp.c       |  56 +-----
>  drivers/gpu/drm/i915/display/intel_dp.h       |   1 -
>  drivers/gpu/drm/i915/display/intel_lspcon.c   |   2 +-
>  include/drm/drm_dp_helper.h                   |   5 +
>  7 files changed, 200 insertions(+), 59 deletions(-)
> 

applied to oem-5.6 after seeing that patch 3 was sent as a new revision
to dri-devel@.