APPLIED[Artful]: [PATCH][OEM][Artful][8086:3e92] display becomes blank after S3

[Kleber Souza]

On 03/28/18 05:20, AceLan Kao wrote:
> BugLink: https://launchpad.net/bugs/1759188
> 
> [Impact]
> The display becomes blank after S3 with the following error messages.
> 
> [ 38.304449] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
> [ 38.304462] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry
> [ 38.306726] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
> [ 38.306733] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpd
> [ 38.311251] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
> [ 38.313538] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode adaptor ID: 44 (err 0)
> [ 38.313554] [drm:intel_hdmi_set_edid [i915]] DP dual mode adaptor (type 1 HDMI) detected (max TMDS clock: 165000 kHz)
> [ 38.313557] [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:115:HDMI-A-1] status updated from disconnected to disconnected
> 
> [Fix]
> This commit pointed out by Timo fixes the issue.
> 
> [Regression Potential]
> Should be low, although the change applies broadly.
> From the patch description, it explains why it should be safe.
>> This workaround was designed to minimize the impact only
>> to save the bad case with that link rates. But HW engineers
>> indicated that it should be safe to apply broadly, although
>> they were expecting the DPLL0 link rate to be unchanged on
>> runtime.
> 
> Lucas De Marchi (1):
>   drm/i915: Apply Display WA #1183 on skl, kbl, and cfl
> 
>  drivers/gpu/drm/i915/i915_reg.h         |  2 ++
>  drivers/gpu/drm/i915/intel_cdclk.c      | 35 ++++++++++++++++++++++++---------
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 10 ++++++++++
>  3 files changed, 38 insertions(+), 9 deletions(-)
> 

Applied to artful/master-next branch.

Thanks,
Kleber