diff options
| author | Imre Deak <imre.deak@intel.com> | 2016-11-21 21:15:06 +0200 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2016-11-23 13:32:01 +0200 |
| commit | 357c0ae9198ad7f526f229c4f33921e8e3a3e9a0 (patch) | |
| tree | 9266b64f1f7182c060f0569ad8d136f09359a03b /drivers/gpu/drm/i915/intel_drv.h | |
| parent | dd75f6dd2e7d5de544e8aa8b75d1e50308cd8561 (diff) | |
drm/i915/lspcon: Wait for expected LSPCON mode to settle
Some LSPCON adaptors may return an incorrect LSPCON mode right after
waking from DP Sleep state. This is the case at least for the ParadTech
PS175 adaptor, both when waking because of exiting the DP Sleep to
active state, or due to any other AUX CH transfer. We can determine the
current expected mode based on whether the DPCD area is accessible,
since according to the LSPCON spec this area is only accesible
in PCON mode.
This wait will avoid us trying to change the mode, while the current
expected mode hasn't settled yet and start link training before the
adaptor thinks it's in PCON mode after waking from DP Sleep state.
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479755707-29596-4-git-send-email-imre.deak@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_drv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index cf47e8a6c2fb..d16590481ce4 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1830,4 +1830,5 @@ void intel_color_load_luts(struct drm_crtc_state *crtc_state); /* intel_lspcon.c */ bool lspcon_init(struct intel_digital_port *intel_dig_port); void lspcon_resume(struct intel_lspcon *lspcon); +void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon); #endif /* __INTEL_DRV_H__ */ |