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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2014-08-18 22:16:00 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-09-03 11:04:03 +0200 |
| commit | 72c3500ac4c260df661906dd6da484b35d149985 (patch) | |
| tree | 0ed2fd2bac2023a1c7740773cfd9d837cb635f53 /drivers/gpu/drm/i915/intel_dp.c | |
| parent | 1e0560e05db2830f61465ce98b995564d33dfbcc (diff) | |
| download | op-kernel-dev-72c3500ac4c260df661906dd6da484b35d149985.zip op-kernel-dev-72c3500ac4c260df661906dd6da484b35d149985.tar.gz | |
drm/i915: Add a note explaining vdd on/off handling in intel_dp_aux_ch()
Add a comment to explain why we care about the current want_panel_vdd
state in intel_dp_aux_ch().
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 190e617..a45069b 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -533,6 +533,12 @@ intel_dp_aux_ch(struct intel_dp *intel_dp, bool has_aux_irq = HAS_AUX_IRQ(dev); bool vdd; + /* + * We will be called with VDD already enabled for dpcd/edid/oui reads. + * In such cases we want to leave VDD enabled and it's up to upper layers + * to turn it off. But for eg. i2c-dev access we need to turn it on/off + * ourselves. + */ vdd = edp_panel_vdd_on(intel_dp); /* dp aux is extremely sensitive to irq latency, hence request the |
