diff options
| author | Eugeni Dodonov <eugeni.dodonov@intel.com> | 2012-05-09 20:30:31 -0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-05-19 22:39:45 +0200 |
| commit | 6ee8bab09d515503f9f1d01690840c2bd5f66267 (patch) | |
| tree | 61183b3d617d651bef2c4d55c5c81ab2c12db9ab | |
| parent | f57e1e3a67503927824839996a6efce269281afa (diff) | |
drm/i915: detect PCH encoders on Haswell
On Haswell, the recommended PCH-connected output is the one driven by DDI
E in FDI mode, used for VGA connection. All the others are handled by the
CPU.
Note that this does not accounts for Haswell/PPT combination yet, so if we
encounter such combination an error message is thrown to indicate that
things could go wrong.
v2: improve non-LPT detection warning per Daniel Vetter's suggestion.
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index cc910e69f709..bb049a178632 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -2610,6 +2610,22 @@ static bool intel_crtc_driving_pch(struct drm_crtc *crtc) if (encoder->base.crtc != crtc) continue; + /* On Haswell, LPT PCH handles the VGA connection via FDI, and Haswell + * CPU handles all others */ + if (IS_HASWELL(dev)) { + /* It is still unclear how this will work on PPT, so throw up a warning */ + WARN_ON(!HAS_PCH_LPT(dev)); + + if (encoder->type == DRM_MODE_ENCODER_DAC) { + DRM_DEBUG_KMS("Haswell detected DAC encoder, assuming is PCH\n"); + return true; + } else { + DRM_DEBUG_KMS("Haswell detected encoder %d, assuming is CPU\n", + encoder->type); + return false; + } + } + switch (encoder->type) { case INTEL_OUTPUT_EDP: if (!intel_encoder_is_pch_edp(&encoder->base)) |