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. Signed-off-by: Eugeni Dodonov <[email protected]> --- drivers/gpu/drm/i915/intel_display.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 758173d..ea1ac15 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -2631,6 +2631,18 @@ 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)) { + if (HAS_PCH_LPT(dev) && (encoder->type == DRM_MODE_ENCODER_DAC)) + 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)) -- 1.7.10 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
