On Wed, May 09, 2012 at 03:37:15PM -0300, Eugeni Dodonov wrote:
> 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.
>
> Signed-off-by: Eugeni Dodonov <eugeni.dodo...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index f809d6a..96933cc 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)) {
> + if (encoder->type == DRM_MODE_ENCODER_DAC) {
> + /* It is still unclear how this would work on
> PPT, so throw up an error */
> + if (!HAS_PCH_LPT(dev))
> + DRM_ERROR("DAC detected on a non-LPT
> PCH, this probably won't work\n");
Hm, I guess we should move the LPT check out of the DAC check - after all
we could drive a DP output through FDI on a PPT. Or maybe not, which
implies that we have no clue in either case ;-)
-Daniel
> +
> + 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
>
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Mail: dan...@ffwll.ch
Mobile: +41 (0)79 365 57 48
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