2015-12-01 11:08 GMT-02:00 <ville.syrjala@xxxxxxxxxxxxxxx>:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Currently we disable some parts of FDI setup after a failed link
> training. But despite that we continue with the modeset as if everything
> is fine. This results in tons of noise from the state checker, and
> it means we're not following the proper modeset sequence for the rest of
> crtc enabling, nor for crtc disabling.
>
> Ideally we should abort the modeset and follow the proper disable
> suquenced to shut off everything we enabled so far, but that would
> require a big rework of the modeset code. So instead just leave FDI
> up and running in its untrained state, and log an error. This is
> what we do on older platforms too.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_ddi.c | 24 +++++++++++++++---------
> 1 file changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 76ce7c2960b6..b312a47a0654 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -675,15 +675,16 @@ void hsw_fdi_link_train(struct drm_crtc *crtc)
> temp = I915_READ(DP_TP_STATUS(PORT_E));
> if (temp & DP_TP_STATUS_AUTOTRAIN_DONE) {
> DRM_DEBUG_KMS("FDI link training done on step %d\n", i);
> + break;
> + }
>
> - /* Enable normal pixel sending for FDI */
> - I915_WRITE(DP_TP_CTL(PORT_E),
> - DP_TP_CTL_FDI_AUTOTRAIN |
> - DP_TP_CTL_LINK_TRAIN_NORMAL |
> - DP_TP_CTL_ENHANCED_FRAME_ENABLE |
> - DP_TP_CTL_ENABLE);
> -
> - return;
> + /*
> + * Leave things enabled even if we failed to train FDI.
> + * Results in less fireworks from the state checker.
> + */
> + if (i == ARRAY_SIZE(hsw_ddi_translations_fdi) * 2 - 1) {
> + DRM_ERROR("FDI link training failed!\n");
> + break;
> }
>
> temp = I915_READ(DDI_BUF_CTL(PORT_E));
> @@ -712,7 +713,12 @@ void hsw_fdi_link_train(struct drm_crtc *crtc)
> POSTING_READ(FDI_RX_MISC(PIPE_A));
> }
>
> - DRM_ERROR("FDI link training failed!\n");
> + /* Enable normal pixel sending for FDI */
> + I915_WRITE(DP_TP_CTL(PORT_E),
> + DP_TP_CTL_FDI_AUTOTRAIN |
> + DP_TP_CTL_LINK_TRAIN_NORMAL |
> + DP_TP_CTL_ENHANCED_FRAME_ENABLE |
> + DP_TP_CTL_ENABLE);
> }
>
> void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder)
> --
> 2.4.10
>
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--
Paulo Zanoni
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