Re: [PATCH v3 10/11] drm/i915: Enable FIFO underrun reporting after initial fastset, v3.

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Nov 13, 2017 at 01:01:39PM +0100, Maarten Lankhorst wrote:
> Op 10-11-17 om 20:48 schreef Ville Syrjälä:
> > On Fri, Nov 10, 2017 at 12:35:02PM +0100, Maarten Lankhorst wrote:
> >> The firmware may have set up the pipe correctly, but the FIFO
> >> underrun and CRC interrupts are likely not enabled.
> >>
> >> This resulted in debugfs_test.read_all_entries failing on haswell,
> >> because of a timeout when reading the crc debugfs entry.
> >>
> >> Solve this by enabling FIFO underrun reporting after the initial
> >> fastset, which lets interrupts be generated as expected.
> >>
> >> Changes since v1:
> >> - Always enable CPU FIFO underrun reporting for >GEN2,
> >>   and handle GEN2 correctly.
> >> Changes since v2:
> >> - Remove unneeded HAS_DDI, simplify GEN2 case.
> >>
> >> Testcase: debugfs_test.read_all_entries
> >> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/intel_display.c | 11 +++++++++++
> >>  1 file changed, 11 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> >> index 1b75af773ef7..f0dc33fb3390 100644
> >> --- a/drivers/gpu/drm/i915/intel_display.c
> >> +++ b/drivers/gpu/drm/i915/intel_display.c
> >> @@ -12906,6 +12906,7 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc,
> >>  static void intel_finish_crtc_commit(struct drm_crtc *crtc,
> >>  				     struct drm_crtc_state *old_crtc_state)
> >>  {
> >> +	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> >>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> >>  	struct intel_atomic_state *old_intel_state =
> >>  		to_intel_atomic_state(old_crtc_state->state);
> >> @@ -12913,6 +12914,16 @@ static void intel_finish_crtc_commit(struct drm_crtc *crtc,
> >>  		intel_atomic_get_new_crtc_state(old_intel_state, intel_crtc);
> >>  
> >>  	intel_pipe_update_end(new_crtc_state);
> >> +
> >> +	if (new_crtc_state->update_pipe &&
> >> +	    !needs_modeset(&new_crtc_state->base) &&
> >> +	    old_crtc_state->mode.private_flags & I915_MODE_FLAG_INHERITED) {
> >> +		if (!IS_GEN2(dev_priv))
> >> +			intel_set_cpu_fifo_underrun_reporting(dev_priv, intel_crtc->pipe, true);
> >> +
> >> +		if (new_crtc_state->has_pch_encoder)
> >> +			intel_set_pch_fifo_underrun_reporting(dev_priv, intel_crtc->pipe, true);
> > Still using the wrong transcoder for HSW/BDW.
> Would it be better with a call to intel_crtc_pch_transcoder?

That should do it (+ probably want to remove the crtc->config usage from
therein).

-- 
Ville Syrjälä
Intel OTC
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