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.
Changes since v3:
- Use intel_crtc_pch_transcoder to determine pch transcoder for underruns. (Ville)
- Remove crtc->config dereference in intel_crtc_pch_transcoder. (Ville)
Testcase: debugfs_test.read_all_entries
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 03e274a11d95..e49ee9d3bd61 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1872,8 +1872,6 @@ enum pipe intel_crtc_pch_transcoder(struct intel_crtc *crtc)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
- WARN_ON(!crtc->config->has_pch_encoder);
-
if (HAS_PCH_LPT(dev_priv))
return PIPE_A;
else
@@ -12908,6 +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);
@@ -12915,6 +12914,20 @@ 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) {
+ enum pipe pch_transcoder =
+ intel_crtc_pch_transcoder(dev_priv, intel_crtc);
+
+ intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder, true);
+ }
+ }
}
/**
--
2.15.0
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