The DDI eDP/pipe A/B/C transcoders must be enabled whenever we observe
the DDI buffer of the port connected to them to be enabled (via
DDI_BUF_CTL). Add a consistency check for this to the HW readout code of
these transcoders.
Signed-off-by: Imre Deak <imre.d...@intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index ad11540ac436..0476d1d33bfb 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2029,6 +2029,8 @@ static void intel_ddi_get_encoder_pipes(struct
intel_encoder *encoder,
if (port == PORT_A) {
tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));
+ WARN_ON(!(tmp & TRANS_DDI_FUNC_ENABLE));
+
switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
default:
MISSING_CASE(tmp & TRANS_DDI_EDP_INPUT_MASK);
@@ -2057,6 +2059,8 @@ static void intel_ddi_get_encoder_pipes(struct
intel_encoder *encoder,
if ((tmp & TRANS_DDI_PORT_MASK) != TRANS_DDI_SELECT_PORT(port))
continue;
+ WARN_ON(!(tmp & TRANS_DDI_FUNC_ENABLE));
+
if ((tmp & TRANS_DDI_MODE_SELECT_MASK) ==
TRANS_DDI_MODE_SELECT_DP_MST)
mst_pipe_mask |= BIT(p);
--
2.13.2
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