[Intel-gfx] [PATCH 10/19] drm/i915: check pipe power domain when reading its hw state

[Imre Deak]

We can read out the pipe HW state only if the required power domain is
on. If not we consider the pipe to be off.

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ce1c00a..e3824f8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9535,6 +9535,18 @@ check_encoder_state(struct drm_device *dev)
 	}
 }
 
+static bool intel_display_get_pipe_config(struct intel_crtc *crtc,
+					  struct intel_crtc_config *pipe_config)
+{
+	struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
+
+	if (!intel_display_power_enabled(dev_priv,
+					 POWER_DOMAIN_PIPE(crtc->pipe)))
+		return false;
+
+	return dev_priv->display.get_pipe_config(crtc, pipe_config);
+}
+
 static void
 check_crtc_state(struct drm_device *dev)
 {
@@ -9572,8 +9584,7 @@ check_crtc_state(struct drm_device *dev)
 		     "crtc's computed enabled state doesn't match tracked enabled state "
 		     "(expected %i, found %i)\n", enabled, crtc->base.enabled);
 
-		active = dev_priv->display.get_pipe_config(crtc,
-							   &pipe_config);
+		active = intel_display_get_pipe_config(crtc, &pipe_config);
 
 		/* hw state is inconsistent with the pipe A quirk */
 		if (crtc->pipe == PIPE_A && dev_priv->quirks & QUIRK_PIPEA_FORCE)
@@ -11328,8 +11339,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 			    base.head) {
 		memset(&crtc->config, 0, sizeof(crtc->config));
 
-		crtc->active = dev_priv->display.get_pipe_config(crtc,
-								 &crtc->config);
+		crtc->active = intel_display_get_pipe_config(crtc,
+							     &crtc->config);
 
 		crtc->base.enabled = crtc->active;
 		crtc->primary_enabled = crtc->active;
-- 
1.8.4