[Intel-gfx] [PATCH 64/76] drm/i915: push commit_output_state past the crtc/encoder preparing

[Daniel Vetter]

With this change we can (finally!) rip out a few of the temporary hacks
and clean up a few other things:
- Kill intel_crtc_prepare_encoders, now unused.
- Kill the hacks in the crtc_disable/enable functions to always call the
  encoder callbacks, we now always call the crtc functions with the right
  encoder -> crtc links.
- Also push down the crtc->enable, encoder and connector dpms state
  updates. Unfortunately we can't add a WARN in the crtc_disable
  callbacks to ensure that the crtc is always still enabled when
  disabling an output pipe - the crtc sanitizer of the hw readout path
  can hit this when it needs to disable an active pipe without any
  enabled outputs.
- Only call crtc->disable if the pipe is already enabled - again avoids
  running afoul of the new WARN.

v2: Copy&paste our own version of crtc_in_use, too.

v3: We need to update the dpms an encoder->connectors_active states,
too.

v4: I've forgotten to kill the unconditional encoder->disable calls in
the crtc_disable functions.

v5: Rip out leftover debug printk.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/intel_display.c |   85 +++++++++++++++++++---------------
 1 file changed, 47 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6166708..99f4e55 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3220,10 +3220,8 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 
 	WARN_ON(!crtc->enabled);
 
-	/* XXX: For compatability with the crtc helper code, call the encoder's
-	 * enable function unconditionally for now. */
 	if (intel_crtc->active)
-		goto encoders;
+		return;
 
 	intel_crtc->active = true;
 	intel_update_watermarks(dev);
@@ -3271,7 +3269,6 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 
 	intel_crtc_update_cursor(crtc, true);
 
-encoders:
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		encoder->enable(encoder);
 
@@ -3289,14 +3286,13 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
 	int plane = intel_crtc->plane;
 	u32 reg, temp;
 
-	/* XXX: For compatability with the crtc helper code, call the encoder's
-	 * disable function unconditionally for now. */
-	for_each_encoder_on_crtc(dev, crtc, encoder)
-		encoder->disable(encoder);
 
 	if (!intel_crtc->active)
 		return;
 
+	for_each_encoder_on_crtc(dev, crtc, encoder)
+		encoder->disable(encoder);
+
 	intel_crtc_wait_for_pending_flips(crtc);
 	drm_vblank_off(dev, pipe);
 	intel_crtc_update_cursor(crtc, false);
@@ -3398,10 +3394,8 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 
 	WARN_ON(!crtc->enabled);
 
-	/* XXX: For compatability with the crtc helper code, call the encoder's
-	 * enable function unconditionally for now. */
 	if (intel_crtc->active)
-		goto encoders;
+		return;
 
 	intel_crtc->active = true;
 	intel_update_watermarks(dev);
@@ -3417,7 +3411,6 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 	intel_crtc_dpms_overlay(intel_crtc, true);
 	intel_crtc_update_cursor(crtc, true);
 
-encoders:
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		encoder->enable(encoder);
 }
@@ -3431,14 +3424,13 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 	int pipe = intel_crtc->pipe;
 	int plane = intel_crtc->plane;
 
-	/* XXX: For compatability with the crtc helper code, call the encoder's
-	 * disable function unconditionally for now. */
-	for_each_encoder_on_crtc(dev, crtc, encoder)
-		encoder->disable(encoder);
 
 	if (!intel_crtc->active)
 		return;
 
+	for_each_encoder_on_crtc(dev, crtc, encoder)
+		encoder->disable(encoder);
+
 	/* Give the overlay scaler a chance to disable if it's on this pipe */
 	intel_crtc_wait_for_pending_flips(crtc);
 	drm_vblank_off(dev, pipe);
@@ -6558,18 +6550,6 @@ static bool intel_encoder_crtc_ok(struct drm_encoder *encoder,
 	return false;
 }
 
-static void
-intel_crtc_prepare_encoders(struct drm_device *dev)
-{
-	struct intel_encoder *encoder;
-
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
-		/* Disable unused encoders */
-		if (encoder->base.crtc == NULL)
-			encoder->disable(encoder);
-	}
-}
-
 /**
  * intel_modeset_update_staged_output_state
  *
@@ -6742,6 +6722,18 @@ intel_modeset_affected_pipes(struct drm_crtc *crtc, unsigned *modeset_pipes,
 	*prepare_pipes &= ~(*disable_pipes);
 }
 
+static bool intel_crtc_in_use(struct drm_crtc *crtc)
+{
+	struct drm_encoder *encoder;
+	struct drm_device *dev = crtc->dev;
+
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
+		if (encoder->crtc == crtc)
+			return true;
+
+	return false;
+}
+
 #define for_each_intel_crtc_masked(dev, mask, intel_crtc) \
 	list_for_each_entry((intel_crtc), \
 			    &(dev)->mode_config.crtc_list, \
@@ -6758,6 +6750,7 @@ bool intel_set_mode(struct drm_crtc *crtc,
 	struct drm_encoder_helper_funcs *encoder_funcs;
 	struct drm_encoder *encoder;
 	struct intel_crtc *intel_crtc;
+	struct drm_connector *connector;
 	unsigned disable_pipes, prepare_pipes, modeset_pipes;
 	bool ret = true;
 
@@ -6770,12 +6763,6 @@ bool intel_set_mode(struct drm_crtc *crtc,
 	for_each_intel_crtc_masked(dev, disable_pipes, intel_crtc)
 		intel_crtc_disable(&intel_crtc->base);
 
-	intel_modeset_commit_output_state(dev);
-
-	list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list,
-			    base.head)
-		intel_crtc->base.enabled = drm_helper_crtc_in_use(crtc);
-
 	saved_hwmode = crtc->hwmode;
 	saved_mode = crtc->mode;
 
@@ -6790,12 +6777,12 @@ bool intel_set_mode(struct drm_crtc *crtc,
 		if (IS_ERR(adjusted_mode)) {
 			return false;
 		}
-
-		intel_crtc_prepare_encoders(dev);
 	}
 
-	for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc)
-		dev_priv->display.crtc_disable(&intel_crtc->base);
+	for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc) {
+		if (intel_crtc->base.enabled)
+			dev_priv->display.crtc_disable(&intel_crtc->base);
+	}
 
 	if (modeset_pipes) {
 		crtc->mode = *mode;
@@ -6803,6 +6790,28 @@ bool intel_set_mode(struct drm_crtc *crtc,
 		crtc->y = y;
 	}
 
+	/* Only after disabling all output pipelines that will be changed can we
+	 * update the the output configuration. */
+	intel_modeset_commit_output_state(dev);
+
+	/* Update computed state. */
+	list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list,
+			    base.head) {
+		intel_crtc->base.enabled = intel_crtc_in_use(&intel_crtc->base);
+	}
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		if (!connector->encoder || !connector->encoder->crtc)
+			continue;
+
+		intel_crtc = to_intel_crtc(connector->encoder->crtc);
+
+		if (prepare_pipes & (1 << intel_crtc->pipe))
+			connector->dpms = DRM_MODE_DPMS_ON;
+
+		to_intel_encoder(connector->encoder)->connectors_active = true;
+	}
+
 	/* Set up the DPLL and any encoders state that needs to adjust or depend
 	 * on the DPLL.
 	 */
-- 
1.7.10.4