[Intel-gfx] [PATCH v3 11/20] drm/i915: Readout initial hw mode.

[Maarten Lankhorst]

Atomic requires a mode blob when crtc_state->enable is true.

With a few tweaks the mode we read out from hardware could be used
as the real mode without a modeset, but this requires too much
testing, so force a modeset the first time the mode blob's updated.

This preserves the old behavior, because previously we never set
the initial mode, which always meant that a modeset happened
when the mode was first set.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 38 ++++++++++++++++--------------------
 drivers/gpu/drm/i915/intel_fbdev.c   | 11 +++--------
 2 files changed, 20 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 80e878929bab..a4a2c3fbdc2d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13153,7 +13153,7 @@ intel_modeset_compute_config(struct drm_atomic_state *state)
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
 		struct intel_crtc_state *pipe_config =
 			to_intel_crtc_state(crtc_state);
-		bool modeset, recalc;
+		bool modeset, recalc = false;
 
 		if (!crtc_state->enable) {
 			if (needs_modeset(crtc_state))
@@ -13162,7 +13162,9 @@ intel_modeset_compute_config(struct drm_atomic_state *state)
 		}
 
 		modeset = needs_modeset(crtc_state);
-		recalc = pipe_config->quirks & PIPE_CONFIG_QUIRK_INHERITED_MODE;
+		if (!modeset && crtc_state->mode_blob != crtc->state->mode_blob &&
+		    pipe_config->quirks & PIPE_CONFIG_QUIRK_INHERITED_MODE)
+			recalc = true;
 
 		if (!modeset && !recalc)
 			continue;
@@ -13177,9 +13179,10 @@ intel_modeset_compute_config(struct drm_atomic_state *state)
 		if (ret)
 			return ret;
 
-		if (recalc && !intel_pipe_config_compare(state->dev,
+		if (recalc && (!i915.fastboot ||
+		    !intel_pipe_config_compare(state->dev,
 					to_intel_crtc_state(crtc->state),
-					pipe_config, true)) {
+					pipe_config, true))) {
 			modeset = crtc_state->mode_changed = true;
 
 			ret = drm_atomic_add_affected_planes(state, crtc);
@@ -15463,11 +15466,19 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 		crtc->active = dev_priv->display.get_pipe_config(crtc,
 								 crtc->config);
 
-		crtc->base.state->enable = crtc->active;
 		crtc->base.state->active = crtc->active;
 		crtc->base.enabled = crtc->active;
-		crtc->base.hwmode = crtc->config->base.adjusted_mode;
 
+		memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
+		if (crtc->base.state->active) {
+			intel_mode_from_pipe_config(&crtc->base.mode, crtc->config);
+			intel_mode_from_pipe_config(&crtc->base.state->adjusted_mode, crtc->config);
+			WARN_ON(drm_atomic_set_mode_for_crtc(crtc->base.state, &crtc->base.mode));
+
+			crtc->base.state->mode.type = 0;
+		}
+
+		crtc->base.hwmode = crtc->config->base.adjusted_mode;
 		readout_plane_state(crtc, to_intel_crtc_state(crtc->base.state));
 
 		DRM_DEBUG_KMS("[CRTC:%d] hw state readout: %s\n",
@@ -15544,21 +15555,6 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
 
 	intel_modeset_readout_hw_state(dev);
 
-	/*
-	 * Now that we have the config, copy it to each CRTC struct
-	 * Note that this could go away if we move to using crtc_config
-	 * checking everywhere.
-	 */
-	for_each_intel_crtc(dev, crtc) {
-		if (crtc->active && i915.fastboot) {
-			intel_mode_from_pipe_config(&crtc->base.mode,
-						    crtc->config);
-			DRM_DEBUG_KMS("[CRTC:%d] found active mode: ",
-				      crtc->base.base.id);
-			drm_mode_debug_printmodeline(&crtc->base.mode);
-		}
-	}
-
 	/* HW state is read out, now we need to sanitize this mess. */
 	for_each_intel_encoder(dev, encoder) {
 		intel_sanitize_encoder(encoder);
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index b791f2374f3b..7eff33ff84f6 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -483,18 +483,13 @@ retry:
 			 * IMPORTANT: We want to use the adjusted mode (i.e.
 			 * after the panel fitter upscaling) as the initial
 			 * config, not the input mode, which is what crtc->mode
-			 * usually contains. But since our current fastboot
+			 * usually contains. But since our current
 			 * code puts a mode derived from the post-pfit timings
-			 * into crtc->mode this works out correctly. We don't
-			 * use hwmode anywhere right now, so use it for this
-			 * since the fb helper layer wants a pointer to
-			 * something we own.
+			 * into crtc->mode this works out correctly.
 			 */
 			DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 				      connector->name);
-			intel_mode_from_pipe_config(&encoder->crtc->hwmode,
-						    to_intel_crtc(encoder->crtc)->config);
-			modes[i] = &encoder->crtc->hwmode;
+			modes[i] = &encoder->crtc->mode;
 		}
 		crtcs[i] = new_crtc;
 
-- 
2.1.0