drm/i915: Reuse normal state readout for LVDS/DVO fixed mode

Reuse the normal state readout code to get the fixed mode for LVDS/DVO
encoders. This removes some partially duplicated state readout code
from LVDS/DVO encoders. The duplicated code wasn't actually even
populating the negative h/vsync flags, leading to possible state checker
complaints. The normal readout code populates that stuff fully.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171009161951.22420-1-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_display.c

@@ -10238,48 +10238,44 @@ static void ironlake_pch_clock_get(struct intel_crtc *crtc,
 					 &pipe_config->fdi_m_n);
 }
 
-/** Returns the currently programmed mode of the given pipe. */
-struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
-					     struct drm_crtc *crtc)
+/* Returns the currently programmed mode of the given encoder. */
+struct drm_display_mode *
+intel_encoder_current_mode(struct intel_encoder *encoder)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_crtc_state *crtc_state;
 	struct drm_display_mode *mode;
-	struct intel_crtc_state *pipe_config;
-	enum pipe pipe = intel_crtc->pipe;
+	struct intel_crtc *crtc;
+	enum pipe pipe;
+
+	if (!encoder->get_hw_state(encoder, &pipe))
+		return NULL;
+
+	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
 
 	mode = kzalloc(sizeof(*mode), GFP_KERNEL);
 	if (!mode)
 		return NULL;
 
-	pipe_config = kzalloc(sizeof(*pipe_config), GFP_KERNEL);
-	if (!pipe_config) {
+	crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL);
+	if (!crtc_state) {
 		kfree(mode);
 		return NULL;
 	}
 
-	/*
-	 * Construct a pipe_config sufficient for getting the clock info
-	 * back out of crtc_clock_get.
-	 *
-	 * Note, if LVDS ever uses a non-1 pixel multiplier, we'll need
-	 * to use a real value here instead.
-	 */
-	pipe_config->cpu_transcoder = (enum transcoder) pipe;
-	pipe_config->pixel_multiplier = 1;
-	pipe_config->dpll_hw_state.dpll = I915_READ(DPLL(pipe));
-	pipe_config->dpll_hw_state.fp0 = I915_READ(FP0(pipe));
-	pipe_config->dpll_hw_state.fp1 = I915_READ(FP1(pipe));
-	i9xx_crtc_clock_get(intel_crtc, pipe_config);
+	crtc_state->base.crtc = &crtc->base;
 
-	pipe_config->base.adjusted_mode.crtc_clock =
-		pipe_config->port_clock / pipe_config->pixel_multiplier;
+	if (!dev_priv->display.get_pipe_config(crtc, crtc_state)) {
+		kfree(crtc_state);
+		kfree(mode);
+		return NULL;
+	}
 
-	intel_get_pipe_timings(intel_crtc, pipe_config);
+	encoder->get_config(encoder, crtc_state);
 
-	intel_mode_from_pipe_config(mode, pipe_config);
+	intel_mode_from_pipe_config(mode, crtc_state);
 
-	kfree(pipe_config);
+	kfree(crtc_state);
 
 	return mode;
 }

drivers/gpu/drm/i915/intel_drv.h

@@ -1363,8 +1363,9 @@ struct intel_connector *intel_connector_alloc(void);
 bool intel_connector_get_hw_state(struct intel_connector *connector);
 void intel_connector_attach_encoder(struct intel_connector *connector,
 				    struct intel_encoder *encoder);
-struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
-					     struct drm_crtc *crtc);
+struct drm_display_mode *
+intel_encoder_current_mode(struct intel_encoder *encoder);
+
 enum pipe intel_get_pipe_from_connector(struct intel_connector *connector);
 int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
 				struct drm_file *file_priv);

drivers/gpu/drm/i915/intel_dvo.c

@@ -379,32 +379,15 @@ static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
  * chip being on DVOB/C and having multiple pipes.
  */
 static struct drm_display_mode *
-intel_dvo_get_current_mode(struct drm_connector *connector)
+intel_dvo_get_current_mode(struct intel_encoder *encoder)
 {
-	struct drm_device *dev = connector->dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
-	uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
-	struct drm_display_mode *mode = NULL;
+	struct drm_display_mode *mode;
 
-	/* If the DVO port is active, that'll be the LVDS, so we can pull out
-	 * its timings to get how the BIOS set up the panel.
-	 */
-	if (dvo_val & DVO_ENABLE) {
-		struct intel_crtc *crtc;
-		int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
-
-		crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
-		if (crtc) {
-			mode = intel_crtc_mode_get(dev, &crtc->base);
-			if (mode) {
-				mode->type |= DRM_MODE_TYPE_PREFERRED;
-				if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
-					mode->flags |= DRM_MODE_FLAG_PHSYNC;
-				if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
-					mode->flags |= DRM_MODE_FLAG_PVSYNC;
-			}
-		}
+	mode = intel_encoder_current_mode(encoder);
+	if (mode) {
+		DRM_DEBUG_KMS("using current (BIOS) mode: ");
+		drm_mode_debug_printmodeline(mode);
+		mode->type |= DRM_MODE_TYPE_PREFERRED;
 	}
 
 	return mode;
@@ -551,7 +534,7 @@ void intel_dvo_init(struct drm_i915_private *dev_priv)
 			 * mode being output through DVO.
 			 */
 			intel_panel_init(&intel_connector->panel,
-					 intel_dvo_get_current_mode(connector),
+					 intel_dvo_get_current_mode(intel_encoder),
 					 NULL, NULL);
 			intel_dvo->panel_wants_dither = true;
 		}

drivers/gpu/drm/i915/intel_lvds.c

@@ -939,10 +939,8 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	struct drm_display_mode *fixed_mode = NULL;
 	struct drm_display_mode *downclock_mode = NULL;
 	struct edid *edid;
-	struct intel_crtc *crtc;
 	i915_reg_t lvds_reg;
 	u32 lvds;
-	int pipe;
 	u8 pin;
 	u32 allowed_scalers;
 
@@ -1118,17 +1116,11 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	if (HAS_PCH_SPLIT(dev_priv))
 		goto failed;
 
-	pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
-	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
-
-	if (crtc && (lvds & LVDS_PORT_EN)) {
-		fixed_mode = intel_crtc_mode_get(dev, &crtc->base);
-		if (fixed_mode) {
-			DRM_DEBUG_KMS("using current (BIOS) mode: ");
-			drm_mode_debug_printmodeline(fixed_mode);
-			fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
-			goto out;
-		}
+	fixed_mode = intel_encoder_current_mode(intel_encoder);
+	if (fixed_mode) {
+		DRM_DEBUG_KMS("using current (BIOS) mode: ");
+		drm_mode_debug_printmodeline(fixed_mode);
+		fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 	}
 
 	/* If we still don't have a mode after all that, give up. */