linux-kernel - [PATCH] drm/i915/dp: allow configuring eDP panel fitting scaling mode

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Date:	Thu, 25 Oct 2012 13:57:47 -0400
From:	Yuly Novikov <ynovikov@...omium.org>
To:	daniel.vetter@...ll.ch, airlied@...ux.ie
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Yuly Novikov <ynovikov@...omium.org>
Subject: [PATCH] drm/i915/dp: allow configuring eDP panel fitting scaling mode

LVDS allowed changing panel fitting scaling mode, while eDP didn't.
Copied relevant code from LVDS to eDP.
This also changes default mode on eDP to ascpect ratio preserving scaling.

Signed-off-by: Yuly Novikov <ynovikov@...omium.org>
---
 drivers/gpu/drm/i915/intel_dp.c  |   33 ++++++++++++++++++++++++++++++---
 drivers/gpu/drm/i915/intel_drv.h |    1 +
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 368ed8e..a65546e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -685,7 +685,7 @@ intel_dp_mode_fixup(struct drm_encoder *encoder,
 
 	if (is_edp(intel_dp) && intel_dp->panel_fixed_mode) {
 		intel_fixed_panel_mode(intel_dp->panel_fixed_mode, adjusted_mode);
-		intel_pch_panel_fitting(dev, DRM_MODE_SCALE_FULLSCREEN,
+		intel_pch_panel_fitting(dev, intel_dp->fitting_mode,
 					mode, adjusted_mode);
 	}
 
@@ -2358,6 +2358,22 @@ intel_dp_set_property(struct drm_connector *connector,
 		goto done;
 	}
 
+	if (is_edp(intel_dp) &&
+		property == connector->dev->mode_config.scaling_mode_property) {
+		if (val == DRM_MODE_SCALE_NONE) {
+			DRM_DEBUG_KMS("no scaling not supported\n");
+			return -EINVAL;
+		}
+
+		if (intel_dp->fitting_mode == val) {
+			/* the eDP scaling property is not changed */
+			return 0;
+		}
+		intel_dp->fitting_mode = val;
+
+		goto done;
+	}
+
 	return -EINVAL;
 
 done:
@@ -2469,10 +2485,21 @@ bool intel_dpd_is_edp(struct drm_device *dev)
 }
 
 static void
-intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connector)
+intel_dp_add_properties(struct drm_device *dev,
+			struct intel_dp *intel_dp,
+			struct drm_connector *connector)
 {
 	intel_attach_force_audio_property(connector);
 	intel_attach_broadcast_rgb_property(connector);
+
+	if (is_edp(intel_dp)) {
+		drm_mode_create_scaling_mode_property(dev);
+		drm_connector_attach_property(
+			connector,
+			dev->mode_config.scaling_mode_property,
+			DRM_MODE_SCALE_ASPECT);
+		intel_dp->fitting_mode = DRM_MODE_SCALE_ASPECT;
+	}
 }
 
 void
@@ -2665,7 +2692,7 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
 		intel_panel_setup_backlight(dev);
 	}
 
-	intel_dp_add_properties(intel_dp, connector);
+	intel_dp_add_properties(dev, intel_dp, connector);
 
 	/* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
 	 * 0xd.  Failure to do so will result in spurious interrupts being
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index fe71425..da50cd4 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -358,6 +358,7 @@ struct intel_dp {
 	int backlight_on_delay;
 	int backlight_off_delay;
 	struct drm_display_mode *panel_fixed_mode;  /* for eDP */
+	int fitting_mode;  /* for eDP */
 	struct delayed_work panel_vdd_work;
 	bool want_panel_vdd;
 	struct edid *edid; /* cached EDID for eDP */
-- 
1.7.7.3

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