[PATCH 3/3] drm/i915: add 'rotation' CRTC property

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

This property is needed by to inform the KVMr feature about our
current rotation: whenever we change the rotation, we should change
that property so that the KVMr knows that the screen is rotated.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      |    5 +++
 drivers/gpu/drm/i915/intel_display.c |   57 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |    2 +
 3 files changed, 64 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c3afb78..49e4f10 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2324,6 +2324,11 @@
 #define   PIPECONF_INTERLACE_FIELD_0_ONLY		(7 << 21)
 #define   PIPECONF_INTERLACE_MASK	(7 << 21)
 #define   PIPECONF_CXSR_DOWNCLOCK	(1<<16)
+#define   PIPECONF_ROTATION_MASK	(3 << 14)
+#define   PIPECONF_ROTATION_0	(0 << 14)
+#define   PIPECONF_ROTATION_90	(1 << 14)
+#define   PIPECONF_ROTATION_180	(2 << 14)
+#define   PIPECONF_ROTATION_270	(3 << 14)
 #define   PIPECONF_BPP_MASK	(0x000000e0)
 #define   PIPECONF_BPP_8	(0<<5)
 #define   PIPECONF_BPP_10	(1<<5)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 29743de..7ec1b18 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7072,6 +7072,8 @@ static void intel_crtc_destroy(struct drm_crtc *crtc)
 		kfree(work);
 	}
 
+	drm_property_destroy(dev, intel_crtc->rotation_property);
+
 	drm_crtc_cleanup(crtc);
 
 	kfree(intel_crtc);
@@ -7529,6 +7531,49 @@ static void intel_crtc_reset(struct drm_crtc *crtc)
 	intel_sanitize_modesetting(dev, intel_crtc->pipe, intel_crtc->plane);
 }
 
+static void intel_crtc_set_rotation(struct drm_crtc *crtc,
+				    uint64_t rotation)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	int reg = PIPECONF(intel_crtc->pipe);
+	u32 val = I915_READ(reg);
+
+	val &= ~PIPECONF_ROTATION_MASK;
+
+	switch (rotation) {
+	case 0:
+		val |= PIPECONF_ROTATION_0;
+		break;
+	case 90:
+		val |= PIPECONF_ROTATION_90;
+		break;
+	case 180:
+		val |= PIPECONF_ROTATION_180;
+		break;
+	case 270:
+		val |= PIPECONF_ROTATION_270;
+		break;
+	default:
+		DRM_ERROR("Unsupported rotation: %Lu\n", rotation);
+		val |= PIPECONF_ROTATION_0;
+	}
+
+	I915_WRITE(reg, val);
+}
+
+static int intel_crtc_set_property(struct drm_crtc *crtc,
+				   struct drm_property *property,
+				   uint64_t val)
+{
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+	if (property == intel_crtc->rotation_property)
+		intel_crtc_set_rotation(crtc, val);
+	return 0;
+}
+
 static struct drm_crtc_helper_funcs intel_helper_funcs = {
 	.dpms = intel_crtc_dpms,
 	.mode_fixup = intel_crtc_mode_fixup,
@@ -7547,12 +7592,14 @@ static const struct drm_crtc_funcs intel_crtc_funcs = {
 	.set_config = drm_crtc_helper_set_config,
 	.destroy = intel_crtc_destroy,
 	.page_flip = intel_crtc_page_flip,
+	.set_property = intel_crtc_set_property,
 };
 
 static void intel_crtc_init(struct drm_device *dev, int pipe)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc;
+	struct drm_property *prop;
 	int i;
 
 	intel_crtc = kzalloc(sizeof(struct intel_crtc) + (INTELFB_CONN_LIMIT * sizeof(struct drm_connector *)), GFP_KERNEL);
@@ -7568,6 +7615,16 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
 		intel_crtc->lut_b[i] = i;
 	}
 
+	prop = drm_property_create(dev, DRM_MODE_PROP_RANGE, "rotation", 2);
+	if (prop == NULL) {
+		DRM_ERROR("Failed to create rotation property!\n");
+		BUG();
+	}
+	prop->values[0] = 0;
+	prop->values[1] = 359;
+	drm_crtc_attach_property(&intel_crtc->base, prop, 0);
+	intel_crtc->rotation_property = prop;
+
 	/* Swap pipes & planes for FBC on pre-965 */
 	intel_crtc->pipe = pipe;
 	intel_crtc->plane = pipe;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 5ac8a16..26bdc65 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -176,6 +176,8 @@ struct intel_crtc {
 
 	bool no_pll; /* tertiary pipe for IVB */
 	bool use_pll_a;
+
+	struct drm_property *rotation_property;
 };
 
 struct intel_plane {
-- 
1.7.8.3