[PATCH RFC xf86-video-intel 1/2] Update the rotation property whenever we change the rotation.

[Paulo Zanoni]

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

Don't worry if that fails: only the KVMr feature will be affected.

We still need to change the sna/ code.
We also need to add the dependency on libdrm.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 src/intel.h         |    3 ++
 src/intel_display.c |   80 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/intel_driver.c  |    2 +
 3 files changed, 85 insertions(+), 0 deletions(-)

This is just an RFC. Read comment from Kernel patch 0007.

diff --git a/src/intel.h b/src/intel.h
index f806aea..29df531 100644
--- a/src/intel.h
+++ b/src/intel.h
@@ -644,4 +644,7 @@ static inline Bool intel_pixmap_is_offscreen(PixmapPtr pixmap)
 	return priv && priv->offscreen;
 }
 
+/* intel_display.c */
+void intel_crtc_leave_vt(ScrnInfoPtr scrn);
+
 #endif /* _I830_H_ */
diff --git a/src/intel_display.c b/src/intel_display.c
index abdc372..0dd85b8 100644
--- a/src/intel_display.c
+++ b/src/intel_display.c
@@ -82,6 +82,7 @@ struct intel_crtc {
 	uint32_t rotate_fb_id;
 	xf86CrtcPtr crtc;
 	struct list link;
+	drmModePropertyPtr rotation_prop;
 };
 
 struct intel_property {
@@ -418,6 +419,44 @@ done:
 	return ret;
 }
 
+static void
+intel_crtc_inform_rotation(xf86CrtcPtr crtc, Rotation rotation)
+{
+	struct intel_crtc *intel_crtc = crtc->driver_private;
+	int ret, int_rotation;
+
+	/* Try to inform the Kernel about our current rotation but don't
+	 * worry if that fails */
+	if (!intel_crtc->rotation_prop)
+		return;
+
+	switch (rotation) {
+	case RR_Rotate_0:
+		int_rotation = 0;
+		break;
+	case RR_Rotate_90:
+		int_rotation = 90;
+		break;
+	case RR_Rotate_180:
+		int_rotation = 180;
+		break;
+	case RR_Rotate_270:
+		int_rotation = 270;
+		break;
+	default:
+		int_rotation = 0;
+	}
+
+	ret = drmModeObjectSetProperty(intel_crtc->mode->fd,
+				       crtc_id(intel_crtc),
+				       DRM_MODE_OBJECT_CRTC,
+				       intel_crtc->rotation_prop->prop_id,
+				       int_rotation);
+	if (ret)
+		xf86DrvMsg(crtc->scrn->scrnIndex, X_WARNING,
+			   "Failed to set CRTC rotation: %s\n", strerror(-ret));
+}
+
 static Bool
 intel_crtc_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 			  Rotation rotation, int x, int y)
@@ -464,6 +503,8 @@ intel_crtc_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 		crtc->y = saved_y;
 		crtc->rotation = saved_rotation;
 		crtc->mode = saved_mode;
+	} else {
+		intel_crtc_inform_rotation(crtc, rotation);
 	}
 	return ret;
 }
@@ -640,12 +681,49 @@ intel_crtc_destroy(xf86CrtcPtr crtc)
 		intel_crtc->cursor = NULL;
 	}
 
+	if (intel_crtc->rotation_prop)
+		drmModeFreeProperty(intel_crtc->rotation_prop);
+
 	list_del(&intel_crtc->link);
 	free(intel_crtc);
 
 	crtc->driver_private = NULL;
 }
 
+static void
+intel_crtc_load_properties(struct intel_mode *mode,
+			   struct intel_crtc *crtc)
+{
+	unsigned int i;
+	drmModeObjectPropertiesPtr props;
+	drmModePropertyPtr prop;
+
+	crtc->rotation_prop = NULL;
+
+	props = drmModeObjectGetProperties(mode->fd, crtc_id(crtc),
+					   DRM_MODE_OBJECT_CRTC);
+	if (props) {
+		for (i = 0; i < props->count_props; i++) {
+			prop = drmModeGetProperty(mode->fd, props->props[i]);
+			if (!strcmp(prop->name, "rotation"))
+				crtc->rotation_prop = prop;
+			else
+				drmModeFreeProperty(prop);
+		}
+		drmModeFreeObjectProperties(props);
+	}
+}
+
+void
+intel_crtc_leave_vt(ScrnInfoPtr scrn)
+{
+	int i;
+	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
+
+	for (i = 0; i < xf86_config->num_crtc; i++)
+		intel_crtc_inform_rotation(xf86_config->crtc[i], RR_Rotate_0);
+}
+
 static const xf86CrtcFuncsRec intel_crtc_funcs = {
 	.dpms = intel_crtc_dpms,
 	.set_mode_major = intel_crtc_set_mode_major,
@@ -692,6 +770,8 @@ intel_crtc_init(ScrnInfoPtr scrn, struct intel_mode *mode, int num)
 
 	intel_crtc->crtc = crtc;
 	list_add(&intel_crtc->link, &mode->crtcs);
+
+	intel_crtc_load_properties(mode, intel_crtc);
 }
 
 static Bool
diff --git a/src/intel_driver.c b/src/intel_driver.c
index 4265de8..98466a3 100644
--- a/src/intel_driver.c
+++ b/src/intel_driver.c
@@ -1115,6 +1115,8 @@ static void I830LeaveVT(int scrnIndex, int flags)
 	intel_screen_private *intel = intel_get_screen_private(scrn);
 	int ret;
 
+	intel_crtc_leave_vt(scrn);
+
 	xf86RotateFreeShadow(scrn);
 
 	xf86_hide_cursors(scrn);
-- 
1.7.9.1