[Intel-gfx] [PATCH 3/6] drm/i915: add plane_config fetching infrastructure

[Jesse Barnes]

Early at init time, we can try to read out the plane config structure
and try to preserve it if possible.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_drv.h      |    3 ++
 drivers/gpu/drm/i915/intel_display.c |   82 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |    8 ++++
 3 files changed, 93 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2572a95..294df4c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -397,6 +397,7 @@ struct drm_i915_error_state {
 
 struct intel_connector;
 struct intel_crtc_config;
+struct intel_plane_config;
 struct intel_crtc;
 struct intel_limit;
 struct dpll;
@@ -435,6 +436,8 @@ struct drm_i915_display_funcs {
 	 * fills out the pipe-config with the hw state. */
 	bool (*get_pipe_config)(struct intel_crtc *,
 				struct intel_crtc_config *);
+	void (*get_plane_config)(struct intel_crtc *,
+				 struct intel_plane_config *);
 	int (*crtc_mode_set)(struct drm_crtc *crtc,
 			     int x, int y,
 			     struct drm_framebuffer *old_fb);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 351f722..e986c0b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2047,6 +2047,66 @@ unsigned long intel_gen4_compute_page_offset(int *x, int *y,
 	}
 }
 
+int intel_format_to_fourcc(int format)
+{
+	switch (format) {
+	case DISPPLANE_8BPP:
+		return DRM_FORMAT_C8;
+	case DISPPLANE_BGRX555:
+		return DRM_FORMAT_XRGB1555;
+	case DISPPLANE_BGRX565:
+		return DRM_FORMAT_RGB565;
+	default:
+	case DISPPLANE_BGRX888:
+		return DRM_FORMAT_XRGB8888;
+	case DISPPLANE_RGBX888:
+		return DRM_FORMAT_XBGR8888;
+	case DISPPLANE_BGRX101010:
+		return DRM_FORMAT_XRGB2101010;
+	case DISPPLANE_RGBX101010:
+		return DRM_FORMAT_XBGR2101010;
+	}
+}
+
+static void intel_alloc_plane_obj(struct drm_device *dev,
+				  struct intel_plane_config *plane_config,
+				  u32 base, int fourcc)
+{
+	struct drm_i915_gem_object *obj = NULL;
+	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
+
+	obj = i915_gem_object_create_stolen_for_preallocated(dev, base, base,
+							     plane_config->size);
+	if (!obj)
+		return;
+
+	if (plane_config->tiled) {
+		obj->tiling_mode = I915_TILING_X;
+		obj->stride = plane_config->fb->base.pitches[0];
+	}
+
+	mode_cmd.pixel_format = fourcc;
+	mode_cmd.width = plane_config->fb->base.width;
+	mode_cmd.height = plane_config->fb->base.height;
+	mode_cmd.pitches[0] = plane_config->fb->base.pitches[0];
+
+	mutex_lock(&dev->struct_mutex);
+
+	if (intel_framebuffer_init(dev, plane_config->fb, &mode_cmd, obj)) {
+		DRM_DEBUG_KMS("intel fb init failed\n");
+		goto out_unref_obj;
+	}
+
+	mutex_unlock(&dev->struct_mutex);
+	DRM_DEBUG_KMS("plane fb obj %p\n", plane_config->fb->obj);
+	return;
+
+out_unref_obj:
+	drm_gem_object_unreference(&obj->base);
+	mutex_unlock(&dev->struct_mutex);
+
+}
+
 static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 			     int x, int y)
 {
@@ -11023,6 +11083,7 @@ void intel_modeset_suspend_hw(struct drm_device *dev)
 void intel_modeset_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *crtc;
 	int i, j, ret;
 
 	drm_mode_config_init(dev);
@@ -11084,6 +11145,27 @@ void intel_modeset_init(struct drm_device *dev)
 	intel_disable_fbc(dev);
 
 	intel_modeset_setup_hw_state(dev, false);
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list,
+			    base.head) {
+		if (!crtc->active)
+			continue;
+
+#if IS_ENABLED(CONFIG_FB)
+		/*
+		 * We don't have a good way of freeing the buffer w/o the FB
+		 * layer owning it...
+		 * Note that reserving the BIOS fb up front prevents us
+		 * from stuffing other stolen allocations like the ring
+		 * on top.  This prevents some ugliness at boot time, and
+		 * can even allow for smooth boot transitions if the BIOS
+		 * fb is large enough for the active pipe configuration.
+		 */
+		if (dev_priv->display.get_plane_config)
+			dev_priv->display.get_plane_config(crtc,
+							   &crtc->plane_config);
+#endif
+	}
 }
 
 static void
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index bff5d0a..abe576d 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -210,6 +210,12 @@ typedef struct dpll {
 	int	p;
 } intel_clock_t;
 
+struct intel_plane_config {
+	struct intel_framebuffer *fb; /* ends up managed by intel_fbdev.c */
+	bool tiled;
+	int size;
+};
+
 struct intel_crtc_config {
 	/**
 	 * quirks - bitfield with hw state readout quirks
@@ -358,6 +364,7 @@ struct intel_crtc {
 	int16_t cursor_width, cursor_height;
 	bool cursor_visible;
 
+	struct intel_plane_config plane_config;
 	struct intel_crtc_config config;
 	struct intel_crtc_config *new_config;
 	bool new_enabled;
@@ -728,6 +735,7 @@ void intel_display_set_init_power(struct drm_device *dev, bool enable);
 int valleyview_get_vco(struct drm_i915_private *dev_priv);
 void intel_mode_from_pipe_config(struct drm_display_mode *mode,
 				 struct intel_crtc_config *pipe_config);
+int intel_format_to_fourcc(int format);
 
 /* intel_dp.c */
 void intel_dp_init(struct drm_device *dev, int output_reg, enum port port);
-- 
1.7.9.5