drm/exynos: Add plane support with fimd

The exynos fimd supports 5 window overlays. Only one window overlay of
fimd is used by the crtc, so we need plane feature to use the rest
window overlays.

This creates one ioctl exynos specific - DRM_EXYNOS_PLANE_SET_ZPOS, it
is the ioctl to decide for user to assign which window overlay.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

1 files changed, 163 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
new file mode 100644
index 000000000000..c785e34ccff9
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include "drmP.h"
+
+#include "exynos_drm.h"
+#include "exynos_drm_crtc.h"
+#include "exynos_drm_drv.h"
+#include "exynos_drm_encoder.h"
+
+struct exynos_plane {
+	struct drm_plane		base;
+	struct exynos_drm_overlay	overlay;
+	bool				enabled;
+};
+
+static int
+exynos_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
+		     struct drm_framebuffer *fb, int crtc_x, int crtc_y,
+		     unsigned int crtc_w, unsigned int crtc_h,
+		     uint32_t src_x, uint32_t src_y,
+		     uint32_t src_w, uint32_t src_h)
+{
+	struct exynos_plane *exynos_plane =
+		container_of(plane, struct exynos_plane, base);
+	struct exynos_drm_overlay *overlay = &exynos_plane->overlay;
+	struct exynos_drm_crtc_pos pos;
+	unsigned int x = src_x >> 16;
+	unsigned int y = src_y >> 16;
+	int ret;
+
+	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+	memset(&pos, 0, sizeof(struct exynos_drm_crtc_pos));
+	pos.crtc_x = crtc_x;
+	pos.crtc_y = crtc_y;
+	pos.crtc_w = crtc_w;
+	pos.crtc_h = crtc_h;
+
+	pos.fb_x = x;
+	pos.fb_y = y;
+
+	/* TODO: scale feature */
+	ret = exynos_drm_overlay_update(overlay, fb, &crtc->mode, &pos);
+	if (ret < 0)
+		return ret;
+
+	exynos_drm_fn_encoder(crtc, overlay,
+			exynos_drm_encoder_crtc_mode_set);
+	exynos_drm_fn_encoder(crtc, &overlay->zpos,
+			exynos_drm_encoder_crtc_plane_commit);
+
+	exynos_plane->enabled = true;
+
+	return 0;
+}
+
+static int exynos_disable_plane(struct drm_plane *plane)
+{
+	struct exynos_plane *exynos_plane =
+		container_of(plane, struct exynos_plane, base);
+	struct exynos_drm_overlay *overlay = &exynos_plane->overlay;
+
+	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+	if (!exynos_plane->enabled)
+		return 0;
+
+	exynos_drm_fn_encoder(plane->crtc, &overlay->zpos,
+			exynos_drm_encoder_crtc_disable);
+
+	exynos_plane->enabled = false;
+	exynos_plane->overlay.zpos = DEFAULT_ZPOS;
+
+	return 0;
+}
+
+static void exynos_plane_destroy(struct drm_plane *plane)
+{
+	struct exynos_plane *exynos_plane =
+		container_of(plane, struct exynos_plane, base);
+
+	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+	exynos_disable_plane(plane);
+	drm_plane_cleanup(plane);
+	kfree(exynos_plane);
+}
+
+static struct drm_plane_funcs exynos_plane_funcs = {
+	.update_plane	= exynos_update_plane,
+	.disable_plane	= exynos_disable_plane,
+	.destroy	= exynos_plane_destroy,
+};
+
+int exynos_plane_init(struct drm_device *dev, unsigned int nr)
+{
+	struct exynos_plane *exynos_plane;
+	uint32_t possible_crtcs;
+
+	exynos_plane = kzalloc(sizeof(struct exynos_plane), GFP_KERNEL);
+	if (!exynos_plane)
+		return -ENOMEM;
+
+	/* all CRTCs are available */
+	possible_crtcs = (1 << MAX_CRTC) - 1;
+
+	exynos_plane->overlay.zpos = DEFAULT_ZPOS;
+
+	/* TODO: format */
+	return drm_plane_init(dev, &exynos_plane->base, possible_crtcs,
+			      &exynos_plane_funcs, NULL, 0);
+}
+
+int exynos_plane_set_zpos_ioctl(struct drm_device *dev, void *data,
+				struct drm_file *file_priv)
+{
+	struct drm_exynos_plane_set_zpos *zpos_req = data;
+	struct drm_mode_object *obj;
+	struct drm_plane *plane;
+	struct exynos_plane *exynos_plane;
+	int ret = 0;
+
+	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	if (zpos_req->zpos < 0 || zpos_req->zpos >= MAX_PLANE) {
+		if (zpos_req->zpos != DEFAULT_ZPOS) {
+			DRM_ERROR("zpos not within limits\n");
+			return -EINVAL;
+		}
+	}
+
+	mutex_lock(&dev->mode_config.mutex);
+
+	obj = drm_mode_object_find(dev, zpos_req->plane_id,
+			DRM_MODE_OBJECT_PLANE);
+	if (!obj) {
+		DRM_DEBUG_KMS("Unknown plane ID %d\n",
+			      zpos_req->plane_id);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	plane = obj_to_plane(obj);
+	exynos_plane = container_of(plane, struct exynos_plane, base);
+
+	exynos_plane->overlay.zpos = zpos_req->zpos;
+
+out:
+	mutex_unlock(&dev->mode_config.mutex);
+	return ret;
+}