drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.

This patch adds an initial DRM driver for the Mediatek MT8173 DISP
subsystem. It currently supports two fixed output streams from the
OVL0/OVL1 sources to the DSI0/DPI0 sinks, respectively.

Signed-off-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: YT Shen <yt.shen@mediatek.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Signed-off-by: Mao Huang <littlecvr@chromium.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 240 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
new file mode 100644
index 000000000000..c898788f3dd3
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
@@ -0,0 +1,240 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: CK Hu <ck.hu@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+
+#include "mtk_drm_crtc.h"
+#include "mtk_drm_ddp_comp.h"
+#include "mtk_drm_drv.h"
+#include "mtk_drm_fb.h"
+#include "mtk_drm_gem.h"
+#include "mtk_drm_plane.h"
+
+static const u32 formats[] = {
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_ARGB8888,
+	DRM_FORMAT_RGB565,
+};
+
+static void mtk_plane_enable(struct mtk_drm_plane *mtk_plane, bool enable,
+			     dma_addr_t addr, struct drm_rect *dest)
+{
+	struct drm_plane *plane = &mtk_plane->base;
+	struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
+	unsigned int pitch, format;
+	int x, y;
+
+	if (WARN_ON(!plane->state || (enable && !plane->state->fb)))
+		return;
+
+	if (plane->state->fb) {
+		pitch = plane->state->fb->pitches[0];
+		format = plane->state->fb->pixel_format;
+	} else {
+		pitch = 0;
+		format = DRM_FORMAT_RGBA8888;
+	}
+
+	x = plane->state->crtc_x;
+	y = plane->state->crtc_y;
+
+	if (x < 0) {
+		addr -= x * 4;
+		x = 0;
+	}
+
+	if (y < 0) {
+		addr -= y * pitch;
+		y = 0;
+	}
+
+	state->pending.enable = enable;
+	state->pending.pitch = pitch;
+	state->pending.format = format;
+	state->pending.addr = addr;
+	state->pending.x = x;
+	state->pending.y = y;
+	state->pending.width = dest->x2 - dest->x1;
+	state->pending.height = dest->y2 - dest->y1;
+	wmb(); /* Make sure the above parameters are set before update */
+	state->pending.dirty = true;
+}
+
+static void mtk_plane_reset(struct drm_plane *plane)
+{
+	struct mtk_plane_state *state;
+
+	if (plane->state) {
+		if (plane->state->fb)
+			drm_framebuffer_unreference(plane->state->fb);
+
+		state = to_mtk_plane_state(plane->state);
+		memset(state, 0, sizeof(*state));
+	} else {
+		state = kzalloc(sizeof(*state), GFP_KERNEL);
+		if (!state)
+			return;
+		plane->state = &state->base;
+	}
+
+	state->base.plane = plane;
+	state->pending.format = DRM_FORMAT_RGB565;
+}
+
+static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
+{
+	struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
+	struct mtk_plane_state *state;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return NULL;
+
+	__drm_atomic_helper_plane_duplicate_state(plane, &state->base);
+
+	WARN_ON(state->base.plane != plane);
+
+	state->pending = old_state->pending;
+
+	return &state->base;
+}
+
+static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
+					struct drm_plane_state *state)
+{
+	__drm_atomic_helper_plane_destroy_state(plane, state);
+	kfree(to_mtk_plane_state(state));
+}
+
+static const struct drm_plane_funcs mtk_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	.reset = mtk_plane_reset,
+	.atomic_duplicate_state = mtk_plane_duplicate_state,
+	.atomic_destroy_state = mtk_drm_plane_destroy_state,
+};
+
+static int mtk_plane_atomic_check(struct drm_plane *plane,
+				  struct drm_plane_state *state)
+{
+	struct drm_framebuffer *fb = state->fb;
+	struct drm_crtc_state *crtc_state;
+	bool visible;
+	struct drm_rect dest = {
+		.x1 = state->crtc_x,
+		.y1 = state->crtc_y,
+		.x2 = state->crtc_x + state->crtc_w,
+		.y2 = state->crtc_y + state->crtc_h,
+	};
+	struct drm_rect src = {
+		/* 16.16 fixed point */
+		.x1 = state->src_x,
+		.y1 = state->src_y,
+		.x2 = state->src_x + state->src_w,
+		.y2 = state->src_y + state->src_h,
+	};
+	struct drm_rect clip = { 0, };
+
+	if (!fb)
+		return 0;
+
+	if (!mtk_fb_get_gem_obj(fb)) {
+		DRM_DEBUG_KMS("buffer is null\n");
+		return -EFAULT;
+	}
+
+	if (!state->crtc)
+		return 0;
+
+	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+
+	clip.x2 = crtc_state->mode.hdisplay;
+	clip.y2 = crtc_state->mode.vdisplay;
+
+	return drm_plane_helper_check_update(plane, state->crtc, fb,
+					     &src, &dest, &clip,
+					     DRM_PLANE_HELPER_NO_SCALING,
+					     DRM_PLANE_HELPER_NO_SCALING,
+					     true, true, &visible);
+}
+
+static void mtk_plane_atomic_update(struct drm_plane *plane,
+				    struct drm_plane_state *old_state)
+{
+	struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
+	struct drm_crtc *crtc = state->base.crtc;
+	struct drm_gem_object *gem;
+	struct mtk_drm_gem_obj *mtk_gem;
+	struct mtk_drm_plane *mtk_plane = to_mtk_plane(plane);
+	struct drm_rect dest = {
+		.x1 = state->base.crtc_x,
+		.y1 = state->base.crtc_y,
+		.x2 = state->base.crtc_x + state->base.crtc_w,
+		.y2 = state->base.crtc_y + state->base.crtc_h,
+	};
+	struct drm_rect clip = { 0, };
+
+	if (!crtc)
+		return;
+
+	clip.x2 = state->base.crtc->state->mode.hdisplay;
+	clip.y2 = state->base.crtc->state->mode.vdisplay;
+	drm_rect_intersect(&dest, &clip);
+
+	gem = mtk_fb_get_gem_obj(state->base.fb);
+	mtk_gem = to_mtk_gem_obj(gem);
+	mtk_plane_enable(mtk_plane, true, mtk_gem->dma_addr, &dest);
+}
+
+static void mtk_plane_atomic_disable(struct drm_plane *plane,
+				     struct drm_plane_state *old_state)
+{
+	struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
+
+	state->pending.enable = false;
+	wmb(); /* Make sure the above parameter is set before update */
+	state->pending.dirty = true;
+}
+
+static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
+	.atomic_check = mtk_plane_atomic_check,
+	.atomic_update = mtk_plane_atomic_update,
+	.atomic_disable = mtk_plane_atomic_disable,
+};
+
+int mtk_plane_init(struct drm_device *dev, struct mtk_drm_plane *mtk_plane,
+		   unsigned long possible_crtcs, enum drm_plane_type type,
+		   unsigned int zpos)
+{
+	int err;
+
+	err = drm_universal_plane_init(dev, &mtk_plane->base, possible_crtcs,
+				       &mtk_plane_funcs, formats,
+				       ARRAY_SIZE(formats), type, NULL);
+	if (err) {
+		DRM_ERROR("failed to initialize plane\n");
+		return err;
+	}
+
+	drm_plane_helper_add(&mtk_plane->base, &mtk_plane_helper_funcs);
+	mtk_plane->idx = zpos;
+
+	return 0;
+}