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>
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.c b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
new file mode 100644
index 0000000..33d30c1
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * 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_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem.h>
+#include <linux/dma-buf.h>
+#include <linux/reservation.h>
+
+#include "mtk_drm_drv.h"
+#include "mtk_drm_fb.h"
+#include "mtk_drm_gem.h"
+
+/*
+ * mtk specific framebuffer structure.
+ *
+ * @fb: drm framebuffer object.
+ * @gem_obj: array of gem objects.
+ */
+struct mtk_drm_fb {
+ struct drm_framebuffer base;
+ /* For now we only support a single plane */
+ struct drm_gem_object *gem_obj;
+};
+
+#define to_mtk_fb(x) container_of(x, struct mtk_drm_fb, base)
+
+struct drm_gem_object *mtk_fb_get_gem_obj(struct drm_framebuffer *fb)
+{
+ struct mtk_drm_fb *mtk_fb = to_mtk_fb(fb);
+
+ return mtk_fb->gem_obj;
+}
+
+static int mtk_drm_fb_create_handle(struct drm_framebuffer *fb,
+ struct drm_file *file_priv,
+ unsigned int *handle)
+{
+ struct mtk_drm_fb *mtk_fb = to_mtk_fb(fb);
+
+ return drm_gem_handle_create(file_priv, mtk_fb->gem_obj, handle);
+}
+
+static void mtk_drm_fb_destroy(struct drm_framebuffer *fb)
+{
+ struct mtk_drm_fb *mtk_fb = to_mtk_fb(fb);
+
+ drm_framebuffer_cleanup(fb);
+
+ drm_gem_object_unreference_unlocked(mtk_fb->gem_obj);
+
+ kfree(mtk_fb);
+}
+
+static const struct drm_framebuffer_funcs mtk_drm_fb_funcs = {
+ .create_handle = mtk_drm_fb_create_handle,
+ .destroy = mtk_drm_fb_destroy,
+};
+
+static struct mtk_drm_fb *mtk_drm_framebuffer_init(struct drm_device *dev,
+ const struct drm_mode_fb_cmd2 *mode,
+ struct drm_gem_object *obj)
+{
+ struct mtk_drm_fb *mtk_fb;
+ int ret;
+
+ if (drm_format_num_planes(mode->pixel_format) != 1)
+ return ERR_PTR(-EINVAL);
+
+ mtk_fb = kzalloc(sizeof(*mtk_fb), GFP_KERNEL);
+ if (!mtk_fb)
+ return ERR_PTR(-ENOMEM);
+
+ drm_helper_mode_fill_fb_struct(&mtk_fb->base, mode);
+
+ mtk_fb->gem_obj = obj;
+
+ ret = drm_framebuffer_init(dev, &mtk_fb->base, &mtk_drm_fb_funcs);
+ if (ret) {
+ DRM_ERROR("failed to initialize framebuffer\n");
+ kfree(mtk_fb);
+ return ERR_PTR(ret);
+ }
+
+ return mtk_fb;
+}
+
+/*
+ * Wait for any exclusive fence in fb's gem object's reservation object.
+ *
+ * Returns -ERESTARTSYS if interrupted, else 0.
+ */
+int mtk_fb_wait(struct drm_framebuffer *fb)
+{
+ struct drm_gem_object *gem;
+ struct reservation_object *resv;
+ long ret;
+
+ if (!fb)
+ return 0;
+
+ gem = mtk_fb_get_gem_obj(fb);
+ if (!gem || !gem->dma_buf || !gem->dma_buf->resv)
+ return 0;
+
+ resv = gem->dma_buf->resv;
+ ret = reservation_object_wait_timeout_rcu(resv, false, true,
+ MAX_SCHEDULE_TIMEOUT);
+ /* MAX_SCHEDULE_TIMEOUT on success, -ERESTARTSYS if interrupted */
+ if (WARN_ON(ret < 0))
+ return ret;
+
+ return 0;
+}
+
+struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
+ struct drm_file *file,
+ const struct drm_mode_fb_cmd2 *cmd)
+{
+ struct mtk_drm_fb *mtk_fb;
+ struct drm_gem_object *gem;
+ unsigned int width = cmd->width;
+ unsigned int height = cmd->height;
+ unsigned int size, bpp;
+ int ret;
+
+ if (drm_format_num_planes(cmd->pixel_format) != 1)
+ return ERR_PTR(-EINVAL);
+
+ gem = drm_gem_object_lookup(dev, file, cmd->handles[0]);
+ if (!gem)
+ return ERR_PTR(-ENOENT);
+
+ bpp = drm_format_plane_cpp(cmd->pixel_format, 0);
+ size = (height - 1) * cmd->pitches[0] + width * bpp;
+ size += cmd->offsets[0];
+
+ if (gem->size < size) {
+ ret = -EINVAL;
+ goto unreference;
+ }
+
+ mtk_fb = mtk_drm_framebuffer_init(dev, cmd, gem);
+ if (IS_ERR(mtk_fb)) {
+ ret = PTR_ERR(mtk_fb);
+ goto unreference;
+ }
+
+ return &mtk_fb->base;
+
+unreference:
+ drm_gem_object_unreference_unlocked(gem);
+ return ERR_PTR(ret);
+}