Just a hack to test the client API.
Signed-off-by: Noralf Trønnes <nor...@tronnes.org>
---
drivers/gpu/drm/client/Kconfig | 5 +
drivers/gpu/drm/client/Makefile | 1 +
drivers/gpu/drm/client/drm_bootsplash.c | 205 ++++++++++++++++++++++++++++++++
3 files changed, 211 insertions(+)
create mode 100644 drivers/gpu/drm/client/drm_bootsplash.c
diff --git a/drivers/gpu/drm/client/Kconfig b/drivers/gpu/drm/client/Kconfig
index 73902ab44c75..16cf1e14620a 100644
--- a/drivers/gpu/drm/client/Kconfig
+++ b/drivers/gpu/drm/client/Kconfig
@@ -17,4 +17,9 @@ config DRM_CLIENT_FBDEV
help
Generic fbdev emulation
+config DRM_CLIENT_BOOTSPLASH
+ tristate "DRM Bootsplash"
+ help
+ DRM Bootsplash
+
endmenu
diff --git a/drivers/gpu/drm/client/Makefile b/drivers/gpu/drm/client/Makefile
index 3ff694429dec..8660530e4646 100644
--- a/drivers/gpu/drm/client/Makefile
+++ b/drivers/gpu/drm/client/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_CLIENT_FBDEV) += drm_fbdev.o
+obj-$(CONFIG_DRM_CLIENT_BOOTSPLASH) += drm_bootsplash.o
diff --git a/drivers/gpu/drm/client/drm_bootsplash.c
b/drivers/gpu/drm/client/drm_bootsplash.c
new file mode 100644
index 000000000000..43c703606e74
--- /dev/null
+++ b/drivers/gpu/drm/client/drm_bootsplash.c
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include <drm/drm_client.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+
+struct drm_bootsplash {
+ struct drm_client_dev *client;
+ struct drm_client_display *display;
+ struct drm_client_buffer *buffer[2];
+ struct work_struct worker;
+ bool stop;
+};
+
+static u32 drm_bootsplash_color_table[3] = {
+ 0x00ff0000, 0x0000ff00, 0x000000ff,
+};
+
+/* Draw a box with changing colors */
+static void
+drm_bootsplash_draw(struct drm_client_buffer *buffer, unsigned int sequence)
+{
+ unsigned int x, y;
+ u32 *pix;
+
+ pix = buffer->vaddr;
+ pix += ((buffer->height / 2) - 50) * buffer->width;
+ pix += (buffer->width / 2) - 50;
+
+ for (y = 0; y < 100; y++) {
+ for (x = 0; x < 100; x++)
+ *pix++ = drm_bootsplash_color_table[sequence];
+ pix += buffer->width - 100;
+ }
+}
+
+static void drm_bootsplash_worker(struct work_struct *work)
+{
+ struct drm_bootsplash *splash = container_of(work, struct
drm_bootsplash,
+ worker);
+ struct drm_event *event;
+ unsigned int i = 0, sequence = 0, fb_id;
+ int ret;
+
+ while (!splash->stop) {
+ /* Are we still in charge? */
+ fb_id = drm_client_display_current_fb(splash->display);
+ if (fb_id != splash->buffer[i]->fb_ids[0])
+ break;
+
+ /*
+ * We can race with userspace here between checking and doing
+ * the page flip, so double buffering isn't such a good idea.
+ * Tearing probably isn't a problem on a presumably small splash
+ * animation. I've kept it to test the page flip code.
+ */
+
+ i = !i;
+ drm_bootsplash_draw(splash->buffer[i], sequence++);
+ if (sequence == 3)
+ sequence = 0;
+
+ ret = drm_client_display_page_flip(splash->display,
+ splash->buffer[i]->fb_ids[0],
+ true);
+ if (!ret) {
+ event = drm_client_read_event(splash->client, true);
+ if (!IS_ERR(event))
+ kfree(event);
+ }
+ msleep(500);
+ }
+
+ for (i = 0; i < 2; i++)
+ drm_client_framebuffer_delete(splash->buffer[i]);
+ drm_client_display_free(splash->display);
+}
+
+static int drm_bootsplash_setup(struct drm_bootsplash *splash)
+{
+ struct drm_client_dev *client = splash->client;
+ struct drm_client_buffer *buffer[2];
+ struct drm_client_display *display;
+ struct drm_mode_modeinfo *mode;
+ int ret, i;
+
+ display = drm_client_display_get_first_enabled(client, false);
+ if (IS_ERR(display))
+ return PTR_ERR(display);
+ if (!display)
+ return -ENOENT;
+
+ mode = drm_client_display_first_mode(display);
+ if (!mode) {
+ ret = -EINVAL;
+ goto err_free_display;
+ }
+
+ for (i = 0; i < 2; i++) {
+ buffer[i] = drm_client_framebuffer_create(client, mode,
+ DRM_FORMAT_XRGB8888);
+ if (IS_ERR(buffer[i])) {
+ ret = PTR_ERR(buffer[i]);
+ goto err_free_buffer;
+ }
+ }
+
+ ret = drm_client_display_commit_mode(display, buffer[0]->fb_ids[0],
mode);
+ if (ret)
+ goto err_free_buffer;
+
+ splash->display = display;
+ splash->buffer[0] = buffer[0];
+ splash->buffer[1] = buffer[1];
+
+ schedule_work(&splash->worker);
+
+ return 0;
+
+err_free_buffer:
+ for (i--; i >= 0; i--)
+ drm_client_framebuffer_delete(buffer[i]);
+err_free_display:
+ drm_client_display_free(display);
+
+ return ret;
+}
+
+static int drm_bootsplash_client_hotplug(struct drm_client_dev *client)
+{
+ struct drm_bootsplash *splash = client->private;
+ int ret = 0;
+
+ if (!splash->display)
+ ret = drm_bootsplash_setup(splash);
+
+ return ret;
+}
+
+static int drm_bootsplash_client_new(struct drm_client_dev *client)
+{
+ struct drm_bootsplash *splash;
+
+ splash = kzalloc(sizeof(*splash), GFP_KERNEL);
+ if (!splash)
+ return -ENOMEM;
+
+ INIT_WORK(&splash->worker, drm_bootsplash_worker);
+
+ splash->client = client;
+ client->private = splash;
+
+ /*
+ * vc4 isn't done with it's setup when drm_dev_register() is called.
+ * It should have shouldn't it?
+ * So to keep it from crashing defer setup to hotplug...
+ */
+ if (client->dev->mode_config.max_width)
+ drm_bootsplash_client_hotplug(client);
+
+ return 0;
+}
+
+static int drm_bootsplash_client_remove(struct drm_client_dev *client)
+{
+ struct drm_bootsplash *splash = client->private;
+
+ if (splash->display) {
+ splash->stop = true;
+ flush_work(&splash->worker);
+ }
+
+ kfree(splash);
+
+ return 0;
+}
+
+static const struct drm_client_funcs drm_bootsplash_client_funcs = {
+ .name = "drm_bootsplash",
+ .new = drm_bootsplash_client_new,
+ .remove = drm_bootsplash_client_remove,
+ .hotplug = drm_bootsplash_client_hotplug,
+};
+
+static int __init drm_bootsplash_init(void)
+{
+ return drm_client_register(&drm_bootsplash_client_funcs);
+}
+module_init(drm_bootsplash_init);
+
+static void __exit drm_bootsplash_exit(void)
+{
+ drm_client_unregister(&drm_bootsplash_client_funcs);
+}
+module_exit(drm_bootsplash_exit);
+
+MODULE_LICENSE("GPL");
--
2.15.1
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