[PATCH v2 12/12] drm/client: Hack: Add bootsplash example
Noralf Trønnes
noralf at tronnes.org
Sun Apr 7 16:52:43 UTC 2019
An example to showcase the client API.
TODO:
A bootsplash client needs a way to tell drm_fb_helper to stay away,
otherwise it will chime in on setup and hotplug.
Most DRM drivers register fbdev before calling drm_dev_register() (the
generic emulation is an exception). This have to be reversed for
bootsplash to fend off fbdev.
Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
---
drivers/gpu/drm/Kconfig | 5 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_bootsplash.c | 359 +++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_client.c | 7 +
drivers/gpu/drm/drm_drv.c | 4 +
include/drm/drm_client.h | 3 +
6 files changed, 379 insertions(+)
create mode 100644 drivers/gpu/drm/drm_bootsplash.c
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 98e9ac8498c0..d61de804068a 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -65,6 +65,11 @@ config DRM_DEBUG_SELFTEST
If in doubt, say "N".
+config DRM_CLIENT_BOOTSPLASH
+ bool "DRM Bootsplash"
+ help
+ DRM Bootsplash
+
config DRM_KMS_HELPER
tristate
depends on DRM
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 08c77c10ccbb..ae42c9a91c57 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -32,6 +32,7 @@ drm-$(CONFIG_OF) += drm_of.o
drm-$(CONFIG_AGP) += drm_agpsupport.o
drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o
drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
+drm-$(CONFIG_DRM_CLIENT_BOOTSPLASH) += drm_bootsplash.o
drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_dsc.o drm_probe_helper.o \
drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
diff --git a/drivers/gpu/drm/drm_bootsplash.c b/drivers/gpu/drm/drm_bootsplash.c
new file mode 100644
index 000000000000..37f3ac3fce95
--- /dev/null
+++ b/drivers/gpu/drm/drm_bootsplash.c
@@ -0,0 +1,359 @@
+/* DRM internal client example */
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/keyboard.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include <drm/drm_client.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+
+// drm_lastclose()
+#include "drm_internal.h"
+
+static bool drm_bootsplash_enabled = true;
+module_param_named(bootsplash_enabled, drm_bootsplash_enabled, bool, 0600);
+MODULE_PARM_DESC(bootsplash_enabled, "Enable bootsplash client [default=true]");
+
+struct drm_bootsplash {
+ struct drm_client_dev client;
+ struct mutex lock;
+ struct work_struct worker;
+ bool started;
+ bool stop;
+
+ unsigned int modeset_mask;
+ struct drm_client_buffer *buffers[2];
+};
+
+static bool drm_bootsplash_key_pressed;
+
+static int drm_bootsplash_keyboard_notifier_call(struct notifier_block *blk,
+ unsigned long code, void *_param)
+{
+ /* Any key is good */
+ drm_bootsplash_key_pressed = true;
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block drm_bootsplash_keyboard_notifier_block = {
+ .notifier_call = drm_bootsplash_keyboard_notifier_call,
+};
+
+static void drm_bootsplash_buffer_delete(struct drm_bootsplash *splash)
+{
+ unsigned int i;
+
+ for (i = 0; i < 2; i++) {
+ if (!IS_ERR_OR_NULL(splash->buffers[i]))
+ drm_client_framebuffer_delete(splash->buffers[i]);
+ splash->buffers[i] = NULL;
+ }
+}
+
+static int drm_bootsplash_buffer_create(struct drm_bootsplash *splash, u32 width, u32 height)
+{
+ unsigned int i;
+
+ for (i = 0; i < 2; i++) {
+ splash->buffers[i] = drm_client_framebuffer_create(&splash->client, width, height, DRM_FORMAT_XRGB8888);
+ if (IS_ERR(splash->buffers[i])) {
+ drm_bootsplash_buffer_delete(splash);
+ return PTR_ERR(splash->buffers[i]);
+ }
+ }
+
+ return 0;
+}
+
+static int drm_bootsplash_display_probe(struct drm_bootsplash *splash)
+{
+ struct drm_client_dev *client = &splash->client;
+ unsigned int width = 0, height = 0;
+ unsigned int num_non_tiled = 0, i;
+ struct drm_mode_set *modeset;
+ bool tiled = false;
+ int ret;
+
+ splash->modeset_mask = 0;
+
+ ret = drm_client_modeset_probe(client, 0, 0);
+ if (ret)
+ return ret;
+
+ mutex_lock(&client->modeset_mutex);
+
+ drm_client_for_each_modeset(modeset, client) {
+ if (!modeset->mode)
+ continue;
+
+ if (modeset->connectors[0]->has_tile)
+ tiled = true;
+ else
+ num_non_tiled++;
+ }
+
+ if (!tiled && !num_non_tiled) {
+ drm_bootsplash_buffer_delete(splash);
+ ret = -ENOENT;
+ goto out;
+ }
+
+ /* Assume only one tiled monitor is possible */
+ if (tiled) {
+ int hdisplay = 0, vdisplay = 0;
+
+ i = 0;
+ drm_client_for_each_modeset(modeset, client) {
+ i++;
+ if (!modeset->connectors[0]->has_tile)
+ continue;
+
+ if (!modeset->y)
+ hdisplay += modeset->mode->hdisplay;
+ if (!modeset->x)
+ vdisplay += modeset->mode->vdisplay;
+ splash->modeset_mask |= BIT(i - 1);
+ }
+
+ width = hdisplay;
+ height = vdisplay;
+
+ goto trim;
+ }
+
+ /* The rest have one display per modeset, pick the largest */
+ i = 0;
+ drm_client_for_each_modeset(modeset, client) {
+ i++;
+ if (!modeset->mode || modeset->connectors[0]->has_tile)
+ continue;
+
+ if (modeset->mode->hdisplay * modeset->mode->vdisplay > width * height) {
+ width = modeset->mode->hdisplay;
+ height = modeset->mode->vdisplay;
+ splash->modeset_mask = BIT(i - 1);
+ }
+ }
+
+trim:
+ /* Remove unused modesets (warning in __drm_atomic_helper_set_config()) */
+ i = 0;
+ drm_client_for_each_modeset(modeset, client) {
+ unsigned int j;
+
+ if (splash->modeset_mask & BIT(i++))
+ continue;
+
+ drm_mode_destroy(client->dev, modeset->mode);
+ modeset->mode = NULL;
+
+ for (j = 0; j < modeset->num_connectors; j++) {
+ drm_connector_put(modeset->connectors[j]);
+ modeset->connectors[j] = NULL;
+ }
+ modeset->num_connectors = 0;
+ }
+
+ if (!splash->buffers[0] ||
+ splash->buffers[0]->fb->width != width || splash->buffers[0]->fb->height != height) {
+ drm_bootsplash_buffer_delete(splash);
+ ret = drm_bootsplash_buffer_create(splash, width, height);
+ }
+
+out:
+ mutex_unlock(&client->modeset_mutex);
+
+ return ret;
+}
+
+static int drm_bootsplash_display_commit_buffer(struct drm_bootsplash *splash, unsigned int num)
+{
+ struct drm_mode_set *modeset;
+ unsigned int i = 0;
+
+ drm_client_for_each_modeset(modeset, &splash->client) {
+ if (splash->modeset_mask & BIT(i++))
+ modeset->fb = splash->buffers[num]->fb;
+ }
+
+ return drm_client_modeset_commit(&splash->client);
+}
+
+static u32 drm_bootsplash_color_table[3] = {
+ 0x00ff0000, 0x0000ff00, 0x000000ff,
+};
+
+/* Draw a box with changing colors */
+static void drm_bootsplash_draw_box(struct drm_client_buffer *buffer, unsigned int sequence)
+{
+ unsigned int width = buffer->fb->width;
+ unsigned int height = buffer->fb->height;
+ unsigned int x, y;
+ u32 *pix;
+
+ pix = buffer->vaddr;
+ pix += ((height / 2) - 50) * width;
+ pix += (width / 2) - 50;
+
+ for (y = 0; y < 100; y++) {
+ for (x = 0; x < 100; x++)
+ *pix++ = drm_bootsplash_color_table[sequence];
+ pix += width - 100;
+ }
+}
+
+static int drm_bootsplash_draw(struct drm_bootsplash *splash, unsigned int sequence, unsigned int buffer_num)
+{
+ if (!splash->buffers[buffer_num])
+ return -ENOENT;
+
+ DRM_DEBUG_KMS("draw: buffer_num=%u, sequence=%u\n", buffer_num, sequence);
+
+ drm_bootsplash_draw_box(splash->buffers[buffer_num], sequence);
+
+ return drm_bootsplash_display_commit_buffer(splash, buffer_num);
+}
+
+static void drm_bootsplash_worker(struct work_struct *work)
+{
+ struct drm_bootsplash *splash = container_of(work, struct drm_bootsplash, worker);
+ struct drm_client_dev *client = &splash->client;
+ struct drm_device *dev = client->dev;
+ unsigned int buffer_num = 0, sequence = 0;
+ bool stop = false;
+ int ret = 0;
+
+ while (!drm_bootsplash_key_pressed) {
+ mutex_lock(&splash->lock);
+
+ stop = splash->stop;
+
+ buffer_num = !buffer_num;
+
+ ret = drm_bootsplash_draw(splash, sequence, buffer_num);
+
+ mutex_unlock(&splash->lock);
+
+ if (stop || ret == -ENOENT || ret == -EBUSY)
+ break;
+
+ if (++sequence == 3)
+ sequence = 0;
+
+ msleep(500);
+ }
+
+ /* Restore fbdev (or other) on key press. */
+ /* TODO: Check if it's OK to call drm_lastclose here. */
+ if (drm_bootsplash_key_pressed && !splash->stop)
+ drm_lastclose(dev);
+
+ drm_bootsplash_buffer_delete(splash);
+
+ DRM_DEV_DEBUG_KMS(dev->dev, "Bootsplash has stopped (key=%u stop=%u, ret=%d).\n",
+ drm_bootsplash_key_pressed, splash->stop, ret);
+}
+
+static int drm_bootsplash_client_hotplug(struct drm_client_dev *client)
+{
+ struct drm_bootsplash *splash = container_of(client, struct drm_bootsplash, client);
+ int ret = 0;
+
+ if (drm_bootsplash_key_pressed)
+ return 0;
+
+ mutex_lock(&splash->lock);
+
+ if (splash->stop)
+ goto out_unlock;
+
+ ret = drm_bootsplash_display_probe(splash);
+ if (ret < 0) {
+ if (splash->started && ret == -ENOENT)
+ splash->stop = true;
+ goto out_unlock;
+ }
+
+ /*
+ * TODO: Deal with rotated panels, might have to sw rotate
+ if (drm_client_panel_rotation(...))
+ */
+
+ if (!splash->started) {
+ splash->started = true;
+ schedule_work(&splash->worker);
+ }
+
+out_unlock:
+ mutex_unlock(&splash->lock);
+
+ return ret;
+}
+
+static void drm_bootsplash_client_unregister(struct drm_client_dev *client)
+{
+ struct drm_bootsplash *splash = container_of(client, struct drm_bootsplash, client);
+
+ DRM_DEBUG_KMS("%s: IN\n", __func__);
+
+ mutex_lock(&splash->lock);
+ splash->stop = true;
+ mutex_unlock(&splash->lock);
+
+ flush_work(&splash->worker);
+
+ drm_client_release(client);
+ kfree(splash);
+
+ unregister_keyboard_notifier(&drm_bootsplash_keyboard_notifier_block);
+
+ DRM_DEBUG_KMS("%s: OUT\n", __func__);
+}
+
+static const struct drm_client_funcs drm_bootsplash_client_funcs = {
+ .owner = THIS_MODULE,
+ .unregister = drm_bootsplash_client_unregister,
+ .hotplug = drm_bootsplash_client_hotplug,
+};
+
+void drm_bootsplash_client_register(struct drm_device *dev)
+{
+ struct drm_bootsplash *splash;
+ int ret;
+
+ if (!drm_bootsplash_enabled)
+ return;
+
+ splash = kzalloc(sizeof(*splash), GFP_KERNEL);
+ if (!splash)
+ return;
+
+ ret = drm_client_init(dev, &splash->client, "bootsplash", &drm_bootsplash_client_funcs);
+ if (ret) {
+ DRM_DEV_ERROR(dev->dev, "Failed to create client, ret=%d\n", ret);
+ kfree(splash);
+ return;
+ }
+
+ /* For this simple example only allow the first */
+ drm_bootsplash_enabled = false;
+
+ mutex_init(&splash->lock);
+
+ INIT_WORK(&splash->worker, drm_bootsplash_worker);
+
+ drm_client_add(&splash->client);
+
+ register_keyboard_notifier(&drm_bootsplash_keyboard_notifier_block);
+
+ drm_bootsplash_client_hotplug(&splash->client);
+}
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 3ad5b57c1419..1f9eb28a27e5 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -162,6 +162,13 @@ void drm_client_release(struct drm_client_dev *client)
}
EXPORT_SYMBOL(drm_client_release);
+void drm_client_dev_register(struct drm_device *dev)
+{
+#if CONFIG_DRM_CLIENT_BOOTSPLASH
+ drm_bootsplash_client_register(dev);
+#endif
+}
+
void drm_client_dev_unregister(struct drm_device *dev)
{
struct drm_client_dev *client, *tmp;
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 50d849d1bc6e..fbbb5f998baf 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -1018,6 +1018,10 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
drm_minor_unregister(dev, DRM_MINOR_RENDER);
out_unlock:
mutex_unlock(&drm_global_mutex);
+
+ if (!ret)
+ drm_client_dev_register(dev);
+
return ret;
}
EXPORT_SYMBOL(drm_dev_register);
diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h
index 515f0f783ff8..ac72fa514e67 100644
--- a/include/drm/drm_client.h
+++ b/include/drm/drm_client.h
@@ -106,6 +106,7 @@ int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
void drm_client_release(struct drm_client_dev *client);
void drm_client_add(struct drm_client_dev *client);
+void drm_client_dev_register(struct drm_device *dev);
void drm_client_dev_unregister(struct drm_device *dev);
void drm_client_dev_hotplug(struct drm_device *dev);
void drm_client_dev_restore(struct drm_device *dev);
@@ -182,4 +183,6 @@ int drm_client_modeset_dpms(struct drm_client_dev *client, int mode);
int drm_client_debugfs_init(struct drm_minor *minor);
+void drm_bootsplash_client_register(struct drm_device *dev);
+
#endif
--
2.20.1
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