[RFC v4 24/25] drm/client: Hack: Add bootsplash

[Noralf Trønnes]

A hack to test the client API.

Signed-off-by: Noralf Trønnes 
---
 drivers/gpu/drm/Kconfig |   2 +
 drivers/gpu/drm/Makefile|   1 +
 drivers/gpu/drm/client/Kconfig  |   9 ++
 drivers/gpu/drm/client/drm_bootsplash.c | 248 
 drivers/gpu/drm/client/internal.h   |  19 +++
 drivers/gpu/drm/drm_client.c|   4 +
 6 files changed, 283 insertions(+)
 create mode 100644 drivers/gpu/drm/client/Kconfig
 create mode 100644 drivers/gpu/drm/client/drm_bootsplash.c
 create mode 100644 drivers/gpu/drm/client/internal.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 757825ac60df..1328202ce17d 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -154,6 +154,8 @@ config DRM_SCHED
tristate
depends on DRM
 
+source "drivers/gpu/drm/client/Kconfig"
+
 source "drivers/gpu/drm/i2c/Kconfig"
 
 source "drivers/gpu/drm/arm/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index d25afa136d8f..388527093f80 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -30,6 +30,7 @@ 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) += client/drm_bootsplash.o
 
 drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
diff --git a/drivers/gpu/drm/client/Kconfig b/drivers/gpu/drm/client/Kconfig
new file mode 100644
index ..6b01f2e51fb3
--- /dev/null
+++ b/drivers/gpu/drm/client/Kconfig
@@ -0,0 +1,9 @@
+menu "DRM Clients"
+   depends on DRM
+
+config DRM_CLIENT_BOOTSPLASH
+   bool "DRM Bootsplash"
+   help
+ DRM Bootsplash
+
+endmenu
diff --git a/drivers/gpu/drm/client/drm_bootsplash.c 
b/drivers/gpu/drm/client/drm_bootsplash.c
new file mode 100644
index ..bec3105f9b02
--- /dev/null
+++ b/drivers/gpu/drm/client/drm_bootsplash.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+// drm_lastclose()
+#include 
+#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 drm_client_display *display;
+   struct drm_client_buffer *buffer[2];
+   struct work_struct worker;
+   bool stop;
+};
+
+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 u32 drm_bootsplash_color_table[3] = {
+   0x00ff, 0xff00, 0x00ff,
+};
+
+/* 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_device *dev = splash->client->dev;
+   unsigned int i = 0, sequence = 0;
+   struct drm_framebuffer *fb;
+   int ret = 0;
+
+   while (!splash->stop && !drm_bootsplash_key_pressed) {
+   /* Did someone take over, like another in-kernel client, except 
fbdev? */
+   fb = drm_client_display_current_fb(splash->display);
+   if (splash->buffer[i]->fb != fb &&
+   !(dev->fb_helper && dev->fb_helper->fb == fb))
+   break;
+
+   i = !i;
+   drm_bootsplash_draw(splash->buffer[i], sequence++);
+   if (sequence == 3)
+   sequence = 0;
+
+   ret = drm_client_display_commit(splash->display, 
splash->buffer[i]->fb, NULL);
+   /* Is userspace in charge or is the device unplugged? */
+   if (ret == -EBUSY || ret == -ENODEV)
+   break;
+
+   msleep(500);
+ 

[RFC v4 24/25] drm/client: Hack: Add bootsplash

[Noralf Trønnes]

A hack to test the client API.

Signed-off-by: Noralf Trønnes 
---
 drivers/gpu/drm/Kconfig |   2 +
 drivers/gpu/drm/Makefile|   1 +
 drivers/gpu/drm/client/Kconfig  |   9 ++
 drivers/gpu/drm/client/drm_bootsplash.c | 248 
 drivers/gpu/drm/client/internal.h   |  19 +++
 drivers/gpu/drm/drm_client.c|   4 +
 6 files changed, 283 insertions(+)
 create mode 100644 drivers/gpu/drm/client/Kconfig
 create mode 100644 drivers/gpu/drm/client/drm_bootsplash.c
 create mode 100644 drivers/gpu/drm/client/internal.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 757825ac60df..1328202ce17d 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -154,6 +154,8 @@ config DRM_SCHED
tristate
depends on DRM
 
+source "drivers/gpu/drm/client/Kconfig"
+
 source "drivers/gpu/drm/i2c/Kconfig"
 
 source "drivers/gpu/drm/arm/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index d25afa136d8f..388527093f80 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -30,6 +30,7 @@ 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) += client/drm_bootsplash.o
 
 drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
diff --git a/drivers/gpu/drm/client/Kconfig b/drivers/gpu/drm/client/Kconfig
new file mode 100644
index ..6b01f2e51fb3
--- /dev/null
+++ b/drivers/gpu/drm/client/Kconfig
@@ -0,0 +1,9 @@
+menu "DRM Clients"
+   depends on DRM
+
+config DRM_CLIENT_BOOTSPLASH
+   bool "DRM Bootsplash"
+   help
+ DRM Bootsplash
+
+endmenu
diff --git a/drivers/gpu/drm/client/drm_bootsplash.c 
b/drivers/gpu/drm/client/drm_bootsplash.c
new file mode 100644
index ..bec3105f9b02
--- /dev/null
+++ b/drivers/gpu/drm/client/drm_bootsplash.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+// drm_lastclose()
+#include 
+#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 drm_client_display *display;
+   struct drm_client_buffer *buffer[2];
+   struct work_struct worker;
+   bool stop;
+};
+
+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 u32 drm_bootsplash_color_table[3] = {
+   0x00ff, 0xff00, 0x00ff,
+};
+
+/* 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_device *dev = splash->client->dev;
+   unsigned int i = 0, sequence = 0;
+   struct drm_framebuffer *fb;
+   int ret = 0;
+
+   while (!splash->stop && !drm_bootsplash_key_pressed) {
+   /* Did someone take over, like another in-kernel client, except 
fbdev? */
+   fb = drm_client_display_current_fb(splash->display);
+   if (splash->buffer[i]->fb != fb &&
+   !(dev->fb_helper && dev->fb_helper->fb == fb))
+   break;
+
+   i = !i;
+   drm_bootsplash_draw(splash->buffer[i], sequence++);
+   if (sequence == 3)
+   sequence = 0;
+
+   ret = drm_client_display_commit(splash->display, 
splash->buffer[i]->fb, NULL);
+   /* Is userspace in charge or is the device unplugged? */
+   if (ret == -EBUSY || ret == -ENODEV)
+   break;
+
+   msleep(500);
+