Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 759 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tiny/gm12u320.c b/drivers/gpu/drm/tiny/gm12u320.c
new file mode 100644
index 000000000..8b0a9059d
--- /dev/null
+++ b/drivers/gpu/drm/tiny/gm12u320.c
@@ -0,0 +1,759 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_file.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+static bool eco_mode;
+module_param(eco_mode, bool, 0644);
+MODULE_PARM_DESC(eco_mode, "Turn on Eco mode (less bright, more silent)");
+
+#define DRIVER_NAME		"gm12u320"
+#define DRIVER_DESC		"Grain Media GM12U320 USB projector display"
+#define DRIVER_DATE		"2019"
+#define DRIVER_MAJOR		1
+#define DRIVER_MINOR		0
+
+/*
+ * The DLP has an actual width of 854 pixels, but that is not a multiple
+ * of 8, breaking things left and right, so we export a width of 848.
+ */
+#define GM12U320_USER_WIDTH		848
+#define GM12U320_REAL_WIDTH		854
+#define GM12U320_HEIGHT			480
+
+#define GM12U320_BLOCK_COUNT		20
+
+#define GM12U320_ERR(fmt, ...) \
+	DRM_DEV_ERROR(gm12u320->dev.dev, fmt, ##__VA_ARGS__)
+
+#define MISC_RCV_EPT			1
+#define DATA_RCV_EPT			2
+#define DATA_SND_EPT			3
+#define MISC_SND_EPT			4
+
+#define DATA_BLOCK_HEADER_SIZE		84
+#define DATA_BLOCK_CONTENT_SIZE		64512
+#define DATA_BLOCK_FOOTER_SIZE		20
+#define DATA_BLOCK_SIZE			(DATA_BLOCK_HEADER_SIZE + \
+					 DATA_BLOCK_CONTENT_SIZE + \
+					 DATA_BLOCK_FOOTER_SIZE)
+#define DATA_LAST_BLOCK_CONTENT_SIZE	4032
+#define DATA_LAST_BLOCK_SIZE		(DATA_BLOCK_HEADER_SIZE + \
+					 DATA_LAST_BLOCK_CONTENT_SIZE + \
+					 DATA_BLOCK_FOOTER_SIZE)
+
+#define CMD_SIZE			31
+#define READ_STATUS_SIZE		13
+#define MISC_VALUE_SIZE			4
+
+#define CMD_TIMEOUT			200
+#define DATA_TIMEOUT			1000
+#define IDLE_TIMEOUT			2000
+#define FIRST_FRAME_TIMEOUT		2000
+
+#define MISC_REQ_GET_SET_ECO_A		0xff
+#define MISC_REQ_GET_SET_ECO_B		0x35
+/* Windows driver does once every second, with arg d = 1, other args 0 */
+#define MISC_REQ_UNKNOWN1_A		0xff
+#define MISC_REQ_UNKNOWN1_B		0x38
+/* Windows driver does this on init, with arg a, b = 0, c = 0xa0, d = 4 */
+#define MISC_REQ_UNKNOWN2_A		0xa5
+#define MISC_REQ_UNKNOWN2_B		0x00
+
+struct gm12u320_device {
+	struct drm_device	         dev;
+	struct device                   *dmadev;
+	struct drm_simple_display_pipe   pipe;
+	struct drm_connector	         conn;
+	unsigned char                   *cmd_buf;
+	unsigned char                   *data_buf[GM12U320_BLOCK_COUNT];
+	struct {
+		struct delayed_work       work;
+		struct mutex             lock;
+		struct drm_framebuffer  *fb;
+		struct drm_rect          rect;
+		int frame;
+		int draw_status_timeout;
+		struct iosys_map src_map;
+	} fb_update;
+};
+
+#define to_gm12u320(__dev) container_of(__dev, struct gm12u320_device, dev)
+
+static const char cmd_data[CMD_SIZE] = {
+	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
+	0x68, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x10, 0xff,
+	0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x80, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const char cmd_draw[CMD_SIZE] = {
+	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xfe,
+	0x00, 0x00, 0x00, 0xc0, 0xd1, 0x05, 0x00, 0x40,
+	0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const char cmd_misc[CMD_SIZE] = {
+	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
+	0x04, 0x00, 0x00, 0x00, 0x80, 0x01, 0x10, 0xfd,
+	0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const char data_block_header[DATA_BLOCK_HEADER_SIZE] = {
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x04, 0x15, 0x00, 0x00, 0xfc, 0x00, 0x00,
+	0x01, 0x00, 0x00, 0xdb
+};
+
+static const char data_last_block_header[DATA_BLOCK_HEADER_SIZE] = {
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x2a, 0x00, 0x20, 0x00, 0xc0, 0x0f, 0x00, 0x00,
+	0x01, 0x00, 0x00, 0xd7
+};
+
+static const char data_block_footer[DATA_BLOCK_FOOTER_SIZE] = {
+	0xfb, 0x14, 0x02, 0x20, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x80, 0x00, 0x00, 0x4f
+};
+
+static inline struct usb_device *gm12u320_to_usb_device(struct gm12u320_device *gm12u320)
+{
+	return interface_to_usbdev(to_usb_interface(gm12u320->dev.dev));
+}
+
+static int gm12u320_usb_alloc(struct gm12u320_device *gm12u320)
+{
+	int i, block_size;
+	const char *hdr;
+
+	gm12u320->cmd_buf = drmm_kmalloc(&gm12u320->dev, CMD_SIZE, GFP_KERNEL);
+	if (!gm12u320->cmd_buf)
+		return -ENOMEM;
+
+	for (i = 0; i < GM12U320_BLOCK_COUNT; i++) {
+		if (i == GM12U320_BLOCK_COUNT - 1) {
+			block_size = DATA_LAST_BLOCK_SIZE;
+			hdr = data_last_block_header;
+		} else {
+			block_size = DATA_BLOCK_SIZE;
+			hdr = data_block_header;
+		}
+
+		gm12u320->data_buf[i] = drmm_kzalloc(&gm12u320->dev,
+						     block_size, GFP_KERNEL);
+		if (!gm12u320->data_buf[i])
+			return -ENOMEM;
+
+		memcpy(gm12u320->data_buf[i], hdr, DATA_BLOCK_HEADER_SIZE);
+		memcpy(gm12u320->data_buf[i] +
+				(block_size - DATA_BLOCK_FOOTER_SIZE),
+		       data_block_footer, DATA_BLOCK_FOOTER_SIZE);
+	}
+
+	return 0;
+}
+
+static int gm12u320_misc_request(struct gm12u320_device *gm12u320,
+				 u8 req_a, u8 req_b,
+				 u8 arg_a, u8 arg_b, u8 arg_c, u8 arg_d)
+{
+	struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
+	int ret, len;
+
+	memcpy(gm12u320->cmd_buf, &cmd_misc, CMD_SIZE);
+	gm12u320->cmd_buf[20] = req_a;
+	gm12u320->cmd_buf[21] = req_b;
+	gm12u320->cmd_buf[22] = arg_a;
+	gm12u320->cmd_buf[23] = arg_b;
+	gm12u320->cmd_buf[24] = arg_c;
+	gm12u320->cmd_buf[25] = arg_d;
+
+	/* Send request */
+	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, MISC_SND_EPT),
+			   gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
+	if (ret || len != CMD_SIZE) {
+		GM12U320_ERR("Misc. req. error %d\n", ret);
+		return -EIO;
+	}
+
+	/* Read value */
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
+			   gm12u320->cmd_buf, MISC_VALUE_SIZE, &len,
+			   DATA_TIMEOUT);
+	if (ret || len != MISC_VALUE_SIZE) {
+		GM12U320_ERR("Misc. value error %d\n", ret);
+		return -EIO;
+	}
+	/* cmd_buf[0] now contains the read value, which we don't use */
+
+	/* Read status */
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
+			   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
+			   CMD_TIMEOUT);
+	if (ret || len != READ_STATUS_SIZE) {
+		GM12U320_ERR("Misc. status error %d\n", ret);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void gm12u320_32bpp_to_24bpp_packed(u8 *dst, u8 *src, int len)
+{
+	while (len--) {
+		*dst++ = *src++;
+		*dst++ = *src++;
+		*dst++ = *src++;
+		src++;
+	}
+}
+
+static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320)
+{
+	int block, dst_offset, len, remain, ret, x1, x2, y1, y2;
+	struct drm_framebuffer *fb;
+	void *vaddr;
+	u8 *src;
+
+	mutex_lock(&gm12u320->fb_update.lock);
+
+	if (!gm12u320->fb_update.fb)
+		goto unlock;
+
+	fb = gm12u320->fb_update.fb;
+	x1 = gm12u320->fb_update.rect.x1;
+	x2 = gm12u320->fb_update.rect.x2;
+	y1 = gm12u320->fb_update.rect.y1;
+	y2 = gm12u320->fb_update.rect.y2;
+	vaddr = gm12u320->fb_update.src_map.vaddr; /* TODO: Use mapping abstraction properly */
+
+	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+	if (ret) {
+		GM12U320_ERR("drm_gem_fb_begin_cpu_access err: %d\n", ret);
+		goto put_fb;
+	}
+
+	src = vaddr + y1 * fb->pitches[0] + x1 * 4;
+
+	x1 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
+	x2 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
+
+	for (; y1 < y2; y1++) {
+		remain = 0;
+		len = (x2 - x1) * 3;
+		dst_offset = (y1 * GM12U320_REAL_WIDTH + x1) * 3;
+		block = dst_offset / DATA_BLOCK_CONTENT_SIZE;
+		dst_offset %= DATA_BLOCK_CONTENT_SIZE;
+
+		if ((dst_offset + len) > DATA_BLOCK_CONTENT_SIZE) {
+			remain = dst_offset + len - DATA_BLOCK_CONTENT_SIZE;
+			len = DATA_BLOCK_CONTENT_SIZE - dst_offset;
+		}
+
+		dst_offset += DATA_BLOCK_HEADER_SIZE;
+		len /= 3;
+
+		gm12u320_32bpp_to_24bpp_packed(
+			gm12u320->data_buf[block] + dst_offset,
+			src, len);
+
+		if (remain) {
+			block++;
+			dst_offset = DATA_BLOCK_HEADER_SIZE;
+			gm12u320_32bpp_to_24bpp_packed(
+				gm12u320->data_buf[block] + dst_offset,
+				src + len * 4, remain / 3);
+		}
+		src += fb->pitches[0];
+	}
+
+	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+put_fb:
+	drm_framebuffer_put(fb);
+	gm12u320->fb_update.fb = NULL;
+unlock:
+	mutex_unlock(&gm12u320->fb_update.lock);
+}
+
+static void gm12u320_fb_update_work(struct work_struct *work)
+{
+	struct gm12u320_device *gm12u320 =
+		container_of(to_delayed_work(work), struct gm12u320_device,
+			     fb_update.work);
+	struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
+	int block, block_size, len;
+	int ret = 0;
+
+	gm12u320_copy_fb_to_blocks(gm12u320);
+
+	for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
+		if (block == GM12U320_BLOCK_COUNT - 1)
+			block_size = DATA_LAST_BLOCK_SIZE;
+		else
+			block_size = DATA_BLOCK_SIZE;
+
+		/* Send data command to device */
+		memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
+		gm12u320->cmd_buf[8] = block_size & 0xff;
+		gm12u320->cmd_buf[9] = block_size >> 8;
+		gm12u320->cmd_buf[20] = 0xfc - block * 4;
+		gm12u320->cmd_buf[21] =
+			block | (gm12u320->fb_update.frame << 7);
+
+		ret = usb_bulk_msg(udev,
+				   usb_sndbulkpipe(udev, DATA_SND_EPT),
+				   gm12u320->cmd_buf, CMD_SIZE, &len,
+				   CMD_TIMEOUT);
+		if (ret || len != CMD_SIZE)
+			goto err;
+
+		/* Send data block to device */
+		ret = usb_bulk_msg(udev,
+				   usb_sndbulkpipe(udev, DATA_SND_EPT),
+				   gm12u320->data_buf[block], block_size,
+				   &len, DATA_TIMEOUT);
+		if (ret || len != block_size)
+			goto err;
+
+		/* Read status */
+		ret = usb_bulk_msg(udev,
+				   usb_rcvbulkpipe(udev, DATA_RCV_EPT),
+				   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
+				   CMD_TIMEOUT);
+		if (ret || len != READ_STATUS_SIZE)
+			goto err;
+	}
+
+	/* Send draw command to device */
+	memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
+	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, DATA_SND_EPT),
+			   gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
+	if (ret || len != CMD_SIZE)
+		goto err;
+
+	/* Read status */
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, DATA_RCV_EPT),
+			   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
+			   gm12u320->fb_update.draw_status_timeout);
+	if (ret || len != READ_STATUS_SIZE)
+		goto err;
+
+	gm12u320->fb_update.draw_status_timeout = CMD_TIMEOUT;
+	gm12u320->fb_update.frame = !gm12u320->fb_update.frame;
+
+	/*
+	 * We must draw a frame every 2s otherwise the projector
+	 * switches back to showing its logo.
+	 */
+	queue_delayed_work(system_long_wq, &gm12u320->fb_update.work,
+			   msecs_to_jiffies(IDLE_TIMEOUT));
+
+	return;
+err:
+	/* Do not log errors caused by module unload or device unplug */
+	if (ret != -ENODEV && ret != -ECONNRESET && ret != -ESHUTDOWN)
+		GM12U320_ERR("Frame update error: %d\n", ret);
+}
+
+static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
+				   const struct iosys_map *map,
+				   struct drm_rect *dirty)
+{
+	struct gm12u320_device *gm12u320 = to_gm12u320(fb->dev);
+	struct drm_framebuffer *old_fb = NULL;
+	bool wakeup = false;
+
+	mutex_lock(&gm12u320->fb_update.lock);
+
+	if (gm12u320->fb_update.fb != fb) {
+		old_fb = gm12u320->fb_update.fb;
+		drm_framebuffer_get(fb);
+		gm12u320->fb_update.fb = fb;
+		gm12u320->fb_update.rect = *dirty;
+		gm12u320->fb_update.src_map = *map;
+		wakeup = true;
+	} else {
+		struct drm_rect *rect = &gm12u320->fb_update.rect;
+
+		rect->x1 = min(rect->x1, dirty->x1);
+		rect->y1 = min(rect->y1, dirty->y1);
+		rect->x2 = max(rect->x2, dirty->x2);
+		rect->y2 = max(rect->y2, dirty->y2);
+	}
+
+	mutex_unlock(&gm12u320->fb_update.lock);
+
+	if (wakeup)
+		mod_delayed_work(system_long_wq, &gm12u320->fb_update.work, 0);
+
+	if (old_fb)
+		drm_framebuffer_put(old_fb);
+}
+
+static void gm12u320_stop_fb_update(struct gm12u320_device *gm12u320)
+{
+	struct drm_framebuffer *old_fb;
+
+	cancel_delayed_work_sync(&gm12u320->fb_update.work);
+
+	mutex_lock(&gm12u320->fb_update.lock);
+	old_fb = gm12u320->fb_update.fb;
+	gm12u320->fb_update.fb = NULL;
+	iosys_map_clear(&gm12u320->fb_update.src_map);
+	mutex_unlock(&gm12u320->fb_update.lock);
+
+	drm_framebuffer_put(old_fb);
+}
+
+static int gm12u320_set_ecomode(struct gm12u320_device *gm12u320)
+{
+	return gm12u320_misc_request(gm12u320, MISC_REQ_GET_SET_ECO_A,
+				     MISC_REQ_GET_SET_ECO_B, 0x01 /* set */,
+				     eco_mode ? 0x01 : 0x00, 0x00, 0x01);
+}
+
+/* ------------------------------------------------------------------ */
+/* gm12u320 connector						      */
+
+/*
+ * We use fake EDID info so that userspace know that it is dealing with
+ * an Acer projector, rather then listing this as an "unknown" monitor.
+ * Note this assumes this driver is only ever used with the Acer C120, if we
+ * add support for other devices the vendor and model should be parameterized.
+ */
+static struct edid gm12u320_edid = {
+	.header		= { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 },
+	.mfg_id		= { 0x04, 0x72 },	/* "ACR" */
+	.prod_code	= { 0x20, 0xc1 },	/* C120h */
+	.serial		= 0xaa55aa55,
+	.mfg_week	= 1,
+	.mfg_year	= 16,
+	.version	= 1,			/* EDID 1.3 */
+	.revision	= 3,			/* EDID 1.3 */
+	.input		= 0x08,			/* Analog input */
+	.features	= 0x0a,			/* Pref timing in DTD 1 */
+	.standard_timings = { { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 },
+			      { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 } },
+	.detailed_timings = { {
+		.pixel_clock = 3383,
+		/* hactive = 848, hblank = 256 */
+		.data.pixel_data.hactive_lo = 0x50,
+		.data.pixel_data.hblank_lo = 0x00,
+		.data.pixel_data.hactive_hblank_hi = 0x31,
+		/* vactive = 480, vblank = 28 */
+		.data.pixel_data.vactive_lo = 0xe0,
+		.data.pixel_data.vblank_lo = 0x1c,
+		.data.pixel_data.vactive_vblank_hi = 0x10,
+		/* hsync offset 40 pw 128, vsync offset 1 pw 4 */
+		.data.pixel_data.hsync_offset_lo = 0x28,
+		.data.pixel_data.hsync_pulse_width_lo = 0x80,
+		.data.pixel_data.vsync_offset_pulse_width_lo = 0x14,
+		.data.pixel_data.hsync_vsync_offset_pulse_width_hi = 0x00,
+		/* Digital separate syncs, hsync+, vsync+ */
+		.data.pixel_data.misc = 0x1e,
+	}, {
+		.pixel_clock = 0,
+		.data.other_data.type = 0xfd, /* Monitor ranges */
+		.data.other_data.data.range.min_vfreq = 59,
+		.data.other_data.data.range.max_vfreq = 61,
+		.data.other_data.data.range.min_hfreq_khz = 29,
+		.data.other_data.data.range.max_hfreq_khz = 32,
+		.data.other_data.data.range.pixel_clock_mhz = 4, /* 40 MHz */
+		.data.other_data.data.range.flags = 0,
+		.data.other_data.data.range.formula.cvt = {
+			0xa0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 },
+	}, {
+		.pixel_clock = 0,
+		.data.other_data.type = 0xfc, /* Model string */
+		.data.other_data.data.str.str = {
+			'P', 'r', 'o', 'j', 'e', 'c', 't', 'o', 'r', '\n',
+			' ', ' ',  ' ' },
+	}, {
+		.pixel_clock = 0,
+		.data.other_data.type = 0xfe, /* Unspecified text / padding */
+		.data.other_data.data.str.str = {
+			'\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
+			' ', ' ',  ' ' },
+	} },
+	.checksum = 0x13,
+};
+
+static int gm12u320_conn_get_modes(struct drm_connector *connector)
+{
+	drm_connector_update_edid_property(connector, &gm12u320_edid);
+	return drm_add_edid_modes(connector, &gm12u320_edid);
+}
+
+static const struct drm_connector_helper_funcs gm12u320_conn_helper_funcs = {
+	.get_modes = gm12u320_conn_get_modes,
+};
+
+static const struct drm_connector_funcs gm12u320_conn_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int gm12u320_conn_init(struct gm12u320_device *gm12u320)
+{
+	drm_connector_helper_add(&gm12u320->conn, &gm12u320_conn_helper_funcs);
+	return drm_connector_init(&gm12u320->dev, &gm12u320->conn,
+				  &gm12u320_conn_funcs, DRM_MODE_CONNECTOR_VGA);
+}
+
+/* ------------------------------------------------------------------ */
+/* gm12u320 (simple) display pipe				      */
+
+static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
+				 struct drm_crtc_state *crtc_state,
+				 struct drm_plane_state *plane_state)
+{
+	struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
+	struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+
+	gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
+	gm12u320_fb_mark_dirty(plane_state->fb, &shadow_plane_state->data[0], &rect);
+}
+
+static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+	struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
+
+	gm12u320_stop_fb_update(gm12u320);
+}
+
+static void gm12u320_pipe_update(struct drm_simple_display_pipe *pipe,
+				 struct drm_plane_state *old_state)
+{
+	struct drm_plane_state *state = pipe->plane.state;
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
+	struct drm_rect rect;
+
+	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
+		gm12u320_fb_mark_dirty(state->fb, &shadow_plane_state->data[0], &rect);
+}
+
+static const struct drm_simple_display_pipe_funcs gm12u320_pipe_funcs = {
+	.enable	    = gm12u320_pipe_enable,
+	.disable    = gm12u320_pipe_disable,
+	.update	    = gm12u320_pipe_update,
+	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
+};
+
+static const uint32_t gm12u320_pipe_formats[] = {
+	DRM_FORMAT_XRGB8888,
+};
+
+static const uint64_t gm12u320_pipe_modifiers[] = {
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
+/*
+ * FIXME: Dma-buf sharing requires DMA support by the importing device.
+ *        This function is a workaround to make USB devices work as well.
+ *        See todo.rst for how to fix the issue in the dma-buf framework.
+ */
+static struct drm_gem_object *gm12u320_gem_prime_import(struct drm_device *dev,
+							struct dma_buf *dma_buf)
+{
+	struct gm12u320_device *gm12u320 = to_gm12u320(dev);
+
+	if (!gm12u320->dmadev)
+		return ERR_PTR(-ENODEV);
+
+	return drm_gem_prime_import_dev(dev, dma_buf, gm12u320->dmadev);
+}
+
+DEFINE_DRM_GEM_FOPS(gm12u320_fops);
+
+static const struct drm_driver gm12u320_drm_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+
+	.name		 = DRIVER_NAME,
+	.desc		 = DRIVER_DESC,
+	.date		 = DRIVER_DATE,
+	.major		 = DRIVER_MAJOR,
+	.minor		 = DRIVER_MINOR,
+
+	.fops		 = &gm12u320_fops,
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	.gem_prime_import = gm12u320_gem_prime_import,
+};
+
+static const struct drm_mode_config_funcs gm12u320_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int gm12u320_usb_probe(struct usb_interface *interface,
+			      const struct usb_device_id *id)
+{
+	struct gm12u320_device *gm12u320;
+	struct drm_device *dev;
+	int ret;
+
+	/*
+	 * The gm12u320 presents itself to the system as 2 usb mass-storage
+	 * interfaces, we only care about / need the first one.
+	 */
+	if (interface->cur_altsetting->desc.bInterfaceNumber != 0)
+		return -ENODEV;
+
+	gm12u320 = devm_drm_dev_alloc(&interface->dev, &gm12u320_drm_driver,
+				      struct gm12u320_device, dev);
+	if (IS_ERR(gm12u320))
+		return PTR_ERR(gm12u320);
+	dev = &gm12u320->dev;
+
+	gm12u320->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
+	if (!gm12u320->dmadev)
+		drm_warn(dev, "buffer sharing not supported"); /* not an error */
+
+	INIT_DELAYED_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
+	mutex_init(&gm12u320->fb_update.lock);
+
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		goto err_put_device;
+
+	dev->mode_config.min_width = GM12U320_USER_WIDTH;
+	dev->mode_config.max_width = GM12U320_USER_WIDTH;
+	dev->mode_config.min_height = GM12U320_HEIGHT;
+	dev->mode_config.max_height = GM12U320_HEIGHT;
+	dev->mode_config.funcs = &gm12u320_mode_config_funcs;
+
+	ret = gm12u320_usb_alloc(gm12u320);
+	if (ret)
+		goto err_put_device;
+
+	ret = gm12u320_set_ecomode(gm12u320);
+	if (ret)
+		goto err_put_device;
+
+	ret = gm12u320_conn_init(gm12u320);
+	if (ret)
+		goto err_put_device;
+
+	ret = drm_simple_display_pipe_init(&gm12u320->dev,
+					   &gm12u320->pipe,
+					   &gm12u320_pipe_funcs,
+					   gm12u320_pipe_formats,
+					   ARRAY_SIZE(gm12u320_pipe_formats),
+					   gm12u320_pipe_modifiers,
+					   &gm12u320->conn);
+	if (ret)
+		goto err_put_device;
+
+	drm_mode_config_reset(dev);
+
+	usb_set_intfdata(interface, dev);
+	ret = drm_dev_register(dev, 0);
+	if (ret)
+		goto err_put_device;
+
+	drm_fbdev_generic_setup(dev, 0);
+
+	return 0;
+
+err_put_device:
+	put_device(gm12u320->dmadev);
+	return ret;
+}
+
+static void gm12u320_usb_disconnect(struct usb_interface *interface)
+{
+	struct drm_device *dev = usb_get_intfdata(interface);
+	struct gm12u320_device *gm12u320 = to_gm12u320(dev);
+
+	put_device(gm12u320->dmadev);
+	gm12u320->dmadev = NULL;
+	drm_dev_unplug(dev);
+	drm_atomic_helper_shutdown(dev);
+}
+
+static __maybe_unused int gm12u320_suspend(struct usb_interface *interface,
+					   pm_message_t message)
+{
+	struct drm_device *dev = usb_get_intfdata(interface);
+
+	return drm_mode_config_helper_suspend(dev);
+}
+
+static __maybe_unused int gm12u320_resume(struct usb_interface *interface)
+{
+	struct drm_device *dev = usb_get_intfdata(interface);
+	struct gm12u320_device *gm12u320 = to_gm12u320(dev);
+
+	gm12u320_set_ecomode(gm12u320);
+
+	return drm_mode_config_helper_resume(dev);
+}
+
+static const struct usb_device_id id_table[] = {
+	{ USB_DEVICE(0x1de1, 0xc102) },
+	{},
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_driver gm12u320_usb_driver = {
+	.name = "gm12u320",
+	.probe = gm12u320_usb_probe,
+	.disconnect = gm12u320_usb_disconnect,
+	.id_table = id_table,
+#ifdef CONFIG_PM
+	.suspend = gm12u320_suspend,
+	.resume = gm12u320_resume,
+	.reset_resume = gm12u320_resume,
+#endif
+};
+
+module_usb_driver(gm12u320_usb_driver);
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");