system/dev/display/vim-display/vim-display.c - zircon - Git at Google

 // Copyright 2018 The Fuchsia Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "vim-display.h"
 #include "hdmitx.h"
 #include <assert.h>
 #include <ddk/binding.h>
 #include <ddk/debug.h>
 #include <ddk/device.h>
 #include <ddk/driver.h>
 #include <ddk/io-buffer.h>
 #include <ddk/protocol/display.h>
 #include <ddk/protocol/platform-defs.h>
 #include <ddk/protocol/platform-device.h>
 #include <hw/reg.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <zircon/assert.h>
 #include <zircon/device/display.h>
 #include <zircon/syscalls.h>

 /* Default formats */
 static const uint8_t _ginput_color_format   = HDMI_COLOR_FORMAT_444;
 static const uint8_t _gcolor_depth          = HDMI_COLOR_DEPTH_24B;

 // MMIO indices (based on vim2_display_mmios)
 enum {
     MMIO_PRESET,
     MMIO_HDMITX,
     MMIO_HIU,
     MMIO_VPU,
     MMIO_HDMTX_SEC,
     MMIO_DMC,
     MMIO_CBUS,
 };


 static zx_status_t vc_set_mode(void* ctx, zx_display_info_t* info) {
     return ZX_OK;
 }

 static zx_status_t vc_get_mode(void* ctx, zx_display_info_t* info) {
     vim2_display_t* display = ctx;
     memcpy(info, &display->disp_info, sizeof(zx_display_info_t));
     return ZX_OK;
 }

 static zx_status_t vc_get_framebuffer(void* ctx, void** framebuffer) {
     if (!framebuffer) return ZX_ERR_INVALID_ARGS;
     vim2_display_t* display = ctx;
     *framebuffer = display->fbuffer.vaddr;
     return ZX_OK;
 }

 static void flush_framebuffer(vim2_display_t* display) {
     pdev_vmo_buffer_cache_flush(&display->fbuffer, 0,
         (display->disp_info.stride * display->disp_info.height *
             ZX_PIXEL_FORMAT_BYTES(display->disp_info.format)));
 }

 static void vc_flush_framebuffer(void* ctx) {
     flush_framebuffer(ctx);
 }

 static void vc_display_set_ownership_change_callback(void* ctx, zx_display_cb_t callback,
                                                      void* cookie) {
     vim2_display_t* display = ctx;
     display->ownership_change_callback = callback;
     display->ownership_change_cookie = cookie;
 }

 static void vc_display_acquire_or_release_display(void* ctx, bool acquire) {
     vim2_display_t* display = ctx;

     if (acquire) {
         display->console_visible = true;
         if (display->ownership_change_callback)
             display->ownership_change_callback(true, display->ownership_change_cookie);
     } else if (!acquire) {
         display->console_visible = false;
         if (display->ownership_change_callback)
             display->ownership_change_callback(false, display->ownership_change_cookie);
     }
 }

 static display_protocol_ops_t vc_display_proto = {
     .set_mode = vc_set_mode,
     .get_mode = vc_get_mode,
     .get_framebuffer = vc_get_framebuffer,
     .flush = vc_flush_framebuffer,
     .set_ownership_change_callback = vc_display_set_ownership_change_callback,
     .acquire_or_release_display = vc_display_acquire_or_release_display,
 };

 static void display_release(void* ctx) {
     vim2_display_t* display = ctx;

     if (display) {
         pdev_vmo_buffer_release(&display->mmio_preset);
         pdev_vmo_buffer_release(&display->mmio_hdmitx);
         pdev_vmo_buffer_release(&display->mmio_hiu);
         pdev_vmo_buffer_release(&display->mmio_vpu);
         pdev_vmo_buffer_release(&display->mmio_hdmitx_sec);
         pdev_vmo_buffer_release(&display->mmio_dmc);
         pdev_vmo_buffer_release(&display->mmio_cbus);
         pdev_vmo_buffer_release(&display->fbuffer);
         free(display->edid_buf);
         free(display->p);
     }
     free(display);
 }

 static zx_protocol_device_t main_device_proto = {
     .version = DEVICE_OPS_VERSION,
     .release =  display_release,
 };

 struct display_client_device {
     vim2_display_t* display;
     zx_device_t* device;
 };

 static zx_status_t display_client_ioctl(void* ctx, uint32_t op, const void* in_buf, size_t in_len,
                                         void* out_buf, size_t out_len, size_t* out_actual) {
     struct display_client_device* client_struct = ctx;
     vim2_display_t* display = client_struct->display;
     switch (op) {
     case IOCTL_DISPLAY_GET_FB: {
         if (out_len < sizeof(ioctl_display_get_fb_t))
             return ZX_ERR_INVALID_ARGS;
         ioctl_display_get_fb_t* description = (ioctl_display_get_fb_t*)(out_buf);
         zx_status_t status = zx_handle_duplicate(display->fbuffer.handle, ZX_RIGHT_SAME_RIGHTS, &description->vmo);
         if (status != ZX_OK)
             return ZX_ERR_NO_RESOURCES;
         description->info = display->disp_info;
         *out_actual = sizeof(ioctl_display_get_fb_t);
         if (display->ownership_change_callback)
             display->ownership_change_callback(false, display->ownership_change_cookie);
         return ZX_OK;
     }
     case IOCTL_DISPLAY_FLUSH_FB:
     case IOCTL_DISPLAY_FLUSH_FB_REGION:
         flush_framebuffer(display);
         return ZX_OK;
     default:
         DISP_ERROR("Invalid ioctl %d\n", op);
         return ZX_ERR_INVALID_ARGS;
     }
 }

 static zx_status_t display_client_close(void* ctx, uint32_t flags) {
     struct display_client_device* client_struct = ctx;
     vim2_display_t* display = client_struct->display;
     if (display->ownership_change_callback)
         display->ownership_change_callback(true, display->ownership_change_cookie);
     free(ctx);
     return ZX_OK;
 }

 static zx_protocol_device_t client_device_proto = {
     .version = DEVICE_OPS_VERSION,
     .ioctl = display_client_ioctl,
     .close = display_client_close,
 };

 static zx_status_t vc_open(void* ctx, zx_device_t** dev_out, uint32_t flags) {
     struct display_client_device* s = calloc(1, sizeof(struct display_client_device));

     s->display = ctx;

     device_add_args_t vc_fbuff_args = {
         .version = DEVICE_ADD_ARGS_VERSION,
         .name = "vim2-display",
         .ctx = s,
         .ops = &client_device_proto,
         .flags = DEVICE_ADD_INSTANCE,
     };
     zx_status_t status = device_add(s->display->fbdevice, &vc_fbuff_args, &s->device);
     if (status != ZX_OK) {
         free(s);
         return status;
     }
     *dev_out = s->device;
     return ZX_OK;
 }

 static zx_protocol_device_t display_device_proto = {
     .version = DEVICE_OPS_VERSION,
     .open = vc_open,
 };

 static zx_status_t setup_hdmi(vim2_display_t* display)
 {
     zx_status_t status;
     // initialize HDMI
     status = init_hdmi_hardware(display);
     if (status != ZX_OK) {
         DISP_ERROR("HDMI hardware initialization failed\n");
         return status;
     }

     status = get_preferred_res(display, EDID_BUF_SIZE);
     if (status != ZX_OK) {
         DISP_ERROR("No display connected!\n");
         return status;

     }

     // allocate frame buffer
     display->disp_info.format = ZX_PIXEL_FORMAT_RGB_x888;
     display->disp_info.width  = display->p->timings.hactive;
     display->disp_info.height = display->p->timings.vactive;
     display->disp_info.stride = display->p->timings.hactive;
     display->disp_info.pixelsize = ZX_PIXEL_FORMAT_BYTES(display->disp_info.format);

     status = pdev_map_contig_buffer(&display->pdev,
                                     (display->disp_info.stride * display->disp_info.height *
                                      ZX_PIXEL_FORMAT_BYTES(display->disp_info.format)),
                                     0, ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_WRITE, ZX_CACHE_POLICY_CACHED,
                                     &display->fbuffer);
     if (status != ZX_OK) {
         return status;
     }


     display->input_color_format = _ginput_color_format;
     display->color_depth = _gcolor_depth;


     status = init_hdmi_interface(display, display->p);
     if (status != ZX_OK) {
         DISP_ERROR("HDMI interface initialization failed\n");
         return status;
     }

     /* Configure Canvas memory */
     configure_canvas(display);

     /* OSD2 setup */
     configure_osd2(display);

     zx_set_framebuffer(get_root_resource(), display->fbuffer.vaddr,
                        display->fbuffer.size, display->disp_info.format,
                        display->disp_info.width, display->disp_info.height,
                        display->disp_info.stride);

     device_add_args_t vc_fbuff_args = {
         .version = DEVICE_ADD_ARGS_VERSION,
         .name = "vim2-display",
         .ctx = display,
         .ops = &display_device_proto,
         .proto_id = ZX_PROTOCOL_DISPLAY,
         .proto_ops = &vc_display_proto,
     };

     status = device_add(display->mydevice, &vc_fbuff_args, &display->fbdevice);
     if (status != ZX_OK) {
         free(display);
         return status;
     }
     return ZX_OK;
 }

 static int main_hdmi_thread(void *arg)
 {
     vim2_display_t* display = arg;
     static bool hdmi_inited = false;
     static bool print_once = true;
     uint8_t hpd_val;

     if (gpio_config(&display->gpio, 0, GPIO_DIR_IN) != ZX_OK) {
         DISP_ERROR("Invalid HPD Pin!! Will try and connect to display anyways\n");
         // try once
         setup_hdmi(display);
         return ZX_OK;
     }

     while (1) {
         // check HPD GPIO Pins
         gpio_read(&display->gpio, 0, &hpd_val);

         if (hpd_val == 0) {
             if (print_once) {
                 DISP_ERROR("No Display Connected. Will try again later\n");
                 print_once = false;
             }
             if (hdmi_inited) {
                 // let's shutdown hdmi
                 DISP_ERROR("Display Disconnected!\n");
                 hdmi_shutdown(display);
                 pdev_vmo_buffer_release(&display->fbuffer);
                 device_remove(display->fbdevice);
                 hdmi_inited = false;
             }
         } else {
             if (!hdmi_inited) {
                 DISP_ERROR("Display is connected\n");
                 if (setup_hdmi(display) != ZX_OK) {
                     return ZX_ERR_UNAVAILABLE;
                 }
                 hdmi_inited = true;
             }
         }
         usleep(500000); // sleep with 500ms
     }
 }

 zx_status_t vim2_display_bind(void* ctx, zx_device_t* parent) {
     vim2_display_t* display = calloc(1, sizeof(vim2_display_t));
     if (!display) {
         DISP_ERROR("Could not allocated display structure\n");
         return ZX_ERR_NO_MEMORY;
     }

     display->parent = parent;
     display->console_visible = true;

     zx_status_t status = device_get_protocol(parent, ZX_PROTOCOL_PLATFORM_DEV, &display->pdev);
     if (status !=  ZX_OK) {
         DISP_ERROR("Could not get parent protocol\n");
         goto fail;
     }

     status = device_get_protocol(parent, ZX_PROTOCOL_GPIO, &display->gpio);
     if (status != ZX_OK) {
         DISP_ERROR("Could not get Display GPIO protocol\n");
         goto fail;
     }

     // Map all the various MMIOs
     status = pdev_map_mmio_buffer(&display->pdev, MMIO_PRESET, ZX_CACHE_POLICY_UNCACHED_DEVICE,
         &display->mmio_preset);
     if (status != ZX_OK) {
         DISP_ERROR("Could not map display MMIO PRESET\n");
         goto fail;
     }

     status = pdev_map_mmio_buffer(&display->pdev, MMIO_HDMITX, ZX_CACHE_POLICY_UNCACHED_DEVICE,
         &display->mmio_hdmitx);
     if (status != ZX_OK) {
         DISP_ERROR("Could not map display MMIO HDMITX\n");
         goto fail;
     }

     status = pdev_map_mmio_buffer(&display->pdev, MMIO_HIU, ZX_CACHE_POLICY_UNCACHED_DEVICE,
         &display->mmio_hiu);
     if (status != ZX_OK) {
         DISP_ERROR("Could not map display MMIO HIU\n");
         goto fail;
     }

     status = pdev_map_mmio_buffer(&display->pdev, MMIO_VPU, ZX_CACHE_POLICY_UNCACHED_DEVICE,
         &display->mmio_vpu);
     if (status != ZX_OK) {
         DISP_ERROR("Could not map display MMIO VPU\n");
         goto fail;
     }

     status = pdev_map_mmio_buffer(&display->pdev, MMIO_HDMTX_SEC, ZX_CACHE_POLICY_UNCACHED_DEVICE,
         &display->mmio_hdmitx_sec);
     if (status != ZX_OK) {
         DISP_ERROR("Could not map display MMIO HDMITX SEC\n");
         goto fail;
     }

     status = pdev_map_mmio_buffer(&display->pdev, MMIO_DMC, ZX_CACHE_POLICY_UNCACHED_DEVICE,
         &display->mmio_dmc);
     if (status != ZX_OK) {
         DISP_ERROR("Could not map display MMIO DMC\n");
         goto fail;
     }

     status = pdev_map_mmio_buffer(&display->pdev, MMIO_CBUS, ZX_CACHE_POLICY_UNCACHED_DEVICE,
         &display->mmio_cbus);
     if (status != ZX_OK) {
         DISP_ERROR("Could not map display MMIO CBUS\n");
         goto fail;
     }

     // Create EDID Buffer
     display->edid_buf = calloc(1, EDID_BUF_SIZE);
     if (!display->edid_buf) {
         DISP_ERROR("Could not allocated EDID BUf of size %d\n", EDID_BUF_SIZE);
         goto fail;
     }

     display->p = calloc(1, sizeof(struct hdmi_param));
     if (!display->p) {
         DISP_ERROR("Could not allocated hdmi param structure\n");
         goto fail;
     }

     device_add_args_t vc_fbuff_args = {
         .version = DEVICE_ADD_ARGS_VERSION,
         .name = "vim2-display",
         .ctx = display,
         .ops = &main_device_proto,
         .flags = (DEVICE_ADD_NON_BINDABLE | DEVICE_ADD_INVISIBLE),
     };

     status = device_add(display->parent, &vc_fbuff_args, &display->mydevice);

     thrd_create_with_name(&display->main_thread, main_hdmi_thread, display, "main_hdmi_thread");
     return ZX_OK;

 fail:
     DISP_ERROR("bind failed! %d\n", status);
     display_release(display);
     return status;

 }

 static zx_driver_ops_t vim2_display_driver_ops = {
     .version = DRIVER_OPS_VERSION,
     .bind = vim2_display_bind,
 };

 ZIRCON_DRIVER_BEGIN(vim2_display, vim2_display_driver_ops, "zircon", "0.1", 4)
     BI_ABORT_IF(NE, BIND_PROTOCOL, ZX_PROTOCOL_PLATFORM_DEV),
     BI_ABORT_IF(NE, BIND_PLATFORM_DEV_VID, PDEV_VID_KHADAS),
     BI_ABORT_IF(NE, BIND_PLATFORM_DEV_PID, PDEV_PID_VIM2),
     BI_MATCH_IF(EQ, BIND_PLATFORM_DEV_DID, PDEV_DID_VIM_DISPLAY),
 ZIRCON_DRIVER_END(vim_2display)
	// Copyright 2018 The Fuchsia Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "vim-display.h"
	#include "hdmitx.h"
	#include <assert.h>
	#include <ddk/binding.h>
	#include <ddk/debug.h>
	#include <ddk/device.h>
	#include <ddk/driver.h>
	#include <ddk/io-buffer.h>
	#include <ddk/protocol/display.h>
	#include <ddk/protocol/platform-defs.h>
	#include <ddk/protocol/platform-device.h>
	#include <hw/reg.h>
	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <zircon/assert.h>
	#include <zircon/device/display.h>
	#include <zircon/syscalls.h>

	/* Default formats */
	static const uint8_t _ginput_color_format = HDMI_COLOR_FORMAT_444;
	static const uint8_t _gcolor_depth = HDMI_COLOR_DEPTH_24B;

	// MMIO indices (based on vim2_display_mmios)
	enum {
	MMIO_PRESET,
	MMIO_HDMITX,
	MMIO_HIU,
	MMIO_VPU,
	MMIO_HDMTX_SEC,
	MMIO_DMC,
	MMIO_CBUS,
	};


	static zx_status_t vc_set_mode(void* ctx, zx_display_info_t* info) {
	return ZX_OK;
	}

	static zx_status_t vc_get_mode(void* ctx, zx_display_info_t* info) {
	vim2_display_t* display = ctx;
	memcpy(info, &display->disp_info, sizeof(zx_display_info_t));
	return ZX_OK;
	}

	static zx_status_t vc_get_framebuffer(void* ctx, void** framebuffer) {
	if (!framebuffer) return ZX_ERR_INVALID_ARGS;
	vim2_display_t* display = ctx;
	*framebuffer = display->fbuffer.vaddr;
	return ZX_OK;
	}

	static void flush_framebuffer(vim2_display_t* display) {
	pdev_vmo_buffer_cache_flush(&display->fbuffer, 0,
	(display->disp_info.stride * display->disp_info.height *
	ZX_PIXEL_FORMAT_BYTES(display->disp_info.format)));
	}

	static void vc_flush_framebuffer(void* ctx) {
	flush_framebuffer(ctx);
	}

	static void vc_display_set_ownership_change_callback(void* ctx, zx_display_cb_t callback,
	void* cookie) {
	vim2_display_t* display = ctx;
	display->ownership_change_callback = callback;
	display->ownership_change_cookie = cookie;
	}

	static void vc_display_acquire_or_release_display(void* ctx, bool acquire) {
	vim2_display_t* display = ctx;

	if (acquire) {
	display->console_visible = true;
	if (display->ownership_change_callback)
	display->ownership_change_callback(true, display->ownership_change_cookie);
	} else if (!acquire) {
	display->console_visible = false;
	if (display->ownership_change_callback)
	display->ownership_change_callback(false, display->ownership_change_cookie);
	}
	}

	static display_protocol_ops_t vc_display_proto = {
	.set_mode = vc_set_mode,
	.get_mode = vc_get_mode,
	.get_framebuffer = vc_get_framebuffer,
	.flush = vc_flush_framebuffer,
	.set_ownership_change_callback = vc_display_set_ownership_change_callback,
	.acquire_or_release_display = vc_display_acquire_or_release_display,
	};

	static void display_release(void* ctx) {
	vim2_display_t* display = ctx;

	if (display) {
	pdev_vmo_buffer_release(&display->mmio_preset);
	pdev_vmo_buffer_release(&display->mmio_hdmitx);
	pdev_vmo_buffer_release(&display->mmio_hiu);
	pdev_vmo_buffer_release(&display->mmio_vpu);
	pdev_vmo_buffer_release(&display->mmio_hdmitx_sec);
	pdev_vmo_buffer_release(&display->mmio_dmc);
	pdev_vmo_buffer_release(&display->mmio_cbus);
	pdev_vmo_buffer_release(&display->fbuffer);
	free(display->edid_buf);
	free(display->p);
	}
	free(display);
	}

	static zx_protocol_device_t main_device_proto = {
	.version = DEVICE_OPS_VERSION,
	.release = display_release,
	};

	struct display_client_device {
	vim2_display_t* display;
	zx_device_t* device;
	};

	static zx_status_t display_client_ioctl(void* ctx, uint32_t op, const void* in_buf, size_t in_len,
	void* out_buf, size_t out_len, size_t* out_actual) {
	struct display_client_device* client_struct = ctx;
	vim2_display_t* display = client_struct->display;
	switch (op) {
	case IOCTL_DISPLAY_GET_FB: {
	if (out_len < sizeof(ioctl_display_get_fb_t))
	return ZX_ERR_INVALID_ARGS;
	ioctl_display_get_fb_t* description = (ioctl_display_get_fb_t*)(out_buf);
	zx_status_t status = zx_handle_duplicate(display->fbuffer.handle, ZX_RIGHT_SAME_RIGHTS, &description->vmo);
	if (status != ZX_OK)
	return ZX_ERR_NO_RESOURCES;
	description->info = display->disp_info;
	*out_actual = sizeof(ioctl_display_get_fb_t);
	if (display->ownership_change_callback)
	display->ownership_change_callback(false, display->ownership_change_cookie);
	return ZX_OK;
	}
	case IOCTL_DISPLAY_FLUSH_FB:
	case IOCTL_DISPLAY_FLUSH_FB_REGION:
	flush_framebuffer(display);
	return ZX_OK;
	default:
	DISP_ERROR("Invalid ioctl %d\n", op);
	return ZX_ERR_INVALID_ARGS;
	}
	}

	static zx_status_t display_client_close(void* ctx, uint32_t flags) {
	struct display_client_device* client_struct = ctx;
	vim2_display_t* display = client_struct->display;
	if (display->ownership_change_callback)
	display->ownership_change_callback(true, display->ownership_change_cookie);
	free(ctx);
	return ZX_OK;
	}

	static zx_protocol_device_t client_device_proto = {
	.version = DEVICE_OPS_VERSION,
	.ioctl = display_client_ioctl,
	.close = display_client_close,
	};

	static zx_status_t vc_open(void* ctx, zx_device_t** dev_out, uint32_t flags) {
	struct display_client_device* s = calloc(1, sizeof(struct display_client_device));

	s->display = ctx;

	device_add_args_t vc_fbuff_args = {
	.version = DEVICE_ADD_ARGS_VERSION,
	.name = "vim2-display",
	.ctx = s,
	.ops = &client_device_proto,
	.flags = DEVICE_ADD_INSTANCE,
	};
	zx_status_t status = device_add(s->display->fbdevice, &vc_fbuff_args, &s->device);
	if (status != ZX_OK) {
	free(s);
	return status;
	}
	*dev_out = s->device;
	return ZX_OK;
	}

	static zx_protocol_device_t display_device_proto = {
	.version = DEVICE_OPS_VERSION,
	.open = vc_open,
	};

	static zx_status_t setup_hdmi(vim2_display_t* display)
	{
	zx_status_t status;
	// initialize HDMI
	status = init_hdmi_hardware(display);
	if (status != ZX_OK) {
	DISP_ERROR("HDMI hardware initialization failed\n");
	return status;
	}

	status = get_preferred_res(display, EDID_BUF_SIZE);
	if (status != ZX_OK) {
	DISP_ERROR("No display connected!\n");
	return status;

	}

	// allocate frame buffer
	display->disp_info.format = ZX_PIXEL_FORMAT_RGB_x888;
	display->disp_info.width = display->p->timings.hactive;
	display->disp_info.height = display->p->timings.vactive;
	display->disp_info.stride = display->p->timings.hactive;
	display->disp_info.pixelsize = ZX_PIXEL_FORMAT_BYTES(display->disp_info.format);

	status = pdev_map_contig_buffer(&display->pdev,
	(display->disp_info.stride * display->disp_info.height *
	ZX_PIXEL_FORMAT_BYTES(display->disp_info.format)),
	0, ZX_VM_FLAG_PERM_READ \| ZX_VM_FLAG_PERM_WRITE, ZX_CACHE_POLICY_CACHED,
	&display->fbuffer);
	if (status != ZX_OK) {
	return status;
	}


	display->input_color_format = _ginput_color_format;
	display->color_depth = _gcolor_depth;


	status = init_hdmi_interface(display, display->p);
	if (status != ZX_OK) {
	DISP_ERROR("HDMI interface initialization failed\n");
	return status;
	}

	/* Configure Canvas memory */
	configure_canvas(display);

	/* OSD2 setup */
	configure_osd2(display);

	zx_set_framebuffer(get_root_resource(), display->fbuffer.vaddr,
	display->fbuffer.size, display->disp_info.format,
	display->disp_info.width, display->disp_info.height,
	display->disp_info.stride);

	device_add_args_t vc_fbuff_args = {
	.version = DEVICE_ADD_ARGS_VERSION,
	.name = "vim2-display",
	.ctx = display,
	.ops = &display_device_proto,
	.proto_id = ZX_PROTOCOL_DISPLAY,
	.proto_ops = &vc_display_proto,
	};

	status = device_add(display->mydevice, &vc_fbuff_args, &display->fbdevice);
	if (status != ZX_OK) {
	free(display);
	return status;
	}
	return ZX_OK;
	}

	static int main_hdmi_thread(void *arg)
	{
	vim2_display_t* display = arg;
	static bool hdmi_inited = false;
	static bool print_once = true;
	uint8_t hpd_val;

	if (gpio_config(&display->gpio, 0, GPIO_DIR_IN) != ZX_OK) {
	DISP_ERROR("Invalid HPD Pin!! Will try and connect to display anyways\n");
	// try once
	setup_hdmi(display);
	return ZX_OK;
	}

	while (1) {
	// check HPD GPIO Pins
	gpio_read(&display->gpio, 0, &hpd_val);

	if (hpd_val == 0) {
	if (print_once) {
	DISP_ERROR("No Display Connected. Will try again later\n");
	print_once = false;
	}
	if (hdmi_inited) {
	// let's shutdown hdmi
	DISP_ERROR("Display Disconnected!\n");
	hdmi_shutdown(display);
	pdev_vmo_buffer_release(&display->fbuffer);
	device_remove(display->fbdevice);
	hdmi_inited = false;
	}
	} else {
	if (!hdmi_inited) {
	DISP_ERROR("Display is connected\n");
	if (setup_hdmi(display) != ZX_OK) {
	return ZX_ERR_UNAVAILABLE;
	}
	hdmi_inited = true;
	}
	}
	usleep(500000); // sleep with 500ms
	}
	}

	zx_status_t vim2_display_bind(void* ctx, zx_device_t* parent) {
	vim2_display_t* display = calloc(1, sizeof(vim2_display_t));
	if (!display) {
	DISP_ERROR("Could not allocated display structure\n");
	return ZX_ERR_NO_MEMORY;
	}

	display->parent = parent;
	display->console_visible = true;

	zx_status_t status = device_get_protocol(parent, ZX_PROTOCOL_PLATFORM_DEV, &display->pdev);
	if (status != ZX_OK) {
	DISP_ERROR("Could not get parent protocol\n");
	goto fail;
	}

	status = device_get_protocol(parent, ZX_PROTOCOL_GPIO, &display->gpio);
	if (status != ZX_OK) {
	DISP_ERROR("Could not get Display GPIO protocol\n");
	goto fail;
	}

	// Map all the various MMIOs
	status = pdev_map_mmio_buffer(&display->pdev, MMIO_PRESET, ZX_CACHE_POLICY_UNCACHED_DEVICE,
	&display->mmio_preset);
	if (status != ZX_OK) {
	DISP_ERROR("Could not map display MMIO PRESET\n");
	goto fail;
	}

	status = pdev_map_mmio_buffer(&display->pdev, MMIO_HDMITX, ZX_CACHE_POLICY_UNCACHED_DEVICE,
	&display->mmio_hdmitx);
	if (status != ZX_OK) {
	DISP_ERROR("Could not map display MMIO HDMITX\n");
	goto fail;
	}

	status = pdev_map_mmio_buffer(&display->pdev, MMIO_HIU, ZX_CACHE_POLICY_UNCACHED_DEVICE,
	&display->mmio_hiu);
	if (status != ZX_OK) {
	DISP_ERROR("Could not map display MMIO HIU\n");
	goto fail;
	}

	status = pdev_map_mmio_buffer(&display->pdev, MMIO_VPU, ZX_CACHE_POLICY_UNCACHED_DEVICE,
	&display->mmio_vpu);
	if (status != ZX_OK) {
	DISP_ERROR("Could not map display MMIO VPU\n");
	goto fail;
	}

	status = pdev_map_mmio_buffer(&display->pdev, MMIO_HDMTX_SEC, ZX_CACHE_POLICY_UNCACHED_DEVICE,
	&display->mmio_hdmitx_sec);
	if (status != ZX_OK) {
	DISP_ERROR("Could not map display MMIO HDMITX SEC\n");
	goto fail;
	}

	status = pdev_map_mmio_buffer(&display->pdev, MMIO_DMC, ZX_CACHE_POLICY_UNCACHED_DEVICE,
	&display->mmio_dmc);
	if (status != ZX_OK) {
	DISP_ERROR("Could not map display MMIO DMC\n");
	goto fail;
	}

	status = pdev_map_mmio_buffer(&display->pdev, MMIO_CBUS, ZX_CACHE_POLICY_UNCACHED_DEVICE,
	&display->mmio_cbus);
	if (status != ZX_OK) {
	DISP_ERROR("Could not map display MMIO CBUS\n");
	goto fail;
	}

	// Create EDID Buffer
	display->edid_buf = calloc(1, EDID_BUF_SIZE);
	if (!display->edid_buf) {
	DISP_ERROR("Could not allocated EDID BUf of size %d\n", EDID_BUF_SIZE);
	goto fail;
	}

	display->p = calloc(1, sizeof(struct hdmi_param));
	if (!display->p) {
	DISP_ERROR("Could not allocated hdmi param structure\n");
	goto fail;
	}

	device_add_args_t vc_fbuff_args = {
	.version = DEVICE_ADD_ARGS_VERSION,
	.name = "vim2-display",
	.ctx = display,
	.ops = &main_device_proto,
	.flags = (DEVICE_ADD_NON_BINDABLE \| DEVICE_ADD_INVISIBLE),
	};

	status = device_add(display->parent, &vc_fbuff_args, &display->mydevice);

	thrd_create_with_name(&display->main_thread, main_hdmi_thread, display, "main_hdmi_thread");
	return ZX_OK;

	fail:
	DISP_ERROR("bind failed! %d\n", status);
	display_release(display);
	return status;

	}

	static zx_driver_ops_t vim2_display_driver_ops = {
	.version = DRIVER_OPS_VERSION,
	.bind = vim2_display_bind,
	};

	ZIRCON_DRIVER_BEGIN(vim2_display, vim2_display_driver_ops, "zircon", "0.1", 4)
	BI_ABORT_IF(NE, BIND_PROTOCOL, ZX_PROTOCOL_PLATFORM_DEV),
	BI_ABORT_IF(NE, BIND_PLATFORM_DEV_VID, PDEV_VID_KHADAS),
	BI_ABORT_IF(NE, BIND_PLATFORM_DEV_PID, PDEV_PID_VIM2),
	BI_MATCH_IF(EQ, BIND_PLATFORM_DEV_DID, PDEV_DID_VIM_DISPLAY),
	ZIRCON_DRIVER_END(vim_2display)