drivers/firmware/efi/sysfb_efi.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Generic System Framebuffers
  * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
  *
  * EFI Quirks Copyright (c) 2006 Edgar Hucek <gimli@dark-green.com>
  */

 /*
  * EFI Quirks
  * Several EFI systems do not correctly advertise their boot framebuffers.
  * Hence, we use this static table of known broken machines and fix up the
  * information so framebuffer drivers can load correctly.
  */

 #include <linux/dmi.h>
 #include <linux/err.h>
 #include <linux/efi.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/of_address.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/screen_info.h>
 #include <linux/sysfb.h>
 #include <video/vga.h>

 #include <asm/efi.h>

 enum {
 	OVERRIDE_NONE = 0x0,
 	OVERRIDE_BASE = 0x1,
 	OVERRIDE_STRIDE = 0x2,
 	OVERRIDE_HEIGHT = 0x4,
 	OVERRIDE_WIDTH = 0x8,
 };

 struct efifb_dmi_info efifb_dmi_list[] = {
 	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
 	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
 	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
 	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
 	[M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 	[M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
 	[M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
 	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
 	[M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
 	[M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 	[M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 	[M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 	[M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 	/* 11" Macbook Air 3,1 passes the wrong stride */
 	[M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
 	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
 	[M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
 	[M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
 	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
 	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 	[M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
 	[M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 	[M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
 	[M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 	[M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
 	[M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 	[M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
 	[M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
 };

 void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
 {
 	int i;

 	for (i = 0; i < M_UNKNOWN; i++) {
 		if (efifb_dmi_list[i].base != 0 &&
 		    !strcmp(opt, efifb_dmi_list[i].optname)) {
 			si->lfb_base = efifb_dmi_list[i].base;
 			si->lfb_linelength = efifb_dmi_list[i].stride;
 			si->lfb_width = efifb_dmi_list[i].width;
 			si->lfb_height = efifb_dmi_list[i].height;
 		}
 	}
 }

 #define choose_value(dmivalue, fwvalue, field, flags) ({	\
 		typeof(fwvalue) _ret_ = fwvalue;		\
 		if ((flags) & (field))				\
 			_ret_ = dmivalue;			\
 		else if ((fwvalue) == 0)			\
 			_ret_ = dmivalue;			\
 		_ret_;						\
 	})

 static int __init efifb_set_system(const struct dmi_system_id *id)
 {
 	struct efifb_dmi_info *info = id->driver_data;

 	if (info->base == 0 && info->height == 0 && info->width == 0 &&
 	    info->stride == 0)
 		return 0;

 	/* Trust the bootloader over the DMI tables */
 	if (screen_info.lfb_base == 0) {
 #if defined(CONFIG_PCI)
 		struct pci_dev *dev = NULL;
 		int found_bar = 0;
 #endif
 		if (info->base) {
 			screen_info.lfb_base = choose_value(info->base,
 				screen_info.lfb_base, OVERRIDE_BASE,
 				info->flags);

 #if defined(CONFIG_PCI)
 			/* make sure that the address in the table is actually
 			 * on a VGA device's PCI BAR */

 			for_each_pci_dev(dev) {
 				int i;
 				if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
 					continue;
 				for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 					resource_size_t start, end;
 					unsigned long flags;

 					flags = pci_resource_flags(dev, i);
 					if (!(flags & IORESOURCE_MEM))
 						continue;

 					if (flags & IORESOURCE_UNSET)
 						continue;

 					if (pci_resource_len(dev, i) == 0)
 						continue;

 					start = pci_resource_start(dev, i);
 					end = pci_resource_end(dev, i);
 					if (screen_info.lfb_base >= start &&
 					    screen_info.lfb_base < end) {
 						found_bar = 1;
 						break;
 					}
 				}
 			}
 			if (!found_bar)
 				screen_info.lfb_base = 0;
 #endif
 		}
 	}
 	if (screen_info.lfb_base) {
 		screen_info.lfb_linelength = choose_value(info->stride,
 			screen_info.lfb_linelength, OVERRIDE_STRIDE,
 			info->flags);
 		screen_info.lfb_width = choose_value(info->width,
 			screen_info.lfb_width, OVERRIDE_WIDTH,
 			info->flags);
 		screen_info.lfb_height = choose_value(info->height,
 			screen_info.lfb_height, OVERRIDE_HEIGHT,
 			info->flags);
 		if (screen_info.orig_video_isVGA == 0)
 			screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
 	} else {
 		screen_info.lfb_linelength = 0;
 		screen_info.lfb_width = 0;
 		screen_info.lfb_height = 0;
 		screen_info.orig_video_isVGA = 0;
 		return 0;
 	}

 	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
 			 "(%dx%d, stride %d)\n", id->ident,
 			 screen_info.lfb_base, screen_info.lfb_width,
 			 screen_info.lfb_height, screen_info.lfb_linelength);

 	return 1;
 }

 #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)		\
 	{							\
 		efifb_set_system,				\
 		name,						\
 		{						\
 			DMI_MATCH(DMI_BIOS_VENDOR, vendor),	\
 			DMI_MATCH(DMI_PRODUCT_NAME, name)	\
 		},						\
 		&efifb_dmi_list[enumid]				\
 	}

 static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
 	/* At least one of these two will be right; maybe both? */
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
 	/* At least one of these two will be right; maybe both? */
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
 	/* At least one of these two will be right; maybe both? */
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
 	/* At least one of these two will be right; maybe both? */
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
 	{},
 };

 /*
  * Some devices have a portrait LCD but advertise a landscape resolution (and
  * pitch). We simply swap width and height for these devices so that we can
  * correctly deal with some of them coming with multiple resolutions.
  */
 static const struct dmi_system_id efifb_dmi_swap_width_height[] __initconst = {
 	{
 		/*
 		 * Lenovo MIIX310-10ICR, only some batches have the troublesome
 		 * 800x1280 portrait screen. Luckily the portrait version has
 		 * its own BIOS version, so we match on that.
 		 */
 		.matches = {
 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "MIIX 310-10ICR"),
 			DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1HCN44WW"),
 		},
 	},
 	{
 		/* Lenovo MIIX 320-10ICR with 800x1280 portrait screen */
 		.matches = {
 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
 					"Lenovo MIIX 320-10ICR"),
 		},
 	},
 	{
 		/* Lenovo D330 with 800x1280 or 1200x1920 portrait screen */
 		.matches = {
 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
 					"Lenovo ideapad D330-10IGM"),
 		},
 	},
 	{},
 };

 static bool efifb_overlaps_pci_range(const struct of_pci_range *range)
 {
 	u64 fb_base = screen_info.lfb_base;

 	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 		fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32;

 	return fb_base >= range->cpu_addr &&
 	       fb_base < (range->cpu_addr + range->size);
 }

 static struct device_node *find_pci_overlap_node(void)
 {
 	struct device_node *np;

 	for_each_node_by_type(np, "pci") {
 		struct of_pci_range_parser parser;
 		struct of_pci_range range;
 		int err;

 		err = of_pci_range_parser_init(&parser, np);
 		if (err) {
 			pr_warn("of_pci_range_parser_init() failed: %d\n", err);
 			continue;
 		}

 		for_each_of_pci_range(&parser, &range)
 			if (efifb_overlaps_pci_range(&range))
 				return np;
 	}
 	return NULL;
 }

 /*
  * If the efifb framebuffer is backed by a PCI graphics controller, we have
  * to ensure that this relation is expressed using a device link when
  * running in DT mode, or the probe order may be reversed, resulting in a
  * resource reservation conflict on the memory window that the efifb
  * framebuffer steals from the PCIe host bridge.
  */
 static int efifb_add_links(struct fwnode_handle *fwnode)
 {
 	struct device_node *sup_np;

 	sup_np = find_pci_overlap_node();

 	/*
 	 * If there's no PCI graphics controller backing the efifb, we are
 	 * done here.
 	 */
 	if (!sup_np)
 		return 0;

 	fwnode_link_add(fwnode, of_fwnode_handle(sup_np));
 	of_node_put(sup_np);

 	return 0;
 }

 static const struct fwnode_operations efifb_fwnode_ops = {
 	.add_links = efifb_add_links,
 };

 #ifdef CONFIG_EFI
 static struct fwnode_handle efifb_fwnode;

 __init void sysfb_apply_efi_quirks(struct platform_device *pd)
 {
 	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
 	    !(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
 		dmi_check_system(efifb_dmi_system_table);

 	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
 	    dmi_check_system(efifb_dmi_swap_width_height)) {
 		u16 temp = screen_info.lfb_width;

 		screen_info.lfb_width = screen_info.lfb_height;
 		screen_info.lfb_height = temp;
 		screen_info.lfb_linelength = 4 * screen_info.lfb_width;
 	}

 	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI && IS_ENABLED(CONFIG_PCI)) {
 		fwnode_init(&efifb_fwnode, &efifb_fwnode_ops);
 		pd->dev.fwnode = &efifb_fwnode;
 	}
 }
 #endif
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Generic System Framebuffers
	* Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
	*
	* EFI Quirks Copyright (c) 2006 Edgar Hucek <gimli@dark-green.com>
	*/

	/*
	* EFI Quirks
	* Several EFI systems do not correctly advertise their boot framebuffers.
	* Hence, we use this static table of known broken machines and fix up the
	* information so framebuffer drivers can load correctly.
	*/

	#include <linux/dmi.h>
	#include <linux/err.h>
	#include <linux/efi.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/of_address.h>
	#include <linux/pci.h>
	#include <linux/platform_device.h>
	#include <linux/screen_info.h>
	#include <linux/sysfb.h>
	#include <video/vga.h>

	#include <asm/efi.h>

	enum {
	OVERRIDE_NONE = 0x0,
	OVERRIDE_BASE = 0x1,
	OVERRIDE_STRIDE = 0x2,
	OVERRIDE_HEIGHT = 0x4,
	OVERRIDE_WIDTH = 0x8,
	};

	struct efifb_dmi_info efifb_dmi_list[] = {
	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
	[M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
	[M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
	[M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
	[M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
	[M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
	[M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
	[M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
	[M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
	/* 11" Macbook Air 3,1 passes the wrong stride */
	[M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
	[M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
	[M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
	[M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
	[M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
	[M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
	[M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
	[M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
	[M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
	[M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
	[M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
	};

	void efifb_setup_from_dmi(struct screen_info si, const char opt)
	{
	int i;

	for (i = 0; i < M_UNKNOWN; i++) {
	if (efifb_dmi_list[i].base != 0 &&
	!strcmp(opt, efifb_dmi_list[i].optname)) {
	si->lfb_base = efifb_dmi_list[i].base;
	si->lfb_linelength = efifb_dmi_list[i].stride;
	si->lfb_width = efifb_dmi_list[i].width;
	si->lfb_height = efifb_dmi_list[i].height;
	}
	}
	}

	#define choose_value(dmivalue, fwvalue, field, flags) ({ \
	typeof(fwvalue) _ret_ = fwvalue; \
	if ((flags) & (field)) \
	_ret_ = dmivalue; \
	else if ((fwvalue) == 0) \
	_ret_ = dmivalue; \
	_ret_; \
	})

	static int __init efifb_set_system(const struct dmi_system_id *id)
	{
	struct efifb_dmi_info *info = id->driver_data;

	if (info->base == 0 && info->height == 0 && info->width == 0 &&
	info->stride == 0)
	return 0;

	/* Trust the bootloader over the DMI tables */
	if (screen_info.lfb_base == 0) {
	#if defined(CONFIG_PCI)
	struct pci_dev *dev = NULL;
	int found_bar = 0;
	#endif
	if (info->base) {
	screen_info.lfb_base = choose_value(info->base,
	screen_info.lfb_base, OVERRIDE_BASE,
	info->flags);

	#if defined(CONFIG_PCI)
	/* make sure that the address in the table is actually
	* on a VGA device's PCI BAR */

	for_each_pci_dev(dev) {
	int i;
	if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
	continue;
	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
	resource_size_t start, end;
	unsigned long flags;

	flags = pci_resource_flags(dev, i);
	if (!(flags & IORESOURCE_MEM))
	continue;

	if (flags & IORESOURCE_UNSET)
	continue;

	if (pci_resource_len(dev, i) == 0)
	continue;

	start = pci_resource_start(dev, i);
	end = pci_resource_end(dev, i);
	if (screen_info.lfb_base >= start &&
	screen_info.lfb_base < end) {
	found_bar = 1;
	break;
	}
	}
	}
	if (!found_bar)
	screen_info.lfb_base = 0;
	#endif
	}
	}
	if (screen_info.lfb_base) {
	screen_info.lfb_linelength = choose_value(info->stride,
	screen_info.lfb_linelength, OVERRIDE_STRIDE,
	info->flags);
	screen_info.lfb_width = choose_value(info->width,
	screen_info.lfb_width, OVERRIDE_WIDTH,
	info->flags);
	screen_info.lfb_height = choose_value(info->height,
	screen_info.lfb_height, OVERRIDE_HEIGHT,
	info->flags);
	if (screen_info.orig_video_isVGA == 0)
	screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
	} else {
	screen_info.lfb_linelength = 0;
	screen_info.lfb_width = 0;
	screen_info.lfb_height = 0;
	screen_info.orig_video_isVGA = 0;
	return 0;
	}

	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
	"(%dx%d, stride %d)\n", id->ident,
	screen_info.lfb_base, screen_info.lfb_width,
	screen_info.lfb_height, screen_info.lfb_linelength);

	return 1;
	}

	#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid) \
	{ \
	efifb_set_system, \
	name, \
	{ \
	DMI_MATCH(DMI_BIOS_VENDOR, vendor), \
	DMI_MATCH(DMI_PRODUCT_NAME, name) \
	}, \
	&efifb_dmi_list[enumid] \
	}

	static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
	{},
	};

	/*
	* Some devices have a portrait LCD but advertise a landscape resolution (and
	* pitch). We simply swap width and height for these devices so that we can
	* correctly deal with some of them coming with multiple resolutions.
	*/
	static const struct dmi_system_id efifb_dmi_swap_width_height[] __initconst = {
	{
	/*
	* Lenovo MIIX310-10ICR, only some batches have the troublesome
	* 800x1280 portrait screen. Luckily the portrait version has
	* its own BIOS version, so we match on that.
	*/
	.matches = {
	DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "MIIX 310-10ICR"),
	DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1HCN44WW"),
	},
	},
	{
	/* Lenovo MIIX 320-10ICR with 800x1280 portrait screen */
	.matches = {
	DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
	"Lenovo MIIX 320-10ICR"),
	},
	},
	{
	/* Lenovo D330 with 800x1280 or 1200x1920 portrait screen */
	.matches = {
	DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
	"Lenovo ideapad D330-10IGM"),
	},
	},
	{},
	};

	static bool efifb_overlaps_pci_range(const struct of_pci_range *range)
	{
	u64 fb_base = screen_info.lfb_base;

	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
	fb_base \|= (u64)(unsigned long)screen_info.ext_lfb_base << 32;

	return fb_base >= range->cpu_addr &&
	fb_base < (range->cpu_addr + range->size);
	}

	static struct device_node *find_pci_overlap_node(void)
	{
	struct device_node *np;

	for_each_node_by_type(np, "pci") {
	struct of_pci_range_parser parser;
	struct of_pci_range range;
	int err;

	err = of_pci_range_parser_init(&parser, np);
	if (err) {
	pr_warn("of_pci_range_parser_init() failed: %d\n", err);
	continue;
	}

	for_each_of_pci_range(&parser, &range)
	if (efifb_overlaps_pci_range(&range))
	return np;
	}
	return NULL;
	}

	/*
	* If the efifb framebuffer is backed by a PCI graphics controller, we have
	* to ensure that this relation is expressed using a device link when
	* running in DT mode, or the probe order may be reversed, resulting in a
	* resource reservation conflict on the memory window that the efifb
	* framebuffer steals from the PCIe host bridge.
	*/
	static int efifb_add_links(struct fwnode_handle *fwnode)
	{
	struct device_node *sup_np;

	sup_np = find_pci_overlap_node();

	/*
	* If there's no PCI graphics controller backing the efifb, we are
	* done here.
	*/
	if (!sup_np)
	return 0;

	fwnode_link_add(fwnode, of_fwnode_handle(sup_np));
	of_node_put(sup_np);

	return 0;
	}

	static const struct fwnode_operations efifb_fwnode_ops = {
	.add_links = efifb_add_links,
	};

	#ifdef CONFIG_EFI
	static struct fwnode_handle efifb_fwnode;

	__init void sysfb_apply_efi_quirks(struct platform_device *pd)
	{
	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI \|\|
	!(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
	dmi_check_system(efifb_dmi_system_table);

	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
	dmi_check_system(efifb_dmi_swap_width_height)) {
	u16 temp = screen_info.lfb_width;

	screen_info.lfb_width = screen_info.lfb_height;
	screen_info.lfb_height = temp;
	screen_info.lfb_linelength = 4 * screen_info.lfb_width;
	}

	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI && IS_ENABLED(CONFIG_PCI)) {
	fwnode_init(&efifb_fwnode, &efifb_fwnode_ops);
	pd->dev.fwnode = &efifb_fwnode;
	}
	}
	#endif