drivers/gpu/drm/drm_edid_load.c - maze/linux - Git at Google

 /*
    drm_edid_load.c: use a built-in EDID data set or load it via the firmware
 		    interface

    Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
 */

 #include <linux/module.h>
 #include <linux/firmware.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_edid.h>

 static char edid_firmware[PATH_MAX];
 module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
 MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
 	"from built-in data or /lib/firmware instead. ");

 #define GENERIC_EDIDS 5
 static const char *generic_edid_name[GENERIC_EDIDS] = {
 	"edid/1024x768.bin",
 	"edid/1280x1024.bin",
 	"edid/1600x1200.bin",
 	"edid/1680x1050.bin",
 	"edid/1920x1080.bin",
 };

 static const u8 generic_edid[GENERIC_EDIDS][128] = {
 	{
 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
 	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
 	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
 	0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
 	0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
 	0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
 	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
 	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
 	0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
 	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
 	0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
 	},
 	{
 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
 	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
 	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
 	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
 	0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
 	0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
 	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
 	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
 	0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
 	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
 	0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
 	},
 	{
 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
 	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78,
 	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
 	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f,
 	0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0,
 	0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e,
 	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
 	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
 	0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
 	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55,
 	0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d,
 	},
 	{
 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
 	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
 	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
 	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
 	0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
 	0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
 	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
 	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
 	0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
 	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
 	0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
 	},
 	{
 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
 	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
 	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
 	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
 	0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
 	0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
 	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
 	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
 	0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
 	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
 	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
 	0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
 	},
 };

 static int edid_size(const u8 *edid, int data_size)
 {
 	if (data_size < EDID_LENGTH)
 		return 0;

 	return (edid[0x7e] + 1) * EDID_LENGTH;
 }

 static void *edid_load(struct drm_connector *connector, const char *name,
 			const char *connector_name)
 {
 	const struct firmware *fw = NULL;
 	const u8 *fwdata;
 	u8 *edid;
 	int fwsize, builtin;
 	int i, valid_extensions = 0;
 	bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);

 	builtin = 0;
 	for (i = 0; i < GENERIC_EDIDS; i++) {
 		if (strcmp(name, generic_edid_name[i]) == 0) {
 			fwdata = generic_edid[i];
 			fwsize = sizeof(generic_edid[i]);
 			builtin = 1;
 			break;
 		}
 	}
 	if (!builtin) {
 		struct platform_device *pdev;
 		int err;

 		pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
 		if (IS_ERR(pdev)) {
 			DRM_ERROR("Failed to register EDID firmware platform device "
 				  "for connector \"%s\"\n", connector_name);
 			return ERR_CAST(pdev);
 		}

 		err = request_firmware(&fw, name, &pdev->dev);
 		platform_device_unregister(pdev);
 		if (err) {
 			DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
 				  name, err);
 			return ERR_PTR(err);
 		}

 		fwdata = fw->data;
 		fwsize = fw->size;
 	}

 	if (edid_size(fwdata, fwsize) != fwsize) {
 		DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
 			  "(expected %d, got %d\n", name,
 			  edid_size(fwdata, fwsize), (int)fwsize);
 		edid = ERR_PTR(-EINVAL);
 		goto out;
 	}

 	edid = kmemdup(fwdata, fwsize, GFP_KERNEL);
 	if (edid == NULL) {
 		edid = ERR_PTR(-ENOMEM);
 		goto out;
 	}

 	if (!drm_edid_block_valid(edid, 0, print_bad_edid)) {
 		connector->bad_edid_counter++;
 		DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
 		    name);
 		kfree(edid);
 		edid = ERR_PTR(-EINVAL);
 		goto out;
 	}

 	for (i = 1; i <= edid[0x7e]; i++) {
 		if (i != valid_extensions + 1)
 			memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
 			    edid + i * EDID_LENGTH, EDID_LENGTH);
 		if (drm_edid_block_valid(edid + i * EDID_LENGTH, i, print_bad_edid))
 			valid_extensions++;
 	}

 	if (valid_extensions != edid[0x7e]) {
 		u8 *new_edid;

 		edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
 		DRM_INFO("Found %d valid extensions instead of %d in EDID data "
 		    "\"%s\" for connector \"%s\"\n", valid_extensions,
 		    edid[0x7e], name, connector_name);
 		edid[0x7e] = valid_extensions;

 		new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
 				    GFP_KERNEL);
 		if (new_edid)
 			edid = new_edid;
 	}

 	DRM_INFO("Got %s EDID base block and %d extension%s from "
 	    "\"%s\" for connector \"%s\"\n", builtin ? "built-in" :
 	    "external", valid_extensions, valid_extensions == 1 ? "" : "s",
 	    name, connector_name);

 out:
 	if (fw)
 		release_firmware(fw);
 	return edid;
 }

 int drm_load_edid_firmware(struct drm_connector *connector)
 {
 	const char *connector_name = drm_get_connector_name(connector);
 	char *edidname = edid_firmware, *last, *colon;
 	int ret;
 	struct edid *edid;

 	if (*edidname == '\0')
 		return 0;

 	colon = strchr(edidname, ':');
 	if (colon != NULL) {
 		if (strncmp(connector_name, edidname, colon - edidname))
 			return 0;
 		edidname = colon + 1;
 		if (*edidname == '\0')
 			return 0;
 	}

 	last = edidname + strlen(edidname) - 1;
 	if (*last == '\n')
 		*last = '\0';

 	edid = edid_load(connector, edidname, connector_name);
 	if (IS_ERR_OR_NULL(edid))
 		return 0;

 	drm_mode_connector_update_edid_property(connector, edid);
 	ret = drm_add_edid_modes(connector, edid);
 	kfree(edid);

 	return ret;
 }
	/*
	drm_edid_load.c: use a built-in EDID data set or load it via the firmware
	interface

	Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include <linux/module.h>
	#include <linux/firmware.h>
	#include <drm/drmP.h>
	#include <drm/drm_crtc.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/drm_edid.h>

	static char edid_firmware[PATH_MAX];
	module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
	MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
	"from built-in data or /lib/firmware instead. ");

	#define GENERIC_EDIDS 5
	static const char *generic_edid_name[GENERIC_EDIDS] = {
	"edid/1024x768.bin",
	"edid/1280x1024.bin",
	"edid/1600x1200.bin",
	"edid/1680x1050.bin",
	"edid/1920x1080.bin",
	};

	static const u8 generic_edid[GENERIC_EDIDS][128] = {
	{
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
	0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
	0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
	0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
	0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
	0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
	},
	{
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
	0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
	0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
	0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
	0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
	},
	{
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78,
	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f,
	0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0,
	0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e,
	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
	0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55,
	0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d,
	},
	{
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
	0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
	0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
	0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
	0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
	},
	{
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
	0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
	0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
	0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
	0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
	0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
	},
	};

	static int edid_size(const u8 *edid, int data_size)
	{
	if (data_size < EDID_LENGTH)
	return 0;

	return (edid[0x7e] + 1) * EDID_LENGTH;
	}

	static void edid_load(struct drm_connector connector, const char *name,
	const char *connector_name)
	{
	const struct firmware *fw = NULL;
	const u8 *fwdata;
	u8 *edid;
	int fwsize, builtin;
	int i, valid_extensions = 0;
	bool print_bad_edid = !connector->bad_edid_counter \|\| (drm_debug & DRM_UT_KMS);

	builtin = 0;
	for (i = 0; i < GENERIC_EDIDS; i++) {
	if (strcmp(name, generic_edid_name[i]) == 0) {
	fwdata = generic_edid[i];
	fwsize = sizeof(generic_edid[i]);
	builtin = 1;
	break;
	}
	}
	if (!builtin) {
	struct platform_device *pdev;
	int err;

	pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
	if (IS_ERR(pdev)) {
	DRM_ERROR("Failed to register EDID firmware platform device "
	"for connector \"%s\"\n", connector_name);
	return ERR_CAST(pdev);
	}

	err = request_firmware(&fw, name, &pdev->dev);
	platform_device_unregister(pdev);
	if (err) {
	DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
	name, err);
	return ERR_PTR(err);
	}

	fwdata = fw->data;
	fwsize = fw->size;
	}

	if (edid_size(fwdata, fwsize) != fwsize) {
	DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
	"(expected %d, got %d\n", name,
	edid_size(fwdata, fwsize), (int)fwsize);
	edid = ERR_PTR(-EINVAL);
	goto out;
	}

	edid = kmemdup(fwdata, fwsize, GFP_KERNEL);
	if (edid == NULL) {
	edid = ERR_PTR(-ENOMEM);
	goto out;
	}

	if (!drm_edid_block_valid(edid, 0, print_bad_edid)) {
	connector->bad_edid_counter++;
	DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
	name);
	kfree(edid);
	edid = ERR_PTR(-EINVAL);
	goto out;
	}

	for (i = 1; i <= edid[0x7e]; i++) {
	if (i != valid_extensions + 1)
	memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
	edid + i * EDID_LENGTH, EDID_LENGTH);
	if (drm_edid_block_valid(edid + i * EDID_LENGTH, i, print_bad_edid))
	valid_extensions++;
	}

	if (valid_extensions != edid[0x7e]) {
	u8 *new_edid;

	edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
	DRM_INFO("Found %d valid extensions instead of %d in EDID data "
	"\"%s\" for connector \"%s\"\n", valid_extensions,
	edid[0x7e], name, connector_name);
	edid[0x7e] = valid_extensions;

	new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
	GFP_KERNEL);
	if (new_edid)
	edid = new_edid;
	}

	DRM_INFO("Got %s EDID base block and %d extension%s from "
	"\"%s\" for connector \"%s\"\n", builtin ? "built-in" :
	"external", valid_extensions, valid_extensions == 1 ? "" : "s",
	name, connector_name);

	out:
	if (fw)
	release_firmware(fw);
	return edid;
	}

	int drm_load_edid_firmware(struct drm_connector *connector)
	{
	const char *connector_name = drm_get_connector_name(connector);
	char edidname = edid_firmware, last, *colon;
	int ret;
	struct edid *edid;

	if (*edidname == '\0')
	return 0;

	colon = strchr(edidname, ':');
	if (colon != NULL) {
	if (strncmp(connector_name, edidname, colon - edidname))
	return 0;
	edidname = colon + 1;
	if (*edidname == '\0')
	return 0;
	}

	last = edidname + strlen(edidname) - 1;
	if (*last == '\n')
	*last = '\0';

	edid = edid_load(connector, edidname, connector_name);
	if (IS_ERR_OR_NULL(edid))
	return 0;

	drm_mode_connector_update_edid_property(connector, edid);
	ret = drm_add_edid_modes(connector, edid);
	kfree(edid);

	return ret;
	}