1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
new file mode 100644
index 000000000..5d9ef267e
--- /dev/null
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+   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>
+
+*/
+
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_print.h>
+
+#include "drm_crtc_internal.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. ");
+
+/* Use only for backward compatibility with drm_kms_helper.edid_firmware */
+int __drm_set_edid_firmware_path(const char *path)
+{
+	scnprintf(edid_firmware, sizeof(edid_firmware), "%s", path);
+
+	return 0;
+}
+EXPORT_SYMBOL(__drm_set_edid_firmware_path);
+
+/* Use only for backward compatibility with drm_kms_helper.edid_firmware */
+int __drm_get_edid_firmware_path(char *buf, size_t bufsize)
+{
+	return scnprintf(buf, bufsize, "%s", edid_firmware);
+}
+EXPORT_SYMBOL(__drm_get_edid_firmware_path);
+
+#define GENERIC_EDIDS 6
+static const char * const generic_edid_name[GENERIC_EDIDS] = {
+	"edid/800x600.bin",
+	"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, 0x1b, 0x14, 0x78,
+	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
+	0x20, 0x50, 0x54, 0x01, 0x00, 0x00, 0x45, 0x40,
+	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xa0, 0x0f,
+	0x20, 0x00, 0x31, 0x58, 0x1c, 0x20, 0x28, 0x80,
+	0x14, 0x00, 0x15, 0xd0, 0x10, 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, 0x24, 0x26, 0x05, 0x00, 0x0a, 0x20, 0x20,
+	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
+	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
+	0x56, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xc2,
+	},
+	{
+	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 const struct drm_edid *edid_load(struct drm_connector *connector, const char *name)
+{
+	const struct firmware *fw = NULL;
+	const u8 *fwdata;
+	const struct drm_edid *drm_edid;
+	int fwsize, builtin;
+
+	builtin = match_string(generic_edid_name, GENERIC_EDIDS, name);
+	if (builtin >= 0) {
+		fwdata = generic_edid[builtin];
+		fwsize = sizeof(generic_edid[builtin]);
+	} else {
+		int err;
+
+		err = request_firmware(&fw, name, connector->dev->dev);
+		if (err) {
+			drm_err(connector->dev,
+				"[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n",
+				connector->base.id, connector->name,
+				name, err);
+			return ERR_PTR(err);
+		}
+
+		fwdata = fw->data;
+		fwsize = fw->size;
+	}
+
+	drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded %s firmware EDID \"%s\"\n",
+		    connector->base.id, connector->name,
+		    builtin >= 0 ? "built-in" : "external", name);
+
+	drm_edid = drm_edid_alloc(fwdata, fwsize);
+	if (!drm_edid_valid(drm_edid)) {
+		drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name);
+		drm_edid_free(drm_edid);
+		drm_edid = ERR_PTR(-EINVAL);
+	}
+
+	release_firmware(fw);
+
+	return drm_edid;
+}
+
+const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector)
+{
+	char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
+	const struct drm_edid *drm_edid;
+
+	if (edid_firmware[0] == '\0')
+		return ERR_PTR(-ENOENT);
+
+	/*
+	 * If there are multiple edid files specified and separated
+	 * by commas, search through the list looking for one that
+	 * matches the connector.
+	 *
+	 * If there's one or more that doesn't specify a connector, keep
+	 * the last one found one as a fallback.
+	 */
+	fwstr = kstrdup(edid_firmware, GFP_KERNEL);
+	if (!fwstr)
+		return ERR_PTR(-ENOMEM);
+	edidstr = fwstr;
+
+	while ((edidname = strsep(&edidstr, ","))) {
+		colon = strchr(edidname, ':');
+		if (colon != NULL) {
+			if (strncmp(connector->name, edidname, colon - edidname))
+				continue;
+			edidname = colon + 1;
+			break;
+		}
+
+		if (*edidname != '\0') /* corner case: multiple ',' */
+			fallback = edidname;
+	}
+
+	if (!edidname) {
+		if (!fallback) {
+			kfree(fwstr);
+			return ERR_PTR(-ENOENT);
+		}
+		edidname = fallback;
+	}
+
+	last = edidname + strlen(edidname) - 1;
+	if (*last == '\n')
+		*last = '\0';
+
+	drm_edid = edid_load(connector, edidname);
+
+	kfree(fwstr);
+
+	return drm_edid;
+}