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| 3 | drm_edid_load.c: use a built-in EDID data set or load it via the firmware
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| 4 | interface
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| 5 |
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| 6 | Copyright (C) 2012 Carsten Emde <[email protected]>
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| 7 |
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| 8 |
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| 9 |
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| 10 | #include <linux/firmware.h>
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| 11 | #include <linux/module.h>
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| 12 | #include <linux/platform_device.h>
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| 13 |
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| 14 | #include <drm/drm_connector.h>
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| 15 | #include <drm/drm_drv.h>
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| 16 | #include <drm/drm_edid.h>
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| 17 | #include <drm/drm_print.h>
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| 18 |
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| 19 | #include "drm_crtc_internal.h"
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| 20 |
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| 21 | static char edid_firmware[PATH_MAX];
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| 22 | module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
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| 23 | MODULE_PARM_DESC(edid_firmware,
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| 24 | "Do not probe monitor, use specified EDID blob from /lib/firmware instead.");
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| 25 |
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| 26 | static const struct drm_edid *edid_load(struct drm_connector *connector, const char *name)
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| 27 | {
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| 28 | const struct firmware *fw = NULL;
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| 29 | const struct drm_edid *drm_edid;
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| 30 | int err;
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| 31 |
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| 32 | err = request_firmware(&fw, name, connector->dev->dev);
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| 33 | if (err) {
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| 34 | drm_err(connector->dev,
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| 35 | "[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n",
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| 36 | connector->base.id, connector->name,
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| 37 | name, err);
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| 38 | return ERR_PTR(err);
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| 39 | }
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| 40 |
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| 41 | drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded external firmware EDID \"%s\"\n",
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| 42 | connector->base.id, connector->name, name);
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| 43 |
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| 44 | drm_edid = drm_edid_alloc(fw->data, fw->size);
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| 45 | if (!drm_edid_valid(drm_edid)) {
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| 46 | drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name);
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| 47 | drm_edid_free(drm_edid);
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| 48 | drm_edid = ERR_PTR(-EINVAL);
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| 49 | }
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| 50 |
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| 51 | release_firmware(fw);
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| 52 |
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| 53 | return drm_edid;
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| 54 | }
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| 55 |
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| 56 | const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector)
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| 57 | {
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| 58 | char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
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| 59 | const struct drm_edid *drm_edid;
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| 60 |
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| 61 | if (edid_firmware[0] == '\0')
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| 62 | return ERR_PTR(-ENOENT);
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| 63 |
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| 64 | |
| 65 | * If there are multiple edid files specified and separated
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| 66 | * by commas, search through the list looking for one that
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| 67 | * matches the connector.
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| 68 | *
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| 69 | * If there's one or more that doesn't specify a connector, keep
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| 70 | * the last one found one as a fallback.
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| 71 |
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| 72 | fwstr = kstrdup(edid_firmware, GFP_KERNEL);
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| 73 | if (!fwstr)
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| 74 | return ERR_PTR(-ENOMEM);
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| 75 | edidstr = fwstr;
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| 76 |
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| 77 | while ((edidname = strsep(&edidstr, ","))) {
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| 78 | colon = strchr(edidname, ':');
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| 79 | if (colon != NULL) {
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| 80 | if (strncmp(connector->name, edidname, colon - edidname))
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| 81 | continue;
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| 82 | edidname = colon + 1;
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| 83 | break;
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| 84 | }
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| 85 |
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| 86 | if (*edidname != '\0')
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| 87 | fallback = edidname;
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| 88 | }
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| 89 |
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| 90 | if (!edidname) {
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| 91 | if (!fallback) {
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| 92 | kfree(fwstr);
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| 93 | return ERR_PTR(-ENOENT);
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| 94 | }
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| 95 | edidname = fallback;
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| 96 | }
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| 97 |
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| 98 | last = edidname + strlen(edidname) - 1;
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| 99 | if (*last == '\n')
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| 100 | *last = '\0';
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| 101 |
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| 102 | drm_edid = edid_load(connector, edidname);
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| 103 |
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| 104 | kfree(fwstr);
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| 105 |
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| 106 | return drm_edid;
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| 107 | }
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