108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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drm_edid_load.c: use a built-in EDID data set or load it via the firmware
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interface
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Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>
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*/
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#include <linux/firmware.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_edid.h>
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#include <drm/drm_print.h>
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#include "drm_crtc_internal.h"
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static char edid_firmware[PATH_MAX];
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module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
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MODULE_PARM_DESC(edid_firmware,
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"Do not probe monitor, use specified EDID blob from /lib/firmware instead.");
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static const struct drm_edid *edid_load(struct drm_connector *connector, const char *name)
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{
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const struct firmware *fw = NULL;
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const struct drm_edid *drm_edid;
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int err;
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err = request_firmware(&fw, name, connector->dev->dev);
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if (err) {
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drm_err(connector->dev,
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"[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n",
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connector->base.id, connector->name,
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name, err);
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return ERR_PTR(err);
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}
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drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded external firmware EDID \"%s\"\n",
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connector->base.id, connector->name, name);
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drm_edid = drm_edid_alloc(fw->data, fw->size);
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if (!drm_edid_valid(drm_edid)) {
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drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name);
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drm_edid_free(drm_edid);
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drm_edid = ERR_PTR(-EINVAL);
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}
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release_firmware(fw);
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return drm_edid;
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}
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const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector)
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{
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char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
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const struct drm_edid *drm_edid;
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if (edid_firmware[0] == '\0')
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return ERR_PTR(-ENOENT);
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/*
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* If there are multiple edid files specified and separated
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* by commas, search through the list looking for one that
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* matches the connector.
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*
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* If there's one or more that doesn't specify a connector, keep
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* the last one found one as a fallback.
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*/
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fwstr = kstrdup(edid_firmware, GFP_KERNEL);
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if (!fwstr)
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return ERR_PTR(-ENOMEM);
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edidstr = fwstr;
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while ((edidname = strsep(&edidstr, ","))) {
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colon = strchr(edidname, ':');
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if (colon != NULL) {
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if (strncmp(connector->name, edidname, colon - edidname))
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continue;
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edidname = colon + 1;
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break;
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}
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if (*edidname != '\0') /* corner case: multiple ',' */
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fallback = edidname;
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}
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if (!edidname) {
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if (!fallback) {
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kfree(fwstr);
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return ERR_PTR(-ENOENT);
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}
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edidname = fallback;
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}
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last = edidname + strlen(edidname) - 1;
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if (*last == '\n')
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*last = '\0';
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drm_edid = edid_load(connector, edidname);
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kfree(fwstr);
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return drm_edid;
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}
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