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da0df92b57
Broken monitors and/or broken graphic boards may send erroneous or no EDID data. This also applies to broken KVM devices that are unable to correctly forward the EDID data of the connected monitor but invent their own fantasy data. This patch allows to specify an EDID data set to be used instead of probing the monitor for it. It contains built-in data sets of frequently used screen resolutions. In addition, a particular EDID data set may be provided in the /lib/firmware directory and loaded via the firmware interface. The name is passed to the kernel as module parameter of the drm_kms_helper module either when loaded options drm_kms_helper edid_firmware=edid/1280x1024.bin or as kernel commandline parameter drm_kms_helper.edid_firmware=edid/1280x1024.bin It is also possible to restrict the usage of a specified EDID data set to a particular connector. This is done by prepending the name of the connector to the name of the EDID data set using the syntax edid_firmware=[<connector>:]<edid> such as, for example, edid_firmware=DVI-I-1:edid/1920x1080.bin in which case no other connector will be affected. The built-in data sets are Resolution Name -------------------------------- 1024x768 edid/1024x768.bin 1280x1024 edid/1280x1024.bin 1680x1050 edid/1680x1050.bin 1920x1080 edid/1920x1080.bin They are ignored, if a file with the same name is available in the /lib/firmware directory. The built-in EDID data sets are based on standard timings that may not apply to a particular monitor and even crash it. Ideally, EDID data of the connected monitor should be used. They may be obtained through the drm/cardX/cardX-<connector>/edid entry in the /sys/devices PCI directory of a correctly working graphics adapter. It is even possible to specify the name of an EDID data set on-the-fly via the /sys/module interface, e.g. echo edid/myedid.bin >/sys/module/drm_kms_helper/parameters/edid_firmware The new screen mode is considered when the related kernel function is called for the first time after the change. Such calls are made when the X server is started or when the display settings dialog is opened in an already running X server. Signed-off-by: Carsten Emde <C.Emde@osadl.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
251 lines
7.8 KiB
C
251 lines
7.8 KiB
C
/*
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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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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/module.h>
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#include <linux/firmware.h>
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#include "drmP.h"
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#include "drm_crtc.h"
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#include "drm_crtc_helper.h"
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#include "drm_edid.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, "Do not probe monitor, use specified EDID blob "
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"from built-in data or /lib/firmware instead. ");
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#define GENERIC_EDIDS 4
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static char *generic_edid_name[GENERIC_EDIDS] = {
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"edid/1024x768.bin",
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"edid/1280x1024.bin",
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"edid/1680x1050.bin",
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"edid/1920x1080.bin",
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};
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static u8 generic_edid[GENERIC_EDIDS][128] = {
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
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0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
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0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
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0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
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},
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
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0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
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0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
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0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
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},
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
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0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
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0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
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0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
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},
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
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0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
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0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
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0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
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},
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};
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static int edid_load(struct drm_connector *connector, char *name,
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char *connector_name)
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{
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const struct firmware *fw;
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struct platform_device *pdev;
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u8 *fwdata = NULL, *edid;
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int fwsize, expected;
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int builtin = 0, err = 0;
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int i, valid_extensions = 0;
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pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
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if (IS_ERR(pdev)) {
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DRM_ERROR("Failed to register EDID firmware platform device "
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"for connector \"%s\"\n", connector_name);
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err = -EINVAL;
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goto out;
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}
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err = request_firmware(&fw, name, &pdev->dev);
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platform_device_unregister(pdev);
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if (err) {
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i = 0;
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while (i < GENERIC_EDIDS && strcmp(name, generic_edid_name[i]))
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i++;
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if (i < GENERIC_EDIDS) {
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err = 0;
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builtin = 1;
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fwdata = generic_edid[i];
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fwsize = sizeof(generic_edid[i]);
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}
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}
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if (err) {
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DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
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name, err);
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goto out;
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}
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if (fwdata == NULL) {
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fwdata = (u8 *) fw->data;
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fwsize = fw->size;
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}
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expected = (fwdata[0x7e] + 1) * EDID_LENGTH;
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if (expected != fwsize) {
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DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
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"(expected %d, got %d)\n", name, expected, (int) fwsize);
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err = -EINVAL;
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goto relfw_out;
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}
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edid = kmalloc(fwsize, GFP_KERNEL);
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if (edid == NULL) {
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err = -ENOMEM;
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goto relfw_out;
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}
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memcpy(edid, fwdata, fwsize);
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if (!drm_edid_block_valid(edid)) {
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DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
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name);
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kfree(edid);
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err = -EINVAL;
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goto relfw_out;
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}
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for (i = 1; i <= edid[0x7e]; i++) {
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if (i != valid_extensions + 1)
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memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
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edid + i * EDID_LENGTH, EDID_LENGTH);
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if (drm_edid_block_valid(edid + i * EDID_LENGTH))
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valid_extensions++;
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}
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if (valid_extensions != edid[0x7e]) {
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edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
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DRM_INFO("Found %d valid extensions instead of %d in EDID data "
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"\"%s\" for connector \"%s\"\n", valid_extensions,
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edid[0x7e], name, connector_name);
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edid[0x7e] = valid_extensions;
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edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
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GFP_KERNEL);
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if (edid == NULL) {
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err = -ENOMEM;
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goto relfw_out;
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}
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}
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connector->display_info.raw_edid = edid;
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DRM_INFO("Got %s EDID base block and %d extension%s from "
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"\"%s\" for connector \"%s\"\n", builtin ? "built-in" :
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"external", valid_extensions, valid_extensions == 1 ? "" : "s",
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name, connector_name);
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relfw_out:
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release_firmware(fw);
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out:
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return err;
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}
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int drm_load_edid_firmware(struct drm_connector *connector)
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{
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char *connector_name = drm_get_connector_name(connector);
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char *edidname = edid_firmware, *last, *colon;
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int ret = 0;
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if (*edidname == '\0')
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return ret;
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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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return ret;
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edidname = colon + 1;
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if (*edidname == '\0')
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return ret;
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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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ret = edid_load(connector, edidname, connector_name);
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if (ret)
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return 0;
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drm_mode_connector_update_edid_property(connector,
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(struct edid *) connector->display_info.raw_edid);
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return drm_add_edid_modes(connector, (struct edid *)
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connector->display_info.raw_edid);
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}
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