1 /* SPDX-License-Identifier: MIT */
3 * drm_panel_orientation_quirks.c -- Quirks for non-normal panel orientation
7 * Note the quirks in this file are shared with fbdev/efifb and as such
8 * must not depend on other drm code.
11 #include <linux/dmi.h>
12 #include <linux/module.h>
13 #include <drm/drm_connector.h>
14 #include <drm/drm_utils.h>
19 * Some x86 clamshell design devices use portrait tablet screens and a display
20 * engine which cannot rotate in hardware, so we need to rotate the fbcon to
21 * compensate. Unfortunately these (cheap) devices also typically have quite
22 * generic DMI data, so we match on a combination of DMI data, screen resolution
23 * and a list of known BIOS dates to avoid false positives.
26 struct drm_dmi_panel_orientation_data {
29 const char * const *bios_dates;
33 static const struct drm_dmi_panel_orientation_data asus_t100ha = {
36 .orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP,
39 static const struct drm_dmi_panel_orientation_data gpd_pocket = {
42 .bios_dates = (const char * const []){ "05/26/2017", "06/28/2017",
43 "07/05/2017", "08/07/2017", NULL },
44 .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
47 static const struct drm_dmi_panel_orientation_data gpd_win = {
50 .bios_dates = (const char * const []){
51 "10/25/2016", "11/18/2016", "12/23/2016", "12/26/2016",
52 "02/21/2017", "03/20/2017", "05/25/2017", NULL },
53 .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
56 static const struct drm_dmi_panel_orientation_data itworks_tw891 = {
59 .bios_dates = (const char * const []){ "10/16/2015", NULL },
60 .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
63 static const struct drm_dmi_panel_orientation_data vios_lth17 = {
66 .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
69 static const struct dmi_system_id orientation_data[] = {
72 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
73 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100HAN"),
75 .driver_data = (void *)&asus_t100ha,
77 * GPD Pocket, note that the the DMI data is less generic then
78 * it seems, devices with a board-vendor of "AMI Corporation"
79 * are quite rare, as are devices which have both board- *and*
80 * product-id set to "Default String"
83 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
84 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
85 DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
86 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
88 .driver_data = (void *)&gpd_pocket,
89 }, { /* GPD Win (same note on DMI match as GPD Pocket) */
91 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
92 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
93 DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
94 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
96 .driver_data = (void *)&gpd_win,
97 }, { /* I.T.Works TW891 */
99 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "To be filled by O.E.M."),
100 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "TW891"),
101 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
102 DMI_EXACT_MATCH(DMI_BOARD_NAME, "TW891"),
104 .driver_data = (void *)&itworks_tw891,
105 }, { /* VIOS LTH17 */
107 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "VIOS"),
108 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "LTH17"),
110 .driver_data = (void *)&vios_lth17,
116 * drm_get_panel_orientation_quirk - Check for panel orientation quirks
117 * @width: width in pixels of the panel
118 * @height: height in pixels of the panel
120 * This function checks for platform specific (e.g. DMI based) quirks
121 * providing info on panel_orientation for systems where this cannot be
122 * probed from the hard-/firm-ware. To avoid false-positive this function
123 * takes the panel resolution as argument and checks that against the
124 * resolution expected by the quirk-table entry.
126 * Note this function is also used outside of the drm-subsys, by for example
127 * the efifb code. Because of this this function gets compiled into its own
128 * kernel-module when built as a module.
131 * A DRM_MODE_PANEL_ORIENTATION_* value if there is a quirk for this system,
132 * or DRM_MODE_PANEL_ORIENTATION_UNKNOWN if there is no quirk.
134 int drm_get_panel_orientation_quirk(int width, int height)
136 const struct dmi_system_id *match;
137 const struct drm_dmi_panel_orientation_data *data;
138 const char *bios_date;
141 for (match = dmi_first_match(orientation_data);
143 match = dmi_first_match(match + 1)) {
144 data = match->driver_data;
146 if (data->width != width ||
147 data->height != height)
150 if (!data->bios_dates)
151 return data->orientation;
153 bios_date = dmi_get_system_info(DMI_BIOS_DATE);
157 for (i = 0; data->bios_dates[i]; i++) {
158 if (!strcmp(data->bios_dates[i], bios_date))
159 return data->orientation;
163 return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
165 EXPORT_SYMBOL(drm_get_panel_orientation_quirk);
169 /* There are no quirks for non x86 devices yet */
170 int drm_get_panel_orientation_quirk(int width, int height)
172 return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
174 EXPORT_SYMBOL(drm_get_panel_orientation_quirk);
178 MODULE_LICENSE("Dual MIT/GPL");