drm_panel_backlight_quirks.c

  1// SPDX-License-Identifier: GPL-2.0
  2
  3#include <linux/array_size.h>
  4#include <linux/dmi.h>
  5#include <linux/export.h>
  6#include <linux/mod_devicetable.h>
  7#include <linux/module.h>
  8#include <drm/drm_edid.h>
  9#include <drm/drm_utils.h>
 10
 11struct drm_panel_match {
 12	enum dmi_field field;
 13	const char * const value;
 14};
 15
 16struct drm_get_panel_backlight_quirk {
 17	struct drm_panel_match dmi_match;
 18	struct drm_panel_match dmi_match_other;
 19	struct drm_edid_ident ident;
 20	struct drm_panel_backlight_quirk quirk;
 21};
 22
 23static const struct drm_get_panel_backlight_quirk drm_panel_min_backlight_quirks[] = {
 24	/* 13 inch matte panel */
 25	{
 26		.dmi_match.field = DMI_BOARD_VENDOR,
 27		.dmi_match.value = "Framework",
 28		.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0bca),
 29		.ident.name = "NE135FBM-N41",
 30		.quirk = { .min_brightness = 1, },
 31	},
 32	/* 13 inch glossy panel */
 33	{
 34		.dmi_match.field = DMI_BOARD_VENDOR,
 35		.dmi_match.value = "Framework",
 36		.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x095f),
 37		.ident.name = "NE135FBM-N41",
 38		.quirk = { .min_brightness = 1, },
 39	},
 40	/* 13 inch 2.8k panel */
 41	{
 42		.dmi_match.field = DMI_BOARD_VENDOR,
 43		.dmi_match.value = "Framework",
 44		.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0cb4),
 45		.ident.name = "NE135A1M-NY1",
 46		.quirk = { .min_brightness = 1, },
 47	},
 48	/* Steam Deck models */
 49	{
 50		.dmi_match.field = DMI_SYS_VENDOR,
 51		.dmi_match.value = "Valve",
 52		.dmi_match_other.field = DMI_PRODUCT_NAME,
 53		.dmi_match_other.value = "Jupiter",
 54		.quirk = { .min_brightness = 1, },
 55	},
 56	{
 57		.dmi_match.field = DMI_SYS_VENDOR,
 58		.dmi_match.value = "Valve",
 59		.dmi_match_other.field = DMI_PRODUCT_NAME,
 60		.dmi_match_other.value = "Galileo",
 61		.quirk = { .min_brightness = 1, },
 62	},
 63	/* Have OLED Panels with brightness issue when last byte is 0/1 */
 64	{
 65		.dmi_match.field = DMI_SYS_VENDOR,
 66		.dmi_match.value = "AYANEO",
 67		.dmi_match_other.field = DMI_PRODUCT_NAME,
 68		.dmi_match_other.value = "AYANEO 3",
 69		.quirk = { .brightness_mask = 3, },
 70	},
 71	{
 72		.dmi_match.field = DMI_SYS_VENDOR,
 73		.dmi_match.value = "ZOTAC",
 74		.dmi_match_other.field = DMI_BOARD_NAME,
 75		.dmi_match_other.value = "G0A1W",
 76		.quirk = { .brightness_mask = 3, },
 77	},
 78	{
 79		.dmi_match.field = DMI_SYS_VENDOR,
 80		.dmi_match.value = "ZOTAC",
 81		.dmi_match_other.field = DMI_BOARD_NAME,
 82		.dmi_match_other.value = "G1A1W",
 83		.quirk = { .brightness_mask = 3, },
 84	},
 85	{
 86		.dmi_match.field = DMI_SYS_VENDOR,
 87		.dmi_match.value = "ONE-NETBOOK",
 88		.dmi_match_other.field = DMI_PRODUCT_NAME,
 89		.dmi_match_other.value = "ONEXPLAYER F1Pro",
 90		.quirk = { .brightness_mask = 3, },
 91	},
 92	{
 93		.dmi_match.field = DMI_SYS_VENDOR,
 94		.dmi_match.value = "ONE-NETBOOK",
 95		.dmi_match_other.field = DMI_PRODUCT_NAME,
 96		.dmi_match_other.value = "ONEXPLAYER F1 EVA-02",
 97		.quirk = { .brightness_mask = 3, },
 98	},
 99};
100
101static bool drm_panel_min_backlight_quirk_matches(
102	const struct drm_get_panel_backlight_quirk *quirk,
103	const struct drm_edid *edid)
104{
105	if (quirk->dmi_match.field &&
106	    !dmi_match(quirk->dmi_match.field, quirk->dmi_match.value))
107		return false;
108
109	if (quirk->dmi_match_other.field &&
110	    !dmi_match(quirk->dmi_match_other.field,
111		       quirk->dmi_match_other.value))
112		return false;
113
114	if (quirk->ident.panel_id && !drm_edid_match(edid, &quirk->ident))
115		return false;
116
117	return true;
118}
119
120/**
121 * drm_get_panel_backlight_quirk - Get backlight quirks for a panel
122 * @edid: EDID of the panel to check
123 *
124 * This function checks for platform specific (e.g. DMI based) quirks
125 * providing info on the minimum backlight brightness for systems where this
126 * cannot be probed correctly from the hard-/firm-ware and other sources.
127 *
128 * Returns:
129 * a drm_panel_backlight_quirk struct if a quirk was found, otherwise an
130 * error pointer.
131 */
132const struct drm_panel_backlight_quirk *
133drm_get_panel_backlight_quirk(const struct drm_edid *edid)
134{
135	const struct drm_get_panel_backlight_quirk *quirk;
136	size_t i;
137
138	if (!IS_ENABLED(CONFIG_DMI))
139		return ERR_PTR(-ENODATA);
140
141	if (!edid)
142		return ERR_PTR(-EINVAL);
143
144	for (i = 0; i < ARRAY_SIZE(drm_panel_min_backlight_quirks); i++) {
145		quirk = &drm_panel_min_backlight_quirks[i];
146
147		if (drm_panel_min_backlight_quirk_matches(quirk, edid))
148			return &quirk->quirk;
149	}
150
151	return ERR_PTR(-ENODATA);
152}
153EXPORT_SYMBOL(drm_get_panel_backlight_quirk);
154
155MODULE_DESCRIPTION("Quirks for panel backlight overrides");
156MODULE_LICENSE("GPL");