1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_panel_backlight_quirks.c b/drivers/gpu/drm/drm_panel_backlight_quirks.c
new file mode 100644
index 000000000000..537dc6dd0534
--- /dev/null
+++ b/drivers/gpu/drm/drm_panel_backlight_quirks.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/array_size.h>
+#include <linux/dmi.h>
+#include <linux/export.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_utils.h>
+
+struct drm_panel_match {
+	enum dmi_field field;
+	const char * const value;
+};
+
+struct drm_get_panel_backlight_quirk {
+	struct drm_panel_match dmi_match;
+	struct drm_panel_match dmi_match_other;
+	struct drm_edid_ident ident;
+	struct drm_panel_backlight_quirk quirk;
+};
+
+static const struct drm_get_panel_backlight_quirk drm_panel_min_backlight_quirks[] = {
+	/* 13 inch matte panel */
+	{
+		.dmi_match.field = DMI_BOARD_VENDOR,
+		.dmi_match.value = "Framework",
+		.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0bca),
+		.ident.name = "NE135FBM-N41",
+		.quirk = { .min_brightness = 1, },
+	},
+	/* 13 inch glossy panel */
+	{
+		.dmi_match.field = DMI_BOARD_VENDOR,
+		.dmi_match.value = "Framework",
+		.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x095f),
+		.ident.name = "NE135FBM-N41",
+		.quirk = { .min_brightness = 1, },
+	},
+	/* 13 inch 2.8k panel */
+	{
+		.dmi_match.field = DMI_BOARD_VENDOR,
+		.dmi_match.value = "Framework",
+		.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0cb4),
+		.ident.name = "NE135A1M-NY1",
+		.quirk = { .min_brightness = 1, },
+	},
+	/* Steam Deck models */
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "Valve",
+		.dmi_match_other.field = DMI_PRODUCT_NAME,
+		.dmi_match_other.value = "Jupiter",
+		.quirk = { .min_brightness = 1, },
+	},
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "Valve",
+		.dmi_match_other.field = DMI_PRODUCT_NAME,
+		.dmi_match_other.value = "Galileo",
+		.quirk = { .min_brightness = 1, },
+	},
+	/* Have OLED Panels with brightness issue when last byte is 0/1 */
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "AYANEO",
+		.dmi_match_other.field = DMI_PRODUCT_NAME,
+		.dmi_match_other.value = "AYANEO 3",
+		.quirk = { .brightness_mask = 3, },
+	},
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "ZOTAC",
+		.dmi_match_other.field = DMI_BOARD_NAME,
+		.dmi_match_other.value = "G0A1W",
+		.quirk = { .brightness_mask = 3, },
+	},
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "ZOTAC",
+		.dmi_match_other.field = DMI_BOARD_NAME,
+		.dmi_match_other.value = "G1A1W",
+		.quirk = { .brightness_mask = 3, },
+	},
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "ONE-NETBOOK",
+		.dmi_match_other.field = DMI_PRODUCT_NAME,
+		.dmi_match_other.value = "ONEXPLAYER F1Pro",
+		.quirk = { .brightness_mask = 3, },
+	},
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "ONE-NETBOOK",
+		.dmi_match_other.field = DMI_PRODUCT_NAME,
+		.dmi_match_other.value = "ONEXPLAYER F1 EVA-02",
+		.quirk = { .brightness_mask = 3, },
+	},
+};
+
+static bool drm_panel_min_backlight_quirk_matches(
+	const struct drm_get_panel_backlight_quirk *quirk,
+	const struct drm_edid *edid)
+{
+	if (quirk->dmi_match.field &&
+	    !dmi_match(quirk->dmi_match.field, quirk->dmi_match.value))
+		return false;
+
+	if (quirk->dmi_match_other.field &&
+	    !dmi_match(quirk->dmi_match_other.field,
+		       quirk->dmi_match_other.value))
+		return false;
+
+	if (quirk->ident.panel_id && !drm_edid_match(edid, &quirk->ident))
+		return false;
+
+	return true;
+}
+
+/**
+ * drm_get_panel_backlight_quirk - Get backlight quirks for a panel
+ * @edid: EDID of the panel to check
+ *
+ * This function checks for platform specific (e.g. DMI based) quirks
+ * providing info on the minimum backlight brightness for systems where this
+ * cannot be probed correctly from the hard-/firm-ware and other sources.
+ *
+ * Returns:
+ * a drm_panel_backlight_quirk struct if a quirk was found, otherwise an
+ * error pointer.
+ */
+const struct drm_panel_backlight_quirk *
+drm_get_panel_backlight_quirk(const struct drm_edid *edid)
+{
+	const struct drm_get_panel_backlight_quirk *quirk;
+	size_t i;
+
+	if (!IS_ENABLED(CONFIG_DMI))
+		return ERR_PTR(-ENODATA);
+
+	if (!edid)
+		return ERR_PTR(-EINVAL);
+
+	for (i = 0; i < ARRAY_SIZE(drm_panel_min_backlight_quirks); i++) {
+		quirk = &drm_panel_min_backlight_quirks[i];
+
+		if (drm_panel_min_backlight_quirk_matches(quirk, edid))
+			return &quirk->quirk;
+	}
+
+	return ERR_PTR(-ENODATA);
+}
+EXPORT_SYMBOL(drm_get_panel_backlight_quirk);
+
+MODULE_DESCRIPTION("Quirks for panel backlight overrides");
+MODULE_LICENSE("GPL");