linux-kernel - [PATCH v1 1/2] drm/panel-edp: Add override bpc quirk for generic edp

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Message-Id: <20251029081048.162374-2-ajye_huang@compal.corp-partner.google.com>
Date: Wed, 29 Oct 2025 16:10:47 +0800
From: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
To: linux-kernel@...r.kernel.org
Cc: Douglas Anderson <dianders@...omium.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Jessica Zhang <jesszhan0024@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	Ajye Huang <ajye_huang@...pal.corp-partner.google.com>,
	jazhan@...gle.com
Subject: [PATCH v1 1/2] drm/panel-edp: Add override bpc quirk for generic edp

Adding override bpc to EDP_PANEL_ENTRY3 quirk.

Signed-off-by: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
---
 drivers/gpu/drm/panel/panel-edp.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
index 944c7c70de55..da3e8f223ec3 100644
--- a/drivers/gpu/drm/panel/panel-edp.c
+++ b/drivers/gpu/drm/panel/panel-edp.c
@@ -218,6 +218,9 @@ struct edp_panel_entry {
 
 	/** @override_edid_mode: Override the mode obtained by edid. */
 	const struct drm_display_mode *override_edid_mode;
+
+	/** @override_bpc: Override the Bits per color obtained by edid. */
+	unsigned int override_bpc;
 };
 
 struct panel_edp {
@@ -586,6 +589,9 @@ static int panel_edp_get_modes(struct drm_panel *panel,
 	bool has_override_edid_mode = p->detected_panel &&
 				      p->detected_panel != ERR_PTR(-EINVAL) &&
 				      p->detected_panel->override_edid_mode;
+	bool has_override_bpc = p->detected_panel &&
+				      p->detected_panel != ERR_PTR(-EINVAL) &&
+				      p->detected_panel->override_bpc;
 
 	/* probe EDID if a DDC bus is available */
 	if (p->ddc) {
@@ -611,6 +617,9 @@ static int panel_edp_get_modes(struct drm_panel *panel,
 			} else {
 				num += drm_edid_connector_add_modes(connector);
 			}
+
+			if (has_override_bpc)
+				connector->display_info.bpc = p->detected_panel->override_bpc;
 		}
 
 		pm_runtime_mark_last_busy(panel->dev);
@@ -1871,6 +1880,17 @@ static const struct panel_delay delay_80_500_e50_d50 = {
 	.override_edid_mode = _mode \
 }
 
+#define EDP_PANEL_ENTRY3(vend_chr_0, vend_chr_1, vend_chr_2, product_id, _delay, _name, _bpc) \
+{ \
+	.ident = { \
+		.name = _name, \
+		.panel_id = drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, vend_chr_2, \
+						     product_id), \
+	}, \
+	.delay = _delay, \
+	.override_bpc = _bpc \
+}
+
 /*
  * This table is used to figure out power sequencing delays for panels that
  * are detected by EDID. Entries here may point to entries in the
-- 
2.25.1