linux-t2-patches/2008-i915-4-lane-quirk-for-mbp15-1.patch at main · t2linux/linux-t2-patches · GitHub

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From 8a84123c2f8619a14f9fc493db2528e59fcc0db8 Mon Sep 17 00:00:00 2001
From: Orlando Chamberlain <orlandoch.dev@gmail.com>
Date: Fri, 28 Jun 2024 04:43:50 +0000
Subject: [PATCH 8/9] i915: 4 lane quirk for mbp15,1

Needed to use iGPU when dGPU was boot GPU

Patch written by Kerem Karabay <kekrby@gmail.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c    |  4 ++++
 drivers/gpu/drm/i915/display/intel_quirks.c | 15 +++++++++++++++
 drivers/gpu/drm/i915/display/intel_quirks.h |  1 +
 3 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 49b5cc01c..1435f49f2 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4693,6 +4694,9 @@ static bool intel_ddi_a_force_4_lanes(struct intel_digital_port *dig_port)
 	if (dig_port->ddi_a_4_lanes)
 		return false;

+	if (intel_has_quirk(display, QUIRK_DDI_A_FORCE_4_LANES))
+		return true;
+
 	/* Broxton/Geminilake: Bspec says that DDI_A_4_LANES is the only
 	 *                     supported configuration
 	 */
diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/drivers/gpu/drm/i915/display/intel_quirks.c
index 28f497ae7..c2952b0f8 100644
--- a/drivers/gpu/drm/i915/display/intel_quirks.c
+++ b/drivers/gpu/drm/i915/display/intel_quirks.c
@@ -64,6 +64,18 @@ static void quirk_increase_ddi_disabled_time(struct intel_display *display)
 	drm_info(display->drm, "Applying Increase DDI Disabled quirk\n");
 }

+/*
+ * In some cases, the firmware might not set the lane count to 4 (for example,
+ * when booting in some dual GPU Macs with the dGPU as the default GPU), this
+ * quirk is used to force it as otherwise it might not be possible to compute a
+ * valid link configuration.
+ */
+static void quirk_ddi_a_force_4_lanes(struct intel_display *display)
+{
+	intel_set_quirk(display, QUIRK_DDI_A_FORCE_4_LANES);
+	drm_info(display->drm, "Applying DDI A Forced 4 Lanes quirk\n");
+}
+
 static void quirk_no_pps_backlight_power_hook(struct intel_display *display)
 {
 	intel_set_quirk(display, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK);
@@ -229,6 +241,9 @@ static struct intel_quirk intel_quirks[] = {

 	/* Dell XPS 13 7390 2-in-1 */
 	{ 0x8a52, 0x1028, 0x08b0, quirk_edp_limit_rate_hbr2 },
+
+	/* Apple MacBookPro15,1 */
+	{ 0x3e9b, 0x106b, 0x0176, quirk_ddi_a_force_4_lanes },
 };

 static const struct intel_dpcd_quirk intel_dpcd_quirks[] = {
diff --git a/drivers/gpu/drm/i915/display/intel_quirks.h b/drivers/gpu/drm/i915/display/intel_quirks.h
index cafdebda7..a5296f827 100644
--- a/drivers/gpu/drm/i915/display/intel_quirks.h
+++ b/drivers/gpu/drm/i915/display/intel_quirks.h
@@ -20,6 +20,7 @@ enum intel_quirk_id {
 	QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK,
 	QUIRK_FW_SYNC_LEN,
 	QUIRK_EDP_LIMIT_RATE_HBR2,
+	QUIRK_DDI_A_FORCE_4_LANES,
 };

 void intel_init_quirks(struct intel_display *display);
--
2.48.1