diff --git a/arch/arm64/boot/dts/apple/t8122-j504.dts b/arch/arm64/boot/dts/apple/t8122-j504.dts
index 4c36e01bae6412..818ab8d786b7b7 100644
--- a/arch/arm64/boot/dts/apple/t8122-j504.dts
+++ b/arch/arm64/boot/dts/apple/t8122-j504.dts
@@ -31,6 +31,26 @@
 	};
 };
 
+&dcp {
+	panel: panel {
+		compatible = "apple,panel-j504", "apple,panel-mini-led", "apple,panel";
+		/*
+		 * The J514S panel: 3024x1964 at 254 ppi; 189 mm high without the
+		 * 74 notch rows. The J504 boot framebuffer is 3024x1890 below them.
+		 */
+		width-mm = <302>;
+		height-mm = <196>;
+		adj-height-mm = <189>;
+		apple,max-brightness = <500>;
+	};
+};
+
+/* The boot framebuffer is the same panel, as on the J613 (HiDPI scale for simpledrm). */
+&framebuffer0 {
+	panel = <&panel>;
+	post-init-providers = <&panel>;
+};
+
 &wifi0 {
 	brcm,board-type = "apple,tresco";
 };
diff --git a/drivers/gpu/drm/apple/iomfb_v14_7.c b/drivers/gpu/drm/apple/iomfb_v14_7.c
index e540ba355f8298..6a20b9add7b3bb 100644
--- a/drivers/gpu/drm/apple/iomfb_v14_7.c
+++ b/drivers/gpu/drm/apple/iomfb_v14_7.c
@@ -140,6 +140,31 @@ static const struct dcp_v14_board dcp_v14_board_j615 = {
 	.ctm_get = A(420),
 };
 
+/*
+ * J504 (MacBook Pro 14", M3): the J613 DCP image on the same T8122 DCP (the
+ * J504 ADT names it), driving the 14" mini-LED panel of the J514S: 3024x1964
+ * with 74 notch rows above the 3024x1890 boot framebuffer, at 60 or 120 Hz.
+ * The colour matrix methods are this image's, and so is the panel level
+ * block the J613 qualified (brightness in nits, 500 at most here). Its swaps
+ * keep zero timestamps as on the Airs. Every panel timing and the
+ * display clock are logged for the first boots.
+ */
+static const struct dcp_v14_board dcp_v14_board_j504 = {
+	.name = "J504",
+	.debugfs = "dcp-j504",
+	.dcp_compatible = "apple,t8122-dcp",
+	.machine = "apple,j504",
+	.firmware_uuid = DCP_V14_J613_FIRMWARE_UUID,
+	.handoff = "apple,t8122-handoff",
+	.panel_width = 3024,
+	.panel_height = 1964,
+	.promotion = true,
+	.log_bringup = true,
+	.panel_nits = true,
+	.ctm_set = A(421),
+	.ctm_get = A(420),
+};
+
 /*
  * J516C (MacBook Pro 16", M3 Max): the J516S panel, 3456x2234 with 74 notch
  * rows above the 3456x2160 boot framebuffer, at 60 or 120 Hz, on the T6031
@@ -194,6 +219,7 @@ static const struct dcp_v14_board *const dcp_v14_boards[] = {
 	&dcp_v14_board_t6030,
 	&dcp_v14_board_j613,
 	&dcp_v14_board_j615,
+	&dcp_v14_board_j504,
 	&dcp_v14_board_j516c,
 	&dcp_v14_board_j514c,
 };
@@ -1698,7 +1724,8 @@ static bool dcp_v14_panel_nits_admit(const struct dcp_v14_board *board,
 {
 	return board && board->panel_nits &&
 		(machine_is(ctx, "apple,j514s") || machine_is(ctx, "apple,j516s") ||
-		 machine_is(ctx, "apple,j516c") || machine_is(ctx, "apple,j613"));
+		 machine_is(ctx, "apple,j516c") || machine_is(ctx, "apple,j613") ||
+		 machine_is(ctx, "apple,j504"));
 }
 
 const char *iomfb_v14_7_board_name(const struct dcp_v14_board *board)
diff --git a/drivers/gpu/drm/apple/iomfb_v14_7_backlight_test.c b/drivers/gpu/drm/apple/iomfb_v14_7_backlight_test.c
index 3c1fc2f45d534e..6f1b6ad2bfe967 100644
--- a/drivers/gpu/drm/apple/iomfb_v14_7_backlight_test.c
+++ b/drivers/gpu/drm/apple/iomfb_v14_7_backlight_test.c
@@ -122,13 +122,14 @@ static bool v14_bl_ctx_machine_is(const void *ctx, const char *compat)
 	return !strcmp(((const char *const *)ctx)[1], compat);
 }
 
-/* Only admitted T6030, J516C and J613 internal panels carry levels. */
+/* Only admitted T6030, J516C, J613 and J504 internal panels carry levels. */
 static void v14_bl_boards(struct kunit *test)
 {
 	static const char *const t6030_j516s[] = { "apple,t6030-dcp", "apple,j516s" };
 	static const char *const t6030_j514s[] = { "apple,t6030-dcp", "apple,j514s" };
 	static const char *const j613[] = { "apple,t8122-dcp", "apple,j613" };
 	static const char *const j615[] = { "apple,t8122-dcp", "apple,j615" };
+	static const char *const j504[] = { "apple,t8122-dcp", "apple,j504" };
 	static const char *const j516c[] = { "apple,t6031-dcp", "apple,j516c" };
 	static const char *const other_t6030[] = { "apple,t6030-dcp", "apple,other" };
 	const struct dcp_v14_board *board;
@@ -156,6 +157,11 @@ static void v14_bl_boards(struct kunit *test)
 	board = dcp_v14_board_select(v14_bl_ctx_dcp_is, v14_bl_ctx_machine_is, j615, &known);
 	KUNIT_ASSERT_NOT_NULL(test, board);
 	KUNIT_EXPECT_FALSE(test, board->panel_nits);
+	board = dcp_v14_board_select(v14_bl_ctx_dcp_is, v14_bl_ctx_machine_is, j504, &known);
+	KUNIT_ASSERT_NOT_NULL(test, board);
+	KUNIT_EXPECT_TRUE(test, board->panel_nits);
+	KUNIT_EXPECT_TRUE(test, dcp_v14_panel_nits_admit(board, v14_bl_ctx_machine_is, j504));
+	KUNIT_EXPECT_FALSE(test, dcp_v14_panel_nits_admit(board, v14_bl_ctx_machine_is, j615));
 	board = dcp_v14_board_select(v14_bl_ctx_dcp_is, v14_bl_ctx_machine_is, j516c, &known);
 	KUNIT_ASSERT_NOT_NULL(test, board);
 	KUNIT_EXPECT_TRUE(test, board->panel_nits);
diff --git a/drivers/gpu/drm/apple/v14-board-test.c b/drivers/gpu/drm/apple/v14-board-test.c
index 98df7dfab36ea8..f6202c07e39b03 100644
--- a/drivers/gpu/drm/apple/v14-board-test.c
+++ b/drivers/gpu/drm/apple/v14-board-test.c
@@ -54,6 +54,8 @@ static const char *const j514c[] = { "apple,j514c", "apple,t6031", "apple,arm-pl
 static const char *const j516m[] = { "apple,j516m", "apple,t6034", "apple,arm-platform", NULL };
 static const char *const j516s[] = { "apple,j516s", "apple,t6030", "apple,arm-platform", NULL };
 static const char *const j613[] = { "apple,j613", "apple,t8122", "apple,arm-platform", NULL };
+static const char *const j504[] = { "apple,j504", "apple,t8122", "apple,arm-platform", NULL };
+static const char *const j433[] = { "apple,j433", "apple,t8122", "apple,arm-platform", NULL };
 
 static void v14_board_j516c(struct kunit *test)
 {
@@ -252,7 +254,46 @@ static void v14_swap_timestamps_encoding(struct kunit *test)
 	}
 }
 
+/*
+ * J504 (14" M3 MacBook Pro): the J613 image on the T8122 DCP, its own 3024x1964
+ * ProMotion panel, the qualified level block (brightness) and unstamped swaps. The other T8122
+ * Macs (J433, J434) have no record.
+ */
+static void v14_board_j504(struct kunit *test)
+{
+	const struct dcp_v14_board *b, *air;
+	bool known;
+
+	b = board_for("apple,t8122-dcp", j504, &known);
+	KUNIT_ASSERT_NOT_NULL(test, b);
+	air = board_for("apple,t8122-dcp", j613, &known);
+	KUNIT_ASSERT_NOT_NULL(test, air);
+	KUNIT_EXPECT_PTR_NE(test, b, air);
+	KUNIT_EXPECT_STREQ(test, b->name, "J504");
+	KUNIT_EXPECT_STREQ(test, b->machine, "apple,j504");
+	KUNIT_EXPECT_STREQ(test, b->handoff, "apple,t8122-handoff");
+	KUNIT_EXPECT_STREQ(test, b->firmware_uuid, J613_DCP_IMAGE);
+	KUNIT_EXPECT_EQ(test, b->panel_width, 3024);
+	KUNIT_EXPECT_EQ(test, b->panel_height, 1964);
+	KUNIT_EXPECT_TRUE(test, b->promotion);
+	KUNIT_EXPECT_TRUE(test, b->log_bringup);
+	KUNIT_EXPECT_TRUE(test, b->panel_nits);
+	KUNIT_EXPECT_FALSE(test, b->base_edid);
+	KUNIT_EXPECT_EQ(test, b->ctm_set, air->ctm_set);
+	KUNIT_EXPECT_EQ(test, b->ctm_get, air->ctm_get);
+	KUNIT_EXPECT_TRUE(test, dcp_v14_board_admits(b, J613_DCP_IMAGE));
+	KUNIT_EXPECT_FALSE(test, dcp_v14_board_admits(b, T6030_DCP_IMAGE));
+	KUNIT_EXPECT_FALSE(test, dcp_v14_board_admits(b, J516C_DCP_IMAGE));
+	KUNIT_EXPECT_FALSE(test, dcp_v14_board_stamps_swaps(b, false));
+
+	KUNIT_EXPECT_NULL(test, board_for("apple,t8122-dcp", j433, &known));
+	KUNIT_EXPECT_TRUE(test, known);
+	/* A J504 root with another SoC's DCP gets no J504 record. */
+	KUNIT_EXPECT_NULL(test, board_for("apple,t6031-dcp", j504, &known));
+}
+
 static struct kunit_case v14_board_cases[] = {
+	KUNIT_CASE(v14_board_j504),
 	KUNIT_CASE(v14_board_j516c),
 	KUNIT_CASE(v14_board_j514c),
 	KUNIT_CASE(v14_board_t6031_other_boards),
diff --git a/drivers/gpu/drm/asahi/m3/m3_params.rs b/drivers/gpu/drm/asahi/m3/m3_params.rs
index 8167c6c3ec05c4..b6dbb6726a004f 100644
--- a/drivers/gpu/drm/asahi/m3/m3_params.rs
+++ b/drivers/gpu/drm/asahi/m3/m3_params.rs
@@ -589,9 +589,9 @@ pub(crate) fn thermal_hot_param() -> (u64, bool) {
 
 /// Whether to start the runtime backend on a T8122 (`asahi.m3_backend`), and say why not.
 ///
-/// The runtime starts only on the boards the T8122 table allows (the M3 MacBook Airs), with
-/// `auto` and `runtime` alike: it has not run on any T8122, so nothing forces it onto another
-/// board. The G15 manager backend is T6030-only.
+/// The runtime starts only on the boards the T8122 table allows (the M3 MacBook Airs and the
+/// 14" M3 MacBook Pro, `t8122_admission::T8122_BOARDS`), with `auto` and `runtime` alike:
+/// nothing forces it onto another board. The G15 manager backend is T6030-only.
 pub(crate) fn t8122_backend(pdev: &platform::Device<Core<'_>>) -> bool {
     let dev = pdev.as_ref();
     match M3_BACKEND.load(Ordering::Relaxed) {
@@ -610,7 +610,7 @@ pub(crate) fn t8122_backend(pdev: &platform::Device<Core<'_>>) -> bool {
         _ => {
             dev_info!(
                 dev,
-                "M3: no GPU backend on this T8122 board: the runtime backend may start only on the M3 MacBook Airs (J613, J615)\n"
+                "M3: no GPU backend on this T8122 board: the runtime backend may start only on the M3 MacBook Airs (J613, J615) and the 14\" M3 MacBook Pro (J504)\n"
             );
             false
         }
diff --git a/drivers/gpu/drm/asahi/m3/m3_soc.rs b/drivers/gpu/drm/asahi/m3/m3_soc.rs
index 4b81475612b6fa..6a1f08fd852530 100644
--- a/drivers/gpu/drm/asahi/m3/m3_soc.rs
+++ b/drivers/gpu/drm/asahi/m3/m3_soc.rs
@@ -284,9 +284,10 @@ pub(crate) static T8122: Soc = Soc {
     gpu_revision_id: hw::GpuRevisionID::C0,
     board: "apple,t8122",
     gpu: "apple,agx-t8122",
-    // The M3 MacBook Airs (13" J613, 15" J615). Allowed, not validated: the runtime has not run
-    // on either, and starts only behind a boot loader that hands the GPU over.
-    validated_boards: &[b"apple,j613", b"apple,j615"],
+    // The M3 MacBook Airs (13" J613, 15" J615) and the 14" M3 MacBook Pro (J504), which loads
+    // the same G15G image (`t8122_admission::T8122_BOARDS`). The runtime starts only behind a
+    // boot loader that hands the GPU over.
+    validated_boards: &crate::m3::t8122_admission::T8122_BOARDS,
     clusters: 1,
     cores_per_cluster: 10,
     mailbox_compatibles: &[
diff --git a/drivers/gpu/drm/asahi/m3/m3_thermal_policy.rs b/drivers/gpu/drm/asahi/m3/m3_thermal_policy.rs
index 11901c94056256..f7aa8120b25aaf 100644
--- a/drivers/gpu/drm/asahi/m3/m3_thermal_policy.rs
+++ b/drivers/gpu/drm/asahi/m3/m3_thermal_policy.rs
@@ -269,6 +269,7 @@ mod zone_tests {
         }
         assert_eq!(required_zones(b"apple,j613\0"), 1);
         assert_eq!(required_zones(b"apple,j615\0"), 1);
+        assert_eq!(required_zones(b"apple,j504\0apple,t8122\0"), 1);
     }
 
     #[test]
diff --git a/drivers/gpu/drm/asahi/m3/t8122_admission.rs b/drivers/gpu/drm/asahi/m3/t8122_admission.rs
index 7505065810acc3..f4c4658bc5d0b9 100644
--- a/drivers/gpu/drm/asahi/m3/t8122_admission.rs
+++ b/drivers/gpu/drm/asahi/m3/t8122_admission.rs
@@ -2,6 +2,12 @@
 
 //! Read-only T8122 identity admission. Firmware startup remains disabled.
 
+/// The T8122 boards the M3 runtime starts on by default: the M3 MacBook Airs (13" J613, 15" J615)
+/// and the 14" M3 MacBook Pro (J504). All three load the same 14.8.3 G15G image (UUID
+/// `DF697F05-…`, checked separately by firmware admission). The other T8122 Macs (the J433 and
+/// J434 iMacs) are not listed.
+pub(crate) const T8122_BOARDS: [&[u8]; 3] = [b"apple,j613", b"apple,j615", b"apple,j504"];
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub(crate) struct Identity {
     pub(crate) active_cores: u32,
@@ -151,6 +157,17 @@ pub(crate) fn read_identity(
 
 #[cfg(test)]
 mod tests {
+    use super::T8122_BOARDS;
+
+    #[test]
+    fn the_t8122_runtime_boards_are_exactly_the_airs_and_the_14_inch_pro() {
+        // Exact: dropping the J504 or adding another T8122 Mac (J433, J434) must fail here.
+        assert_eq!(T8122_BOARDS, [&b"apple,j613"[..], b"apple,j615", b"apple,j504"]);
+        for other in [&b"apple,j433"[..], b"apple,j434", b"apple,t8122"] {
+            assert!(!T8122_BOARDS.contains(&other));
+        }
+    }
+
     use super::*;
 
     const G15G_C0: u32 = 0x0702_2000;
diff --git a/drivers/gpu/drm/asahi/m3/t8122_start.rs b/drivers/gpu/drm/asahi/m3/t8122_start.rs
index 737034dd6f8c13..f4fe2bae341aa5 100644
--- a/drivers/gpu/drm/asahi/m3/t8122_start.rs
+++ b/drivers/gpu/drm/asahi/m3/t8122_start.rs
@@ -301,8 +301,8 @@ pub(crate) fn arm(dev: &device::Device, soc: &Soc) -> Result<Option<Experiment>>
         e.mapping_count(),
         storage::IOMAP_BASE
     );
-    // J613/J615 have no SoC die temperature zone yet, so a cap above the no-feedback limit runs
-    // the fanless GPU without any temperature feedback (`m3_thermal` holds the cap but gets no
+    // J615 and J504 have no SoC die temperature zone yet, so a cap above the no-feedback limit
+    // runs the GPU without any temperature feedback (`m3_thermal` holds the cap but gets no
     // reading). The runtime cap and the firmware ceiling stay equal, because the cap is at most
     // the no-feedback limit.
     if v.pstate_cap > knobs::PSTATE_CAP {
diff --git a/tools/asahi/dcp14-panel-tests.py b/tools/asahi/dcp14-panel-tests.py
index 0abcd1e89d3f93..19c02cafd82010 100755
--- a/tools/asahi/dcp14-panel-tests.py
+++ b/tools/asahi/dcp14-panel-tests.py
@@ -87,7 +87,25 @@
      machine="apple,j613";const struct dcp_v14_board*j=iomfb_v14_7_board(&dev);
      assert(!IS_ERR(j)&&j->panel_width==2560 && j->panel_height==1664);
      machine="apple,j700";assert(IS_ERR(iomfb_v14_7_board(&dev)));
-     machine="apple,j504";assert(IS_ERR(iomfb_v14_7_board(&dev)));
+     /* J504 (14" M3 MacBook Pro): the J613 image, the J514 panel, 60 or 120 Hz. */
+     machine="apple,j504";const struct dcp_v14_board*p14=iomfb_v14_7_board(&dev);
+     assert(!IS_ERR(p14)&&p14&&!strcmp(p14->name,"J504")&&!strcmp(p14->debugfs,"dcp-j504"));
+     assert(p14->panel_width==3024&&p14->panel_height==1964&&p14->promotion&&p14->log_bringup);
+     assert(!strcmp(p14->firmware_uuid,"90F849E1-B422-367E-B389-50246F8DEC47"));
+     assert(!strcmp(p14->handoff,"apple,t8122-handoff")&&p14->panel_nits&&!p14->swap_timestamps);
+     assert(p14->ctm_set==A(421)&&p14->ctm_get==A(420));
+     image_uuid=p14->firmware_uuid;assert(probe_gate(&dev,p14)==0);
+     image_uuid="C042E95C-B9D8-3F0E-94B3-582A08AA6FDD";assert(probe_gate(&dev,p14)==-ENODEV);
+     image_uuid="F493F03E-CC40-3D89-9A08-5F259BA2B246";assert(probe_gate(&dev,p14)==-ENODEV);
+     image_uuid=NULL;assert(probe_gate(&dev,p14)==-ENODEV);
+     image_uuid=p14->firmware_uuid;marker_value=0;assert(probe_gate(&dev,p14)==-ENODEV);marker_value=1;
+     {struct apple_dcp_v14 q={.dev=&dev,.board=p14};width=3024;height=1890;stride=width*4;notch=74;
+      assert(dcp_v14_geometry(&q)==0&&q.panel_height==1964&&q.notch_rows==74);
+      height=1964;notch=0;assert(dcp_v14_geometry(&q)==0&&q.panel_height==1964);
+      width=2560;height=1600;stride=width*4;notch=64;assert(dcp_v14_geometry(&q)==-EINVAL);}
+     /* Other T8122 Macs (J433/J434 iMacs) have no record. */
+     machine="apple,j433";assert(IS_ERR(iomfb_v14_7_board(&dev)));
+     machine="apple,j434";assert(IS_ERR(iomfb_v14_7_board(&dev)));
      dcp.compatible="apple,t6030-dcp";machine="apple,j516s";assert(iomfb_v14_7_board(&dev)==&dcp_v14_board_t6030);
      dcp.compatible="apple,t8122-dcp";
      struct apple_dcp_v14 v={.dev=&dev,.board=b};width=2880;height=1800;stride=width*4;notch=64;
@@ -139,7 +157,7 @@
      machine="apple,j613";assert(IS_ERR(iomfb_v14_7_board(&dev)));
      machine="apple,j516m";assert(IS_ERR(iomfb_v14_7_board(&dev)));
      dcp.compatible="apple,t6030-dcp";machine="apple,j516s";assert(iomfb_v14_7_board(&dev)==&dcp_v14_board_t6030);
-     puts("current J615/J613/T6030/J516C/J514C admission + hidden/full notch, wrong geometry controls: PASS");
+     puts("current J615/J613/J504/T6030/J516C/J514C admission + hidden/full notch, wrong geometry controls: PASS");
     #endif
     }
     '''