bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0178-drm-v3d-Suppress-all-but-the-first-MMU-error.patch b/target/linux/bcm27xx/patches-5.15/950-0178-drm-v3d-Suppress-all-but-the-first-MMU-error.patch
new file mode 100644
index 0000000000..c50260bc26
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0178-drm-v3d-Suppress-all-but-the-first-MMU-error.patch
@@ -0,0 +1,39 @@
+From ab12e353a3c4ecc58aac15a8ee5e98b12537d0a8 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Mon, 11 Nov 2019 20:18:08 +0000
+Subject: [PATCH] drm/v3d: Suppress all but the first MMU error
+
+The v3d driver currently encounters a lot of MMU PTE exceptions, so
+only log the first to avoid swamping the kernel log.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/gpu/drm/v3d/v3d_irq.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/drivers/gpu/drm/v3d/v3d_irq.c
++++ b/drivers/gpu/drm/v3d/v3d_irq.c
+@@ -177,6 +177,7 @@ v3d_hub_irq(int irq, void *arg)
+ 			"GMP",
+ 		};
+ 		const char *client = "?";
++		static int logged_error;
+ 
+ 		V3D_WRITE(V3D_MMU_CTL, V3D_READ(V3D_MMU_CTL));
+ 
+@@ -186,6 +187,7 @@ v3d_hub_irq(int irq, void *arg)
+ 				client = v3d41_axi_ids[axi_id];
+ 		}
+ 
++		if (!logged_error)
+ 		dev_err(v3d->drm.dev, "MMU error from client %s (%d) at 0x%llx%s%s%s\n",
+ 			client, axi_id, (long long)vio_addr,
+ 			((intsts & V3D_HUB_INT_MMU_WRV) ?
+@@ -194,6 +196,7 @@ v3d_hub_irq(int irq, void *arg)
+ 			 ", pte invalid" : ""),
+ 			((intsts & V3D_HUB_INT_MMU_CAP) ?
+ 			 ", cap exceeded" : ""));
++		logged_error = 1;
+ 		status = IRQ_HANDLED;
+ 	}
+