target/linux/bcm27xx/patches-5.4/950-0334-drm-v3d-Suppress-all-but-the-first-MMU-error.patch

   1 From f1f228c84864bad0bb07de1c72ceafaec035ac15 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 11 Nov 2019 20:18:08 +0000
   4 Subject: [PATCH] drm/v3d: Suppress all but the first MMU error
   5
   6 The v3d driver currently encounters a lot of MMU PTE exceptions, so
   7 only log the first to avoid swamping the kernel log.
   8
   9 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  10 ---
  11  drivers/gpu/drm/v3d/v3d_irq.c | 3 +++
  12  1 file changed, 3 insertions(+)
  13
  14 --- a/drivers/gpu/drm/v3d/v3d_irq.c
  15 +++ b/drivers/gpu/drm/v3d/v3d_irq.c
  16 @@ -177,6 +177,7 @@ v3d_hub_irq(int irq, void *arg)
  17                         "GMP",
  18                 };
  19                 const char *client = "?";
  20 +               static int logged_error;
  21
  22                 V3D_WRITE(V3D_MMU_CTL, V3D_READ(V3D_MMU_CTL));
  23
  24 @@ -186,6 +187,7 @@ v3d_hub_irq(int irq, void *arg)
  25                                 client = v3d41_axi_ids[axi_id];
  26                 }
  27
  28 +               if (!logged_error)
  29                 dev_err(v3d->dev, "MMU error from client %s (%d) at 0x%llx%s%s%s\n",
  30                         client, axi_id, (long long)vio_addr,
  31                         ((intsts & V3D_HUB_INT_MMU_WRV) ?
  32 @@ -194,6 +196,7 @@ v3d_hub_irq(int irq, void *arg)
  33                          ", pte invalid" : ""),
  34                         ((intsts & V3D_HUB_INT_MMU_CAP) ?
  35                          ", cap exceeded" : ""));
  36 +               logged_error = 1;
  37                 status = IRQ_HANDLED;
  38         }
  39