gpu: nvgpu: Disable illegal comptag interrupt

Illegal comptag interrupt is triggered when a page is mapped with
two different kinds with incompatible compression status. This can
be intentional, so disable the interrupt.

Change-Id: I84a212beac147991d09d2d381a9e770b1364f4d8
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1029663
(cherry picked from commit 819607a768f9fccdd0b233d58bcf88b9eee4ee19)
Reviewed-on: http://git-master/r/1031010
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/ltc_gk20a.c b/drivers/gpu/nvgpu/gk20a/ltc_gk20a.c
index c6ff07da..0d9a98b4 100644
--- a/drivers/gpu/nvgpu/gk20a/ltc_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/ltc_gk20a.c
@@ -1,9 +1,7 @@
 /*
- * drivers/video/tegra/host/gk20a/ltc_gk20a.c
+ * GK20A L2
  *
- * GK20A Graphics
- *
- * Copyright (c) 2011-2015, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2016, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -173,9 +171,17 @@ out:
 
 static void gk20a_ltc_init_fs_state(struct gk20a *g)
 {
+        u32 reg;
+
         gk20a_dbg_info("initialize gk20a L2");
 
         g->max_ltc_count = g->ltc_count = 1;
+
+        /* Disable LTC interrupts */
+        reg = gk20a_readl(g, ltc_ltcs_ltss_intr_r());
+        reg &= ~ltc_ltcs_ltss_intr_en_evicted_cb_m();
+        reg &= ~ltc_ltcs_ltss_intr_en_illegal_compstat_m();
+        gk20a_writel(g, ltc_ltcs_ltss_intr_r(), reg);
 }
 
 static void gk20a_ltc_isr(struct gk20a *g)