drivers: cache: ncore: Disable snoop filter

There is hardware bug in NCORE CCU IP and it is causing an issue in the
coherent directory tracking of outstanding cache lines.
The workaround is disabling snoop filter.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam@intel.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@intel.com>

diff --git a/drivers/cache/cache-ncore.c b/drivers/cache/cache-ncore.c
index 3beff78..117d2b9 100644 (file)
--- a/drivers/cache/cache-ncore.c
+++ b/drivers/cache/cache-ncore.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2019 Intel Corporation <www.intel.com>
+ * Copyright (C) 2019-2022 Intel Corporation <www.intel.com>
  *
  */
 #include <dm.h>
@@ -81,8 +81,8 @@ static void ncore_ccu_init_dirs(void __iomem *base)
                                hang();
                        }
 
-                       /* Enable snoop filter, a bit per snoop filter */
-                       setbits_le32((ulong)CCU_DIR_REG_ADDR(base, DIRUSFER, i),
+                       /* Disable snoop filter, a bit per snoop filter */
+                       clrbits_le32((ulong)CCU_DIR_REG_ADDR(base, DIRUSFER, i),
                                     BIT(f));
                }
        }