Blackfin arch: fix bug - detect 0.1 silicon revision BF527-EZKIT as 0.0 version

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 20 insertions, 1 deletions

diff --git a/include/asm-blackfin/processor.h b/include/asm-blackfin/processor.h
index 1c0040724612..6f3995b119d8 100644
--- a/include/asm-blackfin/processor.h
+++ b/include/asm-blackfin/processor.h
@@ -112,7 +112,26 @@ unsigned long get_wchan(struct task_struct *p);
 static inline uint32_t __pure bfin_revid(void)
 {
         /* stored in the upper 4 bits */
-        return bfin_read_CHIPID() >> 28;
+        uint32_t revid = bfin_read_CHIPID() >> 28;
+
+#ifdef CONFIG_BF52x
+        /* ANOMALY_05000357
+         * Incorrect Revision Number in DSPID Register
+         */
+        if (revid == 0)
+                switch (bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI)) {
+                case 0x0010:
+                        revid = 0;
+                        break;
+                case 0x2796:
+                        revid = 1;
+                        break;
+                default:
+                        revid = 0xFFFF;
+                        break;
+                }
+#endif
+        return revid;
 }
 
 static inline uint32_t __pure bfin_compiled_revid(void)