[PATCH v2 1/3] ARM: optee-early: drop superfluous sync_caches_for_execution

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

We expect start_optee_early() to be called with caches disabled, so there
is no point in calling sync_caches_for_execution inside.

Therefore let's verify the assumption that caches are indeed disabled
and drop the useless call.

Co-authored-by: Fabian Pflug <f.pflug@pengutronix.de>
Signed-off-by: Fabian Pflug <f.pflug@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - panic instead of retuning error code (Rouven)
---
 arch/arm/lib32/optee-early.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/lib32/optee-early.c b/arch/arm/lib32/optee-early.c
index 735d829c99fb..c9959b5e41b8 100644
--- a/arch/arm/lib32/optee-early.c
+++ b/arch/arm/lib32/optee-early.c
@@ -7,7 +7,9 @@
  */
 #include <asm/cache.h>
 #include <asm/setjmp.h>
+#include <asm/system.h>
 #include <tee/optee.h>
+#include <linux/bug.h>
 #include <debug_ll.h>
 #include <string.h>
 
@@ -19,6 +21,9 @@ int start_optee_early(void *fdt, void *tee)
 	struct optee_header *hdr;
 	int ret;
 
+	/* We expect this function to be called with data caches disabled */
+	BUG_ON(get_cr() & CR_C);
+
 	hdr = tee;
 	ret = optee_verify_header(hdr);
 	if (ret < 0)
@@ -30,7 +35,6 @@ int start_optee_early(void *fdt, void *tee)
 	/* We use setjmp/longjmp here because OP-TEE clobbers most registers */
 	ret = setjmp(tee_buf);
 	if (ret == 0) {
-		sync_caches_for_execution();
 		tee_start(0, 0, fdt);
 		longjmp(tee_buf, 1);
 	}
-- 
2.39.5