[PATCH 5/7] crypto: stm32/hash: Wait for idle before final CPU xmit

[Linus Walleij]

When calculating the hash using the CPU, right before the final
hash calculation, heavy testing on Ux500 reveals that it is wise
to wait for the hardware to go idle before calculating the
final hash.

The default test vectors mostlt worked fine, but when I used the
extensive tests and stress the hardware I ran into this problem.

Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
 drivers/crypto/stm32/stm32-hash.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index 5f03be121787..92b2d55d6e93 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -362,6 +362,9 @@ static int stm32_hash_xmit_cpu(struct stm32_hash_dev *hdev,
 		stm32_hash_write(hdev, HASH_DIN, buffer[count]);
 
 	if (final) {
+		if (stm32_hash_wait_busy(hdev))
+			return -ETIMEDOUT;
+
 		stm32_hash_set_nblw(hdev, length);
 		reg = stm32_hash_read(hdev, HASH_STR);
 		reg |= HASH_STR_DCAL;

-- 
2.38.1