crypto: ccree - check that cryptocell reset completed

In case of driver probe and pm resume we need to check that the cryptocell
hardware reset cycle is completed. during the reset cycle that Cryptocell
provide read only access to the APB interface which allows to verify
through the CC registers that the reset is completed. Until reset
completion we assume that any write/crypto operation is blocked.

Signed-off-by: Ofir Drang <ofir.drang@arm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccree/cc_pm.c

@@ -49,6 +49,11 @@ int cc_pm_resume(struct device *dev)
 		dev_err(dev, "failed getting clock back on. We're toast.\n");
 		return rc;
 	}
+	/* wait for Crytpcell reset completion */
+	if (!cc_wait_for_reset_completion(drvdata)) {
+		dev_err(dev, "Cryptocell reset not completed");
+		return -EBUSY;
+	}
 
 	cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
 	rc = init_cc_regs(drvdata, false);