firmware: qcom_scm-64: Improve SMC convention detection

void __qcom_scm_init(void)

{

	u64 cmd;

	struct arm_smccc_res res;

	u32 fnid = SCM_SMC_FNID(QCOM_SCM_SVC_INFO, QCOM_SCM_INFO_IS_CALL_AVAIL);

	/* First try a SMC64 call */

	cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64,

				 ARM_SMCCC_OWNER_SIP, fnid);

	arm_smccc_smc(cmd, QCOM_SCM_ARGS(1), cmd & (~BIT(ARM_SMCCC_TYPE_SHIFT)),

		      0, 0, 0, 0, 0, &res);

	struct qcom_scm_desc desc = {

		.svc = QCOM_SCM_SVC_INFO,

		.cmd = QCOM_SCM_INFO_IS_CALL_AVAIL,

		.args[0] = SCM_SMC_FNID(QCOM_SCM_SVC_INFO,

					QCOM_SCM_INFO_IS_CALL_AVAIL) |

			   (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT),

		.arginfo = QCOM_SCM_ARGS(1),

		.owner = ARM_SMCCC_OWNER_SIP,

	};

	struct qcom_scm_res res;

	int ret;

	if (!res.a0 && res.a1)

	qcom_smccc_convention = ARM_SMCCC_SMC_64;

	else

	// Device isn't required as there is only one argument - no device

	// needed to dma_map_single to secure world

	ret = qcom_scm_call_atomic(NULL, &desc, &res);

	if (!ret && res.result[0] == 1)

		goto out;

	qcom_smccc_convention = ARM_SMCCC_SMC_32;

	ret = qcom_scm_call_atomic(NULL, &desc, &res);

	if (!ret && res.result[0] == 1)

		goto out;

	qcom_smccc_convention = -1;

	BUG();

out:

	pr_info("QCOM SCM SMC Convention: %lld\n", qcom_smccc_convention);

}

bool __qcom_scm_pas_supported(struct device *dev, u32 peripheral)