[PATCH v2 05/10] arm: socfpga: iossm: refactor io96b_mb_init

[Michael Tretter <m.tretter@pengutronix.de>]

Keep the returned number of interfaces in a local variable and store it
only after checking the type of the memory.

This brings the behavior closer to the behavior of the iossm v1 API and
simplifies the addition of the iossm v1 implementation.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
Changes in v2:

- none
---
 arch/arm/mach-socfpga/iossm_mailbox.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-socfpga/iossm_mailbox.c b/arch/arm/mach-socfpga/iossm_mailbox.c
index 042ea4a99e5c..53c8687f4db8 100644
--- a/arch/arm/mach-socfpga/iossm_mailbox.c
+++ b/arch/arm/mach-socfpga/iossm_mailbox.c
@@ -204,26 +204,27 @@ void io96b_mb_init(struct io96b_info *io96b_ctrl)
 
 	pr_debug("%s: num_instance %d\n", __func__, io96b_ctrl->num_instance);
 	for (i = 0; i < io96b_ctrl->num_instance; i++) {
+		int num_mem_interface = 0;
+		u32 mem_intf_info[2];
+
 		mb_ctrl = &io96b_ctrl->io96b[i].mb_ctrl;
 		pr_debug("%s: get memory interface IO96B %d\n", __func__, i);
 		/* Get memory interface IP type and instance ID (IP identifier) */
 		io96b_mb_req_no_param(io96b_ctrl->io96b[i].io96b_csr_addr, 0, 0,
 				      CMD_GET_SYS_INFO, GET_MEM_INTF_INFO, &usr_resp);
-		pr_debug("%s: get response from memory interface IO96B %d\n", __func__, i);
-		/* Retrieve number of memory interface(s) */
-		mb_ctrl->num_mem_interface =
+		num_mem_interface =
 			IOSSM_CMD_RESPONSE_DATA_SHORT(usr_resp.cmd_resp_status) & 0x3;
-		pr_debug("%s: IO96B %d: num_mem_interface: %d\n", __func__,
-			 i, mb_ctrl->num_mem_interface);
+		for (j = 0; j < num_mem_interface; j++)
+			mem_intf_info[j] = usr_resp.cmd_resp_data[j];
 
 		/* Retrieve memory interface IP type and instance ID (IP identifier) */
 		j = 0;
-		for (k = 0; k < mb_ctrl->num_mem_interface; k++) {
-			ip_type_ret = FIELD_GET(INTF_IP_TYPE_MASK, usr_resp.cmd_resp_data[k]);
-			instance_id_ret = FIELD_GET(INTF_INSTANCE_ID_MASK,
-						    usr_resp.cmd_resp_data[k]);
+		for (k = 0; k < num_mem_interface; k++) {
+			ip_type_ret = FIELD_GET(INTF_IP_TYPE_MASK, mem_intf_info[k]);
+			instance_id_ret = FIELD_GET(INTF_INSTANCE_ID_MASK, mem_intf_info[k]);
 
 			if (ip_type_ret) {
+				mb_ctrl->num_mem_interface++;
 				mb_ctrl->ip_type[j] = ip_type_ret;
 				mb_ctrl->ip_instance_id[j] = instance_id_ret;
 				pr_debug("%s: IO96B %d mem_interface %d: ip_type_ret: 0x%x\n",

-- 
2.47.3