soundwire: qcom: cleanup internal port config indexing

Internally used portconfig array for storing port bandwidth
params starts from offset zero. However port zero is not really
used and we also copy the bus parameters to offset zero.
So basically we endup with a code which has to subtract 1 from port
number to get to port parameters.

This is bit confusing to the reader so, make this bit more obvious by only
copying the parameters to offset 1 instead of zero. This will avoid doing
-1 every time when we try to get port params.

Similar thing has been recently done with din/dout_port_mask.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210401092454.21299-1-srinivas.kandagatla@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/qcom.c

@@ -724,7 +724,7 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
 	int reg = SWRM_DP_PORT_CTRL_BANK((params->port_num), bank);
 	int ret;
 
-	pcfg = &ctrl->pconfig[params->port_num - 1];
+	pcfg = &ctrl->pconfig[params->port_num];
 
 	value = pcfg->off1 << SWRM_DP_PORT_CTRL_OFFSET1_SHFT;
 	value |= pcfg->off2 << SWRM_DP_PORT_CTRL_OFFSET2_SHFT;
@@ -801,11 +801,11 @@ static int qcom_swrm_compute_params(struct sdw_bus *bus)
 	struct qcom_swrm_port_config *pcfg;
 	struct sdw_slave *slave;
 	unsigned int m_port;
-	int i = 0;
+	int i = 1;
 
 	list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
 		list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
-			pcfg = &ctrl->pconfig[p_rt->num - 1];
+			pcfg = &ctrl->pconfig[p_rt->num];
 			p_rt->transport_params.port_num = p_rt->num;
 			if (pcfg->word_length != SWR_INVALID_PARAM) {
 				sdw_fill_port_params(&p_rt->port_params,
@@ -822,7 +822,7 @@ static int qcom_swrm_compute_params(struct sdw_bus *bus)
 				m_port = slave->m_port_map[p_rt->num];
 				/* port config starts at offset 0 so -1 from actual port number */
 				if (m_port)
-					pcfg = &ctrl->pconfig[m_port - 1];
+					pcfg = &ctrl->pconfig[m_port];
 				else
 					pcfg = &ctrl->pconfig[i];
 				p_rt->transport_params.port_num = p_rt->num;
@@ -1159,15 +1159,16 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
 	of_property_read_u8_array(np, "qcom,ports-lane-control", lane_control, nports);
 
 	for (i = 0; i < nports; i++) {
-		ctrl->pconfig[i].si = si[i];
-		ctrl->pconfig[i].off1 = off1[i];
-		ctrl->pconfig[i].off2 = off2[i];
-		ctrl->pconfig[i].bp_mode = bp_mode[i];
-		ctrl->pconfig[i].hstart = hstart[i];
-		ctrl->pconfig[i].hstop = hstop[i];
-		ctrl->pconfig[i].word_length = word_length[i];
-		ctrl->pconfig[i].blk_group_count = blk_group_count[i];
-		ctrl->pconfig[i].lane_control = lane_control[i];
+		/* Valid port number range is from 1-14 */
+		ctrl->pconfig[i + 1].si = si[i];
+		ctrl->pconfig[i + 1].off1 = off1[i];
+		ctrl->pconfig[i + 1].off2 = off2[i];
+		ctrl->pconfig[i + 1].bp_mode = bp_mode[i];
+		ctrl->pconfig[i + 1].hstart = hstart[i];
+		ctrl->pconfig[i + 1].hstop = hstop[i];
+		ctrl->pconfig[i + 1].word_length = word_length[i];
+		ctrl->pconfig[i + 1].blk_group_count = blk_group_count[i];
+		ctrl->pconfig[i + 1].lane_control = lane_control[i];
 	}
 
 	return 0;