soundwire: generic_bandwidth_allocation: check bandwidth with real

colume

The existing code assumes the column number will not change, but it
could change if curr_dr_freq changes. Calculate the new column number
before checking the bandwidth to make the checking be more accurate.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

Author: bardliao

drivers/soundwire/generic_bandwidth_allocation.c

@@ -590,16 +590,23 @@ static int sdw_compute_bus_params(struct sdw_bus *bus)
 	if (!is_clock_scaling_supported(bus))
 		clk_values = 1;
 
+	if (!mstr_prop->default_frame_rate || !mstr_prop->default_row)
+		return -EINVAL;
+
 	for (i = 0; i < clk_values; i++) {
+		int total_col;
+
 		if (!clk_buf)
 			curr_dr_freq = bus->params.max_dr_freq;
 		else
 			curr_dr_freq = (is_gear) ?
 				(bus->params.max_dr_freq >>  clk_buf[i]) :
 				clk_buf[i] * SDW_DOUBLE_RATE_FACTOR;
 
-		if (curr_dr_freq * (mstr_prop->default_col - 1) >=
-		    bus->params.bandwidth * mstr_prop->default_col)
+		total_col = curr_dr_freq / mstr_prop->default_frame_rate / mstr_prop->default_row;
+
+		if (curr_dr_freq * (total_col - 1) >=
+		    bus->params.bandwidth * total_col)
 			break;
 
 		list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
@@ -661,9 +668,6 @@ static int sdw_compute_bus_params(struct sdw_bus *bus)
 		}
 	}
 
-	if (!mstr_prop->default_frame_rate || !mstr_prop->default_row)
-		return -EINVAL;
-
 	mstr_prop->default_col = curr_dr_freq / mstr_prop->default_frame_rate /
 				 mstr_prop->default_row;