[v3,08/14] Soundwire: generic_bandwidth_allocation: set frame shape on fly

Commit Message

Bard Liao Dec. 18, 2024, 8:01 a.m. UTC

We need to recalculate frame shape when sdw bus clock is changed.
And need to make sure all Peripherals connected to the Manager support
dynamic clock change.

Signed-off-by: Bard Liao <[e-mail]>
Reviewed-by: Ranjani Sridharan <[e-mail]>
---
 .../soundwire/generic_bandwidth_allocation.c  | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

Patch

diff --git a/drivers/soundwire/generic_bandwidth_allocation.c b/drivers/soundwire/generic_bandwidth_allocation.c
index 2950a3d002ce..d847413141d3 100644
--- a/drivers/soundwire/generic_bandwidth_allocation.c
+++ b/drivers/soundwire/generic_bandwidth_allocation.c
@@ -327,6 +327,19 @@  static int sdw_select_row_col(struct sdw_bus *bus, int clk_freq)
 	return -EINVAL;
 }
 
+static bool is_clock_scaling_supported(struct sdw_bus *bus)
+{
+	struct sdw_master_runtime *m_rt;
+	struct sdw_slave_runtime *s_rt;
+
+	list_for_each_entry(m_rt, &bus->m_rt_list, bus_node)
+		list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node)
+			if (!is_clock_scaling_supported_by_slave(s_rt->slave))
+				return false;
+
+	return true;
+}
+
 /**
  * sdw_compute_bus_params: Compute bus parameters
  *
@@ -352,6 +365,10 @@  static int sdw_compute_bus_params(struct sdw_bus *bus)
 		clk_buf = NULL;
 	}
 
+	/* If dynamic scaling is not supported, don't try higher freq */
+	if (!is_clock_scaling_supported(bus))
+		clk_values = 1;
+
 	for (i = 0; i < clk_values; i++) {
 		if (!clk_buf)
 			curr_dr_freq = bus->params.max_dr_freq;
@@ -378,6 +395,12 @@  static int sdw_compute_bus_params(struct sdw_bus *bus)
 		return -EINVAL;
 	}
 
+	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;
+
 	ret = sdw_select_row_col(bus, curr_dr_freq);
 	if (ret < 0) {
 		dev_err(bus->dev, "%s: could not find frame configuration for bus dr_freq %d\n",