linux-kernel - [PATCH v3 08/14] Soundwire: generic_bandwidth

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Message-ID: <20241218080155.102405-9-yung-chuan.liao@linux.intel.com>
Date: Wed, 18 Dec 2024 16:01:49 +0800
From: Bard Liao <yung-chuan.liao@...ux.intel.com>
To: linux-sound@...r.kernel.org,
	vkoul@...nel.org
Cc: vinod.koul@...aro.org,
	linux-kernel@...r.kernel.org,
	pierre-louis.bossart@...ux.dev,
	bard.liao@...el.com
Subject: [PATCH v3 08/14] Soundwire: generic_bandwidth_allocation: set frame shape on fly

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 <yung-chuan.liao@...ux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
---
 .../soundwire/generic_bandwidth_allocation.c  | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

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",
-- 
2.43.0