soundwire: intel: read mclk_freq property from firmware (085f4ace) · Commits · 戴 / test

The BIOS provides an Intel-specific property, let's use it to avoid hard-coded clock dividers. Signed-off-by:

drivers/soundwire/intel.c

+26 −0

Original line number	Diff line number	Diff line
		@@ -808,11 +808,37 @@ static int intel_register_dai(struct sdw_intel *sdw)
		dais, num_dai);
		}

		static int sdw_master_read_intel_prop(struct sdw_bus *bus)
		{
		struct sdw_master_prop *prop = &bus->prop;
		struct fwnode_handle *link;
		char name[32];
		int nval, i;

		/* Find master handle */
		snprintf(name, sizeof(name),
		"mipi-sdw-link-%d-subproperties", bus->link_id);

		link = device_get_named_child_node(bus->dev, name);
		if (!link) {
		dev_err(bus->dev, "Master node %s not found\n", name);
		return -EIO;
		}

		fwnode_property_read_u32(link,
		"intel-sdw-ip-clock",
		&prop->mclk_freq);
		return 0;
		}

		static int intel_prop_read(struct sdw_bus *bus)
		{
		/* Initialize with default handler to read all DisCo properties */
		sdw_master_read_prop(bus);

		/* read Intel-specific properties */
		sdw_master_read_intel_prop(bus);

		return 0;
		}