Commit 085f4ace authored by Pierre-Louis Bossart's avatar Pierre-Louis Bossart Committed by Vinod Koul
Browse files

soundwire: intel: read mclk_freq property from firmware 



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

Signed-off-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190806005522.22642-12-pierre-louis.bossart@linux.intel.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 82fc8d06

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;

}