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soundwire: intel: read mclk_freq property from firmware
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The BIOS provides an Intel-specific property, let's use it to avoid
hard-coded clock dividers.

Signed-off-by: Pierre-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: Vinod Koul <vkoul@kernel.org>
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Pierre-Louis Bossart authored and Vinod Koul committed Aug 21, 2019
1 parent 82fc8d0 commit 085f4ac
Showing 1 changed file with 26 additions and 0 deletions.
26 changes: 26 additions & 0 deletions drivers/soundwire/intel.c
Original file line number Diff line number Diff line change
Expand Up @@ -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;
}

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