On 8/15/22 12:37, Greg KH wrote:
On Mon, Aug 15, 2022 at 10:08:07AM +0600, Khalid Masum wrote:
On 8/14/22 15:45, Greg KH wrote:
On Sun, Aug 14, 2022 at 02:04:15PM +0600, Khalid Masum wrote:
According to the TODO, In sw_bus_master_add, bus->multi_link is to be
populated with properties from FW node props. Make this happen by
creating a new fwnode_handle flag FWNODE_FLAG_MULTI_LINKED and use
the flag to store the multi_link value from intel_link_startup. Use
this flag to initialize bus->multi_link.
Signed-off-by: Khalid Masum <khalid.masum.92@xxxxxxxxx>
---
I do not think adding a new flag for fwnode_handle is a good idea.
So, what would be the best way to initialize bus->multilink with
fwnode props?
-- Khalid Masum
drivers/soundwire/bus.c | 4 ++--
drivers/soundwire/intel.c | 1 +
include/linux/fwnode.h | 1 +
3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index a2bfb0434a67..80df1672c60b 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -74,9 +74,9 @@ int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
/*
* Initialize multi_link flag
- * TODO: populate this flag by reading property from FW node
*/
- bus->multi_link = false;
+ bus->multi_link = (fwnode->flags & FWNODE_FLAG_MULTI_LINKED)
+ == FWNODE_FLAG_MULTI_LINKED;
I missed that this was an if statement here, please write this to be
more obvious and readable.
if (bus->ops->read_prop) {
ret = bus->ops->read_prop(bus);
if (ret < 0) {
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 505c5ef061e3..034d1c523ddf 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1347,6 +1347,7 @@ int intel_link_startup(struct auxiliary_device *auxdev)
*/
bus->multi_link = true;
bus->hw_sync_min_links = 1;
+ dev->fwnode->flags |= FWNODE_FLAG_MULTI_LINKED;
}
/* Initialize shim, controller */
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 9a81c4410b9f..446a52744953 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -32,6 +32,7 @@ struct device;
#define FWNODE_FLAG_NOT_DEVICE BIT(1)
#define FWNODE_FLAG_INITIALIZED BIT(2)
#define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD BIT(3)
+#define FWNODE_FLAG_MULTI_LINKED BIT(4)
What does this commit actually change?
The new flag will lets us save if the device has multilink in fwnode_handle
whenever needed.
Then for soundwire/intel, save the multi_link flag into fwnode during
startup.
Later at master_add, as written in todo, initialize the multilink flag with
fwnode's flag property.
And what does that allow to happen? What changes with all of this?
As suggested by Pierre-Louis Bossart these changes are not necessary and
the TODO is to be removed. Earlier my intention was to create a new flag
that lets us know whether multi_link is to be read from
sdw_bus_master_add just as instructed in TODO.
I shall send another patch, that removes the TODO, as suggested by
Pierre-Louis Bossart.
thanks,
greg k-h
thanks,
-- Khalid Masum
