[PATCH v2 1/2] driver core: fw_devlink: Allow firmware to mark devices as best effort

Saravana Kannan
2022-06-23T08:08:26Z

When firmware sets the FWNODE_FLAG_BEST_EFFORT flag for a fwnode,
fw_devlink will do a best effort ordering for that device where it'll
only enforce the probe/suspend/resume ordering of that device with
suppliers that have drivers. The driver of that device can then decide
if it wants to defer probe or probe without the suppliers.

This will be useful for avoid probe delays of the console device that
were caused by commit 71066545b48e ("driver core: Set
fw_devlink.strict=1 by default").

Fixes: 71066545b48e ("driver core: Set fw_devlink.strict=1 by default")
Reported-by: Sascha Hauer <sha@pengutronix.de>
Reported-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Tested-by: Peng Fan <peng.fan@nxp.com>
---
drivers/base/core.c | 3 ++-
include/linux/fwnode.h | 4 ++++
2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 839f64485a55..ccdd5b4295de 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -968,7 +968,8 @@ static void device_links_missing_supplier(struct device *dev)

static bool dev_is_best_effort(struct device *dev)
{
- return fw_devlink_best_effort && dev->can_match;
+ return (fw_devlink_best_effort && dev->can_match) ||
+ (dev->fwnode && (dev->fwnode->flags & FWNODE_FLAG_BEST_EFFORT));
}

/**
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 9a81c4410b9f..89b9bdfca925 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -27,11 +27,15 @@ struct device;
* driver needs its child devices to be bound with
* their respective drivers as soon as they are
* added.
+ * BEST_EFFORT: The fwnode/device needs to probe early and might be missing some
+ * suppliers. Only enforce ordering with suppliers that have
+ * drivers.
*/
#define FWNODE_FLAG_LINKS_ADDED BIT(0)
#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_BEST_EFFORT BIT(4)

struct fwnode_handle {
struct fwnode_handle *secondary;
--
2.37.0.rc0.161.g10f37bed90-goog