diff options
| author | Patrick Rudolph <siro@das-labor.org> | 2017-05-22 18:30:27 +0200 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2017-06-02 18:51:13 +0200 |
| commit | a6909f88e95e1ba48e84207f146c9f9a01c7dd32 (patch) | |
| tree | b684bf36432bd064ef3d412617d2c5004da497bb | |
| parent | 7971582ec49574e42c5fa5d75e6bdba8a0b9b1f8 (diff) | |
device/device_util: Add function to determine bridge state
Add a method to get the state of a bridge device.
Return true if at least one enabled device on the secondary
bus is found.
Useful to disable non hotplugable bridges without any devices attached.
Change-Id: Ic8fe539d233031d4d177b03dd2c03edb5ab8c88d
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/19817
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
| -rw-r--r-- | src/device/device_util.c | 25 | ||||
| -rw-r--r-- | src/include/device/device.h | 1 |
2 files changed, 26 insertions, 0 deletions
diff --git a/src/device/device_util.c b/src/device/device_util.c index e31ade56c0..859de319fa 100644 --- a/src/device/device_util.c +++ b/src/device/device_util.c @@ -775,6 +775,31 @@ void disable_children(struct bus *bus) } } +/* + * Returns true if the device is an enabled bridge that has at least + * one enabled device on its secondary bus. + */ +bool dev_is_active_bridge(device_t dev) +{ + struct bus *link; + device_t child; + + if (!dev || !dev->enabled) + return 0; + + if (!dev->link_list || !dev->link_list->children) + return 0; + + for (link = dev->link_list; link; link = link->next) { + for (child = link->children; child; child = child->sibling) { + if (child->enabled) + return 1; + } + } + + return 0; +} + static void resource_tree(struct device *root, int debug_level, int depth) { int i = 0; diff --git a/src/include/device/device.h b/src/include/device/device.h index 7b4fce36ea..5bc4d1c2f9 100644 --- a/src/include/device/device.h +++ b/src/include/device/device.h @@ -190,6 +190,7 @@ u32 dev_path_encode(device_t dev); const char *bus_path(struct bus *bus); void dev_set_enabled(device_t dev, int enable); void disable_children(struct bus *bus); +bool dev_is_active_bridge(device_t dev); /* Option ROM helper functions */ void run_bios(struct device *dev, unsigned long addr); |