From 7f6ae79280eabce22f1df3c858617c6e890e3594 Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Thu, 20 May 2021 22:47:02 -0700 Subject: device: Consider fw_config probing in `is_dev_enabled()` With the introduction of fw_config support in coreboot, it is possible for mainboards to control the state of a device (on/off) in ramstage using fw_config probe conditions. However, the device tree in immutable in all other stages and hence `is_dev_enabled()` does not really reflect the true state as in ramstage. This change adds a call to `fw_config_probe_dev()` in `is_dev_enabled()` when device tree is immutable (by checking DEVTREE_EARLY) to first check if device is disabled because of device probe conditions. If so, then it reports device as being disabled. Else, dev->enabled is used to report the device state. This allows early stages (bootblock, romstage) to use `is_dev_enabled()` to get the true state of the device by taking probe conditions into account and eliminates the need for each caller to perform their own separate probing. Change-Id: Ifede6775bda245cba199d3419aebd782dc690f2c Signed-off-by: Furquan Shaikh Reviewed-on: https://review.coreboot.org/c/coreboot/+/54752 Reviewed-by: Tim Wawrzynczak Reviewed-by: Karthik Ramasubramanian Reviewed-by: EricR Lai Tested-by: build bot (Jenkins) --- src/device/device_const.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'src/device') diff --git a/src/device/device_const.c b/src/device/device_const.c index 2ce76c61e5..20afe7e445 100644 --- a/src/device/device_const.c +++ b/src/device/device_const.c @@ -7,6 +7,7 @@ #include #include #include +#include /** Linked list of ALL devices */ DEVTREE_CONST struct device *DEVTREE_CONST all_devices = &dev_root; @@ -383,3 +384,16 @@ DEVTREE_CONST struct device *dev_bus_each_child(const struct bus *parent, return dev; } + +bool is_dev_enabled(const struct device *dev) +{ + if (!dev) + return false; + + /* For stages with immutable device tree, first check if device is disabled because of + fw_config probing. In these stages, dev->enabled does not reflect the true state of a + device that uses fw_config probing. */ + if (DEVTREE_EARLY && !fw_config_probe_dev(dev, NULL)) + return false; + return dev->enabled; +} -- cgit v1.2.3