Patrick Georgi submitted this change.
driver/usb/acpi: Add power resources for devices on USB ports
Allow a USB device to define PowerResource in its SSDT AML code.
PowerResouce ACPI generation expects SoC to define the callbacks for
generating AML code for GPIO manipulation.
Device requiring PowerResource needs to define following parameters:
* Reset GPIO - Optional, GPIO to put device into reset or take it out
of reset.
* Reset delay - Delay after reset GPIO is asserted (default 0).
* Reset off delay - Delay after reset GPIO is de-asserted (default 0).
* Enable GPIO - Optional, GPIO to enable device.
* Enable delay - Delay after enable GPIO is asserted (default 0).
* Enable off delay - Delay after enable GPIO is de-asserted (default 0).
BUG=b:163100335
TEST=Ensure that the Power Resource ACPI object is added under the
concerned USB device.
Change-Id: Icc1aebfb9e3e646a7f608f0cd391079fd30dd1c0
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46713
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Peichao Wang <pwang12@lenovo.corp-partner.google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
M src/drivers/usb/acpi/chip.h
M src/drivers/usb/acpi/usb_acpi.c
2 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/src/drivers/usb/acpi/chip.h b/src/drivers/usb/acpi/chip.h
index 8cd9268..8afdf6f 100644
--- a/src/drivers/usb/acpi/chip.h
+++ b/src/drivers/usb/acpi/chip.h
@@ -44,7 +44,21 @@
bool use_custom_pld;
struct acpi_pld custom_pld;
+ /* Does the device have a power resource? */
+ bool has_power_resource;
+
+ /* GPIO used to take device out of reset or to put it into reset. */
struct acpi_gpio reset_gpio;
+ /* Delay to be inserted after device is taken out of reset. */
+ unsigned int reset_delay_ms;
+ /* Delay to be inserted after device is put into reset. */
+ unsigned int reset_off_delay_ms;
+ /* GPIO used to enable device. */
+ struct acpi_gpio enable_gpio;
+ /* Delay to be inserted after device is enabled. */
+ unsigned int enable_delay_ms;
+ /* Delay to be inserted after device is disabled. */
+ unsigned int enable_off_delay_ms;
};
#endif /* __USB_ACPI_CHIP_H__ */
diff --git a/src/drivers/usb/acpi/usb_acpi.c b/src/drivers/usb/acpi/usb_acpi.c
index 55ef1d3..8a597e3 100644
--- a/src/drivers/usb/acpi/usb_acpi.c
+++ b/src/drivers/usb/acpi/usb_acpi.c
@@ -11,9 +11,10 @@
static bool usb_acpi_add_gpios_to_crs(struct drivers_usb_acpi_config *cfg)
{
/*
- * Return false if reset GPIO is not provided.
+ * Return false if reset GPIO is not provided or is provided as part of power
+ * resource.
*/
- if (cfg->reset_gpio.pin_count == 0)
+ if (cfg->has_power_resource || cfg->reset_gpio.pin_count == 0)
return false;
return true;
@@ -61,6 +62,21 @@
acpi_dp_write(dsd);
}
+ if (config->has_power_resource) {
+ const struct acpi_power_res_params power_res_params = {
+ &config->reset_gpio,
+ config->reset_delay_ms,
+ config->reset_off_delay_ms,
+ &config->enable_gpio,
+ config->enable_delay_ms,
+ config->enable_off_delay_ms,
+ NULL,
+ 0,
+ 0
+ };
+ acpi_device_add_power_res(&power_res_params);
+ }
+
acpigen_pop_len();
printk(BIOS_INFO, "%s: %s at %s\n", path,
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