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ec/google/chromeec: don't put empty block in SSDT 

Check that there are actually USB-PD ports for which to
add data to SSDT, before actually generating SSDT data.
This prevents an empty scope from being generated on
devices without any USB-PD ports, which was breaking
parsing/decompilation on some older platforms (eg,
Braswell).

Test: build/boot google/edgar, verify SSDT table able to
be parsed via iasl after dumping.

Change-Id: Ia213e5815e9160e9b36b2501eeccb6385abef47e
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39665
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Matt DeVillier 2020-03-18 23:45:32 -05:00 committed by Patrick Georgi
parent 78b43c8990
commit 70ea3b9141
1 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/ec/google/chromeec/ec_acpi.c
View File

@ -177,19 +177,14 @@ static void add_usb_port_references(struct acpi_dp *dsd, int port_number)
}
}
static void fill_ssdt_typec_device(struct device *dev)
static void fill_ssdt_typec_device(int num_ports)
{
struct usb_pd_port_caps port_caps;
char con_name[] = "CONx";
struct acpi_dp *dsd;
int num_ports;
int rv;
int i;
rv = google_chromeec_get_num_pd_ports(&num_ports);
if (rv)
return;
acpigen_write_device(GOOGLE_CHROMEEC_USBC_DEVICE_NAME);
acpigen_write_name_string("_HID", GOOGLE_CHROMEEC_USBC_DEVICE_HID);
acpigen_write_name_string("_DDN", "ChromeOS EC Embedded Controller "
@ -220,8 +215,12 @@ static void fill_ssdt_typec_device(struct device *dev)
void google_chromeec_fill_ssdt_generator(struct device *dev)
{
int num_ports;
if (google_chromeec_get_num_pd_ports(&num_ports))
return;
/* Reference the existing device's scope */
acpigen_write_scope(acpi_device_path(dev));
fill_ssdt_typec_device(dev);
fill_ssdt_typec_device(num_ports);
acpigen_pop_len(); /* Scope */
}