[S] Change in coreboot[main]: ec/google/chromeec: Do not fill TypeC ACPI device when UCSI is enabled

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/81967?usp=email )

Change subject: ec/google/chromeec: Do not fill TypeC ACPI device when UCSI is enabled
......................................................................

ec/google/chromeec: Do not fill TypeC ACPI device when UCSI is enabled

Do not fill the ACPI table entry associated with the cros_ec_typec
driver once we switch to the UCSI kernel driver. Skip the ACPI entry if
EC implements the UCSI_PPM feature, and the CBI flag to enable UCSI is
set.

BUG=b:333078787
TEST=emerge-brox coreboot chromeos-bootimage

Cq-Depend: chromium:5416841
Change-Id: I67dff6445aa7ba3ba48a04d1df3541f880d09d0a
Signed-off-by: Pavan Holla 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81967
Tested-by: build bot (Jenkins) 
Reviewed-by: Caveh Jalali 
Reviewed-by: Paul Menzel 
---
M src/ec/google/chromeec/ec.c
M src/ec/google/chromeec/ec.h
M src/ec/google/chromeec/ec_acpi.c
3 files changed, 37 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Paul Menzel: Looks good to me, but someone else must approve
  Caveh Jalali: Looks good to me, approved

diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c
index 8fdfbfb..a32b2a5 100644
--- a/src/ec/google/chromeec/ec.c
+++ b/src/ec/google/chromeec/ec.c
@@ -723,6 +723,31 @@
    return cbi_get_uint32(ssfc, CBI_TAG_SSFC);
 }

+bool google_chromeec_get_ucsi_enabled(void)
+{
+	int rv;
+	union ec_common_control cc;
+
+	rv = google_chromeec_check_feature(EC_FEATURE_UCSI_PPM);
+	if (rv < 0) {
+		printk(BIOS_INFO, "Cannot check if EC_FEATURE_UCSI_PPM is available: status = %d\n", rv);
+		return false;
+	}
+
+	if (rv == 0)
+		return false;
+
+	/* Check if PPM is enabled at runtime. */
+	cc.ucsi_enabled = 0;
+	rv = cbi_get_uint32(&cc.raw_value, CBI_TAG_COMMON_CONTROL);
+	if (rv < 0) {
+		printk(BIOS_DEBUG, "Cannot get tag CBI_TAG_COMMON_CONTROL from CBI: status = %d\n", rv);
+		return false;
+	}
+
+	return (cc.ucsi_enabled != 0);
+}
+
 static int cbi_get_string(char *buf, size_t bufsize, uint32_t tag)
 {
    struct ec_params_get_cbi params = {
diff --git a/src/ec/google/chromeec/ec.h b/src/ec/google/chromeec/ec.h
index 0e1df9c..0062df6 100644
--- a/src/ec/google/chromeec/ec.h
+++ b/src/ec/google/chromeec/ec.h
@@ -424,6 +424,13 @@
  */
 bool google_chromeec_is_battery_present_and_above_critical_threshold(void);

+/**
+ * Determine if the UCSI stack is currently active.
+ *
+ * @return true if EC implements the UCSI stack
+ */
+bool google_chromeec_get_ucsi_enabled(void);
+
 #if CONFIG(HAVE_ACPI_TABLES)
 /**
  * Writes USB Type-C PD related information to the SSDT
diff --git a/src/ec/google/chromeec/ec_acpi.c b/src/ec/google/chromeec/ec_acpi.c
index cf29636..e24f8ac 100644
--- a/src/ec/google/chromeec/ec_acpi.c
+++ b/src/ec/google/chromeec/ec_acpi.c
@@ -157,6 +157,11 @@
    struct acpi_pld pld = {0};
    uint32_t pcap_mask = 0;

+	/* UCSI implementations do not require an ACPI device with mux info since the
+	   linux kernel doesn't set the muxes. */
+	if (google_chromeec_get_ucsi_enabled())
+		return;
+
    rv = google_chromeec_get_num_pd_ports(&num_ports);
    if (rv || num_ports == 0)
    	return;