TCPMv2: Allocate FRS ports 3.0 A when needed

When there are no PD sinks requiring 3.0 A, any FRS ports which require
that much current will have FRS detection enabled.  If a PD sink
requiring 3.0 A is attached, then FRS detection will be disabled on that
port again.

FRS port partners which require only USB or 1.5 A of current will always
have FRS detection enabled.

BRANCH=None
BUG=b:141690755
TEST=on volteer-based system, verify:
- FRS source partners requiring 1.5 A or less always have FRS detection
enabled
- FRS detection is disabled on detach
- FRS source partner requiring 3.0 A has FRS detection enabled if no PD
sink needing 3.0 A is present
- Plugging in a 3.0 A PD sink disables FRS detection for the 3.0 A FRS
partner
- Unplugging a 3.0 A PD sink enables FRS detection for the 3.0 A FRS
partner
- When FRS occurs on 3.0 A port with detection enabled, partner is
offered appropriate starting current in first source caps

Signed-off-by: Diana Z <dzigterman@chromium.org>
Change-Id: Ib067ac7c1c2f4a6e64f36aeffd1b8dde5cb93760
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2676084
Reviewed-by: Keith Short <keithshort@chromium.org>
Reviewed-by: Eric Herrmann <eherrmann@chromium.org>
Tested-by: Eric Herrmann <eherrmann@chromium.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/test/fake_usbc.c b/test/fake_usbc.c
index cdbd41d03d..9eb913ea19 100644
--- a/test/fake_usbc.c
+++ b/test/fake_usbc.c
@@ -283,6 +283,10 @@ void dpm_remove_sink(int port)
 {
 }
 
+void dpm_remove_source(int port)
+{
+}
+
 int dpm_get_source_pdo(const uint32_t **src_pdo, const int port)
 {
 	*src_pdo = pd_src_pdo;