[sival] Add option to skip reset on lc state read.

Add `opentitantool` argument to skip reset on `LcStateRead`. This is
useful when debugging device alerts  as the device will report
escalation state as a result of an escalation. Since the escalation
status is not persisted across resets, we need to be able to connect to
LC_TAP to read without performing a reset. This is only possible in lc
states that support continuous PINMUX_TAP polling.

Signed-off-by: Miguel Osorio <[email protected]>

sw/host/opentitantool/src/command/lc.rs

@@ -79,6 +79,12 @@ pub struct LcStateRead {
 
     #[command(flatten)]
     pub jtag_params: JtagParams,
+
+    // Skip device reset before connecting to LC controller. This is only
+    // applicable for lifecycle states that support PINMUX_TAP continuous
+    // sampling.
+    #[arg(short, long, action = clap::ArgAction::Set, default_value = "false")]
+    pub skip_reset: bool,
 }
 
 impl CommandDispatch for LcStateRead {
@@ -89,7 +95,13 @@ impl CommandDispatch for LcStateRead {
     ) -> Result<Option<Box<dyn Annotate>>> {
         // Set the TAP straps for the lifecycle controller and reset.
         transport.pin_strapping("PINMUX_TAP_LC")?.apply()?;
-        transport.reset_target(self.reset_delay, true)?;
+
+        if !self.skip_reset {
+            transport.reset_target(self.reset_delay, true)?;
+        } else {
+            // Unconditionally wait for the device to switch tap.
+            std::thread::sleep(Duration::from_millis(10));
+        }
 
         // Spawn an OpenOCD process and connect to the LC JTAG TAP.
         let mut jtag = self