fix(ast10x0-i2c): handle buffer-mode rx and smbus probe

Fix AST1060 I2C slave-mode status handling that could hang the bus.

- Handle buffer-mode RX_DONE (no WAIT_RX_DMA): report DataReceived.
- Handle bare SLAVE_MATCH (SMBus quick probe): re-arm and clear
  status so the slave does not clock-stretch until SMBus timeout.

Signed-off-by: PojuiLiu <pojui_liu@jabil.com>

target/ast10x0/peripherals/i2c/slave.rs

diff --git a/target/ast10x0/peripherals/i2c/slave.rs b/target/ast10x0/peripherals/i2c/slave.rs
index 8b118e8..801049e 100644
--- a/target/ast10x0/peripherals/i2c/slave.rs
+++ b/target/ast10x0/peripherals/i2c/slave.rs
@@ -498,12 +498,7 @@
                     .write(|w| w.bits(constants::AST_I2CS_PKT_DONE));
             }
             let sts = status & (!(constants::AST_I2CS_PKT_DONE | constants::AST_I2CS_PKT_ERROR));
-            if sts == constants::AST_I2CS_SLAVE_MATCH
-                || sts == constants::AST_I2CS_SLAVE_MATCH | constants::AST_I2CS_RX_DONE
-            {
-                // S: Sw
-                return Some(SlaveEvent::WriteRequest);
-            } else if sts == constants::AST_I2CS_SLAVE_MATCH | constants::AST_I2CS_WAIT_RX_DMA
+            if sts == constants::AST_I2CS_SLAVE_MATCH | constants::AST_I2CS_WAIT_RX_DMA
                 || sts
                     == constants::AST_I2CS_SLAVE_MATCH
                         | constants::AST_I2CS_RX_DONE
@@ -517,6 +512,24 @@
                 return Some(SlaveEvent::DataReceived {
                     len: self.slave_rx_len(),
                 });
+            } else if sts == constants::AST_I2CS_SLAVE_MATCH | constants::AST_I2CS_RX_DONE {
+                // S: Sw|D (buffer mode — no WAIT_RX_DMA bit)
+                self.arm_slave_receive(&mut cmd);
+                unsafe {
+                    self.regs().i2cs28().write(|w| w.bits(cmd));
+                }
+                return Some(SlaveEvent::DataReceived {
+                    len: self.slave_rx_len(),
+                });
+            } else if sts == constants::AST_I2CS_SLAVE_MATCH {
+                // S: Sw — address match only (e.g. SMBus quick probe); re-arm and
+                // clear status so the bus does not clock-stretch until timeout.
+                self.arm_slave_receive(&mut cmd);
+                unsafe {
+                    self.regs().i2cs28().write(|w| w.bits(cmd));
+                    self.regs().i2cs24().write(|w| w.bits(sts));
+                }
+                return Some(SlaveEvent::WriteRequest);
             } else if sts == constants::AST_I2CS_SLAVE_MATCH | constants::AST_I2CS_STOP {
                 // S: Sw|P
                 self.arm_slave_receive(&mut cmd);