asc: Do not clear ASC run bit while running

Some ASCs will get stuck if we do that. Instead, explicitly clear it
after an RTKit shutdown.

Signed-off-by: Hector Martin <[email protected]>

Author: marcan

src/asc.c

@@ -69,7 +69,10 @@ int asc_get_iop_node(asc_dev_t *asc)
 void asc_cpu_start(asc_dev_t *asc)
 {
     set32(asc->cpu_base + ASC_CPU_CONTROL, ASC_CPU_CONTROL_START);
-    udelay(10);
+}
+
+void asc_cpu_stop(asc_dev_t *asc)
+{
     clear32(asc->cpu_base + ASC_CPU_CONTROL, ASC_CPU_CONTROL_START);
 }
 

src/asc.h

@@ -18,6 +18,7 @@ void asc_free(asc_dev_t *asc);
 int asc_get_iop_node(asc_dev_t *asc);
 
 void asc_cpu_start(asc_dev_t *asc);
+void asc_cpu_stop(asc_dev_t *asc);
 
 bool asc_can_recv(asc_dev_t *asc);
 bool asc_can_send(asc_dev_t *asc);

src/rtkit.c

@@ -700,5 +700,10 @@ bool rtkit_quiesce(rtkit_dev_t *rtk)
 
 bool rtkit_sleep(rtkit_dev_t *rtk)
 {
-    return rtkit_switch_power_state(rtk, RTKIT_POWER_SLEEP);
+    int ret = rtkit_switch_power_state(rtk, RTKIT_POWER_SLEEP);
+    if (ret < 0)
+        return ret;
+
+    asc_cpu_stop(rtk->asc);
+    return 0;
 }