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imx8/sai: flush the ring on close to avoid garbage leftovers on restarts

--- a/sys/src/9/imx8/sai.c

+++ b/sys/src/9/imx8/sai.c

@@ -156,6 +156,15 @@

 }

 static void

+setempty(Ctlr *ctlr)

+{

+	ilock(ctlr);

+	ctlr->w.ri = 0;

+	ctlr->w.wi = 0;

+	iunlock(ctlr);

+}

+

+static void

 saistop(Ctlr *ctlr)

 {

 	if(!ctlr->wactive)

@@ -164,6 +173,13 @@

 	wr(TCSR, TCSR_FR | TCSR_SR);

 }

+static int

+inactive(void *arg)

+{

+	Ctlr *ctlr = arg;

+	return !ctlr->wactive;

+}

+

 static long

 saiwrite(Audio *adev, void *a, long n, vlong)

 {

@@ -193,8 +209,10 @@

 {

 	Ctlr *ctlr = adev->ctlr;

-	if(mode == OWRITE || mode == ORDWR)

-		saistop(ctlr);

+	if(mode == OWRITE || mode == ORDWR){

+		sleep(&ctlr->w.r, inactive, ctlr);

+		setempty(ctlr);

+	}

 }

 static void