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bcm/emmc: remove unused cardr wakeup(), use MACHP(0) as tick reference

--- a/sys/src/9/bcm/emmc.c

+++ b/sys/src/9/bcm/emmc.c

@@ -166,7 +166,6 @@

 struct Ctlr {

 	Rendez	r;

-	Rendez	cardr;

 	int	fastclock;

 	ulong	extclk;

 	int	appcmd;

@@ -346,9 +345,9 @@

 		WR(Interrupt, i);

 	}

 	WR(Cmdtm, c);

-	now = m->ticks;

+	now = MACHP(0)->ticks;

 	while(((i=r[Interrupt])&(Cmddone|Err)) == 0)

-		if(m->ticks-now > HZ)

+		if(MACHP(0)->ticks - now > HZ)

 			break;

 	if((i&(Cmddone|Err)) != Cmddone){

 		if((i&~(Err|Cardintr)) != Ctoerr)

@@ -495,8 +494,6 @@

 	i = r[Interrupt];

 	if(i&(Datadone|Err))

 		wakeup(&emmc.r);

-	if(i&Cardintr)

-		wakeup(&emmc.cardr);

 	WR(Irpten, r[Irpten] & ~i);

 }