ARM: OMAP: DSP: Fix shared memory synchronization

This fix assures DMA domain is kept awake till ARM completes
its access to DSP internal memories.
Signed-off-by: Tetsuo Yamabe <tetsuo.yamabe@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>

arch/arm/plat-omap/dsp/dsp.h

@@ -170,7 +170,7 @@ extern void dsp_dbg_stop(void);
 
 extern int ipbuf_is_held(unsigned char tid, unsigned short bid);
 
-extern void dsp_mem_sync_inc(void);
+extern int dsp_mem_sync_inc(void);
 extern int dsp_mem_sync_config(struct mem_sync_struct *sync);
 extern enum dsp_mem_type_e dsp_mem_type(void *vadr, size_t len);
 extern int dsp_address_validate(void *p, size_t len, char *fmt, ...);

arch/arm/plat-omap/dsp/dsp_mem.c

@@ -155,17 +155,18 @@ static __inline__ unsigned long lineup_offset(unsigned long adr,
 	return newadr;
 }
 
-void dsp_mem_sync_inc(void)
+int dsp_mem_sync_inc(void)
 {
-	/*
-	 * FIXME: dsp_mem_enable()!!!
-	 */
+	if (dsp_mem_enable((void *)dspmem_base) < 0)
+		return -1;
 	if (mem_sync.DARAM)
 		mem_sync.DARAM->ad_arm++;
 	if (mem_sync.SARAM)
 		mem_sync.SARAM->ad_arm++;
 	if (mem_sync.SDRAM)
 		mem_sync.SDRAM->ad_arm++;
+	dsp_mem_disable((void *)dspmem_base);
+	return 0;
 }
 
 /*

arch/arm/plat-omap/dsp/task.c

@@ -1914,7 +1914,11 @@ int dsp_tadd(unsigned char minor, unsigned long adr)
 	arg.argc = 2;
 	arg.argv = argv;
 
-	dsp_mem_sync_inc();
+	if (dsp_mem_sync_inc() < 0) {
+		printk(KERN_ERR "omapdsp: memory sync failed!\n");
+		ret = -EBUSY;
+		goto fail_out;
+	}
 	dsp_mbcmd_send_and_wait_exarg(&mb, &arg, &cfg_wait_q);
 
 	tid = cfg_tid;