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OMAP: McBSP: Do not enable SRG in slave mode

Message ID 1283242304-27738-1-git-send-email-peter.ujfalusi@nokia.com (mailing list archive)
State Accepted
Commit d0db27786b9fabeac6cb330ccf127451c249af73
Delegated to: Tony Lindgren
Headers show

Commit Message

Peter Ujfalusi Aug. 31, 2010, 8:11 a.m. UTC 
None
diff mbox

Patch

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index e31496e..ecbfe39 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -878,7 +878,7 @@  EXPORT_SYMBOL(omap_mcbsp_free);
 void omap_mcbsp_start(unsigned int id, int tx, int rx)
 {
 	struct omap_mcbsp *mcbsp;
-	int idle;
+	int enable_srg = 0;
 	u16 w;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
@@ -893,10 +893,13 @@  void omap_mcbsp_start(unsigned int id, int tx, int rx)
 	mcbsp->rx_word_length = (MCBSP_READ_CACHE(mcbsp, RCR1) >> 5) & 0x7;
 	mcbsp->tx_word_length = (MCBSP_READ_CACHE(mcbsp, XCR1) >> 5) & 0x7;
 
-	idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
-			MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
+	/* Only enable SRG, if McBSP is master */
+	w = MCBSP_READ_CACHE(mcbsp, PCR0);
+	if (w & (FSXM | FSRM | CLKXM | CLKRM))
+		enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
+				MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 
-	if (idle) {
+	if (enable_srg) {
 		/* Start the sample generator */
 		w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 		MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
@@ -919,7 +922,7 @@  void omap_mcbsp_start(unsigned int id, int tx, int rx)
 	 */
 	udelay(500);
 
-	if (idle) {
+	if (enable_srg) {
 		/* Start frame sync */
 		w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 		MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));