[alsa-devel] [PATCHv3 03/20] OMAP: McBSP: Use appropriate value for startup delay

[Eduardo Valentin]

Signed-off-by: Eduardo Valentin <eduardo.valentin at nokia.com>
---
 arch/arm/plat-omap/mcbsp.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 84cc323..2383b08 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -359,7 +359,13 @@ void omap_mcbsp_start(unsigned int id)
 	w = OMAP_MCBSP_READ(io_base, SPCR1);
 	OMAP_MCBSP_WRITE(io_base, SPCR1, w | 1);
 
-	udelay(100);
+	/*
+	 * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
+	 * REVISIT: 100us may give enough time for two CLKSRG, however
+	 * due to some unknown PM related, clock gating etc. reason it
+	 * is now at 500us.
+	 */
+	udelay(500);
 
 	/* Start frame sync */
 	w = OMAP_MCBSP_READ(io_base, SPCR2);
-- 
1.6.2.GIT

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