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authorEduardo Valentin <eduardo.valentin@nokia.com>2009-08-20 16:18:09 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-08-20 20:10:25 +0100
commit44a6311c0a83f682bcf18fae389a1b270df29314 (patch)
tree870d1eec47f03360c66be122c0d292aa1cbee6b8
parent946a49a95dabc9dd10344ae9ab4db9f14c5ad502 (diff)
downloadlinux-linaro-precise-44a6311c0a83f682bcf18fae389a1b270df29314.tar.gz
OMAP: McBSP: Use appropriate value for startup delay
Increasing startup delay value as worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec Although, 100us may give enough time for two CLKSRG, due to some unknown PM related, clock gating etc. reason, this patch increases it to 500us. Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r--arch/arm/plat-omap/mcbsp.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 0aa2524186f..e9dd70320f7 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -365,7 +365,13 @@ void omap_mcbsp_start(unsigned int id, int tx, int rx)
w = OMAP_MCBSP_READ(io_base, SPCR1);
OMAP_MCBSP_WRITE(io_base, SPCR1, w | (rx & 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);
if (idle) {
/* Start frame sync */