diff options
| author | Eduardo Valentin <eduardo.valentin@nokia.com> | 2009-08-20 13:18:09 (GMT) |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2009-08-20 19:10:25 (GMT) |
| commit | 44a6311c0a83f682bcf18fae389a1b270df29314 (patch) | |
| tree | 870d1eec47f03360c66be122c0d292aa1cbee6b8 /arch | |
| parent | 946a49a95dabc9dd10344ae9ab4db9f14c5ad502 (diff) | |
| download | linux-44a6311c0a83f682bcf18fae389a1b270df29314.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | 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 0aa2524..e9dd703 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 */ |