From: ext Lopez Cruz, Misael x0052729@ti.com
This patch explicitly initializes McBSP Transmit Configuration Control Register (XCCR) and Receive Configuration Control Register (RCCR) to their reset values. Reset values are 26 ns of DX delay and Transmit DMA disabled for XCCR register; receive full cycle mode enabled and Receive DMA disabled for RCCR register.
This patch requires a counterpart in OMAP McBSP driver before to apply it. The required changes in McBSP were sent and approved in linux-omap mailing list and patch is going upstream (commit 3127f8f8595a064b3f1a1837fea2177902589ac3 from linux-omap-2.6 tree).
Signed-off-by: Misael Lopez Cruz x0052729@ti.com [ jarkko.nikula@nokia.com: Commit id for counterpart patch corrected ] Signed-off-by: Jarkko Nikula jarkko.nikula@nokia.com --- sound/soc/omap/omap-mcbsp.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index ec5e18a..05dd5ab 100644 --- a/sound/soc/omap/omap-mcbsp.c +++ b/sound/soc/omap/omap-mcbsp.c @@ -302,6 +302,10 @@ static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai, regs->spcr1 |= RINTM(3); regs->rcr2 |= RFIG; regs->xcr2 |= XFIG; + if (cpu_is_omap2430() || cpu_is_omap34xx()) { + regs->xccr = DXENDLY(1) | XDMAEN; + regs->rccr = RFULL_CYCLE | RDMAEN; + }
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: