Hi, On Tue, 21 Aug 2012 16:42:19 +0300 Peter Ujfalusi <peter.ujfalusi@xxxxxx> wrote: > On 08/21/2012 08:42 AM, Andreas Kemnade wrote: > > Hi, > > > > I tried a couple of times with different kernels to use mcbsp1 of dm3730 > > in master mode (so that it sends out clocks). > > The result always is that I can send data out. but arecord gets no input. It > > waits for input but does not get anything, although clocks are generated, > > checked that with a scope. > > > > I even took a driver which works in master mode on another mcbsp and just changed > > the mcbsp number. > > What needs to be done to receive data from mcbsp1? > > You should check the PIN mux configuration of McBSP1 FSR/CLKR pins. McBSP1 on > dm3730 have 6 pin configuration. I think the capture should work fine if you > select the FSX as FSR source, and CLKX as CLKR source. > if I understand the TRM correctly, according to Figure 21-26 in chapter 21.4.2.3. if GSYNC is set, the receiver uses the signal from the sample rate generator, so CLKX does not need to be the CLKR source. But I tried also with the DEVCONF0 MCBSP1_CLKR bit as you proposed. I tried snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_CLKR_SRC_CLKX, 0, SND_SOC_CLOCK_OUT); snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_FSR_SRC_FSX, 0, SND_SOC_CLOCK_OUT); That is why I send you my patch about that mux settings. But I had no success. The CLKX as CLKR source and FSX as FSR source setting I have only seen when mcbsp1 is used in slave mode. If you know any working code which uses mcbsp1 in master mode then let me know. Greetings Andreas Kemnade
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