On 10/28/2015 02:59 PM, Caleb Crome wrote: > On Wed, Oct 28, 2015 at 1:11 AM, Roberto Fichera <kernel@xxxxxxxxxxxxx> wrote: >> On 10/27/2015 07:57 PM, Fabio Estevam wrote: >>> [Adding Roberto in the thread as he is also trying to get SSI TDM support/ >> Thanks Fabio, >> >> I'm also having the same issue but employing SSI in TDM master mode against a SLIC Si32178 >> using its PCM mode. PCLK is at 2048KHz, FSYNC is 8KHz slot length is 32 bits (SSI wants >> this since when in master mode) but valid data set to be 8bits in the SSI register. >> >> My Current situation is that I've a custom fsl_ssi.c driver to control the SSI in TDM master mode >> both PCLK and FSYNC works perfectly fine, the SLIC has a register that I can check via SPI for >> such purpose, I can see the clocking status from its side. The main problem I've is exactly the same >> Caleb is having, after a certain amount of SDMA transfers, roughly 1000 or so, everything stops >> without any apparent reason. > My problem is that the channels randomly slip a slot and all words end > up in the wrong slot. I suspect this is a DMA issue, but I really > haven't diagnosed it yet. I don't get a full stop on the data. Ah! Ok! > FYI, I'm using a very recent 4.3 kernel from linus's repo, but 4.2 > behaved the same. Can you please post the code you are using to setup the SSI, what PCLK and FSYNC rates? Did you have your own DMA handling? > > -Caleb > >>> On Tue, Oct 27, 2015 at 2:45 PM, Fabio Estevam <festevam@xxxxxxxxx> wrote: >>>> On Tue, Oct 27, 2015 at 2:42 PM, Caleb Crome <caleb@xxxxxxxxx> wrote: >>>>> On Tue, Oct 27, 2015 at 9:10 AM, Fabio Estevam <festevam@xxxxxxxxx> wrote: >>>>>> On Tue, Oct 27, 2015 at 2:02 PM, Caleb Crome <caleb@xxxxxxxxx> wrote: >>>>>> >>>>>>>> Could you please try it without using the external SDMA firmware? >>>>>>> I do need *some* SDMA firmware, correct? The firmware that I'm using >>>>>>> ends up in /lib/firmware/imx/sdma/sdma-imx6q.bin and is md5sum >>>>>>> 5d4584134cc4cba62e1be2f382cd6f3a. >>>>>> SSI can operate with the ROM SDMA firmware. >>>>>> >>>>>> I would like to know if this issue also happens if you don't pass the >>>>>> external firmware and use the internal ROM SDMA firmware instead. >>>>> Ah, good to know. Do I just remove reference in the .dtsi file? >>>>> Remove the file from the filesystem? I'll do both to be doubly sure >>>>> :-) >>>> Just remove it from the rootfs. Then you will see a message from the >>>> kernel saying that no external SDMA firmware could be found and that >>>> the internal one is going to be used. >>>> >>>>>> Also, could you try bumping the SSI and SDMA clock rates at the maximum? >>>>> Any idea how I do that? I guess it's in the .dtsi file perhaps? I'll >>>>> poke around. >>>> You can try to call clk_set_rate() with the maximum allowed frequency >>>> inside the ssi driver. I don't recall on top of my head what is this >>>> value though. >>>> >>>> Regards, >>>> >>>> Fabio Estevam >>> _______________________________________________ >>> Alsa-devel mailing list >>> Alsa-devel@xxxxxxxxxxxxxxxx >>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel >>> > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@xxxxxxxxxxxxxxxx > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
