Hi Maciej, On Fri, May 8, 2015 at 8:14 PM, Maciej S. Szmigiero <m...@maciej.szmigiero.name> wrote:
> I currently have audio running on this board at kernel based on > vanilla 3.19 and porting required changes part-by-part to linux-next. > > Changes required on vanilla 3.19 to have it working are: > * AC'97 audio support needs to be added to fsl-asoc-card, > > * AC'97 CODEC platform device needs to be instantiated in fsl_ssi, > > * IPG clock needs to be enabled in fsl_ssi AC'97 mode, > so AC'97 regs can be accessed, > > * Few small fixes for AC'97 mode in fsl_ssi (missing switch label > for format, missing fsl_ssi_dai_probe entry in fsl_ssi_ac97_dai, > etc.). > > There also is a problem with this CODEC that it seems to pull samples > for S/PDIF output from time to time even if S/PDIF output is disabled. > > By default this requests samples in AC'97 slots 10/11 via SLOTREQ, > which in turn causes SSI to enable these slots in SACCST register > and start sending half of the sound samples there. > > The end result is that audio suddenly starts to play two times > too fast. > > Currently, I have a workaround of setting S/PDIF slot assignment > in CODEC to first front pair so at least it doesn't affect > playback rate. > > If you like to have these changes or DT file diff then naturally > I can share them, just they aren't production-quality as of now. Good job! Please keep me on Cc when you submit further ac97 patches / udoo dts, so that I can help testing them. Thanks, Fabio Estevam -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
