On 01/12/2017 09:35 AM, Matt Ranostay wrote: > We can get audio errors if hitting deeper idle states on omaps: > > [alsa.c:230] error: Fatal problem with alsa output, error -5. > [audio.c:614] error: Error in writing audio (Input/output error?)! > > This seems to happen with off mode idle enabled as power for the > whole SoC may get cut off between filling the McBSP fifo using DMA. > While active DMA blocks deeper idle states in hardware, McBSP > activity does not seem to do so. > > Basing the QoS latency calculation on the FIFO size, threshold, > sample rate, and channels. > > Based on the original patch by Tony Lindgren > Link: https://patchwork.kernel.org/patch/9305867/ > > Cc: Tony Lindgren <tony@xxxxxxxxxxx> > Cc: Peter Ujfalusi <peter.ujfalusi@xxxxxx> > Signed-off-by: Matt Ranostay <matt@ranostay.consulting> > --- > Changes from v1: > * add calculations for latency per number of FIFO locations > > Changes from v2: > * add missing mcbsp.h header change > > Changes from v3: > * base the latency calculations on threshold, buffer size, sample > rate, and channels > > Changes from v4: > * using Peter Ujfalusi's suggestions for restoring a higher latency on > audio stream completion, or if not applicable remove the QoS request > > Changes from v5: > * clean up latency checking logic > * move logic to .prepare and .shutdown to avoid functions that can sleep > > Changes from v6: > * move QoS removal to asoc_mcbsp_remove from omap_mcbsp_cleanup Looks good. You can add my Acked-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx> to v7... > > sound/soc/omap/mcbsp.c | 1 + > sound/soc/omap/mcbsp.h | 3 +++ > sound/soc/omap/omap-mcbsp.c | 47 ++++++++++++++++++++++++++++++++++++++++++++- > 3 files changed, 50 insertions(+), 1 deletion(-) > > diff --git a/sound/soc/omap/mcbsp.c b/sound/soc/omap/mcbsp.c > index 06fec5699cc8..8fdb949a266e 100644 > --- a/sound/soc/omap/mcbsp.c > +++ b/sound/soc/omap/mcbsp.c > @@ -25,6 +25,7 @@ > #include <linux/io.h> > #include <linux/slab.h> > #include <linux/pm_runtime.h> > +#include <linux/pm_qos.h> Which would not add this include line ;) > > #include <linux/platform_data/asoc-ti-mcbsp.h> > -- Péter -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
