calculate the percentage of cpu cyle based on the CCOUNT register. which can tell the percentage of cpu cycle usage.
Signed-off-by: Wu Zhigang zhigang.wu@linux.intel.com --- src/audio/dai.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/src/audio/dai.c b/src/audio/dai.c index 99749d1..7811e38 100644 --- a/src/audio/dai.c +++ b/src/audio/dai.c @@ -72,6 +72,21 @@ struct dai_data { uint64_t wallclock; /* wall clock at stream start */ };
+/* for apollolake, it is 400MHz per 1s */ +#define CPU_CYCLE_PER_MS 400000 + +static void calc_mcps(struct pipeline *p) +{ + uint32_t cpu_cycle = 0; + uint32_t deta = 0; + + __asm__ __volatile__ ("rsr %0, CCOUNT" : "=a" (cpu_cycle) : : "memory"); + deta = cpu_cycle - p->cpu_cycle; + p->cpu_cycle = cpu_cycle; + deta = (deta * 100) / CPU_CYCLE_PER_MS; + trace_error_value(deta); /* the percentage of the cpu cycle in 1ms */ +} + /* this is called by DMA driver every time descriptor has completed */ static void dai_dma_cb(void *data, uint32_t type, struct dma_sg_elem *next) { @@ -81,6 +96,8 @@ static void dai_dma_cb(void *data, uint32_t type, struct dma_sg_elem *next)
tracev_dai("irq");
+ calc_mcps(dev->pipeline); + /* stop dma copy for pause/stop/xrun */ if (dev->state != COMP_STATE_ACTIVE || dd->xrun) {