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The period size represents the size of the DMA descriptor. To ensure all DMA descriptors start from a well-aligned address, the period size must be divided by (sample size * maxburst), not just by maxburst. This adjustment allows for computing a higher maxburst value, thereby increasing the performance of the DMA transfer. Previously, snd_pcm_lib_period_bytes() returned 0 because the runtime HW parameters are computed after the hw_params() callbacks are used. To address this, we now use params_*() functions to compute the period size accurately. This change optimizes the DMA transfer performance by ensuring proper alignment and efficient use of maxburst values. [andrei.simion@microchip.com: Reword commit message and commit title. Add macros with values for maximum DMA chunk size allowed. Add DMA_BURST_ALIGNED preprocessor function to check the alignment of the DMA burst] Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com> Signed-off-by: Andrei Simion <andrei.simion@microchip.com> Link: https://patch.msgid.link/20240905095633.113784-1-andrei.simion@microchip.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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| .. | ||
| atmel_ssc_dai.c | ||
| atmel_ssc_dai.h | ||
| atmel_wm8904.c | ||
| atmel-classd.c | ||
| atmel-classd.h | ||
| atmel-i2s.c | ||
| atmel-pcm-dma.c | ||
| atmel-pcm-pdc.c | ||
| atmel-pcm.h | ||
| atmel-pdmic.c | ||
| atmel-pdmic.h | ||
| Kconfig | ||
| Makefile | ||
| mchp-i2s-mcc.c | ||
| mchp-pdmc.c | ||
| mchp-spdifrx.c | ||
| mchp-spdiftx.c | ||
| mikroe-proto.c | ||
| sam9g20_wm8731.c | ||
| sam9x5_wm8731.c | ||
| tse850-pcm5142.c | ||