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Commit b0a2712f authored by John Bonesio's avatar John Bonesio Committed by Mark Brown
Browse files

ASoC: MPC5200: Support for buffer wrap around 



The code in psc_dma_bcom_enqueue_tx() didn't account for the fact that
s->runtime->control->appl_ptr can wrap around to the beginning of the
buffer. This change fixes this problem.

Signed-off-by: default avatarJohn Bonesio <bones@secretlab.ca>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 4bc4c9a5

sound/soc/fsl/mpc5200_dma.c

+17 −0
Original line number Diff line number Diff line
@@ -69,6 +69,23 @@ static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s) 


static void psc_dma_bcom_enqueue_tx(struct psc_dma_stream *s)

{

	if (s->appl_ptr > s->runtime->control->appl_ptr) {

		/*

		 * In this case s->runtime->control->appl_ptr has wrapped around.

		 * Play the data to the end of the boundary, then wrap our own

		 * appl_ptr back around.

		 */

		while (s->appl_ptr < s->runtime->boundary) {

			if (bcom_queue_full(s->bcom_task))

				return;



			s->appl_ptr += s->period_size;



			psc_dma_bcom_enqueue_next_buffer(s);

		}

		s->appl_ptr -= s->runtime->boundary;

	}



	while (s->appl_ptr < s->runtime->control->appl_ptr) {



		if (bcom_queue_full(s->bcom_task))