From 9e381efc19fc941ec11b1fdf73ba6b7cc5beea99 Mon Sep 17 00:00:00 2001 From: Tomasz Figa Date: Sun, 11 Aug 2013 19:59:21 +0200 Subject: ASoC: Samsung: Do not queue cyclic buffers multiple times The legacy S3C-DMA API required every period of a cyclic buffer to be queued separately. After conversion of Samsung ASoC to Samsung DMA wrappers somebody made an assumption that the same is needed for DMA engine API, which is not true. In effect, Samsung ASoC DMA code was queuing the whole cyclic buffer multiple times with a shift of one period per iteration, leading to: a) severe memory waste - up to 13x times more DMA transfer descriptors are allocated than needed, b) possible memory corruption, because further cyclic buffers were out of the original buffers, due to the offset. This patch fixes this problem by making the legacy S3C-DMA API use the same semantics as DMA engine (the whole cyclic buffer is enqueued at once) and modifying users of Samsung DMA wrappers in cyclic mode to behave appropriately. Change-Id: Ib9e656c40ef71e2e90af3f008959eeae19ce7d7e Signed-off-by: Tomasz Figa Acked-by: Linus Walleij Signed-off-by: Mark Brown --- arch/arm/plat-samsung/s3c-dma-ops.c | 13 +++++++++++-- sound/soc/samsung/dma.c | 7 +++++++ 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/arch/arm/plat-samsung/s3c-dma-ops.c b/arch/arm/plat-samsung/s3c-dma-ops.c index 0cc40aea3f5..98b10ba67dc 100644 --- a/arch/arm/plat-samsung/s3c-dma-ops.c +++ b/arch/arm/plat-samsung/s3c-dma-ops.c @@ -82,7 +82,8 @@ static int s3c_dma_config(unsigned ch, struct samsung_dma_config *param) static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep *param) { struct cb_data *data; - int len = (param->cap == DMA_CYCLIC) ? param->period : param->len; + dma_addr_t pos = param->buf; + dma_addr_t end = param->buf + param->len; list_for_each_entry(data, &dma_list, node) if (data->ch == ch) @@ -94,7 +95,15 @@ static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep *param) data->fp_param = param->fp_param; } - s3c2410_dma_enqueue(ch, (void *)data, param->buf, len); + if (param->cap != DMA_CYCLIC) { + s3c2410_dma_enqueue(ch, (void *)data, param->buf, param->len); + return 0; + } + + while (pos < end) { + s3c2410_dma_enqueue(ch, (void *)data, pos, param->period); + pos += param->period; + } return 0; } diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c index 21b79262010..6e2b2b4dca5 100644 --- a/sound/soc/samsung/dma.c +++ b/sound/soc/samsung/dma.c @@ -90,6 +90,13 @@ static void dma_enqueue(struct snd_pcm_substream *substream) dma_info.period = prtd->dma_period; dma_info.len = prtd->dma_period*limit; + if (dma_info.cap == DMA_CYCLIC) { + dma_info.buf = pos; + prtd->params->ops->prepare(prtd->params->ch, &dma_info); + prtd->dma_loaded += limit; + return; + } + while (prtd->dma_loaded < limit) { pr_debug("dma_loaded: %d\n", prtd->dma_loaded); -- cgit v1.2.3