linux-kernel - [PATCH 3/3] ASoC: ux500: Add DMA slave config prepare routine

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 12 Jun 2013 09:57:59 +0200
From:	Fabio Baltieri <fabio.baltieri@...aro.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Lee Jones <lee.jones@...aro.org>,
	Ola Lilja <ola.o.lilja@...ricsson.com>,
	Fabio Baltieri <fabio.baltieri@...aro.org>
Subject: [PATCH 3/3] ASoC: ux500: Add DMA slave config prepare routine

Implement a DMA slave config prepare routine, as until now the MSP
driver depended on the DMA controller completing the channel
configuration on its own, but this is not the case anymore since the
recent DMA driver updates.

Signed-off-by: Fabio Baltieri <fabio.baltieri@...aro.org>
---
 sound/soc/ux500/ux500_pcm.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/sound/soc/ux500/ux500_pcm.c b/sound/soc/ux500/ux500_pcm.c
index b6e5ae2..5f01c19 100644
--- a/sound/soc/ux500/ux500_pcm.c
+++ b/sound/soc/ux500/ux500_pcm.c
@@ -103,10 +103,40 @@ static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
 	return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
 }
 
+static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *params,
+		struct dma_slave_config *slave_config)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct ux500_msp_dma_params *dma_params;
+	struct stedma40_chan_cfg *dma_cfg;
+	int ret;
+
+	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+	dma_cfg = dma_params->dma_cfg;
+
+	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
+	if (ret)
+		return ret;
+
+	slave_config->dst_maxburst = 4;
+	slave_config->dst_addr_width = dma_cfg->dst_info.data_width;
+	slave_config->src_maxburst = 4;
+	slave_config->src_addr_width = dma_cfg->src_info.data_width;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		slave_config->dst_addr = dma_params->tx_rx_addr;
+	else
+		slave_config->src_addr = dma_params->tx_rx_addr;
+
+	return 0;
+}
+
 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
 	.pcm_hardware = &ux500_pcm_hw,
 	.compat_request_channel = ux500_pcm_request_chan,
 	.prealloc_buffer_size = 128 * 1024,
+	.prepare_slave_config = ux500_pcm_prepare_slave_config,
 };
 
 int ux500_pcm_register_platform(struct platform_device *pdev)
-- 
1.8.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/