* [PATCH] sound/soc/atmel: Add slave mode support to SSC in DSP Mode A
@ 2013-02-20 16:31 Zoltan Puskas
2013-02-20 16:47 ` Mark Brown
0 siblings, 1 reply; 2+ messages in thread
From: Zoltan Puskas @ 2013-02-20 16:31 UTC (permalink / raw)
To: Bo Shen, Mark Brown; +Cc: linux-kernel
From: Zoltan Puskas <zpuskas@dension.com>
Add previously unsupported slave mode to the SSC peripheral when using
DSP/PCM Mode A format on the Atmel ARM platform.
Signed-off-by: Zoltan Puskas <zpuskas@dension.com>
---
The code was tested using WM8804 and WM8731 digital sound chips,
using 3.7.9 and 3.3.1 kernels on a system with AT91SAM9261 CPU
on board.
--- linux-3.7.9/sound/soc/atmel/atmel_ssc_dai.c.orig 2013-02-19 15:43:43.070980604 +0100
+++ linux-3.7.9/sound/soc/atmel/atmel_ssc_dai.c 2013-02-19 15:50:07.613586313 +0100
@@ -543,6 +543,49 @@ static int atmel_ssc_hw_params(struct sn
break;
case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
+ /*
+ * DSP/PCM Mode A format, CODEC supplies BCLK and LRC clocks.
+ *
+ * The SSC transmit clock is obtained from the BCLK signal on
+ * on the TK line, and the SSC receive clock is
+ * generated from the transmit clock.
+ *
+ * Data is transferred on first BCLK after LRC pulse rising
+ * edge.If stereo, the right channel data is contiguous with
+ * the left channel data.
+ */
+ rcmr = SSC_BF(RCMR_PERIOD, 0)
+ | SSC_BF(RCMR_STTDLY, START_DELAY)
+ | SSC_BF(RCMR_START, SSC_START_RISING_RF)
+ | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
+ | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
+ | SSC_BF(RCMR_CKS, SSC_CKS_PIN);
+
+ rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
+ | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
+ | SSC_BF(RFMR_FSLEN, 0)
+ | SSC_BF(RFMR_DATNB, (channels - 1))
+ | SSC_BIT(RFMR_MSBF)
+ | SSC_BF(RFMR_LOOP, 0)
+ | SSC_BF(RFMR_DATLEN, (bits - 1));
+
+ tcmr = SSC_BF(TCMR_PERIOD, 0)
+ | SSC_BF(TCMR_STTDLY, START_DELAY)
+ | SSC_BF(TCMR_START, SSC_START_RISING_RF)
+ | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
+ | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
+ | SSC_BF(TCMR_CKS, SSC_CKS_PIN);
+
+ tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
+ | SSC_BF(TFMR_FSDEN, 0)
+ | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
+ | SSC_BF(TFMR_FSLEN, 0)
+ | SSC_BF(TFMR_DATNB, (channels - 1))
+ | SSC_BIT(TFMR_MSBF)
+ | SSC_BF(TFMR_DATDEF, 0)
+ | SSC_BF(TFMR_DATLEN, (bits - 1));
+ break;
+
default:
printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n",
ssc_p->daifmt);
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] sound/soc/atmel: Add slave mode support to SSC in DSP Mode A
2013-02-20 16:31 [PATCH] sound/soc/atmel: Add slave mode support to SSC in DSP Mode A Zoltan Puskas
@ 2013-02-20 16:47 ` Mark Brown
0 siblings, 0 replies; 2+ messages in thread
From: Mark Brown @ 2013-02-20 16:47 UTC (permalink / raw)
To: Zoltan Puskas; +Cc: Bo Shen, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 319 bytes --]
On Wed, Feb 20, 2013 at 05:31:35PM +0100, Zoltan Puskas wrote:
> From: Zoltan Puskas <zpuskas@dension.com>
>
> Add previously unsupported slave mode to the SSC peripheral when using
> DSP/PCM Mode A format on the Atmel ARM platform.
Applied, but please always use subject lines appropriate for the
subsystem.
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