[v2,1/3] ASoC: atmel_ssc_dai: make option to choose clock

Commit Message

Bo Shen Jan. 27, 2014, 6:55 a.m. UTC

When SSC works in slave mode, according to the hardware design, the
clock can get from TK pin, also can get from RK pin. So, add one
parameter to choose where the clock from.

Signed-off-by: Bo Shen <[e-mail]>
---
Changes in v2: None

 sound/soc/atmel/atmel_ssc_dai.c | 16 ++++++++++++----
 sound/soc/atmel/atmel_ssc_dai.h |  1 +
 2 files changed, 13 insertions(+), 4 deletions(-)

Comments

Lars-Peter Clausen Jan. 27, 2014, 7:06 a.m. UTC | #1

On 01/27/2014 07:55 AM, Bo Shen wrote:
> When SSC works in slave mode, according to the hardware design, the
> clock can get from TK pin, also can get from RK pin. So, add one
> parameter to choose where the clock from.
> 
> Signed-off-by: Bo Shen <[e-mail]>
> ---
> Changes in v2: None
> 
>  sound/soc/atmel/atmel_ssc_dai.c | 16 ++++++++++++----
>  sound/soc/atmel/atmel_ssc_dai.h |  1 +
>  2 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
> index 8697ced..03eb0be 100644
> --- a/sound/soc/atmel/atmel_ssc_dai.c
> +++ b/sound/soc/atmel/atmel_ssc_dai.c
> @@ -340,6 +340,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
>  	struct snd_soc_dai *dai)
>  {
>  	int id = dai->id;
> +	struct snd_soc_card *card = dai->card;
>  	struct atmel_ssc_info *ssc_p = &ssc_info[id];
>  	struct atmel_pcm_dma_params *dma_params;
>  	int dir, channels, bits;
> @@ -347,6 +348,9 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
>  	int start_event;
>  	int ret;
>  
> +	ssc_p->clk_from_rk_pin =
> +		((struct atmel_ssc_info *)(card->drvdata))->clk_from_rk_pin;

This is a layering violation. The DAI driver is not supposed to make any
assumptions what drvdata is attached to the card. Use the set_sysclk API to
set the source clock.

- Lars

Patch

diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
index 8697ced..03eb0be 100644
--- a/sound/soc/atmel/atmel_ssc_dai.c
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -340,6 +340,7 @@  static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	int id = dai->id;
+	struct snd_soc_card *card = dai->card;
 	struct atmel_ssc_info *ssc_p = &ssc_info[id];
 	struct atmel_pcm_dma_params *dma_params;
 	int dir, channels, bits;
@@ -347,6 +348,9 @@  static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
 	int start_event;
 	int ret;
 
+	ssc_p->clk_from_rk_pin =
+		((struct atmel_ssc_info *)(card->drvdata))->clk_from_rk_pin;
+
 	/*
 	 * Currently, there is only one set of dma params for
 	 * each direction.  If more are added, this code will
@@ -466,7 +470,8 @@  static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
 			| SSC_BF(RCMR_START, start_event)
 			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
 			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
-			| SSC_BF(RCMR_CKS, SSC_CKS_CLOCK);
+			| SSC_BF(RCMR_CKS, ssc_p->clk_from_rk_pin ?
+					   SSC_CKS_PIN : SSC_CKS_CLOCK);
 
 		rfmr =	  SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 			| SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
@@ -481,7 +486,8 @@  static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
 			| SSC_BF(TCMR_START, start_event)
 			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
 			| SSC_BF(TCMR_CKO, SSC_CKO_NONE)
-			| SSC_BF(TCMR_CKS, SSC_CKS_PIN);
+			| SSC_BF(TCMR_CKS, ssc_p->clk_from_rk_pin ?
+					   SSC_CKS_CLOCK : SSC_CKS_PIN);
 
 		tfmr =	  SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 			| SSC_BF(TFMR_FSDEN, 0)
@@ -550,7 +556,8 @@  static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
 			| 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);
+			| SSC_BF(RCMR_CKS, ssc_p->clk_from_rk_pin ?
+					   SSC_CKS_PIN : SSC_CKS_CLOCK);
 
 		rfmr =	  SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 			| SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
@@ -565,7 +572,8 @@  static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
 			| 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);
+			| SSC_BF(RCMR_CKS, ssc_p->clk_from_rk_pin ?
+					   SSC_CKS_CLOCK : SSC_CKS_PIN);
 
 		tfmr =	  SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 			| SSC_BF(TFMR_FSDEN, 0)
diff --git a/sound/soc/atmel/atmel_ssc_dai.h b/sound/soc/atmel/atmel_ssc_dai.h
index b1f08d5..f147895 100644
--- a/sound/soc/atmel/atmel_ssc_dai.h
+++ b/sound/soc/atmel/atmel_ssc_dai.h
@@ -113,6 +113,7 @@  struct atmel_ssc_info {
 	unsigned short cmr_div;
 	unsigned short tcmr_period;
 	unsigned short rcmr_period;
+	bool clk_from_rk_pin;
 	struct atmel_pcm_dma_params *dma_params[2];
 	struct atmel_ssc_state ssc_state;
 };