ASoC: sirf-usp: Fixed a bug for playback and capture work at the same time

1. The startup function invoked when the playback and capture.
   If start playback when capturing, the registers are re-initinitialised.
   That cause the playback fail. So move the startup code into runtime resume.
2. Modified: If non RUNTIME_PM support, the probe need enable clock and
   initinitialise registers.
3. Refine code.

Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/sirf/sirf-usp.c

@@ -103,11 +103,8 @@ static int sirf_usp_pcm_set_dai_fmt(struct snd_soc_dai *dai,
 	return 0;
 }
 
-static int sirf_usp_i2s_startup(struct snd_pcm_substream *substream,
-		struct snd_soc_dai *dai)
+static void sirf_usp_i2s_init(struct sirf_usp *usp)
 {
-	struct sirf_usp *usp = snd_soc_dai_get_drvdata(dai);
-
 	/* Configure RISC mode */
 	regmap_update_bits(usp->regmap, USP_RISC_DSP_MODE,
 		USP_RISC_DSP_SEL, ~USP_RISC_DSP_SEL);
@@ -119,19 +116,16 @@ static int sirf_usp_i2s_startup(struct snd_pcm_substream *substream,
 	regmap_write(usp->regmap, USP_TX_DMA_IO_LEN, 0);
 	regmap_write(usp->regmap, USP_RX_DMA_IO_LEN, 0);
 
-	regmap_write(usp->regmap, USP_RX_FRAME_CTRL, USP_SINGLE_SYNC_MODE);
-
-	regmap_write(usp->regmap, USP_TX_FRAME_CTRL, USP_TXC_SLAVE_CLK_SAMPLE);
-
 	/* Configure Mode2 register */
 	regmap_write(usp->regmap, USP_MODE2, (1 << USP_RXD_DELAY_LEN_OFFSET) |
-		(0 << USP_TXD_DELAY_LEN_OFFSET));
+		(0 << USP_TXD_DELAY_LEN_OFFSET) |
+		USP_TFS_CLK_SLAVE_MODE | USP_RFS_CLK_SLAVE_MODE);
 
 	/* Configure Mode1 register */
 	regmap_write(usp->regmap, USP_MODE1,
 		USP_SYNC_MODE | USP_EN | USP_TXD_ACT_EDGE_FALLING |
 		USP_RFS_ACT_LEVEL_LOGIC1 | USP_TFS_ACT_LEVEL_LOGIC1 |
-		USP_TX_UFLOW_REPEAT_ZERO);
+		USP_TX_UFLOW_REPEAT_ZERO | USP_CLOCK_MODE_SLAVE);
 
 	/* Configure RX DMA IO Control register */
 	regmap_write(usp->regmap, USP_RX_DMA_IO_CTRL, 0);
@@ -155,8 +149,6 @@ static int sirf_usp_i2s_startup(struct snd_pcm_substream *substream,
 	/* Congiure TX FIFO Level Check register */
 	regmap_write(usp->regmap, USP_TX_FIFO_LEVEL_CHK,
 		TX_FIFO_SC(0x1B) | TX_FIFO_LC(0x0E) | TX_FIFO_HC(0x04));
-
-	return 0;
 }
 
 static int sirf_usp_pcm_hw_params(struct snd_pcm_substream *substream,
@@ -204,23 +196,19 @@ static int sirf_usp_pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		regmap_update_bits(usp->regmap, USP_TX_FRAME_CTRL,
 			USP_TXC_DATA_LEN_MASK | USP_TXC_FRAME_LEN_MASK
-			| USP_TXC_SHIFTER_LEN_MASK,
+			| USP_TXC_SHIFTER_LEN_MASK | USP_TXC_SLAVE_CLK_SAMPLE,
 			((data_len - 1) << USP_TXC_DATA_LEN_OFFSET)
 			| ((frame_len - 1) << USP_TXC_FRAME_LEN_OFFSET)
-			| ((shifter_len - 1) << USP_TXC_SHIFTER_LEN_OFFSET));
+			| ((shifter_len - 1) << USP_TXC_SHIFTER_LEN_OFFSET)
+			| USP_TXC_SLAVE_CLK_SAMPLE);
 	else
 		regmap_update_bits(usp->regmap, USP_RX_FRAME_CTRL,
 			USP_RXC_DATA_LEN_MASK | USP_RXC_FRAME_LEN_MASK
-			| USP_RXC_SHIFTER_LEN_MASK,
+			| USP_RXC_SHIFTER_LEN_MASK | USP_SINGLE_SYNC_MODE,
 			((data_len - 1) << USP_RXC_DATA_LEN_OFFSET)
 			| ((frame_len - 1) << USP_RXC_FRAME_LEN_OFFSET)
-			| ((shifter_len - 1) << USP_RXC_SHIFTER_LEN_OFFSET));
-
-	regmap_update_bits(usp->regmap, USP_MODE1,
-			USP_CLOCK_MODE_SLAVE, USP_CLOCK_MODE_SLAVE);
-	regmap_update_bits(usp->regmap, USP_MODE2,
-			USP_TFS_CLK_SLAVE_MODE | USP_RFS_CLK_SLAVE_MODE,
-			USP_TFS_CLK_SLAVE_MODE | USP_RFS_CLK_SLAVE_MODE);
+			| ((shifter_len - 1) << USP_RXC_SHIFTER_LEN_OFFSET)
+			| USP_SINGLE_SYNC_MODE);
 
 	return 0;
 }
@@ -253,7 +241,6 @@ static int sirf_usp_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
 }
 
 static const struct snd_soc_dai_ops sirf_usp_pcm_dai_ops = {
-	.startup = sirf_usp_i2s_startup,
 	.trigger = sirf_usp_pcm_trigger,
 	.set_fmt = sirf_usp_pcm_set_dai_fmt,
 	.hw_params = sirf_usp_pcm_hw_params,
@@ -282,7 +269,6 @@ static struct snd_soc_dai_driver sirf_usp_pcm_dai = {
 	.ops = &sirf_usp_pcm_dai_ops,
 };
 
-#ifdef CONFIG_PM
 static int sirf_usp_pcm_runtime_suspend(struct device *dev)
 {
 	struct sirf_usp *usp = dev_get_drvdata(dev);
@@ -293,9 +279,15 @@ static int sirf_usp_pcm_runtime_suspend(struct device *dev)
 static int sirf_usp_pcm_runtime_resume(struct device *dev)
 {
 	struct sirf_usp *usp = dev_get_drvdata(dev);
-	return clk_prepare_enable(usp->clk);
+	int ret;
+	ret = clk_prepare_enable(usp->clk);
+	if (ret) {
+		dev_err(dev, "clk_enable failed: %d\n", ret);
+		return ret;
+	}
+	sirf_usp_i2s_init(usp);
+	return 0;
 }
-#endif
 
 #ifdef CONFIG_PM_SLEEP
 static int sirf_usp_pcm_suspend(struct device *dev)
@@ -369,6 +361,11 @@ static int sirf_usp_pcm_probe(struct platform_device *pdev)
 	}
 
 	pm_runtime_enable(&pdev->dev);
+	if (!pm_runtime_enabled(&pdev->dev)) {
+		ret = sirf_usp_pcm_runtime_resume(&pdev->dev);
+		if (ret)
+			return ret;
+	}
 
 	ret = devm_snd_soc_register_component(&pdev->dev, &sirf_usp_component,
 		&sirf_usp_pcm_dai, 1);
@@ -381,7 +378,10 @@ static int sirf_usp_pcm_probe(struct platform_device *pdev)
 
 static int sirf_usp_pcm_remove(struct platform_device *pdev)
 {
-	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_enabled(&pdev->dev))
+		sirf_usp_pcm_runtime_suspend(&pdev->dev);
+	else
+		pm_runtime_disable(&pdev->dev);
 	return 0;
 }