---

yaml
---
r: 206588
b: refs/heads/master
c: d9823ed
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ec6375533748806a1a49dad7ce124cc02886854a
+refs/heads/master: d9823ed9fa3126097dfd2bbce6dc33957c1be728

trunk/arch/arm/mach-davinci/include/mach/asp.h

@@ -73,6 +73,39 @@ struct snd_platform_data {
 	 */
 	int clk_input_pin;
 
+	/*
+	 * This flag works when both clock and FS are outputs for the cpu
+	 * and makes clock more accurate (FS is not symmetrical and the
+	 * clock is very fast.
+	 * The clock becoming faster is named
+	 * i2s continuous serial clock (I2S_SCK) and it is an externally
+	 * visible bit clock.
+	 *
+	 * first line : WordSelect
+	 * second line : ContinuousSerialClock
+	 * third line: SerialData
+	 *
+	 * SYMMETRICAL APPROACH:
+	 *   _______________________          LEFT
+	 * _|         RIGHT         |______________________|
+	 *     _   _         _   _   _   _         _   _
+	 *   _| |_| |_ x16 _| |_| |_| |_| |_ x16 _| |_| |_
+	 *     _   _         _   _   _   _         _   _
+	 *   _/ \_/ \_ ... _/ \_/ \_/ \_/ \_ ... _/ \_/ \_
+	 *    \_/ \_/       \_/ \_/ \_/ \_/       \_/ \_/
+	 *
+	 * ACCURATE CLOCK APPROACH:
+	 *   ______________          LEFT
+	 * _|     RIGHT    |_______________________________|
+	 *     _         _   _         _   _   _   _   _   _
+	 *   _| |_ x16 _| |_| |_ x16 _| |_| |_| |_| |_| |_| |
+	 *     _         _   _          _      dummy cycles
+	 *   _/ \_ ... _/ \_/ \_  ... _/ \__________________
+	 *    \_/       \_/ \_/        \_/
+	 *
+	 */
+	bool i2s_accurate_sck;
+
 	/* McASP specific fields */
 	int tdm_slots;
 	u8 op_mode;

trunk/sound/soc/davinci/davinci-i2s.c

@@ -155,6 +155,7 @@ struct davinci_mcbsp_dev {
 	unsigned int fmt;
 	int clk_div;
 	int clk_input_pin;
+	bool i2s_accurate_sck;
 };
 
 static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
@@ -447,11 +448,23 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 		       DAVINCI_MCBSP_SRGR_CLKSM;
 		srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length *
 						8 - 1);
-		/* symmetric waveforms */
-		clk_div = freq / (mcbsp_word_length * 16) /
-			  params->rate_num * params->rate_den;
-		srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length *
-						16 - 1);
+		if (dev->i2s_accurate_sck) {
+			clk_div = 256;
+			do {
+				framesize = (freq / (--clk_div)) /
+				params->rate_num *
+					params->rate_den;
+			} while (((framesize < 33) || (framesize > 4095)) &&
+				 (clk_div));
+			clk_div--;
+			srgr |= DAVINCI_MCBSP_SRGR_FPER(framesize - 1);
+		} else {
+			/* symmetric waveforms */
+			clk_div = freq / (mcbsp_word_length * 16) /
+				  params->rate_num * params->rate_den;
+			srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length *
+							16 - 1);
+		}
 		clk_div &= 0xFF;
 		srgr |= clk_div;
 		break;
@@ -662,6 +675,7 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 		dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].sram_size =
 			pdata->sram_size_capture;
 		dev->clk_input_pin = pdata->clk_input_pin;
+		dev->i2s_accurate_sck = pdata->i2s_accurate_sck;
 	}
 	dev->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dev->clk)) {