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From ba1f22a0d2179a0201e764c341d9dbf8f1c27ffe Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 16 Jan 2017 20:58:18 +0000
Subject: [PATCH] Revert "bcm2835-i2s: Changes for allowing asymmetric sample
formats. (#1783)"
This reverts commit 4897c5c2f7adb4f77d638121e9959174dff87b9c.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
See: https://github.com/raspberrypi/linux/issues/1799
---
sound/soc/bcm/bcm2835-i2s.c | 54 ++++++++++++++-------------------------------
1 file changed, 16 insertions(+), 38 deletions(-)
diff --git a/sound/soc/bcm/bcm2835-i2s.c b/sound/soc/bcm/bcm2835-i2s.c
index d2b0801..aedb01f 100644
--- a/sound/soc/bcm/bcm2835-i2s.c
+++ b/sound/soc/bcm/bcm2835-i2s.c
@@ -310,7 +310,6 @@ static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream,
unsigned int sampling_rate = params_rate(params);
unsigned int data_length, data_delay, bclk_ratio;
unsigned int ch1pos, ch2pos, mode, format;
- unsigned int previous_ftxp, previous_frxp;
unsigned int mash = BCM2835_CLK_MASH_1;
unsigned int divi, divf, target_frequency;
int clk_src = -1;
@@ -321,7 +320,6 @@ static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream,
bool frame_master = (master == SND_SOC_DAIFMT_CBS_CFS
|| master == SND_SOC_DAIFMT_CBM_CFS);
uint32_t csreg;
- bool packed;
/*
* If a stream is already enabled,
@@ -467,46 +465,26 @@ static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream,
return -EINVAL;
}
- /* Set the format for the matching stream direction. */
- switch (substream->stream) {
- case SNDRV_PCM_STREAM_PLAYBACK:
- regmap_write(dev->i2s_regmap, BCM2835_I2S_TXC_A_REG, format);
- break;
- case SNDRV_PCM_STREAM_CAPTURE:
- regmap_write(dev->i2s_regmap, BCM2835_I2S_RXC_A_REG, format);
- break;
- default:
- return -EINVAL;
- }
+ /*
+ * Set format for both streams.
+ * We cannot set another frame length
+ * (and therefore word length) anyway,
+ * so the format will be the same.
+ */
+ regmap_write(dev->i2s_regmap, BCM2835_I2S_RXC_A_REG, format);
+ regmap_write(dev->i2s_regmap, BCM2835_I2S_TXC_A_REG, format);
/* Setup the I2S mode */
- /* Keep existing FTXP and FRXP values. */
- regmap_read(dev->i2s_regmap, BCM2835_I2S_MODE_A_REG, &mode);
-
- previous_ftxp = mode & BCM2835_I2S_FTXP;
- previous_frxp = mode & BCM2835_I2S_FRXP;
-
mode = 0;
- /*
- * Retain the frame packed mode (2 channels per 32 bit word)
- * of the other direction stream intact. The formats of each
- * direction can be different as long as the frame length is
- * shared for both.
- */
- packed = data_length <= 16;
-
- switch (substream->stream) {
- case SNDRV_PCM_STREAM_PLAYBACK:
- mode |= previous_frxp;
- mode |= packed ? BCM2835_I2S_FTXP : 0;
- break;
- case SNDRV_PCM_STREAM_CAPTURE:
- mode |= previous_ftxp;
- mode |= packed ? BCM2835_I2S_FRXP : 0;
- break;
- default:
- return -EINVAL;
+ if (data_length <= 16) {
+ /*
+ * Use frame packed mode (2 channels per 32 bit word)
+ * We cannot set another frame length in the second stream
+ * (and therefore word length) anyway,
+ * so the format will be the same.
+ */
+ mode |= BCM2835_I2S_FTXP | BCM2835_I2S_FRXP;
}
mode |= BCM2835_I2S_FLEN(bclk_ratio - 1);
--
2.1.4
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