96aa0c6b0b
Patches from Raspberry Pi repo: https://github.com/raspberrypi/linux/commits/rpi-4.9.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
90 lines
2.7 KiB
Diff
90 lines
2.7 KiB
Diff
From db51b292d97ecb021831ed380ce4e1152b1bd235 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 16 Jan 2017 21:02:26 +0000
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Subject: [PATCH] Revert "bcm2835-i2s: Changes for allowing asymmetric sample
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formats."
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This reverts commit f5a6236a32e82068122301d246a94ca755d61704.
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See: https://github.com/raspberrypi/linux/issues/1799
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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sound/soc/bcm/bcm2835-i2s.c | 54 ++++++++++++++-------------------------------
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1 file changed, 16 insertions(+), 38 deletions(-)
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--- a/sound/soc/bcm/bcm2835-i2s.c
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+++ b/sound/soc/bcm/bcm2835-i2s.c
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@@ -237,9 +237,7 @@ static int bcm2835_i2s_hw_params(struct
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unsigned int sampling_rate = params_rate(params);
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unsigned int data_length, data_delay, bclk_ratio;
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unsigned int ch1pos, ch2pos, mode, format;
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- unsigned int previous_ftxp, previous_frxp;
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uint32_t csreg;
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- bool packed;
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/*
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* If a stream is already enabled,
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@@ -322,46 +320,26 @@ static int bcm2835_i2s_hw_params(struct
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return -EINVAL;
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}
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- /* Set the format for the matching stream direction. */
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- switch (substream->stream) {
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- case SNDRV_PCM_STREAM_PLAYBACK:
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- regmap_write(dev->i2s_regmap, BCM2835_I2S_TXC_A_REG, format);
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- break;
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- case SNDRV_PCM_STREAM_CAPTURE:
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- regmap_write(dev->i2s_regmap, BCM2835_I2S_RXC_A_REG, format);
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- break;
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- default:
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- return -EINVAL;
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- }
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+ /*
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+ * Set format for both streams.
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+ * We cannot set another frame length
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+ * (and therefore word length) anyway,
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+ * so the format will be the same.
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+ */
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+ regmap_write(dev->i2s_regmap, BCM2835_I2S_RXC_A_REG, format);
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+ regmap_write(dev->i2s_regmap, BCM2835_I2S_TXC_A_REG, format);
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/* Setup the I2S mode */
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- /* Keep existing FTXP and FRXP values. */
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- regmap_read(dev->i2s_regmap, BCM2835_I2S_MODE_A_REG, &mode);
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-
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- previous_ftxp = mode & BCM2835_I2S_FTXP;
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- previous_frxp = mode & BCM2835_I2S_FRXP;
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-
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mode = 0;
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- /*
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- * Retain the frame packed mode (2 channels per 32 bit word)
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- * of the other direction stream intact. The formats of each
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- * direction can be different as long as the frame length is
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- * shared for both.
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- */
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- packed = data_length <= 16;
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-
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- switch (substream->stream) {
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- case SNDRV_PCM_STREAM_PLAYBACK:
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- mode |= previous_frxp;
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- mode |= packed ? BCM2835_I2S_FTXP : 0;
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- break;
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- case SNDRV_PCM_STREAM_CAPTURE:
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- mode |= previous_ftxp;
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- mode |= packed ? BCM2835_I2S_FRXP : 0;
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- break;
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- default:
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- return -EINVAL;
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+ if (data_length <= 16) {
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+ /*
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+ * Use frame packed mode (2 channels per 32 bit word)
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+ * We cannot set another frame length in the second stream
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+ * (and therefore word length) anyway,
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+ * so the format will be the same.
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+ */
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+ mode |= BCM2835_I2S_FTXP | BCM2835_I2S_FRXP;
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}
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mode |= BCM2835_I2S_FLEN(bclk_ratio - 1);
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