mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 07:22:33 +00:00
97 lines
3.0 KiB
Diff
97 lines
3.0 KiB
Diff
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(-)
|
|
|
|
--- 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
|
|
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
|
|
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
|
|
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);
|