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| author | Álvaro Fernández Rojas <noltari@gmail.com> | 2016-07-07 09:22:07 +0200 |
|---|---|---|
| committer | Álvaro Fernández Rojas <noltari@gmail.com> | 2016-07-09 16:29:18 +0200 |
| commit | 20402106a376dcc4a766d3b0cee801ce29ba76d5 (patch) | |
| tree | cfd93c19a6766663c4e8537ca8b8b82ad50478ee /target/linux/brcm2708/patches-4.4/0299-bcm2835-i2s-Reduce-the-TX-DREQ-threshold.patch | |
| parent | f1765277bacbea47a45ed913ca8fa043e9f71393 (diff) | |
| download | upstream-20402106a376dcc4a766d3b0cee801ce29ba76d5.tar.gz upstream-20402106a376dcc4a766d3b0cee801ce29ba76d5.tar.bz2 upstream-20402106a376dcc4a766d3b0cee801ce29ba76d5.zip | |
brcm2708: update linux 4.4 patches to latest version
As usual these patches were extracted and rebased from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0299-bcm2835-i2s-Reduce-the-TX-DREQ-threshold.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0299-bcm2835-i2s-Reduce-the-TX-DREQ-threshold.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0299-bcm2835-i2s-Reduce-the-TX-DREQ-threshold.patch b/target/linux/brcm2708/patches-4.4/0299-bcm2835-i2s-Reduce-the-TX-DREQ-threshold.patch new file mode 100644 index 0000000000..d4b4492d6b --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0299-bcm2835-i2s-Reduce-the-TX-DREQ-threshold.patch @@ -0,0 +1,48 @@ +From c2dd47a309d6eee486191ef7805ba3f544ff3dae Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Thu, 21 Apr 2016 15:44:14 +0100 +Subject: [PATCH 299/423] bcm2835-i2s: Reduce the TX DREQ threshold + +TX FIFO overrun is thought to be the cause of channel swapping, so +reducing the DREQ threshold seems reasonable and appears to be +effective. + +See: https://github.com/raspberrypi/linux/issues/1417 + +Signed-off-by: Phil Elwell <phil@raspberrypi.org> +--- + sound/soc/bcm/bcm2835-i2s.c | 21 ++++++++++++++------- + 1 file changed, 14 insertions(+), 7 deletions(-) + +--- a/sound/soc/bcm/bcm2835-i2s.c ++++ b/sound/soc/bcm/bcm2835-i2s.c +@@ -555,15 +555,22 @@ static int bcm2835_i2s_hw_params(struct + + /* Setup the DMA parameters */ + regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, +- BCM2835_I2S_RXTHR(1) +- | BCM2835_I2S_TXTHR(1) +- | BCM2835_I2S_DMAEN, 0xffffffff); ++ BCM2835_I2S_RXTHR(3) ++ | BCM2835_I2S_TXTHR(3) ++ | BCM2835_I2S_DMAEN, ++ BCM2835_I2S_RXTHR(1) ++ | BCM2835_I2S_TXTHR(1) ++ | BCM2835_I2S_DMAEN); + + regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_DREQ_A_REG, +- BCM2835_I2S_TX_PANIC(0x10) +- | BCM2835_I2S_RX_PANIC(0x30) +- | BCM2835_I2S_TX(0x30) +- | BCM2835_I2S_RX(0x20), 0xffffffff); ++ BCM2835_I2S_TX_PANIC(0x7f) ++ | BCM2835_I2S_RX_PANIC(0x7f) ++ | BCM2835_I2S_TX(0x7f) ++ | BCM2835_I2S_RX(0x7f), ++ BCM2835_I2S_TX_PANIC(0x10) ++ | BCM2835_I2S_RX_PANIC(0x30) ++ | BCM2835_I2S_TX(0x20) ++ | BCM2835_I2S_RX(0x20)); + + /* Clear FIFOs */ + bcm2835_i2s_clear_fifos(dev, true, true); |