brcm2708: add linux 4.9 support

Patches from Raspberry Pi repo:
https://github.com/raspberrypi/linux/commits/rpi-4.9.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.9/0132-Revert-bcm2835-i2s-Changes-for-allowing-asymmetric-s.patch b/target/linux/brcm2708/patches-4.9/0132-Revert-bcm2835-i2s-Changes-for-allowing-asymmetric-s.patch
new file mode 100644
index 0000000000..189b288898
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.9/0132-Revert-bcm2835-i2s-Changes-for-allowing-asymmetric-s.patch
@@ -0,0 +1,90 @@
+From db51b292d97ecb021831ed380ce4e1152b1bd235 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Mon, 16 Jan 2017 21:02:26 +0000
+Subject: [PATCH] Revert "bcm2835-i2s: Changes for allowing asymmetric sample
+ formats."
+
+This reverts commit f5a6236a32e82068122301d246a94ca755d61704.
+
+See: https://github.com/raspberrypi/linux/issues/1799
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ 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
+@@ -237,9 +237,7 @@ 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;
+ 	uint32_t csreg;
+-	bool packed;
+ 
+ 	/*
+ 	 * If a stream is already enabled,
+@@ -322,46 +320,26 @@ 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);