diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0016-bcm2835-i2s-setup-clock-only-if-CPU-is-clock-master.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0016-bcm2835-i2s-setup-clock-only-if-CPU-is-clock-master.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0016-bcm2835-i2s-setup-clock-only-if-CPU-is-clock-master.patch b/target/linux/brcm2708/patches-4.4/0016-bcm2835-i2s-setup-clock-only-if-CPU-is-clock-master.patch new file mode 100644 index 0000000..e096656 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0016-bcm2835-i2s-setup-clock-only-if-CPU-is-clock-master.patch @@ -0,0 +1,54 @@ +From fce554c6331b34458db54722cb06eb517a32b305 Mon Sep 17 00:00:00 2001 +From: Matthias Reichl <hias@horus.com> +Date: Sun, 11 Oct 2015 15:25:51 +0200 +Subject: [PATCH 016/127] bcm2835-i2s: setup clock only if CPU is clock master + +Code ported from bcm2708-i2s driver in Raspberry Pi tree. + +RPi commit c14827ecdaa36607f6110f9ce8df96e698672191 ("bcm2708: Allow +option card devices to be configured via DT") + +Original work by Zoltan Szenczi, committed to RPi tree by +Phil Elwell. + +Signed-off-by: Matthias Reichl <hias@horus.com> +--- + sound/soc/bcm/bcm2835-i2s.c | 28 +++++++++++++++++++--------- + 1 file changed, 19 insertions(+), 9 deletions(-) + +--- a/sound/soc/bcm/bcm2835-i2s.c ++++ b/sound/soc/bcm/bcm2835-i2s.c +@@ -411,15 +411,25 @@ static int bcm2835_i2s_hw_params(struct + divf = dividend & BCM2835_CLK_DIVF_MASK; + } + +- /* Set clock divider */ +- regmap_write(dev->clk_regmap, BCM2835_CLK_PCMDIV_REG, BCM2835_CLK_PASSWD +- | BCM2835_CLK_DIVI(divi) +- | BCM2835_CLK_DIVF(divf)); ++ /* Clock should only be set up here if CPU is clock master */ ++ switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) { ++ case SND_SOC_DAIFMT_CBS_CFS: ++ case SND_SOC_DAIFMT_CBS_CFM: ++ /* Set clock divider */ ++ regmap_write(dev->clk_regmap, BCM2835_CLK_PCMDIV_REG, ++ BCM2835_CLK_PASSWD ++ | BCM2835_CLK_DIVI(divi) ++ | BCM2835_CLK_DIVF(divf)); + +- /* Setup clock, but don't start it yet */ +- regmap_write(dev->clk_regmap, BCM2835_CLK_PCMCTL_REG, BCM2835_CLK_PASSWD +- | BCM2835_CLK_MASH(mash) +- | BCM2835_CLK_SRC(clk_src)); ++ /* Setup clock, but don't start it yet */ ++ regmap_write(dev->clk_regmap, BCM2835_CLK_PCMCTL_REG, ++ BCM2835_CLK_PASSWD ++ | BCM2835_CLK_MASH(mash) ++ | BCM2835_CLK_SRC(clk_src)); ++ break; ++ default: ++ break; ++ } + + /* Setup the frame format */ + format = BCM2835_I2S_CHEN; |