You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
1.8 KiB
Diff
55 lines
1.8 KiB
Diff
From b10789f9366de21dc44df087c4e65aa4a56a1dd9 Mon Sep 17 00:00:00 2001
|
|
From: Matthias Reichl <hias@horus.com>
|
|
Date: Sun, 11 Oct 2015 15:25:51 +0200
|
|
Subject: [PATCH 016/304] 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;
|