102 lines
2.9 KiB
Diff
102 lines
2.9 KiB
Diff
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From 3eae00b73609f4e5a19260bfa4ca9021f295c0af Mon Sep 17 00:00:00 2001
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From: Gordon Hollingworth <gordon@holliweb.co.uk>
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Date: Fri, 2 May 2014 16:13:59 +0100
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Subject: [PATCH 53/54] Move GPIO setup to hw_params.
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This is used to stop the I2S driver from breaking
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the GPIO setup for other uses of the PCM interface
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---
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sound/soc/bcm/bcm2708-i2s.c | 55 +++++++++++++++++++++++----------------------
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1 file changed, 28 insertions(+), 27 deletions(-)
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diff --git a/sound/soc/bcm/bcm2708-i2s.c b/sound/soc/bcm/bcm2708-i2s.c
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index b25e158..9976571 100644
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--- a/sound/soc/bcm/bcm2708-i2s.c
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+++ b/sound/soc/bcm/bcm2708-i2s.c
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@@ -305,6 +305,31 @@ static int bcm2708_i2s_set_dai_bclk_ratio(struct snd_soc_dai *dai,
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return 0;
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}
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+
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+static void bcm2708_i2s_setup_gpio(void)
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+{
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+ /*
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+ * This is the common way to handle the GPIO pins for
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+ * the Raspberry Pi.
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+ * TODO Better way would be to handle
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+ * this in the device tree!
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+ */
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+#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
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+#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3))
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+
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+ unsigned int *gpio;
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+ int pin;
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+ gpio = ioremap(GPIO_BASE, SZ_16K);
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+
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+ /* SPI is on GPIO 7..11 */
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+ for (pin = 28; pin <= 31; pin++) {
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+ INP_GPIO(pin); /* set mode to GPIO input first */
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+ SET_GPIO_ALT(pin, 2); /* set mode to ALT 0 */
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+ }
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+#undef INP_GPIO
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+#undef SET_GPIO_ALT
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+}
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+
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static int bcm2708_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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@@ -334,6 +359,9 @@ static int bcm2708_i2s_hw_params(struct snd_pcm_substream *substream,
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if (csreg & (BCM2708_I2S_TXON | BCM2708_I2S_RXON))
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return 0;
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+
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+ bcm2708_i2s_setup_gpio();
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+
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/*
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* Adjust the data length according to the format.
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* We prefill the half frame length with an integer
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@@ -790,31 +818,6 @@ static const struct snd_soc_component_driver bcm2708_i2s_component = {
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.name = "bcm2708-i2s-comp",
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};
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-
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-static void bcm2708_i2s_setup_gpio(void)
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-{
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- /*
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- * This is the common way to handle the GPIO pins for
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- * the Raspberry Pi.
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- * TODO Better way would be to handle
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- * this in the device tree!
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- */
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-#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
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-#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3))
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-
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- unsigned int *gpio;
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- int pin;
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- gpio = ioremap(GPIO_BASE, SZ_16K);
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-
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- /* SPI is on GPIO 7..11 */
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- for (pin = 28; pin <= 31; pin++) {
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- INP_GPIO(pin); /* set mode to GPIO input first */
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- SET_GPIO_ALT(pin, 2); /* set mode to ALT 0 */
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- }
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-#undef INP_GPIO
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-#undef SET_GPIO_ALT
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-}
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-
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static const struct snd_pcm_hardware bcm2708_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_JOINT_DUPLEX,
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@@ -865,8 +868,6 @@ static int bcm2708_i2s_probe(struct platform_device *pdev)
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if (IS_ERR(dev))
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return PTR_ERR(dev);
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- bcm2708_i2s_setup_gpio();
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-
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dev->i2s_regmap = regmap[0];
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dev->clk_regmap = regmap[1];
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--
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1.9.1
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