2016-12-02 10:50:26 +00:00
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From e8e6b5aae45b269c2fcc14159894901514961161 Mon Sep 17 00:00:00 2001
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2016-01-17 10:42:23 +00:00
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From: Matthias Reichl <hias@horus.com>
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Date: Sun, 11 Oct 2015 15:55:21 +0200
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] bcm2835-i2s: Enable MMAP support via a DT property
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2016-01-17 10:42:23 +00:00
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Code ported from bcm2708-i2s driver in Raspberry Pi tree.
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RPi commit 7ee829fd77a30127db5d0b3c7d79b8718166e568 ("bcm2708-i2s:
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Enable MMAP support via a DT property and overlay")
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The i2s driver used to claim to support MMAP, but that feature was disabled
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when some problems were found. Add the ability to enable this feature
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through Device Tree, using the i2s-mmap overlay.
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See: #1004
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Signed-off-by: Matthias Reichl <hias@horus.com>
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---
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sound/soc/bcm/bcm2835-i2s.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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--- a/sound/soc/bcm/bcm2835-i2s.c
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+++ b/sound/soc/bcm/bcm2835-i2s.c
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@@ -799,7 +799,7 @@ static const struct snd_soc_component_dr
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.name = "bcm2835-i2s-comp",
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};
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-static const struct snd_pcm_hardware bcm2835_pcm_hardware = {
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+static struct snd_pcm_hardware bcm2835_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_JOINT_DUPLEX,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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@@ -835,6 +835,11 @@ static int bcm2835_i2s_probe(struct plat
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}
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dma_reg_base = be32_to_cpup(addr);
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+ if (of_property_read_bool(pdev->dev.of_node, "brcm,enable-mmap"))
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+ bcm2835_pcm_hardware.info |=
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+ SNDRV_PCM_INFO_MMAP |
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+ SNDRV_PCM_INFO_MMAP_VALID;
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+
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/* Request both ioareas */
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for (i = 0; i <= 1; i++) {
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void __iomem *base;
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