2016-03-08 18:11:49 +00:00
|
|
|
From c9e2eeee4889f965a29744718bbff2de409ac649 Mon Sep 17 00:00:00 2001
|
2016-01-17 10:42:23 +00:00
|
|
|
From: Matthias Reichl <hias@horus.com>
|
|
|
|
|
Date: Sun, 11 Oct 2015 15:55:21 +0200
|
2016-03-08 18:11:49 +00:00
|
|
|
Subject: [PATCH 019/170] bcm2835-i2s: Enable MMAP support via a DT property
|
2016-01-17 10:42:23 +00:00
|
|
|
|
|
|
|
|
Code ported from bcm2708-i2s driver in Raspberry Pi tree.
|
|
|
|
|
|
|
|
|
|
RPi commit 7ee829fd77a30127db5d0b3c7d79b8718166e568 ("bcm2708-i2s:
|
|
|
|
|
Enable MMAP support via a DT property and overlay")
|
|
|
|
|
|
|
|
|
|
The i2s driver used to claim to support MMAP, but that feature was disabled
|
|
|
|
|
when some problems were found. Add the ability to enable this feature
|
|
|
|
|
through Device Tree, using the i2s-mmap overlay.
|
|
|
|
|
|
|
|
|
|
See: #1004
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Matthias Reichl <hias@horus.com>
|
|
|
|
|
---
|
|
|
|
|
sound/soc/bcm/bcm2835-i2s.c | 7 ++++++-
|
|
|
|
|
1 file changed, 6 insertions(+), 1 deletion(-)
|
|
|
|
|
|
|
|
|
|
--- a/sound/soc/bcm/bcm2835-i2s.c
|
|
|
|
|
+++ b/sound/soc/bcm/bcm2835-i2s.c
|
|
|
|
|
@@ -799,7 +799,7 @@ static const struct snd_soc_component_dr
|
|
|
|
|
.name = "bcm2835-i2s-comp",
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
-static const struct snd_pcm_hardware bcm2835_pcm_hardware = {
|
|
|
|
|
+static struct snd_pcm_hardware bcm2835_pcm_hardware = {
|
|
|
|
|
.info = SNDRV_PCM_INFO_INTERLEAVED |
|
|
|
|
|
SNDRV_PCM_INFO_JOINT_DUPLEX,
|
|
|
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE |
|
|
|
|
|
@@ -835,6 +835,11 @@ static int bcm2835_i2s_probe(struct plat
|
|
|
|
|
}
|
|
|
|
|
dma_reg_base = be32_to_cpup(addr);
|
|
|
|
|
|
|
|
|
|
+ if (of_property_read_bool(pdev->dev.of_node, "brcm,enable-mmap"))
|
|
|
|
|
+ bcm2835_pcm_hardware.info |=
|
|
|
|
|
+ SNDRV_PCM_INFO_MMAP |
|
|
|
|
|
+ SNDRV_PCM_INFO_MMAP_VALID;
|
|
|
|
|
+
|
|
|
|
|
/* Request both ioareas */
|
|
|
|
|
for (i = 0; i <= 1; i++) {
|
|
|
|
|
void __iomem *base;
|
