openwrt/target/linux/brcm2708/patches-4.4/0019-bcm2835-i2s-Enable-MMAP-support-via-a-DT-property.patch
Felix Fietkau 4224b52c3a brcm2708: add linux 4.4 support
- random-bcm2708 and spi-bcm2708 have been removed.
- sound-soc-bcm2708-i2s has been upstreamed as sound-soc-bcm2835-i2s.

Let's keep linux 4.1 for a while, since linux 4.4 appears to have some issues
with multicast traffic on RPi ethernet:
https://gist.github.com/Noltari/5b1cfdecce5ed4bc08fd

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 48266
2016-01-17 10:42:23 +00:00

45 lines
1.5 KiB
Diff

From 61f155e164c5dbfa5cec9a099e4aa802c2155423 Mon Sep 17 00:00:00 2001
From: Matthias Reichl <hias@horus.com>
Date: Sun, 11 Oct 2015 15:55:21 +0200
Subject: [PATCH 019/127] bcm2835-i2s: Enable MMAP support via a DT property
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;