brcm2708: update to latest patches from RPi foundation

[openwrt/openwrt.git] / target / linux / brcm2708 / patches-4.19 / 950-0388-staging-bcm2835-audio-Add-10ms-period-constraint.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0388-staging-bcm2835-audio-Add-10ms-period-constraint.patch b/target/linux/brcm2708/patches-4.19/950-0388-staging-bcm2835-audio-Add-10ms-period-constraint.patch
new file mode 100644 (file)
index 0000000..07e96f6
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0388-staging-bcm2835-audio-Add-10ms-period-constraint.patch
@@ -0,0 +1,33 @@
+From daa78c198ece1ec901ee565c869ee1a60a95061d Mon Sep 17 00:00:00 2001
+From: Takashi Iwai <tiwai@suse.de>
+Date: Tue, 4 Sep 2018 17:58:46 +0200
+Subject: [PATCH] staging: bcm2835-audio: Add 10ms period constraint
+
+commit 93c66acaf68b5247c3121a46a71ff6a70fc1d492 upstream.
+
+It seems that the resolution of vc04 callback is in 10 msec; i.e. the
+minimal period size is also 10 msec.
+
+This patch adds the corresponding hw constraint.
+
+Signed-off-by: Takashi Iwai <tiwai@suse.de>
+Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
+@@ -145,6 +145,11 @@ static int snd_bcm2835_playback_open_gen
+                                  SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+                                  16);
+ 
++      /* position update is in 10ms order */
++      snd_pcm_hw_constraint_minmax(runtime,
++                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
++                                   10 * 1000, UINT_MAX);
++
+       chip->alsa_stream[idx] = alsa_stream;
+ 
+       chip->opened |= (1 << idx);