brcm2708: remove linux 4.4 support

[openwrt/staging/yousong.git] / target / linux / brcm2708 / patches-4.4 / 0141-Limit-PCM512x-Digital-gain-to-0dB-by-default-with-Hi.patch

diff --git a/target/linux/brcm2708/patches-4.4/0141-Limit-PCM512x-Digital-gain-to-0dB-by-default-with-Hi.patch b/target/linux/brcm2708/patches-4.4/0141-Limit-PCM512x-Digital-gain-to-0dB-by-default-with-Hi.patch
deleted file mode 100644 (file)
index 4f63921..0000000
--- a/target/linux/brcm2708/patches-4.4/0141-Limit-PCM512x-Digital-gain-to-0dB-by-default-with-Hi.patch
+++ /dev/null
@@ -1,98 +0,0 @@
-From 98357bafa929284bbd1046556971c3d4ae9f71d9 Mon Sep 17 00:00:00 2001
-From: Digital Dreamtime <clive.messer@digitaldreamtime.co.uk>
-Date: Thu, 4 Feb 2016 20:04:00 +0000
-Subject: [PATCH] Limit PCM512x "Digital" gain to 0dB by default with HiFiBerry
- DAC+
-
-24db_digital_gain DT param can be used to specify that PCM512x
-codec "Digital" volume control should not be limited to 0dB gain,
-and if specified will allow the full 24dB gain.
----
- arch/arm/boot/dts/overlays/README                       | 17 +++++++++++++++--
- .../arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts |  6 +++++-
- sound/soc/bcm/hifiberry_dacplus.c                       | 14 ++++++++++++++
- 3 files changed, 34 insertions(+), 3 deletions(-)
-
---- a/arch/arm/boot/dts/overlays/README
-+++ b/arch/arm/boot/dts/overlays/README
-@@ -273,8 +273,21 @@ Params: <None>
- 
- Name:   hifiberry-dacplus
- Info:   Configures the HifiBerry DAC+ audio card
--Load:   dtoverlay=hifiberry-dacplus
--Params: <None>
-+Load:   dtoverlay=hifiberry-dacplus,<param>=<val>
-+Params: 24db_digital_gain       Allow gain to be applied via the PCM512x codec
-+                                Digital volume control. Enable with
-+                                "dtoverlay=hifiberry-dacplus,24db_digital_gain"
-+                                (The default behaviour is that the Digital
-+                                volume control is limited to a maximum of
-+                                0dB. ie. it can attenuate but not provide
-+                                gain. For most users, this will be desired
-+                                as it will prevent clipping. By appending
-+                                the 24dB_digital_gain parameter, the Digital
-+                                volume control will allow up to 24dB of
-+                                gain. If this parameter is enabled, it is the
-+                                responsibility of the user to ensure that
-+                                the Digital volume control is set to a value
-+                                that does not result in clipping/distortion!)
- 
- 
- Name:   hifiberry-digi
---- a/arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts
-+++ b/arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts
-@@ -17,7 +17,7 @@
- 
-       fragment@1 {
-               target = <&sound>;
--              __overlay__ {
-+              frag1: __overlay__ {
-                       compatible = "hifiberry,hifiberry-dacplus";
-                       i2s-controller = <&i2s>;
-                       status = "okay";
-@@ -47,4 +47,8 @@
-                       };
-               };
-       };
-+
-+      __overrides__ {
-+              24db_digital_gain = <&frag1>,"hifiberry,24db_digital_gain?";
-+      };
- };
---- a/sound/soc/bcm/hifiberry_dacplus.c
-+++ b/sound/soc/bcm/hifiberry_dacplus.c
-@@ -48,6 +48,7 @@ struct pcm512x_priv {
- #define CLK_48EN_RATE 24576000UL
- 
- static bool snd_rpi_hifiberry_is_dacpro;
-+static bool digital_gain_0db_limit = true;
- 
- static void snd_rpi_hifiberry_dacplus_select_clk(struct snd_soc_codec *codec,
-       int clk_id)
-@@ -167,6 +168,16 @@ static int snd_rpi_hifiberry_dacplus_ini
-       snd_soc_update_bits(codec, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02);
-       snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
- 
-+      if (digital_gain_0db_limit)
-+      {
-+              int ret;
-+              struct snd_soc_card *card = rtd->card;
-+
-+              ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
-+              if (ret < 0)
-+                      dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
-+      }
-+
-       return 0;
- }
- 
-@@ -299,6 +310,9 @@ static int snd_rpi_hifiberry_dacplus_pro
-                       dai->platform_name = NULL;
-                       dai->platform_of_node = i2s_node;
-               }
-+
-+              digital_gain_0db_limit = !of_property_read_bool(
-+                      pdev->dev.of_node, "hifiberry,24db_digital_gain");
-       }
- 
-       ret = snd_soc_register_card(&snd_rpi_hifiberry_dacplus);