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authorBen Zhang <benzh@chromium.org>2014-12-10 17:44:18 -0800
committerStefan Reinauer <stefan.reinauer@coreboot.org>2015-04-10 20:21:34 +0200
commitb7f328f6a2a9985a66f6df603e46cda531f933c4 (patch)
treeb5f89c2f7ed4bdbc694a019b567a5bc0b4a7d929
parent99e952d480ec9c1a874556f3b3681c6342c29f4b (diff)
downloadcoreboot-b7f328f6a2a9985a66f6df603e46cda531f933c4.tar.xz
samus: Use codec internal 1.8V as DACREF source
This is needed for audio playback after we disconnect PP1800_CODEC from DACREF to avoid noise coupled on PP1800_CODEC, which makes recording noisy. For recording, DACREF comes from mic vref pump voltage. For playback, DACREF comes from internal 1.8V. BUG=chrome-os-partner:32953 BRANCH=samus TEST=Set MICBIAS to 2.970V on Samus, playback/recording is clean Change-Id: I65fb6dbfab54c7c4de6496fd4a0d666baead28ec Signed-off-by: Stefan Reinauer <reinauer@chromium.org> Original-Commit-Id: 3e62a61f6cf6042f6d653a827698b55ac86e2d2b Original-Change-Id: I27430691e469dd7f4056d99438ce080062b58b9a Original-Signed-off-by: Ben Zhang <benzh@chromium.org> Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/241179 Reviewed-on: http://review.coreboot.org/9500 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
-rw-r--r--src/mainboard/google/samus/acpi/mainboard.asl2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mainboard/google/samus/acpi/mainboard.asl b/src/mainboard/google/samus/acpi/mainboard.asl
index 4d905f5c90..918e56580b 100644
--- a/src/mainboard/google/samus/acpi/mainboard.asl
+++ b/src/mainboard/google/samus/acpi/mainboard.asl
@@ -170,6 +170,7 @@ Scope (\_SB.PCI0.I2C0)
Name (WAKE, 45) /* DSP_INT (use as codec wake) */
Name (MB1, 1) /* MICBIAS1 = 2.970V */
+ Name (DACR, 1) /* Use codec internal 1.8V as DACREF source */
Name (DCLK, 0) /* RT5677_DMIC_CLK1 */
Name (PCLK, 1) /* RT5677_PDM_CLK_DIV2 (~3MHz) */
Name (IN1, 1) /* IN1 differential */
@@ -187,6 +188,7 @@ Scope (\_SB.PCI0.I2C0)
ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () { "realtek,micbias1", 1 },
+ Package () { "realtek,internal-dacref-en", 1 },
Package () { "realtek,in1-differential", 1 },
Package () { "realtek,in2-differential", 0 },
Package () { "realtek,lout1-differential", 1 },