Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9500
-gerrit
commit dfa1c81d9ac48adf46161871b7005e886dd7994f Author: Ben Zhang benzh@chromium.org Date: Wed Dec 10 17:44:18 2014 -0800
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 --- src/mainboard/google/samus/acpi/mainboard.asl | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/src/mainboard/google/samus/acpi/mainboard.asl b/src/mainboard/google/samus/acpi/mainboard.asl index 287f595..2140898 100644 --- a/src/mainboard/google/samus/acpi/mainboard.asl +++ b/src/mainboard/google/samus/acpi/mainboard.asl @@ -178,6 +178,7 @@ 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 */ @@ -195,6 +196,7 @@ 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 },