From 573429b09dafa94dac4e1c2b0d9ed33d64676963 Mon Sep 17 00:00:00 2001 From: Ben Zhang Date: Mon, 17 Nov 2014 17:21:09 -0800 Subject: samus: Set codec PDM clock output to 3MHz Currently the rt5677 codec outputs 6MHz PDM clock which is out-of-spec for the speaker amp SSM2537. The amp's GAIN_FS pin is pulled down to PGND with a 47k resistor, so the expected PDM clock is 64*FS (~3MHz) according to its datasheet. The corresponding kernel patch that adds the PDM clock config option is https://chromium-review.googlesource.com/#/c/230303/ BUG=chrome-os-partner:33303 BRANCH=samus TEST=flash coreboot with this patch and see PDM CLK went from 6MHz to 3MHz on samus with a scope. Change-Id: Icf2c61930175bede1ee8ebc2b0fb17c2938b806c Signed-off-by: Stefan Reinauer Original-Commit-Id: b9ba4597515b2fbcc72fa22e296357c454175648 Original-Change-Id: I09acdf47bab4f641981491a84197de234918435e Original-Signed-off-by: Ben Zhang Original-Reviewed-on: https://chromium-review.googlesource.com/230344 Original-Reviewed-by: Dylan Reid Original-Reviewed-by: Duncan Laurie Reviewed-on: http://review.coreboot.org/9277 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi --- src/mainboard/google/samus/acpi/mainboard.asl | 1 + 1 file changed, 1 insertion(+) (limited to 'src/mainboard') diff --git a/src/mainboard/google/samus/acpi/mainboard.asl b/src/mainboard/google/samus/acpi/mainboard.asl index 39797e5ce1..2b6cea0b0e 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 (DCLK, 0) /* RT5677_DMIC_CLK1 */ + Name (PCLK, 1) /* RT5677_PDM_CLK_DIV2 (~3MHz) */ Name (IN1, 1) /* IN1 differential */ Name (IN2, 0) /* IN2 not differential */ Name (OUT1, 1) /* LOUT1 differential */ -- cgit v1.2.3