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authorBen Zhang <benzh@chromium.org>2014-11-17 17:21:09 -0800
committerPatrick Georgi <pgeorgi@google.com>2015-04-04 12:40:26 +0200
commit573429b09dafa94dac4e1c2b0d9ed33d64676963 (patch)
treebff30eb05909adc401dc3d39d8c1b01f53b09bd9
parentf208905fda0784111b494771f2c60d76eefebdc7 (diff)
downloadcoreboot-573429b09dafa94dac4e1c2b0d9ed33d64676963.tar.xz
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 <reinauer@chromium.org> Original-Commit-Id: b9ba4597515b2fbcc72fa22e296357c454175648 Original-Change-Id: I09acdf47bab4f641981491a84197de234918435e Original-Signed-off-by: Ben Zhang <benzh@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/230344 Original-Reviewed-by: Dylan Reid <dgreid@chromium.org> Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: http://review.coreboot.org/9277 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
-rw-r--r--src/mainboard/google/samus/acpi/mainboard.asl1
1 files changed, 1 insertions, 0 deletions
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 */