Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9277
-gerrit
commit 8d7f451e5f44173f35764445ea0f5c1666a15d2d Author: Ben Zhang benzh@chromium.org Date: Mon Nov 17 17:21:09 2014 -0800
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 --- src/mainboard/google/samus/acpi/mainboard.asl | 1 + 1 file changed, 1 insertion(+)
diff --git a/src/mainboard/google/samus/acpi/mainboard.asl b/src/mainboard/google/samus/acpi/mainboard.asl index 39797e5..2b6cea0 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 */