Hi
Il 17/nov/2014 08:35 "Craig McQueen" craig.mcqueen@beamcommunications.com ha scritto:
On 14/11/14 13:04, Michael Trimarchi wrote:
Hi
Il 14/nov/2014 09:58 "Craig McQueen" <
craig.mcqueen@beamcommunications.com> ha scritto:
On 14/11/14 12:45, Michael Trimarchi wrote:
Hi
Il 14/nov/2014 09:44 "Craig McQueen" <
craig.mcqueen@beamcommunications.com> ha scritto:
I'm testing the 3.14.19 kernel for i.MX28 EVK, which has an
SGTL5000 CODEC. I've also tested on the 3.18-rc4 kernel and confirmed this issue still occurs.
Are you using it in master or slave mode?
Try to change the pin mux of data line in order to be hz in idle mode
and add a small pull down resistor. Can you check if the dataline is up when clocks go off?
Is it the I2S_DIN pin you're referring to?
This is the Freescale i.MX28 EVK we're talking about, so it's best to
have a software fix that works on the stock EVK hardware. I'm checking the schematics and I don't see a pull-down. The following is in the imx28.dtsi device tree source:
saif0_pins_b: saif0@1 { reg = <1>; fsl,pinmux-ids = < MX28_PAD_SAIF0_LRCLK__SAIF0_LRCLK MX28_PAD_SAIF0_BITCLK__SAIF0_BITCLK MX28_PAD_SAIF0_SDATA0__SAIF0_SDATA0 >; fsl,drive-strength = <MXS_DRIVE_12mA>; fsl,voltage = <MXS_VOLTAGE_HIGH>; fsl,pull-up = <MXS_PULL_ENABLE>; };However on the i.MX28 I don't think the SAIF0_SDATA0 pin actually has a
pull-up (only a few pins do).
Anyway, I will look into that soon.
I think that some patch was submitted for this pop last week
Michael
-- Craig McQueen