topic IMX6Q SDMA issue when porting Android 7.1.1 in i.MX Processors

IMX6Q SDMA issue when porting Android 7.1.1

starying — Mon, 03 Jul 2017 10:08:28 GMT

Dear Programmers:

IMX6Q SDMA does not work, with Kernel 4.1.15, in Android 7.1.1 system. SDMA firmware name is sdma-imx6q.bin, whose version is 3.3.

Here I want to use SDMA for Audio Subsystem SSI.

PCM Stream to platform DAI mapping relation:

pcmC0D0c ---> 2028000.ssi

pcmC0D0p ---> 2028000.ssi
pcmC0D1c ---> 202c000.ssi
pcmC0D1p ---> 202c000.ssi
pcmC0D2c ---> 2030000.ssi
pcmC0D2p ---> 2030000.ssi
pcmC0D3c ---> 2024000.esai
pcmC0D3p ---> 2024000.esai

I tested pcmC0D0p device node with "tinyplay" . Testing command line is "tinyplay source.wav -D 0 -d 0"，and result is "Error playing sample". Something is wrong.

SDMA interrupt info:

284: 4 0 GPC 2 Level sdma

SDMA DTS Configuration:

sdma: sdma@020ec000 {
compatible = "fsl,imx6q-sdma", "fsl,imx35-sdma";
reg = <0x020ec000 0x4000>;
interrupts = <0 2 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_SDMA>,
   <&clks IMX6QDL_CLK_SDMA>;
clock-names = "ipg", "ahb";
#dma-cells = <3>;
fsl,sdma-ram-script-name = "imx/sdma/sdma-imx6q.bin";

status="okay";
};

SSI DTS Configuration:

ssi1: ssi@02028000 {
#sound-dai-cells = <0>;
compatible = "fsl,imx6q-ssi",
   "fsl,imx51-ssi";
reg = <0x02028000 0x4000>;
interrupts = <0 46 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_SSI1_IPG>,
   <&clks IMX6QDL_CLK_SSI1>;
clock-names = "ipg", "baud";
dmas = <&sdma 37 22 0>,
        <&sdma 38 22 0>;
dma-names = "rx", "tx";
fsl,fifo-depth = <15>;
status = "okay";
};

After a preliminary investigation, I found that during tinyplay testing, DMA call back function void imx_pcm_dma_complete(void *arg) does not occur at all, and SDMA interrupt does not increase.

If anyone knows what is going on, please tell me. Thanks a lot.

Best regards.

Re: IMX6Q SDMA issue when porting Android 7.1.1

igorpadykov — Mon, 03 Jul 2017 23:37:03 GMT

Hi Star

sdma is used on i.MX6Q Sabre SD by wm8962 with ssi2, pelase look at imx6qdl-sabresd.dtsi, imx6qdl.dtsi :
http://git.freescale.com/git/cgit.cgi/imx/linux-imx.git/tree/arch/arm/boot/dts/imx6qdl-sabresd.dtsi?h=imx_4.1.15_2.0.0_ga&id=rel_imx_4.1.15_2.0.0_ga
and use test described in sect.28.5.1 Stereo Codec Unit Test attached Linux Manual

Best regards
igor
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Re: IMX6Q SDMA issue when porting Android 7.1.1

fuchao — Wed, 05 Jul 2017 03:52:19 GMT

I have also encountered the same problem.

Use the tinplay command to play music,and result the error message.

Error Message:

   Error playing sample
   errno=5
   Mesage:I/O error

SDMA has time out in the snd_pcm_lib_write1 function.

Error log:

playback write error (DMA or IRQ trouble?)