On Fri, May 28, 2010 at 01:27:12PM +0100, Mark Brown wrote: > On Fri, May 28, 2010 at 12:06:25PM +1000, Stuart Longland wrote: > > > I have a userspace application that mmaps the registers for SSI2 and > > AUDMUX, and sets this up, so no big deal ... the clock it receives is > > about 12.1MHz (12.093MHz according to the frequency counter here). > > In production this should be done in-kernel. Indeed... I spent some of yesterday afternoon doing exactly this... which involved some hacking in arch/arm/mach-mx2/clocks_imx27.c... and a _very_ ugly hack to get at the SSI2 registers in my machine driver. It works, but with a few bugs, and will need a big cleanup before I can even consider putting it in mainline. > > When I try to play audio; the AUDMUX configuration is as follows: > > > Port: imx-ssi.0 > > Raw: cb205000 > > TxFS output from SSI4, TxClk output from SSI4 > > Port is symmetric > > Data received from SSI4 > > > Port: SSI4 > > Raw: 00001000 > > TxFS input, TxClk input > > Port is symmetric > > Data received from imx-ssi.0 > > This appears reasonable at first glance. > > > I'll have a look at the Eukrea CPUIMX27 and baseboard SoC support in a > > moment, since it looks very similar to what we're doing (in that it's a > > TI I²S CODEC hooked to an i.MX27 on SSI4) ... this might reveal clues > > as to what I'm doing wrong. > > Have you also checked the pin mux configuration for the i.MX? I'm not confident on how this is configured; but I have in an array; tx27_pins[] (defined in arch/arm/mach-mx2/mach-tx27.c): /* SSI3 */ PC28_PF_SSI3_FS, PC29_PF_SSI3_RXD, PC30_PF_SSI3_TXD, PC31_PF_SSI3_CLK, /* SSI4 */ PC16_PF_SSI4_FS, PC17_PF_SSI4_RXD, PC18_PF_SSI4_TXD, PC19_PF_SSI4_CLK, ... which is later set up in tx27_board_init(): mxc_gpio_setup_multiple_pins(tx27_pins, ARRAY_SIZE(tx27_pins), "tx27"); This is what I've seen done on other boards (my mach-tx27.c is based on mach-mx27ads.c). Regards, -- Stuart Longland (aka Redhatter, VK4MSL) .'''. Gentoo Linux/MIPS Cobalt and Docs Developer '.'` : . . . . . . . . . . . . . . . . . . . . . . .'.' http://dev.gentoo.org/~redhatter :.' I haven't lost my mind... ...it's backed up on a tape somewhere. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
