[alsa-devel] DW-DMA: Probe failures on broadwell

[Andy Shevchenko]

On Wed, Jul 10, 2019 at 02:24:48PM -0700, Curtis Malainey wrote:
> On Wed, Jul 10, 2019 at 9:43 AM Andy Shevchenko
> <andriy.shevchenko at linux.intel.com> wrote:
> > On Tue, Jul 09, 2019 at 12:27:49PM -0700, Curtis Malainey wrote:

> > > Thanks for the information, we are running a 4.14 kernel so we don't
> > > have the idma32 driver, I will see if I can backport it and report
> > > back if the fix works.
> >
> > Driver is supporting iDMA 32-bit in v4.14 AFAICS.
> > The missed stuff is a split and some fixes here and there.
> > Here is the list of patches I have in a range v4.14..v5.2
> > (I deliberately dropped the insignificant ones)
> >
> > 934891b0a16c dmaengine: dw: Don't pollute CTL_LO on iDMA 32-bit
> > 91f0ff883e9a dmaengine: dw: Reset DRAIN bit when resume the channel
> > 69da8be90d5e dmaengine: dw: Split DW and iDMA 32-bit operations
> > 87fe9ae84d7b dmaengine: dw: Add missed multi-block support for iDMA 32-bit
> > ffe843b18211 dmaengine: dw: Fix FIFO size for Intel Merrifield
> > 7b0c03ecc42f dmaengine: dw-dmac: implement dma protection control setting
> >
> > For me sounds like fairly easy to backport.
> >
> I got the code integrated, and ran some tests. The test device
> regularly hits a BUG_ON in the dw/core.c, debug is turned on in dw
> core

I see. We need ASoC guys to shed a light here. I don't know that part at all.

Only last suggestion I have is to try remove multi-block setting from the
platform data (it will be emulated in software if needed). But I don't believe
the DMA for audio has no such feature enabled.

> We have only been able to consistently reproduce the DMA boot issue on
> our original code consistently on 1 device and sporadically on another
> handful of devices.
> When the device did finally booted after 2-3 device crashes the device
> failed to load the DSP.

Yeah, it has something to do with this firmware loader code...

> [    3.709573] sst-acpi INT3438:00: DesignWare DMA Controller, 8 channels
> [    3.959027] haswell-pcm-audio haswell-pcm-audio: error: audio DSP
> boot timeout IPCD 0x0 IPCX 0x0
> [    3.970336] bdw-rt5677 bdw-rt5677: ASoC: failed to init link System PCM

-- 
With Best Regards,
Andy Shevchenko