[alsa-devel] [PATCH] ASoC: fsl-ssi: fix SDMA starvation
timur at tabi.org
Wed Nov 13 14:10:49 CET 2013
Markus Pargmann wrote:
>> >Can you change the code so that the interrupts are enabled only on
>> >i.MX? On PowerPC, the interrupts are used only for debugging.
> Why is this necessary? The interrupts were enabled for all
> architectures before.
My concern is with these lines:
write_ssi_mask(&ssi->sier, 0, CCSR_SSI_SIER_TDMAE);
write_ssi_mask(&ssi->sier, CCSR_SSI_SIER_TDMAE, 0);
This toggles the TDMAE interrupt on PowerPC, which I believe is VITAL to
making it work. The SSI and the DMA controller talk to each other
automatically, and if I'm reading the documentation correctly, that
communication depends on TDMAE and RDMAE.
More information about the Alsa-devel