On Mon, Nov 24, 2014 at 6:46 PM, Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> wrote: > [adding Tushar Behera and Doug Anderson to cc list] > > Hello, > > On 11/24/2014 12:12 PM, Krzysztof Kozlowski wrote: >> On pon, 2014-11-24 at 12:07 +0100, Javier Martinez Canillas wrote: >>> Hello Krzysztof, >>> >>> > It seems that mau_epll has to be enabled... or something is wrong with >>> > clock hierarchy. >>> > >>> >>> Another strange thing is that the problem does not happen for some people >>> using the same board, kernel and config options. For example Vivek and Ajay >>> report that they can't reproduce the issue on a Peach Pi using next-20141121 >>> and exynos_defconfig without using clk_ignore_unused. >> >> Maybe they have different bootloader which messes here by enabling some >> clock? >> >> Anyway it is reproducible on at least some Arndale Octa (Kevin's and >> mine) and Peach Pi boards (yours). >> > > This issue started to look extremely familiar to me so I searched in > my mail inbox and found that the same problem was previously reported > by Kevin a couple of months ago [0] and Tushar provided a fix [1]. > > I tested linux-next + [1] and that indeed fixes the hang on Peach. > > To save you a click, the problem as explained by Tushar is that the > AUDSS mux has two parents: XXTI crystal and MAU_EPLL clock. But when > the output of AUDSS mux is gated, no operations can be made on the > clocks provided by MAU block. For some reason the kernel just oops > so it seems to be a H/W errata? > > Mike was not fond about the solution proposed in [1] but something > along those lines would be needed maybe Tushar can comment on that. > > Vivek and Ajay, > > As explained in [0], you are not facing this issue because your RW > U-Boot seems to predate when audio support was enabled by default. We are using one from Google's build-bot: "U-Boot 2013.04-g1eced1c (Nov 20 2014 - 21:27:46) for Peach" > > Can you try executing "sound init" in the U-Boot prompt and see if > that triggers the hang for you? But yes, doing *sound init* do trigger the hang. > > Best regards, > Javier > > [0]: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-June/262259.html > [1]: http://www.spinics.net/lists/arm-kernel/msg337970.html -- Best Regards Vivek Gautam Samsung R&D Institute, Bangalore India -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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