Quoting Krzysztof Kozlowski (2014-12-16 00:20:15) > On pon, 2014-12-15 at 14:26 -0800, Kevin Hilman wrote: > > Kevin Hilman <khilman@xxxxxxxxxx> writes: > > > > > Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx> writes: > > > > > >> On 09/12/14 13:59, Krzysztof Kozlowski wrote: > > >>> On pią, 2014-12-05 at 15:15 +0100, Krzysztof Kozlowski wrote: > > >>>> > Audio subsystem clocks are located in separate block. On Exynos 5420 if > > >>>> > clock for this block (from main clock domain) 'mau_epll' is gated then > > >>>> > any read or write to audss registers will block. > > >>>> > > > >>>> > This kind of boot hang was observed on Arndale Octa and Peach Pi/Pit > > >>>> > after introducing runtime PM to pl330 DMA driver. After that commit the > > >>>> > 'mau_epll' was gated, because the "amba" clock was disabled and there > > >>>> > were no more users of mau_epll. > > >>>> > > > >>>> > The system hang on one of steps: > > >>>> > 1. Disabling unused clocks from audss block. > > >>>> > 2. During audss GPIO setup (just before probing i2s0 because > > >>>> > samsung_pinmux_setup() tried to access memory from audss block which was > > >>>> > gated. > > >>>> > > > >>>> > Add a workaround for this by enabling the 'mau_epll' clock in probe. > > >>>> > > > >>>> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> > > >>>> > --- > > >>>> > drivers/clk/samsung/clk-exynos-audss.c | 29 ++++++++++++++++++++++++++++- > > >>>> > 1 file changed, 28 insertions(+), 1 deletion(-) > > >>> > > >>> Sorry for pinging so quick but merge window is open and it looks like > > >>> booting Exynos542x boards will be broken (because pl330 will no longer > > >>> hold adma clock enabled so whole audss domain will be gated). > > >>> > > >>> This is a non-intrusive workaround for that issue, as wanted by > > >>> Sylwester: > > >>> https://lkml.org/lkml/2014/12/5/223 > > >>> > > >>> Any comments on this? > > >> > > >> The patch looks OK to me, it would be good though if someone else > > >> has confirmed it fixes the bug. I don't have any clock patches queued > > >> at the moment. Perhaps you could apply it directly, Mike ? > > > > > > I confirm it fixes the boot hang in linux-next (next-20141210) on my > > > exynos5800-peach-pi and exynos5420-arndale-octa. Tested both > > > exynos_defconfig and multi_v7_defconfig. > > > > > > Tested-by: Kevin Hilman <khilman@xxxxxxxxxx> > > > > What's the status of this patch? linux-next is still broken for several > > Exynos5 platforms without this fix. > > I believe not only next is broken but also current mainline because > runtime PM for pl330 was merged yesterday... > > The patch received two tested-bys (Kevin's and Javier's) and Sylwester's > ack. > > Mike, could you pick the patch and send it to Linus after rc1? Will do. Regards, Mike > > Best regards, > Krzysztof > -- 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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