Hi Laurent, Magnus, On Wed, Dec 17, 2014 at 9:30 AM, Geert Uytterhoeven <ge...@linux-m68k.org> wrote: > On Wed, Dec 17, 2014 at 3:08 AM, Laurent Pinchart > <laurent.pinch...@ideasonboard.com> wrote: >>> > Kzm9g-reference still hangs at "Calibrating local timer..." (it did work >>> > at some point in the past). >> >> kzm9g-reference boots for me with kzm9g_defconfig on Simon's devel branch >> with > > OK. > > I had expected the breakage to be something in my tree, either an issue in > a -next branch I'm using, an interaction with the CCF patches or so, or a > config issue (e.g. CONFIG_CPU_IDLE became broken lately if the TWD is > not in DT).
Kzm9g-reference hangs at "Calibrating local timer..." because I added the TWD to sh73a0.dtsi (http://www.spinics.net/lists/arm-kernel/msg383413.html). As twd_get_clock() does if (np) twd_clk = of_clk_get(np, 0); else twd_clk = clk_get_sys("smp_twd", NULL); it's not DT-without-CCF proof, and kzm9g-reference cannot get its clock :-( So the TWD node should be in sh73a0-kzm9g-multiplatform.dts, and we need more dts files instead of less... Note that I added the TWD node to DT to fix a hang on kzm9g-multiplatform with CONFIG_CPU_IDLE=y (recently introduced "regression" in core code) after: DMA: preallocated 256 KiB pool for atomic coherent allocations On kzm9g-legacy the TWD is instantiated from C board code (machine_desc.init_time = sh73a0_earlytimer_init), so CONFIG_CPU_IDLE=y does not hang. Despite https://lkml.org/lkml/2014/12/2/339. On kzm9g-reference, the TWD is not instantiated, causing the same hang. If I instantiate the TWD from C board code there, it fails with twd: can't register interrupt 29 (-22) which looks like a symptom of https://lkml.org/lkml/2014/12/2/339 So no cookies for users of several -legacy and -reference platforms in v3.19-rc1 this Monday... Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
