Messages in this thread | | | Date | Thu, 17 Feb 2011 16:58:09 -0800 | Subject | Re: [RFC PATCH 2/3] ARM: gic: Use cpu pm notifiers to save gic state | From | Colin Cross <> |
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On Thu, Feb 10, 2011 at 1:31 PM, Colin Cross <ccross@android.com> wrote:
<snip>
> +#ifdef CONFIG_PM > + u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)]; > + u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)]; > + u32 saved_spi_pri[DIV_ROUND_UP(1020, 4)]; > + u32 saved_spi_target[DIV_ROUND_UP(1020, 4)]; > + u32 __percpu *saved_ppi_enable; > + u32 __percpu *saved_ppi_conf; > + u32 __percpu *saved_ppi_pri; > +#endif The #ifdef CONFIG_PM breaks building !CONFIG_PM, and this should depend on CONFIG_CPU_IDLE, not CONFIG_PM.
> +static void gic_cpu_save(unsigned int gic_nr) > +{ > + int i; > + u32 *ptr; > + void __iomem *dist_base; > + void __iomem *cpu_base; > + > + if (gic_nr >= MAX_GIC_NR) > + BUG(); > + > + dist_base = gic_data[gic_nr].dist_base; > + cpu_base = gic_data[gic_nr].cpu_base; > + > + if (!dist_base || !cpu_base) > + return; > + > + ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable); > + for (i = 0; i < DIV_ROUND_UP(32, 32); i++) > + ptr[i] = readl(dist_base + GIC_DIST_ENABLE_SET + i * 4); > + > + ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf); > + for (i = 0; i < DIV_ROUND_UP(32, 16); i++) > + ptr[i] = readl(dist_base + GIC_DIST_CONFIG + i * 4); > + > + ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_pri); > + for (i = 0; i < DIV_ROUND_UP(32, 4); i++) > + ptr[i] = readl(dist_base + GIC_DIST_PRI + i * 4); > + > + writel(0, cpu_base + GIC_CPU_CTRL); > +} Disabling the GIC cpu interface here prevents SGIs from waking the CPU from WFI. On Tegra2, it is useful to be able to go to WFI, and then either back to normal or into reset depending on the state of the other CPU. Is it safe to leave the GIC CPU control on when going to reset? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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