On Fri, 09 Aug 2013 01:03:05 +0200, Tomasz Figa wrote: > Hi KyongHo, > > nit: Please drop the trailing dot at the end of patch subject. > Oh. I didn't catch that. Thank you. > On Thursday 08 of August 2013 18:41:17 Cho KyongHo wrote: > > This adds support for Advance Power Management and Runtime Power > > Management. > > This patch adds support for system-wide and runtime power management. > Ok. > > Since System MMU is located in the same local power domain of its > > master H/W, System MMU must be initialized before it is working if > > its power domain was ever turned off. TLB invalidation according to > > unmapping on page tables must also be performed while power domain is > > turned on. > > > > This patch ensures that resume and runtime_resume(restore_state) > > functions in this driver is called before the calls to resume and > > runtime_resume callback functions in the drivers of master H/Ws. > > Likewise, suspend and runtime_suspend(save_state) functions in this > > driver is called after the calls to suspend and runtime_suspend in the > > drivers of master H/Ws. > > > > In order to get benefit of this support, the master H/W and its System > > MMU must resides in the same power domain in terms of Linux kernel. If > > a master H/W does not use generic I/O power domain, its driver must > > call iommu_attach_device() after its local power domain is turned on, > > iommu_detach_device before turned off. > > I don't get the point of this last paragraph. What a power domain can be > in other terms? Is there any other way to support power domains on Exynos > than generic power domains? > I just addressed the case a device driver turns off local power of its device without the help of generic I/O powerdomain. > > Signed-off-by: Cho KyongHo <pullip.cho@xxxxxxxxxxx> > > --- > > drivers/iommu/exynos-iommu.c | 235 > > +++++++++++++++++++++++++++++++++++++++++- 1 files changed, 231 > > insertions(+), 4 deletions(-) > > > > diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c > > index 9e64483..56aead9 100644 > > --- a/drivers/iommu/exynos-iommu.c > > +++ b/drivers/iommu/exynos-iommu.c > > @@ -28,6 +28,7 @@ > > #include <linux/export.h> > > #include <linux/of.h> > > #include <linux/of_platform.h> > > +#include <linux/pm_domain.h> > > #include <linux/notifier.h> > > > > #include <asm/cacheflush.h> > > @@ -186,6 +187,7 @@ struct sysmmu_drvdata { > > int activations; > > rwlock_t lock; > > struct iommu_domain *domain; > > + bool runtime_active; > > unsigned long pgtable; > > void __iomem *sfrbases[0]; > > }; > > @@ -438,7 +440,8 @@ static bool __sysmmu_disable(struct sysmmu_drvdata > > *data) data->pgtable = 0; > > data->domain = NULL; > > > > - __sysmmu_disable_nocount(data); > > + if (data->runtime_active) > > + __sysmmu_disable_nocount(data); > > > > dev_dbg(data->sysmmu, "Disabled\n"); > > } else { > > @@ -505,7 +508,8 @@ static int __sysmmu_enable(struct sysmmu_drvdata > > *data, data->pgtable = pgtable; > > data->domain = domain; > > > > - __sysmmu_enable_nocount(data); > > + if (data->runtime_active) > > + __sysmmu_enable_nocount(data); > > > > dev_dbg(data->sysmmu, "Enabled\n"); > > } else { > > @@ -609,7 +613,7 @@ static void sysmmu_tlb_invalidate_entry(struct > > device *dev, unsigned long iova) data = > > dev_get_drvdata(client->sysmmu[i]); > > > > read_lock_irqsave(&data->lock, flags); > > - if (is_sysmmu_active(data)) { > > + if (is_sysmmu_active(data) && data->runtime_active) { > > int i; > > clk_enable(data->clk_master); > > for (i = 0; i < data->nsfrs; i++) > > @@ -637,7 +641,8 @@ void exynos_sysmmu_tlb_invalidate(struct device > > *dev) data = dev_get_drvdata(client->sysmmu[i]); > > > > read_lock_irqsave(&data->lock, flags); > > - if (is_sysmmu_active(data)) { > > + if (is_sysmmu_active(data) && > > + data->runtime_active) { > > nit: The whole if condition fits into single line. Ok. > > > int i; > > for (i = 0; i < data->nsfrs; i++) { > > clk_enable(data->clk_master); > > @@ -711,6 +716,8 @@ static int __init exynos_sysmmu_probe(struct > > platform_device *pdev) } > > } > > > > + pm_runtime_enable(dev); > > + > > data->sysmmu = dev; > > > > data->clk = devm_clk_get(dev, "sysmmu"); > > @@ -736,6 +743,8 @@ static int __init exynos_sysmmu_probe(struct > > platform_device *pdev) return ret; > > } > > > > + data->runtime_active = !pm_runtime_enabled(dev); > > + > > rwlock_init(&data->lock); > > > > platform_set_drvdata(pdev, data); > > @@ -744,6 +753,34 @@ static int __init exynos_sysmmu_probe(struct > > platform_device *pdev) return ret; > > } > > > > +#ifdef CONFIG_PM_SLEEP > > +static int sysmmu_suspend(struct device *dev) > > +{ > > + struct sysmmu_drvdata *data = dev_get_drvdata(dev); > > + unsigned long flags; > > + read_lock_irqsave(&data->lock, flags); > > + if (is_sysmmu_active(data) && > > + (!pm_runtime_enabled(dev) || data->runtime_active)) > > + __sysmmu_disable_nocount(data); > > + read_unlock_irqrestore(&data->lock, flags); > > + return 0; > > +} > > + > > +static int sysmmu_resume(struct device *dev) > > +{ > > + struct sysmmu_drvdata *data = dev_get_drvdata(dev); > > + unsigned long flags; > > + read_lock_irqsave(&data->lock, flags); > > + if (is_sysmmu_active(data) && > > + (!pm_runtime_enabled(dev) || data->runtime_active)) > > + __sysmmu_enable_nocount(data); > > + read_unlock_irqrestore(&data->lock, flags); > > + return 0; > > +} > > +#endif > > + > > +static SIMPLE_DEV_PM_OPS(sysmmu_pm_ops, sysmmu_suspend, sysmmu_resume); > > + > > #ifdef CONFIG_OF > > static struct of_device_id sysmmu_of_match[] __initconst = { > > { .compatible = "samsung,exynos4210-sysmmu", }, > > @@ -756,6 +793,7 @@ static struct platform_driver exynos_sysmmu_driver > > __refdata = { .driver = { > > .owner = THIS_MODULE, > > .name = "exynos-sysmmu", > > + .pm = &sysmmu_pm_ops, > > .of_match_table = of_match_ptr(sysmmu_of_match), > > } > > }; > > @@ -1141,6 +1179,163 @@ static int __init exynos_iommu_init(void) > > } > > subsys_initcall(exynos_iommu_init); > > > > +#ifdef CONFIG_PM_SLEEP > > +static int sysmmu_pm_genpd_suspend(struct device *dev) > > +{ > > + struct exynos_iommu_client *client = dev->archdata.iommu; > > + int ret = 0; > > + int i; > > + > > + for (i = 0; i < client->num_sysmmu; i++) { > > + ret = pm_generic_suspend(client->sysmmu[i]); > > + if (ret) > > + break; > > + } > > + > > + if (!ret) > > + ret = pm_generic_suspend(dev); > > + > > + if (ret) { > > + int j; > > + > > + for (j = 0; j < i; j++) > > + pm_generic_resume(client->sysmmu[j]); > > + } > > + > > + return ret; > > +} > > + > > +static int sysmmu_pm_genpd_resume(struct device *dev) > > +{ > > + struct exynos_iommu_client *client = dev->archdata.iommu; > > + int ret = 0; > > + int i; > > + > > + for (i = 0; i < client->num_sysmmu; i++) { > > + ret = pm_generic_resume(client->sysmmu[i]); > > + if (ret) > > + break; > > Error handling here can be cleaned up a lot. > > s/break/goto err_suspend/ > > > + } > > + > > + if (!ret) > > Now you can drop this check. > > > + ret = pm_generic_resume(dev); > > ret = pm_generic_resume(dev); > if (ret) > goto err_suspend; > > return 0; > > > + > > err_suspend: > > + if (ret) { > > This check can be dropped here as well now. > Ok. Let me think about it :) Thank you! KyongHo. > > + int j; > > + > > + for (j = 0; j < i; j++) > > + pm_generic_suspend(client->sysmmu[j]); > > + } > > + > > + return ret; > > +} > > +#endif > > Best regards, > Tomasz > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html