Tomasz, On Fri, May 17, 2013 at 9:24 AM, Tomasz Figa <[email protected]> wrote: > Some GPIO EINT control registers needs to be preserved across > suspend/resume cycle. This patch extends the driver to take care of > this.
I was confused why we didn't seem to need this on exynos5250-snow but figured it out. We only use interrupts on GPX lines which don't need this code. ...but on any exynos5250 boards that use one of the other banks for interrupts you'd need it. I tested by setting one of the registers related to GPA0 and found that this code is indeed needed on exynos5250. :) Just nits / optional comments below, so on exynos5250-snow (pinmux backported to 3.8): Tested-by: Doug Anderson <[email protected]> Reviewed-by: Doug Anderson <[email protected]> > @@ -229,6 +235,11 @@ static int exynos_eint_gpio_init(struct > samsung_pinctrl_drv_data *d) > dev_err(dev, "gpio irq domain add failed\n"); > return -ENXIO; > } > + > + bank->soc_priv = devm_kzalloc(d->dev, > + sizeof(struct exynos_eint_gpio_save), GFP_KERNEL); > + if (!bank->soc_priv) > + return -ENOMEM; Slight nit to add this before the call to irq_domain_add_linear(). demv() will handle freeing your memory but nothing will handle undoing the irq_domain_add_linear() if you return an error. > } > > return 0; > @@ -528,6 +539,58 @@ static int exynos_eint_wkup_init(struct > samsung_pinctrl_drv_data *d) > return 0; > } > > +static void exynos_pinctrl_suspend_bank( > + struct samsung_pinctrl_drv_data *drvdata, > + struct samsung_pin_bank *bank) > +{ > + struct exynos_eint_gpio_save *save = bank->soc_priv; > + void __iomem *regs = drvdata->virt_base; > + > + save->eint_con = readl(regs + EXYNOS_GPIO_ECON_OFFSET > + + bank->eint_offset); > + save->eint_fltcon0 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET > + + 2 * bank->eint_offset); > + save->eint_fltcon1 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET > + + 2 * bank->eint_offset + 4); Optional: I wish there were debug statements to help debug, like: pr_debug("%s: save con %#010x\n", bank->name, save->eint_con); pr_debug("%s: save fltcon0 %#010x\n", bank->name, save->eint_fltcon0); pr_debug("%s: save fltcon1 %#010x\n", bank->name, save->eint_fltcon1); > +} > + > +static void exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data *drvdata) > +{ > + struct samsung_pin_ctrl *ctrl = drvdata->ctrl; > + struct samsung_pin_bank *bank = ctrl->pin_banks; > + int i; > + > + for (i = 0; i < ctrl->nr_banks; ++i, ++bank) > + if (bank->eint_type == EINT_TYPE_GPIO) > + exynos_pinctrl_suspend_bank(drvdata, bank); > +} > + > +static void exynos_pinctrl_resume_bank( > + struct samsung_pinctrl_drv_data *drvdata, > + struct samsung_pin_bank *bank) > +{ > + struct exynos_eint_gpio_save *save = bank->soc_priv; > + void __iomem *regs = drvdata->virt_base; > + Optional: debug statements: pr_debug("%s: con %#010x => %#010x\n", bank->name, readl(regs + EXYNOS_GPIO_ECON_OFFSET + bank->eint_offset), save->eint_con); pr_debug("%s: fltcon0 %#010x => %#010x\n", bank->name, readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET + 2 * bank->eint_offset), save->eint_fltcon0); pr_debug("%s: fltcon1 %#010x => %#010x\n", bank->name, readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET + 2 * bank->eint_offset + 4), save->eint_fltcon1); -Doug -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
