[PATCH v3 2/6] pinctrl: rockchip: save and restore gpio6_c6 pinmux in suspend/resume

zyw
2014-10-21T03:43:56Z

From: Chris Zhong <zyw@rock-chips.com>

Save and restore the gpio6_c6 pinmux setting, since Maskrom of RK3288
would modify it to sdmmc0_det, so it need to be restored to the correct
setting after resume from Maskrom.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

Changes in v3: None
Changes in v2: None

drivers/pinctrl/pinctrl-rockchip.c | 30 +++++++++++++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index d384d99..85134e4 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -1796,26 +1796,54 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
}

#ifdef CONFIG_PM
+
+#define RK3288_GRF_GPIO6C_IOMUX 0x64
+#define GPIO6C6_SEL_WRITE_ENABLE BIT(28)
+
+static u32 rk3288_grf_gpio6c_iomux;
+
static int rockchip_pinctrl_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct rockchip_pinctrl *info;
+ int ret;

info = platform_get_drvdata(pdev);
if (!info)
return -EINVAL;

- return pinctrl_force_sleep(info->pctl_dev);
+ ret = pinctrl_force_sleep(info->pctl_dev);
+ if (ret)
+ return ret;
+
+ /*
+ * RK3288 GPIO6_C6 mux would be modified by Maskrom when resume, so save
+ * the setting here, and restore it at resume.
+ */
+ if (info->ctrl->type == RK3288) {
+ ret = regmap_read(info->regmap_base, RK3288_GRF_GPIO6C_IOMUX,
+ &rk3288_grf_gpio6c_iomux);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
}

static int rockchip_pinctrl_resume(struct platform_device *pdev)
{
struct rockchip_pinctrl *info;
+ int ret;

info = platform_get_drvdata(pdev);
if (!info)
return -EINVAL;

+ ret = regmap_write(info->regmap_base, RK3288_GRF_GPIO6C_IOMUX,
+ rk3288_grf_gpio6c_iomux | GPIO6C6_SEL_WRITE_ENABLE);
+ if (ret)
+ return ret;
+
return pinctrl_force_default(info->pctl_dev);
}
#endif
--
1.7.9.5