pinctrl: qcom: use restart_notifier mechanism for ps_hold
By converting to the restart_notifier mechanism for restart, we allow
for other mechanisms, like the watchdog, to be used for restart in the
case where PS_HOLD has failed to reset the chip.
Since this mechanism may be one of several mechanisms registered, change
the post-ps_hold write timeout to be a more reasonable 1 second instead
of 10 seconds.
Choose priority 128, as according to documentation, this mechanism "is
sufficient to restart the entire system".
Tested-by: Pramod Gurav <pramod.gurav@smartplayin.com>
Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index d5ed127..d30dddd 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -27,8 +27,7 @@
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
-
-#include <asm/system_misc.h>
+#include <linux/reboot.h>
#include "../core.h"
#include "../pinconf.h"
@@ -43,6 +42,7 @@
* @dev: device handle.
* @pctrl: pinctrl handle.
* @chip: gpiochip handle.
+ * @restart_nb: restart notifier block.
* @irq: parent irq for the TLMM irq_chip.
* @lock: Spinlock to protect register resources as well
* as msm_pinctrl data structures.
@@ -56,6 +56,7 @@
struct device *dev;
struct pinctrl_dev *pctrl;
struct gpio_chip chip;
+ struct notifier_block restart_nb;
int irq;
spinlock_t lock;
@@ -852,13 +853,14 @@
return 0;
}
-#ifdef CONFIG_ARM
-static void __iomem *msm_ps_hold;
-
-static void msm_reset(enum reboot_mode reboot_mode, const char *cmd)
+static int msm_ps_hold_restart(struct notifier_block *nb, unsigned long action,
+ void *data)
{
- writel(0, msm_ps_hold);
- mdelay(10000);
+ struct msm_pinctrl *pctrl = container_of(nb, struct msm_pinctrl, restart_nb);
+
+ writel(0, pctrl->regs + PS_HOLD_OFFSET);
+ mdelay(1000);
+ return NOTIFY_DONE;
}
static void msm_pinctrl_setup_pm_reset(struct msm_pinctrl *pctrl)
@@ -868,13 +870,14 @@
for (; i <= pctrl->soc->nfunctions; i++)
if (!strcmp(func[i].name, "ps_hold")) {
- msm_ps_hold = pctrl->regs + PS_HOLD_OFFSET;
- arm_pm_restart = msm_reset;
+ pctrl->restart_nb.notifier_call = msm_ps_hold_restart;
+ pctrl->restart_nb.priority = 128;
+ if (register_restart_handler(&pctrl->restart_nb))
+ dev_err(pctrl->dev,
+ "failed to setup restart handler.\n");
+ break;
}
}
-#else
-static void msm_pinctrl_setup_pm_reset(const struct msm_pinctrl *pctrl) {}
-#endif
int msm_pinctrl_probe(struct platform_device *pdev,
const struct msm_pinctrl_soc_data *soc_data)
@@ -943,6 +946,8 @@
pinctrl_unregister(pctrl->pctrl);
+ unregister_restart_handler(&pctrl->restart_nb);
+
return 0;
}
EXPORT_SYMBOL(msm_pinctrl_remove);