This change adds pm suspend callbacks in order to trigger a gpio line
to push the CHIP_PWD_L reset/power line low on suspend. This puts the chip
into the lowest power state on suspend. On resume, it releases the line,
allowing the chip to boot. Slower, but provides a clean reset of the
chip and recovery from standby.
Signed-off-by: Steve deRosier <steve.derosier@xxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath6kl/sdio.c | 45 ++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/drivers/net/wireless/ath/ath6kl/sdio.c b/drivers/net/wireless/ath/ath6kl/sdio.c
index 7a732f3..b296809 100644
--- a/drivers/net/wireless/ath/ath6kl/sdio.c
+++ b/drivers/net/wireless/ath/ath6kl/sdio.c
@@ -1290,9 +1290,54 @@ static int ath6kl_sdio_pm_resume(struct device *device)
return 0;
}
+#ifdef CONFIG_GPIOLIB
+/* Below handlers leverage the PM system to make sure we turn on and off
+ * the power gpio at the right time. If we do it in the earlier power on
+ * and off handlers for the sdio, we get errors from the mmc subsystem.
+ */
+static int ath6kl_sdio_pm_suspend_late(struct device *device)
+{
+ ath6kl_dbg(ATH6KL_DBG_SUSPEND, "sdio pm ath6kl_sdio_pm_suspend_late\n");
+
+ if (gpio_is_valid(reset_pwd_gpio))
+ gpio_set_value(reset_pwd_gpio, 0);
+
+ return 0;
+}
+
+static int ath6kl_sdio_pm_resume_early(struct device *device)
+{
+ ath6kl_dbg(ATH6KL_DBG_SUSPEND, "sdio pm ath6kl_sdio_pm_resume_early\n");
+
+ if (gpio_is_valid(reset_pwd_gpio))
+ gpio_set_value(reset_pwd_gpio, 1);
+
+ usleep_range(1000, 5000); /* wait for power up */
+
+ return 0;
+}
+
+/* The GPIO version requires the more complex dev_pm_ops setup */
+const struct dev_pm_ops ath6kl_sdio_pm_ops = {
+ .suspend = ath6kl_sdio_pm_suspend,
+ .suspend_late = ath6kl_sdio_pm_suspend_late,
+ .resume_early = ath6kl_sdio_pm_resume_early,
+ .resume = ath6kl_sdio_pm_resume,
+ .freeze = ath6kl_sdio_pm_suspend,
+ .thaw = ath6kl_sdio_pm_resume,
+ .poweroff = ath6kl_sdio_pm_suspend,
+ .poweroff_late = ath6kl_sdio_pm_suspend_late,
+ .restore_early = ath6kl_sdio_pm_resume_early,
+ .restore = ath6kl_sdio_pm_resume,
+};
+
+#else
+
static SIMPLE_DEV_PM_OPS(ath6kl_sdio_pm_ops, ath6kl_sdio_pm_suspend,
ath6kl_sdio_pm_resume);
+#endif /* CONFIG_GPIOLIB */
+
#define ATH6KL_SDIO_PM_OPS (&ath6kl_sdio_pm_ops)
#else
--
1.9.1
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