greybus: arche-platform: Assert wake/detect after SVC reset without delay

Since now driver supports interrupt based mechanism to read events
from SVC over wake/detect line, no need to delay wake/detect assertion.
We can assert wake/detect after SVC reset deassertion, so during boot
itself SVC will start sending wake_out pulses.

Testing Done: Tested on DB3.5 platform.

Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Reviewed-by: Michael Scott <michael.scott@linaro.org>
Tested-by: Michael Scott <michael.scott@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
index 83db892a8a5dbcde41966c66fb5ca8cd7f14540c..87526b2bf0a9ebef7a3c25e84483188ca7f4c899 100644 (file)
--- a/drivers/staging/greybus/arche-platform.c
+++ b/drivers/staging/greybus/arche-platform.c
@@ -115,6 +115,16 @@ static void hub_conf_delayed_work(struct work_struct *work)
                dev_warn(arche_pdata->dev, "failed to control hub device\n");
 }
 
+static void assert_wakedetect(struct arche_platform_drvdata *arche_pdata)
+{
+       /* Assert wake/detect = Detect event from AP */
+       gpio_direction_output(arche_pdata->wake_detect_gpio, 1);
+
+       /* Enable interrupt here, to read event back from SVC */
+       gpio_direction_input(arche_pdata->wake_detect_gpio);
+       enable_irq(arche_pdata->wake_detect_irq);
+}
+
 static irqreturn_t arche_platform_wd_irq_thread(int irq, void *devid)
 {
        struct arche_platform_drvdata *arche_pdata = devid;
@@ -297,6 +307,8 @@ static ssize_t state_store(struct device *dev,
                        return count;
 
                ret = arche_platform_coldboot_seq(arche_pdata);
+
+               assert_wakedetect(arche_pdata);
        } else if (sysfs_streq(buf, "standby")) {
                if (arche_pdata->state == ARCHE_PLATFORM_STATE_STANDBY)
                        return count;
@@ -482,6 +494,7 @@ static int arche_platform_probe(struct platform_device *pdev)
                goto err_populate;
        }
 
+       assert_wakedetect(arche_pdata);
        INIT_DELAYED_WORK(&arche_pdata->delayed_work, hub_conf_delayed_work);
 
        dev_info(dev, "Device registered successfully\n");