Commit 995c0ec9 authored by Jeffery Yu's avatar Jeffery Yu Committed by Benson Leung

platform/chrome: cros_ec_lightbar - Avoid I2C xfer to EC during suspend

A Mutex lock in cros_ec_cmd_xfer which may be held by frozen
Userspace thread during system suspending. So should not
call this routine in suspend thread.
Signed-off-by: default avatarJeffery Yu <jefferyy@nvidia.com>
Signed-off-by: default avatarGuenter Roeck <groeck@chromium.org>
Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: default avatarBenson Leung <bleung@chromium.org>
parent abbb054d
......@@ -437,7 +437,6 @@ static int ec_device_probe(struct platform_device *pdev)
cros_ec_sensors_register(ec);
/* Take control of the lightbar from the EC. */
if (ec_has_lightbar(ec))
lb_manual_suspend_ctrl(ec, 1);
return 0;
......@@ -452,7 +451,6 @@ static int ec_device_remove(struct platform_device *pdev)
struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
/* Let the EC take over the lightbar again. */
if (ec_has_lightbar(ec))
lb_manual_suspend_ctrl(ec, 0);
cros_ec_debugfs_remove(ec);
......@@ -472,7 +470,6 @@ static int ec_device_suspend(struct device *dev)
{
struct cros_ec_dev *ec = dev_get_drvdata(dev);
if (ec_has_lightbar(ec))
lb_suspend(ec);
return 0;
......@@ -482,7 +479,6 @@ static int ec_device_resume(struct device *dev)
{
struct cros_ec_dev *ec = dev_get_drvdata(dev);
if (ec_has_lightbar(ec))
lb_resume(ec);
return 0;
......
......@@ -43,6 +43,7 @@ static unsigned long lb_interval_jiffies = 50 * HZ / 1000;
* If this is true, we won't do anything during suspend/resume.
*/
static bool userspace_control;
static struct cros_ec_dev *ec_with_lightbar;
static ssize_t interval_msec_show(struct device *dev,
struct device_attribute *attr, char *buf)
......@@ -384,6 +385,9 @@ int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
struct cros_ec_command *msg;
int ret;
if (ec != ec_with_lightbar)
return 0;
msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
return -ENOMEM;
......@@ -413,7 +417,7 @@ int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
int lb_suspend(struct cros_ec_dev *ec)
{
if (userspace_control)
if (userspace_control || ec != ec_with_lightbar)
return 0;
return lb_send_empty_cmd(ec, LIGHTBAR_CMD_SUSPEND);
......@@ -421,7 +425,7 @@ int lb_suspend(struct cros_ec_dev *ec)
int lb_resume(struct cros_ec_dev *ec)
{
if (userspace_control)
if (userspace_control || ec != ec_with_lightbar)
return 0;
return lb_send_empty_cmd(ec, LIGHTBAR_CMD_RESUME);
......@@ -606,9 +610,10 @@ static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
return 0;
/* Only instantiate this stuff if the EC has a lightbar */
if (ec_has_lightbar(ec))
if (ec_has_lightbar(ec)) {
ec_with_lightbar = ec;
return a->mode;
}
return 0;
}
......
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