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authorTony Lindgren <tony@atomide.com>2014-03-25 11:48:47 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-16 14:19:13 -0700
commitd758c9c1b36b4d9a141c2146c70398d756167ed1 (patch)
tree5b300e37228195c31af4e3056185908efab52aa7
parentbf903c0c6ddfedec19ba92626ca30e98bfafbe08 (diff)
serial: omap: Fix missing pm_runtime_resume handling by simplifying code
The lack of pm_runtime_resume handling for the device state leads into device wake-up interrupts not working after a while for runtime PM. Also, serial-omap is confused about the use of device_may_wakeup. The checks for device_may_wakeup should only be done for suspend and resume, not for pm_runtime_suspend and pm_runtime_resume. The wake-up events for PM runtime should always be enabled. The lack of pm_runtime_resume handling leads into device wake-up interrupts not working after a while for runtime PM. Rather than try to patch over the issue of adding complex tests to the pm_runtime_resume, let's fix the issues properly: 1. Make serial_omap_enable_wakeup deal with all internal PM state handling so we don't need to test for up->wakeups_enabled elsewhere. Later on once omap3 boots in device tree only mode we can also remove the up->wakeups_enabled flag and rely on the wake-up interrupt enable/disable state alone. 2. Do the device_may_wakeup checks in suspend and resume only, for runtime PM the wake-up events need to be always enabled. 3. Finally just call serial_omap_enable_wakeup and make sure we call it also in pm_runtime_resume. 4. Note that we also have to use disable_irq_nosync as serial_omap_irq calls pm_runtime_get_sync. Fixes: 2a0b965cfb6e (serial: omap: Add support for optional wake-up) Cc: stable@vger.kernel.org # v3.13+ Signed-off-by: Tony Lindgren <tony@atomide.com> Acked-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/omap-serial.c29
1 files changed, 17 insertions, 12 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index ecfafbb30356..08b6b9419f0d 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -225,14 +225,19 @@ static inline void serial_omap_enable_wakeirq(struct uart_omap_port *up,
if (enable)
enable_irq(up->wakeirq);
else
- disable_irq(up->wakeirq);
+ disable_irq_nosync(up->wakeirq);
}
static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
{
struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
+ if (enable == up->wakeups_enabled)
+ return;
+
serial_omap_enable_wakeirq(up, enable);
+ up->wakeups_enabled = enable;
+
if (!pdata || !pdata->enable_wakeup)
return;
@@ -1495,6 +1500,11 @@ static int serial_omap_suspend(struct device *dev)
uart_suspend_port(&serial_omap_reg, &up->port);
flush_work(&up->qos_work);
+ if (device_may_wakeup(dev))
+ serial_omap_enable_wakeup(up, true);
+ else
+ serial_omap_enable_wakeup(up, false);
+
return 0;
}
@@ -1502,6 +1512,9 @@ static int serial_omap_resume(struct device *dev)
{
struct uart_omap_port *up = dev_get_drvdata(dev);
+ if (device_may_wakeup(dev))
+ serial_omap_enable_wakeup(up, false);
+
uart_resume_port(&serial_omap_reg, &up->port);
return 0;
@@ -1878,17 +1891,7 @@ static int serial_omap_runtime_suspend(struct device *dev)
up->context_loss_cnt = serial_omap_get_context_loss_count(up);
- if (device_may_wakeup(dev)) {
- if (!up->wakeups_enabled) {
- serial_omap_enable_wakeup(up, true);
- up->wakeups_enabled = true;
- }
- } else {
- if (up->wakeups_enabled) {
- serial_omap_enable_wakeup(up, false);
- up->wakeups_enabled = false;
- }
- }
+ serial_omap_enable_wakeup(up, true);
up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
schedule_work(&up->qos_work);
@@ -1902,6 +1905,8 @@ static int serial_omap_runtime_resume(struct device *dev)
int loss_cnt = serial_omap_get_context_loss_count(up);
+ serial_omap_enable_wakeup(up, false);
+
if (loss_cnt < 0) {
dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
loss_cnt);

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