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authorGovindraj.R <govindraj.raja@ti.com>2011-11-09 17:41:21 +0530
committerKevin Hilman <khilman@ti.com>2011-12-14 16:05:26 -0800
commit2fd149645eb46d26130d7070c6de037dddf34880 (patch)
tree1b7030c0c6f65ebf7ae061ab082ea26f47453679 /arch/arm/mach-omap2/serial.c
parent36fc2d15b120ef85be74c68b5ad74ac04fbefa8a (diff)
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ARM: OMAP2+: UART: Remove omap_uart_can_sleep and add pm_qos
Omap_uart_can_sleep function blocks system wide low power state until uart is active remove this func and add qos requests to prevent MPU from transitioning. Keep qos request to default value which will allow MPU to transition and while uart baud rate is available calculate the latency value from the baudrate and use the same to hold constraint while uart clocks are enabled, and if uart is auto-idled the constraint is updated with default constraint value allowing MPU to transition. Qos requests are blocking notifier calls so put these requests to work queue, also the driver uses irq_safe version of runtime API's and callbacks can be called in interrupt disabled context. So to avoid warn on slow path warning while using qos update API's from runtime callbacks use the qos_work_queue. During bootup the runtime_resume call backs might not be called and runtime callback gets called only after uart is idled by setting the autosuspend timeout. So qos_request from runtime resume callback might not activated during boot if uart baudrate is calculated during bootup for console uart, so schedule the qos_work queue once we calc_latency while configuring the uart port. Flush and complete any pending qos jobs in work queue while suspending. Signed-off-by: Govindraj.R <govindraj.raja@ti.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> (for drivers/tty changes) Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
-rw-r--r--arch/arm/mach-omap2/serial.c22
1 files changed, 0 insertions, 22 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index c909770eacd1..247d89478f24 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -82,28 +82,6 @@ static struct omap_uart_port_info omap_serial_default_info[] __initdata = {
};
#ifdef CONFIG_PM
-
-int omap_uart_can_sleep(void)
-{
- struct omap_uart_state *uart;
- int can_sleep = 1;
-
- list_for_each_entry(uart, &uart_list, node) {
- if (!uart->clocked)
- continue;
-
- if (!uart->can_sleep) {
- can_sleep = 0;
- continue;
- }
-
- /* This UART can now safely sleep. */
- omap_uart_allow_sleep(uart);
- }
-
- return can_sleep;
-}
-
static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
{
struct omap_device *od = to_omap_device(pdev);