"Govindraj.R" <govindraj.raja@xxxxxx> writes:
> Prior to this patch the uart_clock was cut using prepare/resume calls since
> these funcs are no more available with runtime changes use has_async_wake
> flag to keep clock active during bootup otherwise uart port will disabled
> during boot-up and cannot be enabled back.
Is this only a bootup issue, or a runtime PM issue? It appears to me
that with this patch, runtime PM is effectively disabled for the whole
time.
Why not just use pm_runtime_disable() in _probe() for devices with no
async wakeup.
> Also based on this flag we can disable uart port during suspend and
> enable back during resume for omap_socs that have not set
> has_async_wake.
Then you can use pm_runtime_enable() in ->prepare() and
pm_runtime_disable() in ->complete()
Kevin
> Signed-off-by: Govindraj.R <govindraj.raja@xxxxxx>
> ---
> arch/arm/mach-omap2/serial.c | 1 +
> arch/arm/plat-omap/include/plat/omap-serial.h | 3 +++
> drivers/tty/serial/omap-serial.c | 14 ++++++++++++++
> 3 files changed, 18 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
> index 4bc5914..0a95c95 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -266,6 +266,7 @@ static void omap_uart_idle_init(struct omap_uart_port_info *uart,
> break;
> }
> uart->wk_mask = wk_mask;
> + uart->has_async_wake = true;
> } else if (cpu_is_omap24xx()) {
> u32 wk_mask = 0;
> u32 wk_en = PM_WKEN1, wk_st = PM_WKST1;
> diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h
> index b5117bd..69e6d4b 100644
> --- a/arch/arm/plat-omap/include/plat/omap-serial.h
> +++ b/arch/arm/plat-omap/include/plat/omap-serial.h
> @@ -79,6 +79,7 @@ struct omap_uart_port_info {
> void __iomem *wk_st;
> void __iomem *wk_en;
> u32 wk_mask;
> + bool has_async_wake;
> };
>
> struct uart_omap_dma {
> @@ -134,6 +135,8 @@ struct uart_omap_port {
> unsigned int errata;
> void (*enable_wakeup)(struct platform_device *, bool);
> bool (*chk_wakeup)(struct platform_device *);
> +
> + bool has_async_wake;
> };
>
> #endif /* __OMAP_SERIAL_H__ */
> diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
> index c3561dd..dbe76f3 100644
> --- a/drivers/tty/serial/omap-serial.c
> +++ b/drivers/tty/serial/omap-serial.c
> @@ -1181,6 +1181,13 @@ static int serial_omap_suspend(struct device *dev)
> uart_suspend_port(&serial_omap_reg, &up->port);
> console_trylock();
> serial_omap_pm(&up->port, 3, 0);
> +
> + /* OMAP2 dont have async wakeup from prcm.
> + * For such socs clocks will be kept active from probe and
> + * cut only in suspend path.
> + */
> + if (!up->has_async_wake)
> + serial_omap_port_disable(up);
> }
> return 0;
> }
> @@ -1192,6 +1199,9 @@ static int serial_omap_resume(struct device *dev)
> if (up) {
> uart_resume_port(&serial_omap_reg, &up->port);
> console_unlock();
> +
> + if (!up->has_async_wake)
> + serial_omap_port_enable(up);
> }
>
> return 0;
> @@ -1415,6 +1425,7 @@ static int serial_omap_probe(struct platform_device *pdev)
> up->errata = omap_up_info->errata;
> up->enable_wakeup = omap_up_info->enable_wakeup;
> up->chk_wakeup = omap_up_info->chk_wakeup;
> + up->has_async_wake = omap_up_info->has_async_wake;
>
> if (omap_up_info->dma_enabled) {
> up->uart_dma.uart_dma_tx = dma_tx->start;
> @@ -1443,6 +1454,9 @@ static int serial_omap_probe(struct platform_device *pdev)
> serial_omap_port_disable(up);
> }
>
> + if (!up->has_async_wake)
> + serial_omap_port_enable(up);
> +
> ui[pdev->id] = up;
> serial_omap_add_console_port(up);
--
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