On Wed, Oct 07, 2015 at 12:53:49AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> If the upcoming system suspend is not going to be handled by the
> platform firmware, like in the suspend-to-idle case, it is not
> necessary to reset the controller in i8042_pm_suspend(), so avoid
> doing that.
>
> Moreover, if the system resume currently in progress has not been
> started by the platform firmware, like in the suspend-to-idle case,
> i8042_controller_resume() need not be called by i8042_pm_resume(),
> so avoid doing that too in that case.
>
> Additionally, try to catch the event that woke up the system by
> calling the interrupt handler early during system resume if it has
> not been started by the platform firmware.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
> drivers/input/serio/i8042.c | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> Index: linux-pm/drivers/input/serio/i8042.c
> ===================================================================
> --- linux-pm.orig/drivers/input/serio/i8042.c
> +++ linux-pm/drivers/input/serio/i8042.c
> @@ -24,6 +24,7 @@
> #include <linux/platform_device.h>
> #include <linux/i8042.h>
> #include <linux/slab.h>
> +#include <linux/suspend.h>
>
> #include <asm/io.h>
>
> @@ -1170,7 +1171,8 @@ static int i8042_pm_suspend(struct devic
> {
> int i;
>
> - i8042_controller_reset(true);
> + if (pm_suspend_via_firmware())
> + i8042_controller_reset(true);
>
> /* Set up serio interrupts for system wakeup. */
> for (i = 0; i < I8042_NUM_PORTS; i++) {
> @@ -1183,6 +1185,14 @@ static int i8042_pm_suspend(struct devic
> return 0;
> }
>
> +static int i8042_pm_resume_noirq(struct device *dev)
> +{
> + if (!pm_resume_via_firmware())
> + i8042_interrupt(0, NULL);
> +
> + return 0;
> +}
> +
> static int i8042_pm_resume(struct device *dev)
> {
> int i;
> @@ -1199,7 +1209,7 @@ static int i8042_pm_resume(struct device
> * to bring it in a sane state. (In case of S2D we expect
> * BIOS to reset the controller for us.)
> */
> - return i8042_controller_resume(true);
> + return pm_resume_via_firmware() ? i8042_controller_resume(true) : 0;
What happens if we were going to suspend via firmware so we reset the
controller but then we got wakeup condition and we actually did not
suspend. What pm_resume_via_firmware() will return in this case?
Thanks.
--
Dmitry
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