On Wednesday, October 07, 2015 03:03:57 AM 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>
If there are no more comments here, I'll tentatively queue it up for v4.4
along with the [1-2/3] from this series.
Please let me know if there are any problems with that.
Thanks,
Rafael
> ---
> drivers/input/serio/i8042.c | 32 +++++++++++++++++++++++++++-----
> 1 file changed, 27 insertions(+), 5 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++) {
> @@ -1183,8 +1185,17 @@ 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)
> {
> + bool force_reset;
> int i;
>
> for (i = 0; i < I8042_NUM_PORTS; i++) {
> @@ -1195,11 +1206,21 @@ static int i8042_pm_resume(struct device
> }
>
> /*
> - * On resume from S2R we always try to reset the controller
> - * to bring it in a sane state. (In case of S2D we expect
> - * BIOS to reset the controller for us.)
> + * If platform firmware was not going to be involved in suspend, we did
> + * not restore the controller state to whatever it had been at boot
> + * time, so we do not need to do anything.
> */
> - return i8042_controller_resume(true);
> + if (!pm_suspend_via_firmware())
> + return 0;
> +
> + /*
> + * We only need to reset the controller if we are resuming after handing
> + * off control to the platform firmware, otherwise we can simply restore
> + * the mode.
> + */
> + force_reset = pm_resume_via_firmware();
> +
> + return i8042_controller_resume(force_reset);
> }
>
> static int i8042_pm_thaw(struct device *dev)
> @@ -1223,6 +1244,7 @@ static int i8042_pm_restore(struct devic
>
> static const struct dev_pm_ops i8042_pm_ops = {
> .suspend = i8042_pm_suspend,
> + .resume_noirq = i8042_pm_resume_noirq,
> .resume = i8042_pm_resume,
> .thaw = i8042_pm_thaw,
> .poweroff = i8042_pm_reset,
>
> --
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