[Intel-gfx] [PATCH i-g-t 2/4] lib: Skip suspend/hibernate tests if the system doesn't support them

[Jesse Barnes]

On 10/22/2015 01:35 PM, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Do a dry run with rtcwake first to determine if the system even supports
> the intended suspend state. If not, skip the test.
> 
> Fixes a bunch of stuff on my BYT FFRD8 that doesn't support S3.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  lib/igt_aux.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/lib/igt_aux.c b/lib/igt_aux.c
> index 04ca25b..f3c76ae 100644
> --- a/lib/igt_aux.c
> +++ b/lib/igt_aux.c
> @@ -357,6 +357,9 @@ void igt_system_suspend_autoresume(void)
>  	 * seems to fare better. We need to investigate what's going on. */
>  	igt_skip_on_simulation();
>  
> +	/* skip if system doesn't support suspend-to-mem */
> +	igt_skip_on(system("rtcwake -n -s 30 -m mem") != 0);
> +
>  	ret = system("rtcwake -s 30 -m mem");
>  	igt_assert_f(ret == 0,
>  		     "This failure means that something is wrong with the "
> @@ -384,6 +387,9 @@ void igt_system_hibernate_autoresume(void)
>  	 * seems to fare better. We need to investigate what's going on. */
>  	igt_skip_on_simulation();
>  
> +	/* skip if system doesn't support suspend-to-disk */
> +	igt_skip_on(system("rtcwake -n -s 90 -m disk") != 0);
> +
>  	/* The timeout might need to be adjusted if hibernation takes too long
>  	 * or if we have to wait excessively long before resume
>  	 */
> 

Are there reliable alternatives to the rtcwake alarm?  Maybe some AMT/MEI wakeup event or some ACPI clock thing (handwaving pretty hard here)?

Jesse