[igt-dev] [PATCH i-g-t] tests/psr: Skip if PSR cannot be enabled for the current mode.

[Souza, Jose]

On Tue, 2018-07-31 at 23:43 -0700, Dhinakaran Pandiyan wrote:
> PSR tests on ICL fail waiting for PSR to become active, whereas the
> driver does not enable it on the HW due to unmet timing requirements
> [  482.485873] [drm:intel_dp_compute_config [i915]] PSR condition
> failed: PSR setup time (330 us) too long
> We should probably bring back the kernel patch that programmed an
> alternate
> mode, but skip tests for now.
> 
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> ---
>  tests/kms_psr.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/kms_psr.c b/tests/kms_psr.c
> index 218b3960..89118ad4 100644
> --- a/tests/kms_psr.c
> +++ b/tests/kms_psr.c
> @@ -193,11 +193,19 @@ static bool sink_support(data_t *data)
>  	char buf[512];
>  
>  	igt_debugfs_read(data->drm_fd, "i915_edp_psr_status", buf);
> -
>  	return data->with_psr_disabled ||
>  		strstr(buf, "Sink_Support: yes\n");
>  }
>  
> +static bool mode_support(data_t *data)
> +{
> +	char buf[512];
> +
> +	igt_debugfs_read(data->drm_fd, "i915_edp_psr_status", buf);
> +	return data->with_psr_disabled ||
> +		strstr(buf, "Enabled: yes\n");
> +}

This could hide bugs in gen <= 9.

> +
>  static bool psr_wait_entry_if_enabled(data_t *data)
>  {
>  	if (data->with_psr_disabled)
> @@ -422,6 +430,8 @@ int main(int argc, char *argv[])
>  		drm_intel_bufmgr_gem_enable_reuse(data.bufmgr);
>  
>  		display_init(&data);
> +		igt_require_f(mode_support(&data),
> +			     "PSR not enabled for current mode\n");

Why not just require that gen is <= 9 or 10(if it is working in CNL)?
and leave a TODO.

>  	}
>  
>  	igt_subtest("basic") {