[Intel-gfx] [igt] igt/kms_psr_sink_crc: Add psr_drrs subtest

[Pandiyan, Dhinakaran]

On Fri, 2017-09-15 at 17:00 -0700, Radhakrishna Sripada wrote:
> Platforms do not support psr and drrs simultaneously.
> Adding a subtest to make the check.
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> ---
>  tests/kms_psr_sink_crc.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/tests/kms_psr_sink_crc.c b/tests/kms_psr_sink_crc.c
> index bd3fa5e94d85..1c25f2c81a34 100644
> --- a/tests/kms_psr_sink_crc.c
> +++ b/tests/kms_psr_sink_crc.c
> @@ -284,6 +284,15 @@ static void assert_or_manual(bool condition, const char *expected)
>  	igt_assert(igt_interactive_debug || condition);
>  }
>  
> +static bool drrs_disabled(data_t *data)
> +{
> +	char buf[512];
> +
> +	igt_debugfs_read(data->drm_fd, "i915_drrs_status", buf);
> +
> +	return strstr(buf, "DRRS Support: No\n");
                                        ^ 
This is causing the PSR sink crc test to fail. The string I see in the
kernel is. 

	seq_puts(m, "\tDRRS Supported : No");

Also, how does this work when there is more than one enabled crtc? For
e.g., my machine has 

 cat /sys/kernel/debug/dri/0/i915_drrs_status

CRTC 1:  eDP-1:
        VBT: DRRS_type: Static

        DRRS Supported : No

CRTC 2:  DP-4:
        VBT: DRRS_type: Static

        DRRS Supported : No

If the eDP supported DRRS( and PSR was enabled) and the external display
did not, won't this result in a false positive?


> +}
> +
>  static void run_test(data_t *data)
>  {
>  	uint32_t handle = data->fb_white.gem_handle;
> @@ -524,6 +533,11 @@ int main(int argc, char *argv[])
>  		igt_assert(wait_psr_entry(&data));
>  	}
>  
> +	igt_subtest("psr_drrs") {
> +		setup_test_plane(&data);
> +		igt_assert(drrs_disabled(&data));
> +	}
> +
>  	for (op = PAGE_FLIP; op <= RENDER; op++) {
>  		igt_subtest_f("primary_%s", op_str(op)) {
>  			data.test_plane = DRM_PLANE_TYPE_PRIMARY;