tests/kms_plane_scaling: test for multi pipe with scaling, v3.

Add a subtest to display primary and overlay planes on two
connected pipes and runs scaling test on both pipes

Changes since v1:
- Commit first before trying any scaling. (Maarten)
- Use the same logic as kms_cursor_legacy to find a pipe and output. (Maarten)
- Rework test to work with how cleanup is handled. (Maarten)
Changes since v2:
- Use get_num_scalers() to only use 2 scalers if available. (Maarten)

Signed-off-by: Jyoti Yadav <jyoti.r.yadav@intel.com>
Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
1 file changed