[PATCH v3 i-g-t] test/kms_plane_lowres: Fix display_commit_mode() so it returns the crc

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

From: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

Compiler complained on crc_lowres and crc_hires2 being uninitialized
and indeed, display_commit_mode() seems to have intention of retruning
the value through the parameter that is only a single pointer.

This couses only the local copy of the pointer, the one inside
display_commit_mode(), to be overwritten.

Let's fix that!

Also add missing hires crc comparison (M. Kahola).

v2: make display_commit_mode return just the last CRC
v3: Don't do memory allocations, it's hard. (Maarten)

Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
So sorry, didn't like the memory allocations, hope this works.. else I'll commit v2..

tests/kms_plane_lowres.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/tests/kms_plane_lowres.c b/tests/kms_plane_lowres.c
index 85d3145de4b6..f643bb4b0e8f 100644
--- a/tests/kms_plane_lowres.c
+++ b/tests/kms_plane_lowres.c
@@ -125,11 +125,12 @@ test_fini(data_t *data, igt_output_t *output, enum pipe pipe)
 	data->fb = NULL;
 }
 
-static int
+static void
 display_commit_mode(igt_display_t *display, igt_pipe_crc_t *pipe_crc,
-		    enum pipe pipe, int flags, igt_crc_t *crc)
+		    enum pipe pipe, int flags, igt_crc_t *out_crc)
 {
 	char buf[256];
+	igt_crc_t *crcs;
 	struct drm_event *e = (void *)buf;
 	unsigned int vblank_start, vblank_stop;
 	int n, ret;
@@ -148,10 +149,12 @@ display_commit_mode(igt_display_t *display, igt_pipe_crc_t *pipe_crc,
 	igt_assert_eq(e->type, DRM_EVENT_FLIP_COMPLETE);
 	igt_reset_timeout();
 
-	n = igt_pipe_crc_get_crcs(pipe_crc, vblank_stop - vblank_start, &crc);
+	n = igt_pipe_crc_get_crcs(pipe_crc, vblank_stop - vblank_start, &crcs);
 	igt_assert_eq(n, vblank_stop - vblank_start);
 
-	return n;
+	/* there is no need to return all the intermediary CRCs */
+	/* so let's return just the last one */
+	*out_crc = crcs[n-1];
 }
 
 static void
@@ -218,8 +221,8 @@ static void
 test_plane_position_with_output(data_t *data, enum pipe pipe,
 				igt_output_t *output, uint64_t modifier)
 {
-	igt_crc_t *crc_hires1, *crc_hires2;
-	igt_crc_t *crc_lowres;
+	igt_crc_t crc_hires1, crc_hires2, *crcs;
+	igt_crc_t crc_lowres;
 	drmModeModeInfo mode_lowres;
 	drmModeModeInfo *mode1, *mode2, *mode3;
 	int ret, n;
@@ -239,8 +242,10 @@ test_plane_position_with_output(data_t *data, enum pipe pipe,
 	pipe_crc = igt_pipe_crc_new(data->drm_fd, pipe, INTEL_PIPE_CRC_SOURCE_AUTO);
 	igt_pipe_crc_start(pipe_crc);
 
-	n = igt_pipe_crc_get_crcs(pipe_crc, 1, &crc_hires1);
+	n = igt_pipe_crc_get_crcs(pipe_crc, 1, &crcs);
 	igt_assert_eq(1, n);
+	crc_hires1 = *crcs;
+	free(crcs);
 
 	igt_assert_plane_visible(data->drm_fd, pipe, true);
 
@@ -252,7 +257,7 @@ test_plane_position_with_output(data_t *data, enum pipe pipe,
 
 	check_mode(&mode_lowres, mode2);
 
-	display_commit_mode(&data->display, pipe_crc, pipe, flags, crc_lowres);
+	display_commit_mode(&data->display, pipe_crc, pipe, flags, &crc_lowres);
 
 	igt_assert_plane_visible(data->drm_fd, pipe, false);
 
@@ -264,10 +269,12 @@ test_plane_position_with_output(data_t *data, enum pipe pipe,
 
 	check_mode(mode1, mode3);
 
-	display_commit_mode(&data->display, pipe_crc, pipe, flags, crc_hires2);
+	display_commit_mode(&data->display, pipe_crc, pipe, flags, &crc_hires2);
 
 	igt_assert_plane_visible(data->drm_fd, pipe, true);
 
+	igt_assert_crc_equal(&crc_hires1, &crc_hires2);
+
 	igt_pipe_crc_stop(pipe_crc);
 	igt_pipe_crc_free(pipe_crc);
 
-- 
2.15.1

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