Testcase for plane visibility after atomic modesets. The idea of the test
is the following:

 - draw a blue screen with high resolution
 - enable a yellow plane, visible, in lower-left corner
 - set a new lower resolution mode (1024x768) that makes plane invisible
 - check from debugfs 'i915_display_info' that the plane is invisible
 - switch back to higher resolution mode
 - check from debugfs 'i915_display_info' that the plane is visible again
 - repeat number of iterations, default 64

Signed-off-by: Mika Kahola <mika.kah...@intel.com>
---
 tests/Makefile.sources   |   1 +
 tests/kms_plane_lowres.c | 424 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 425 insertions(+)
 create mode 100644 tests/kms_plane_lowres.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index debe3df..9ebdc44 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -109,6 +109,7 @@ TESTS_progs_M = \
        kms_pipe_crc_basic \
        kms_plane \
        kms_plane_multiple \
+       kms_plane_lowres \
        kms_properties \
        kms_psr_sink_crc \
        kms_render \
diff --git a/tests/kms_plane_lowres.c b/tests/kms_plane_lowres.c
new file mode 100644
index 0000000..6735a3b
--- /dev/null
+++ b/tests/kms_plane_lowres.c
@@ -0,0 +1,424 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "igt.h"
+#include "drmtest.h"
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+IGT_TEST_DESCRIPTION("Test atomic mode setting with a plane by switching 
between high and low resolutions");
+
+#define MAX_CRCS          1
+#define SIZE            256
+#define LOOP_FOREVER     -1
+
+typedef struct {
+       int drm_fd;
+       igt_display_t display;
+       igt_pipe_crc_t *pipe_crc;
+       igt_plane_t *plane[2];
+       struct igt_fb fb[2];
+} data_t;
+
+typedef struct {
+       int id;
+       int width;
+       int height;
+} res_t;
+
+/* Command line parameters. */
+struct {
+       int iterations;
+} opt = {
+       .iterations = 64,
+};
+
+static inline uint32_t pipe_select(int pipe)
+{
+       if (pipe > 1)
+               return pipe << DRM_VBLANK_HIGH_CRTC_SHIFT;
+       else if (pipe > 0)
+               return DRM_VBLANK_SECONDARY;
+       else
+               return 0;
+}
+
+static unsigned int get_vblank(int fd, int pipe, unsigned int flags)
+{
+       union drm_wait_vblank vbl;
+
+       memset(&vbl, 0, sizeof(vbl));
+       vbl.request.type = DRM_VBLANK_RELATIVE | pipe_select(pipe) | flags;
+       if (drmIoctl(fd, DRM_IOCTL_WAIT_VBLANK, &vbl))
+               return 0;
+
+       return vbl.reply.sequence;
+}
+
+static int parse_resolution(res_t *resolution, char *info)
+{
+       char size[32];
+       int ret;
+
+       ret = sscanf(info + 4, "%d%*c %*s %*s %*s %s%*c",
+                    &resolution->id, size);
+
+       if (ret != 2)
+               return -1;
+
+       ret = sscanf(size + 6, "%d%*c%d%*c",
+                    &resolution->width, &resolution->height);
+
+       if (ret != 2)
+               return -1;
+
+       return ret + 1;
+}
+
+static bool get_visibility(FILE *fid, res_t *resolution)
+{
+       char tmp[256];
+       res_t plane;
+       int ret;
+
+       while (fgets(tmp, 256, fid) != NULL) {
+               if (strstr(tmp, "type=OVL") != NULL) {
+                       ret = sscanf(tmp + 12, "%d%*c %*s %*s %d%*c%d%*c",
+                                    &plane.id, &plane.width, &plane.height);
+
+                       igt_assert_eq(ret, 3);
+
+                       if (plane.width > resolution->width)
+                               return false;
+                       else if (plane.height > resolution->height)
+                               return false;
+                       else
+                               return true;
+               }
+       }
+
+       return false;
+}
+
+static bool plane_visible(void)
+{
+       char tmp[256];
+       FILE *fid;
+       bool visible = false;
+       res_t resolution;
+       int ret;
+
+       fid  = fopen("/sys/kernel/debug/dri/0/i915_display_info", "r");
+
+       if (fid == NULL)
+               return false;
+
+       while (fgets(tmp, 256, fid) != NULL) {
+               if (strstr(tmp, "active=yes") != NULL) {
+                       ret = parse_resolution(&resolution, tmp);
+                       igt_assert_eq(ret, 3);
+                       visible = get_visibility(fid, &resolution);
+               }
+       }
+
+       fclose(fid);
+
+       return visible;
+}
+
+static void test_init(data_t *data, enum pipe pipe)
+{
+       data->pipe_crc = igt_pipe_crc_new(pipe, INTEL_PIPE_CRC_SOURCE_AUTO);
+}
+
+static void test_fini(data_t *data, igt_output_t *output)
+{
+       /* restore original mode */
+       igt_output_override_mode(output, NULL);
+
+       for (int i = 0; i < 2; i++)
+               igt_plane_set_fb(data->plane[i], NULL);
+
+       /* reset the constraint on the pipe */
+       igt_output_set_pipe(output, PIPE_ANY);
+
+       igt_pipe_crc_free(data->pipe_crc);
+}
+
+static int
+display_commit_mode(data_t *data, enum pipe pipe, int flags, igt_crc_t *crc)
+{
+       char buf[256];
+       struct drm_event *e = (void *)buf;
+       unsigned int vblank_start, vblank_stop;
+       int n, ret;
+
+       vblank_start = get_vblank(data->display.drm_fd, pipe,
+                                 DRM_VBLANK_NEXTONMISS);
+
+       ret = igt_display_try_commit_atomic(&data->display,
+                                           flags,
+                                           NULL);
+       igt_skip_on(ret != 0);
+
+       igt_set_timeout(1, "Stuck on page flip");
+       ret = read(data->display.drm_fd, buf, sizeof(buf));
+       igt_assert(ret >= 0);
+
+       vblank_stop = get_vblank(data->display.drm_fd, pipe, 0);
+       igt_assert_eq(e->type, DRM_EVENT_FLIP_COMPLETE);
+       igt_reset_timeout();
+
+       n = igt_pipe_crc_get_crcs(data->pipe_crc, vblank_stop - vblank_start,
+                                 &crc);
+       igt_assert_eq(n, vblank_stop - vblank_start);
+
+       return n;
+}
+
+static drmModeModeInfo *
+test_setup(data_t *data, enum pipe pipe, uint64_t tiling, int flags,
+          igt_output_t *output)
+{
+       drmModeModeInfo *mode;
+       int x, y;
+
+       igt_output_set_pipe(output, pipe);
+
+       data->plane[0] = igt_output_get_plane(output, IGT_PLANE_PRIMARY);
+       data->plane[1] = igt_output_get_plane(output, IGT_PLANE_2);
+
+       mode = igt_output_get_mode(output);
+
+       x = 0;
+       y = mode->vdisplay - SIZE;
+
+       igt_create_color_fb(data->drm_fd, mode->hdisplay, mode->vdisplay,
+                           DRM_FORMAT_XRGB8888,
+                           LOCAL_DRM_FORMAT_MOD_NONE,
+                           0.0, 0.0, 1.0,
+                           &data->fb[0]);
+
+       igt_plane_set_fb(data->plane[0], &data->fb[0]);
+
+       /* yellow sprite plane in lower left corner */
+       igt_create_color_fb(data->drm_fd,
+                           SIZE, SIZE,
+                           DRM_FORMAT_XRGB8888,
+                           tiling,
+                           1.0, 1.0, 0.0,
+                           &data->fb[1]);
+
+       igt_plane_set_position(data->plane[1], x, y);
+       igt_plane_set_fb(data->plane[1], &data->fb[1]);
+
+       return mode;
+}
+
+static void
+test_plane_position_with_output(data_t *data, enum pipe pipe,
+                               igt_output_t *output, uint64_t tiling)
+{
+       igt_crc_t *crc_hires1, *crc_hires2;
+       igt_crc_t *crc_lowres;
+       drmModeModeInfo std_1024_mode = {
+               .clock = 65000,
+               .hdisplay = 1024,
+               .hsync_start = 1048,
+               .hsync_end = 1184,
+               .htotal = 1344,
+               .hskew = 0,
+               .vdisplay = 768,
+               .vsync_start = 771,
+               .vsync_end = 777,
+               .vtotal = 806,
+               .vscan = 0,
+               .vrefresh = 60,
+               .flags = 0xA,
+               .type = 0x40,
+               .name = "Custom 1024x768",
+       };
+       int flags = DRM_MODE_PAGE_FLIP_EVENT | DRM_MODE_ATOMIC_ALLOW_MODESET;
+       drmModeModeInfo *mode1, *mode2, *mode3;
+       int ret, i, n;
+       int iterations = opt.iterations < 1 ? 1 : opt.iterations;
+       bool loop_forever;
+       char info[256];
+
+       if (opt.iterations == LOOP_FOREVER) {
+               loop_forever = true;
+               sprintf(info, "forever");
+       } else {
+               loop_forever = false;
+               sprintf(info, "for %d %s",
+                       iterations, iterations > 1 ? "iterations" : 
"iteration");
+       }
+
+       igt_info("Testing connector %s using pipe %s %s\n",
+                igt_output_name(output), kmstest_pipe_name(pipe), info);
+
+       test_init(data, pipe);
+
+       mode1 = test_setup(data, pipe, tiling, flags, output);
+
+       igt_pipe_crc_start(data->pipe_crc);
+       ret = igt_display_try_commit2(&data->display, COMMIT_ATOMIC);
+       igt_skip_on(ret != 0);
+
+       n = igt_pipe_crc_get_crcs(data->pipe_crc, 1, &crc_hires1);
+       igt_assert_eq(1, n);
+
+       igt_assert_eq(plane_visible(), true);
+
+       i = 0;
+       while (i < iterations || loop_forever) {
+               /* switch to lower resolution */
+               igt_output_override_mode(output, &std_1024_mode);
+               igt_output_set_pipe(output, pipe);
+
+               mode2 = igt_output_get_mode(output);
+
+               igt_assert_eq(std_1024_mode.hdisplay, mode2->hdisplay);
+               igt_assert_eq(std_1024_mode.vdisplay, mode2->vdisplay);
+               igt_assert_eq(std_1024_mode.vrefresh, mode2->vrefresh);
+
+               display_commit_mode(data, pipe, flags, crc_lowres);
+               igt_assert_eq(plane_visible(), false);
+
+               /* switch back to higher resolution */
+               igt_output_override_mode(output, NULL);
+               igt_output_set_pipe(output, pipe);
+
+               mode3 = igt_output_get_mode(output);
+
+               igt_assert_eq(mode1->hdisplay, mode3->hdisplay);
+               igt_assert_eq(mode1->vdisplay, mode3->vdisplay);
+               igt_assert_eq(mode1->vrefresh, mode3->vrefresh);
+
+               display_commit_mode(data, pipe, flags, crc_hires2);
+               igt_assert_eq(plane_visible(), true);
+
+               i++;
+       }
+
+       igt_pipe_crc_stop(data->pipe_crc);
+
+       test_fini(data, output);
+}
+
+static void
+test_plane_position(data_t *data, enum pipe pipe, uint64_t tiling)
+{
+       igt_output_t *output;
+       int connected_outs;
+
+       igt_require(data->display.is_atomic);
+       igt_skip_on(pipe >= data->display.n_pipes);
+
+       connected_outs = 0;
+       for_each_connected_output(&data->display, output) {
+               test_plane_position_with_output(data, pipe, output, tiling);
+               connected_outs++;
+       }
+
+       igt_skip_on(connected_outs == 0);
+
+}
+
+static void
+run_tests_for_pipe(data_t *data, enum pipe pipe)
+{
+       igt_subtest_f("pipe-%s-tiling-none",
+                     kmstest_pipe_name(pipe))
+               test_plane_position(data, pipe, LOCAL_I915_FORMAT_MOD_X_TILED);
+
+       igt_subtest_f("pipe-%s-tiling-x",
+                     kmstest_pipe_name(pipe))
+               test_plane_position(data, pipe, LOCAL_I915_FORMAT_MOD_X_TILED);
+
+       igt_subtest_f("pipe-%s-tiling-y",
+                     kmstest_pipe_name(pipe))
+               test_plane_position(data, pipe, LOCAL_I915_FORMAT_MOD_Y_TILED);
+
+       igt_subtest_f("pipe-%s-tiling-yf",
+                     kmstest_pipe_name(pipe))
+               test_plane_position(data, pipe, LOCAL_I915_FORMAT_MOD_Yf_TILED);
+}
+
+static data_t data;
+
+static int opt_handler(int option, int option_index, void *input)
+{
+       switch (option) {
+       case 'i':
+               opt.iterations = strtol(optarg, NULL, 0);
+
+               if (opt.iterations < LOOP_FOREVER || opt.iterations == 0) {
+                       igt_info("incorrect number of iterations\n");
+                       igt_assert(false);
+               }
+               break;
+       default:
+               igt_assert(false);
+       }
+
+       return 0;
+}
+
+const char *help_str =
+       "  --iterations Number of iterations for test coverage. -1 loop 
forever, default 64 iterations\n";
+
+int main(int argc, char *argv[])
+{
+       struct option long_options[] = {
+               { "iterations", required_argument, NULL, 'i'},
+               { 0, 0, 0, 0 }
+       };
+
+       igt_subtest_init_parse_opts(&argc, argv, "", long_options, help_str,
+                                   opt_handler, NULL);
+
+       igt_skip_on_simulation();
+
+       igt_fixture {
+               data.drm_fd = drm_open_driver_master(DRIVER_INTEL);
+
+               kmstest_set_vt_graphics_mode();
+
+               igt_require_pipe_crc();
+               igt_display_init(&data.display, data.drm_fd);
+       }
+
+       for (int pipe = 0; pipe < I915_MAX_PIPES; pipe++)
+               run_tests_for_pipe(&data, pipe);
+
+       igt_fixture {
+               igt_display_fini(&data.display);
+       }
+
+       igt_exit();
+}
-- 
2.7.4

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