PSR allows DMC to put the system to low power states when active, but
this can reset the frame counter on some platforms. The frame counter reset
leads to a negative diff applied to vblank count. This subtest checks
for that.
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
---
tests/kms_psr_sink_crc.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)
diff --git a/tests/kms_psr_sink_crc.c b/tests/kms_psr_sink_crc.c
index 83a69f0b..f76c3041 100644
--- a/tests/kms_psr_sink_crc.c
+++ b/tests/kms_psr_sink_crc.c
@@ -69,6 +69,7 @@ typedef struct {
enum operations op;
uint32_t devid;
uint32_t crtc_id;
+ enum pipe pipe;
igt_display_t display;
drm_intel_bufmgr *bufmgr;
struct igt_fb fb_green, fb_white;
@@ -107,6 +108,7 @@ static void setup_output(data_t *data)
if (c->connector_type != DRM_MODE_CONNECTOR_eDP)
continue;
+ data->pipe = pipe;
igt_output_set_pipe(output, pipe);
data->crtc_id = output->config.crtc->crtc_id;
data->output = output;
@@ -285,6 +287,68 @@ static void assert_or_manual(bool condition, const char *expected)
igt_assert(igt_interactive_debug || condition);
}
+static unsigned int get_vblank(int fd, unsigned int pipe)
+{
+ union drm_wait_vblank vbl;
+
+ memset(&vbl, 0, sizeof(vbl));
+ vbl.request.type = DRM_VBLANK_RELATIVE | kmstest_get_vbl_flag(pipe);
+ igt_ioctl(fd, DRM_IOCTL_WAIT_VBLANK, &vbl);
+
+ return vbl.reply.sequence;
+}
+
+static void dmc_read_counts(unsigned int fd, unsigned int *count)
+{
+ char buf[512];
+
+ igt_debugfs_read(fd, "i915_dmc_info", buf);
+ igt_assert_eq(sscanf(strstr(buf, "DC3 -> DC5"), "DC3 -> DC5 count: %u", &count[0]),
+ 1);
+ igt_assert_eq(sscanf(strstr(buf, "DC5 -> DC6"), "DC5 -> DC6 count: %u", &count[1]),
+ 1);
+ igt_debug("DC3->DC5 count=%d, DC5->DC6 count=%d\n", count[0], count[1]);
+}
+
+static bool has_dmc(unsigned int fd)
+{
+ char buf[512];
+
+ igt_debugfs_read(fd, "i915_dmc_info", buf);
+ return strstr(buf, "fw loaded: yes");
+}
+
+static void check_vblanks(data_t *data)
+{
+ unsigned int first_vblank, second_vblank;
+ int wait = 30; /* Takes about 2.5 seconds for DC_OFF disable */
+
+ first_vblank = get_vblank(data->drm_fd, data->pipe);
+
+ if (has_dmc(data->drm_fd)) {
+ unsigned int new_dc[2], old_dc[2];
+
+ dmc_read_counts(data->drm_fd, new_dc);
+ do {
+ memcpy(old_dc, new_dc, sizeof(new_dc));
+ usleep(100 * 1000);
+ dmc_read_counts(data->drm_fd, new_dc);
+ } while (!memcmp(old_dc, new_dc, sizeof(new_dc)) && --wait);
+
+ igt_assert(wait);
+
+ } else {
+ sleep(3);
+ }
+
+ second_vblank = get_vblank(data->drm_fd, data->pipe);
+ igt_debug("vblank count went from %d to %d in %d ms.\n",
+ first_vblank, second_vblank,
+ has_dmc(data->drm_fd) ? (30 - wait) * 100 : 3000);
+
+ igt_assert_lt(first_vblank, second_vblank);
+}
+
static bool drrs_disabled(data_t *data)
{
char buf[512];
@@ -572,6 +636,13 @@ int main(int argc, char *argv[])
}
}
+ igt_subtest("vblank") {
+ setup_test_plane(&data);
+ igt_assert(wait_psr_entry(&data));
+ check_vblanks(&data);
+ test_cleanup(&data);
+ }
+
igt_subtest_f("dpms_off_psr_active") {
data.test_plane = DRM_PLANE_TYPE_PRIMARY;
data.op = RENDER;
--
2.11.0
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