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backends/native: Add meta_calculate_drm_mode_vblank_duration_us()

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Computes the vblank duration from mode timings.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1762>
This commit is contained in:
Ivan Molodetskikh 2021-01-06 11:36:04 +03:00 committed by Marge Bot
parent 63b9ac2724
commit e40ff9d8b7
3 changed files with 129 additions and 4 deletions
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21
src/backends/native/meta-kms-utils.c
View file

@ -47,6 +47,27 @@ meta_calculate_drm_mode_refresh_rate (const drmModeModeInfo *drm_mode)
return numerator / denominator;
}
int64_t
meta_calculate_drm_mode_vblank_duration_us (const drmModeModeInfo *drm_mode)
{
int64_t value;
if (drm_mode->htotal <= 0 || drm_mode->vtotal <= 0)
return 0;
/* Convert to int64_t early. */
value = drm_mode->vtotal - drm_mode->vdisplay;
value *= drm_mode->htotal;
if (drm_mode->flags & DRM_MODE_FLAG_DBLSCAN)
value *= 2;
/* Round the duration up as it is used for buffer swap deadline computation. */
value = (value * 1000 + drm_mode->clock - 1) / drm_mode->clock;
return value;
}
/**
* meta_drm_format_to_string:
* @tmp: temporary buffer

3
src/backends/native/meta-kms-utils.h
View file

@ -34,6 +34,9 @@ typedef struct _MetaDrmFormatBuf
META_EXPORT_TEST
float meta_calculate_drm_mode_refresh_rate (const drmModeModeInfo *drm_mode);
META_EXPORT_TEST
int64_t meta_calculate_drm_mode_vblank_duration_us (const drmModeModeInfo *drm_mode);
const char * meta_drm_format_to_string (MetaDrmFormatBuf *tmp,
uint32_t drm_format);

109
src/tests/kms-utils-unit-tests.c
View file

@ -26,9 +26,9 @@
typedef struct {
drmModeModeInfo drm_mode;
float expected_refresh_rate;
} ModeInfoTestCase;
} RefreshRateTestCase;
static const ModeInfoTestCase test_cases[] = {
static const RefreshRateTestCase refresh_rate_test_cases[] = {
/* "cvt 640 480" */
{
.drm_mode = {
@ -125,9 +125,9 @@ meta_test_kms_refresh_rate (void)
{
size_t index;
for (index = 0; index < G_N_ELEMENTS(test_cases); index++)
for (index = 0; index < G_N_ELEMENTS (refresh_rate_test_cases); index++)
{
const ModeInfoTestCase *test_case = test_cases + index;
const RefreshRateTestCase *test_case = refresh_rate_test_cases + index;
float refresh_rate;
refresh_rate =
@ -138,6 +138,105 @@ meta_test_kms_refresh_rate (void)
}
}
typedef struct
{
drmModeModeInfo drm_mode;
int64_t expected_vblank_duration_us;
} VblankDurationTestCase;
static const VblankDurationTestCase vblank_duration_test_cases[] = {
/* "cvt 640 480" */
{
.drm_mode = {
.clock = 23975,
.hdisplay = 640,
.hsync_start = 664,
.hsync_end = 720,
.htotal = 800,
.vdisplay = 480,
.vsync_start = 483,
.vsync_end = 487,
.vtotal = 500,
.vscan = 0,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
},
.expected_vblank_duration_us = 668,
},
/* "cvt 640 480" with htotal 0 */
{
.drm_mode = {
.clock = 23975,
.hdisplay = 640,
.hsync_start = 664,
.hsync_end = 720,
.htotal = 0,
.vdisplay = 480,
.vsync_start = 483,
.vsync_end = 487,
.vtotal = 500,
.vscan = 0,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
},
.expected_vblank_duration_us = 0,
},
/* "cvt 640 480" with vtotal 0 */
{
.drm_mode = {
.clock = 23975,
.hdisplay = 640,
.hsync_start = 664,
.hsync_end = 720,
.htotal = 800,
.vdisplay = 480,
.vsync_start = 483,
.vsync_end = 487,
.vtotal = 0,
.vscan = 0,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
},
.expected_vblank_duration_us = 0,
},
/* "cvt 640 480" with DBLSCAN */
{
.drm_mode = {
.clock = 23975,
.hdisplay = 640,
.hsync_start = 664,
.hsync_end = 720,
.htotal = 800,
.vdisplay = 480,
.vsync_start = 483,
.vsync_end = 487,
.vtotal = 500,
.vscan = 0,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC |
DRM_MODE_FLAG_DBLSCAN,
},
.expected_vblank_duration_us = 1335,
},
};
static void
meta_test_kms_vblank_duration (void)
{
size_t index;
for (index = 0; index < G_N_ELEMENTS (vblank_duration_test_cases); index++)
{
const VblankDurationTestCase *test_case = vblank_duration_test_cases + index;
int64_t vblank_duration_us;
vblank_duration_us =
meta_calculate_drm_mode_vblank_duration_us (&test_case->drm_mode);
g_assert_cmpint (vblank_duration_us,
==,
test_case->expected_vblank_duration_us);
}
}
static void
meta_test_kms_update_fixed16 (void)
{
@ -152,6 +251,8 @@ init_kms_utils_tests (void)
{
g_test_add_func ("/backends/native/kms/refresh-rate",
meta_test_kms_refresh_rate);
g_test_add_func ("/backends/native/kms/vblank-duration",
meta_test_kms_vblank_duration);
g_test_add_func ("/backends/native/kms/update/fixed16",
meta_test_kms_update_fixed16);
}