From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
linedur_ns, and especially pixeldur_ns are becoming rather inaccurate
to be used for the vblank timestamp correction. With 4k@60 the pixel
duration is already below 2ns, so the amount of error due to the
truncation to nanoseconds is introducing quite a bit of error.
We can avoid such problems if we instead calculate the timestamp
delta_ns directly from the dislay timings, avoiding the use of
these intermediate truncated values.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_irq.c | 19 ++++++++-----------
drivers/gpu/drm/i915/i915_irq.c | 4 ++--
drivers/gpu/drm/nouveau/nouveau_display.c | 3 ++-
drivers/gpu/drm/nouveau/nouveau_display.h | 3 ++-
drivers/gpu/drm/radeon/radeon_display.c | 14 ++++++++------
drivers/gpu/drm/radeon/radeon_drv.c | 5 +++--
drivers/gpu/drm/radeon/radeon_mode.h | 5 +++--
drivers/gpu/drm/radeon/radeon_pm.c | 4 +++-
include/drm/drmP.h | 6 ++++--
9 files changed, 35 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 6b2fefd..9fab333 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -694,12 +694,11 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
unsigned flags,
const struct drm_display_mode *mode)
{
- struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
struct timeval tv_etime;
ktime_t stime, etime;
int vbl_status;
int vpos, hpos, i;
- int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
+ int delta_ns, duration_ns;
bool invbl;
if (pipe >= dev->num_crtcs) {
@@ -713,15 +712,10 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
return -EIO;
}
- /* Durations of frames, lines, pixels in nanoseconds. */
- framedur_ns = vblank->framedur_ns;
- linedur_ns = vblank->linedur_ns;
- pixeldur_ns = vblank->pixeldur_ns;
-
/* If mode timing undefined, just return as no-op:
* Happens during initial modesetting of a crtc.
*/
- if (framedur_ns == 0) {
+ if (mode->crtc_clock == 0) {
DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
return -EAGAIN;
}
@@ -738,8 +732,10 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
* Get vertical and horizontal scanout position vpos, hpos,
* and bounding timestamps stime, etime, pre/post query.
*/
- vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, &vpos,
- &hpos, &stime, &etime);
+ vbl_status = dev->driver->get_scanout_position(dev, pipe, flags,
+ &vpos, &hpos,
+ &stime, &etime,
+ mode);
/* Return as no-op if scanout query unsupported or failed. */
if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
@@ -776,7 +772,8 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
* since start of scanout at first display scanline. delta_ns
* can be negative if start of scanout hasn't happened yet.
*/
- delta_ns = vpos * linedur_ns + hpos * pixeldur_ns;
+ delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos),
+ mode->crtc_clock);
if (!drm_timestamp_monotonic)
etime = ktime_mono_to_real(etime);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4aee725..77e8718 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -705,12 +705,12 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
unsigned int flags, int *vpos, int *hpos,
- ktime_t *stime, ktime_t *etime)
+ ktime_t *stime, ktime_t *etime,
+ const struct drm_display_mode *mode)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
- const struct drm_display_mode *mode = &intel_crtc->base.hwmode;
int position;
int vbl_start, vbl_end, hsync_start, htotal, vtotal;
bool in_vbl = true;
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 425515f..a82c3cb 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -133,7 +133,8 @@ nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos,
int
nouveau_display_scanoutpos(struct drm_device *dev, int head, unsigned int flags,
- int *vpos, int *hpos, ktime_t *stime, ktime_t *etime)
+ int *vpos, int *hpos, ktime_t *stime, ktime_t *etime,
+ const struct drm_display_mode *mode)
{
struct drm_crtc *crtc;
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index a6213e2..4182d21 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -68,7 +68,8 @@ void nouveau_display_resume(struct drm_device *dev, bool runtime);
int nouveau_display_vblank_enable(struct drm_device *, int);
void nouveau_display_vblank_disable(struct drm_device *, int);
int nouveau_display_scanoutpos(struct drm_device *, int, unsigned int,
- int *, int *, ktime_t *, ktime_t *);
+ int *, int *, ktime_t *, ktime_t *,
+ const struct drm_display_mode *);
int nouveau_display_vblstamp(struct drm_device *, int, int *,
struct timeval *, unsigned);
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index d2e9e9e..0503af7 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -323,7 +323,8 @@ void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id)
*/
if (update_pending &&
(DRM_SCANOUTPOS_VALID & radeon_get_crtc_scanoutpos(rdev->ddev, crtc_id, 0,
- &vpos, &hpos, NULL, NULL)) &&
+ &vpos, &hpos, NULL, NULL,
+ &rdev->mode_info.crtcs[crtc_id]->base.hwmode)) &&
((vpos >= (99 * rdev->mode_info.crtcs[crtc_id]->base.hwmode.crtc_vdisplay)/100) ||
(vpos < 0 && !ASIC_IS_AVIVO(rdev)))) {
/* crtc didn't flip in this target vblank interval,
@@ -1799,7 +1800,8 @@ bool radeon_crtc_scaling_mode_fixup(struct drm_crtc *crtc,
*
*/
int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int flags,
- int *vpos, int *hpos, ktime_t *stime, ktime_t *etime)
+ int *vpos, int *hpos, ktime_t *stime, ktime_t *etime,
+ const struct drm_display_mode *mode)
{
u32 stat_crtc = 0, vbl = 0, position = 0;
int vbl_start, vbl_end, vtotal, ret = 0;
@@ -1914,7 +1916,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl
}
else {
/* No: Fake something reasonable which gives at least ok results. */
- vbl_start = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay;
+ vbl_start = mode->crtc_vdisplay;
vbl_end = 0;
}
@@ -1930,7 +1932,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl
/* Inside "upper part" of vblank area? Apply corrective offset if so: */
if (in_vbl && (*vpos >= vbl_start)) {
- vtotal = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vtotal;
+ vtotal = mode->crtc_vtotal;
*vpos = *vpos - vtotal;
}
@@ -1952,8 +1954,8 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl
* We only do this if DRM_CALLED_FROM_VBLIRQ.
*/
if ((flags & DRM_CALLED_FROM_VBLIRQ) && !in_vbl) {
- vbl_start = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay;
- vtotal = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vtotal;
+ vbl_start = mode->crtc_vdisplay;
+ vtotal = mode->crtc_vtotal;
if (vbl_start - *vpos < vtotal / 100) {
*vpos -= vtotal;
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 5751446..e30c1d7 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -126,8 +126,9 @@ struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
int flags);
extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc,
unsigned int flags,
- int *vpos, int *hpos, ktime_t *stime,
- ktime_t *etime);
+ int *vpos, int *hpos,
+ ktime_t *stime, ktime_t *etime,
+ const struct drm_display_mode *mode);
extern bool radeon_is_px(struct drm_device *dev);
extern const struct drm_ioctl_desc radeon_ioctls_kms[];
extern int radeon_max_kms_ioctl;
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index aecc3e3..2317d04 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -876,8 +876,9 @@ extern void radeon_cursor_reset(struct drm_crtc *crtc);
extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc,
unsigned int flags,
- int *vpos, int *hpos, ktime_t *stime,
- ktime_t *etime);
+ int *vpos, int *hpos,
+ ktime_t *stime, ktime_t *etime,
+ const struct drm_display_mode *mode);
extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);
extern struct edid *
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 05751f3..10f4c12 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -1733,7 +1733,9 @@ static bool radeon_pm_in_vbl(struct radeon_device *rdev)
*/
for (crtc = 0; (crtc < rdev->num_crtc) && in_vbl; crtc++) {
if (rdev->pm.active_crtcs & (1 << crtc)) {
- vbl_status = radeon_get_crtc_scanoutpos(rdev->ddev, crtc, 0, &vpos, &hpos, NULL, NULL);
+ vbl_status = radeon_get_crtc_scanoutpos(rdev->ddev, crtc, 0,
+ &vpos, &hpos, NULL, NULL,
+ &rdev->mode_info.crtcs[crtc]->base.hwmode);
if ((vbl_status & DRM_SCANOUTPOS_VALID) &&
!(vbl_status & DRM_SCANOUTPOS_IN_VBLANK))
in_vbl = false;
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 2998867..b2a95e7 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -482,6 +482,7 @@ struct drm_driver {
* scanout position query. Can be NULL to skip timestamp.
* \param *etime Target location for timestamp taken immediately after
* scanout position query. Can be NULL to skip timestamp.
+ * \param mode Current display timings.
*
* Returns vpos as a positive number while in active scanout area.
* Returns vpos as a negative number inside vblank, counting the number
@@ -499,8 +500,9 @@ struct drm_driver {
*/
int (*get_scanout_position) (struct drm_device *dev, int crtc,
unsigned int flags,
- int *vpos, int *hpos, ktime_t *stime,
- ktime_t *etime);
+ int *vpos, int *hpos,
+ ktime_t *stime, ktime_t *etime,
+ const struct drm_display_mode *mode);
/**
* Called by \c drm_get_last_vbltimestamp. Should return a precise
--
2.4.6
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