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From 3bb403bf421b5b00366a9041a7edc0a1f6494f5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Mon, 14 Sep 2015 22:43:44 +0300
Subject: [PATCH 0566/1565] drm: Stop using linedur_ns and pixeldur_ns for
vblank timestamps
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[danvet: Squash in fixup from Thierry Reding for amdgpu.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 11 ++++++-----
drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h | 3 ++-
2 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index e3d7077..9b34a34 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -745,7 +745,8 @@ bool amdgpu_crtc_scaling_mode_fixup(struct drm_crtc *crtc,
*
*/
int amdgpu_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 vbl = 0, position = 0;
int vbl_start, vbl_end, vtotal, ret = 0;
@@ -781,7 +782,7 @@ int amdgpu_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 = adev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay;
+ vbl_start = mode->crtc_vdisplay;
vbl_end = 0;
}
@@ -797,7 +798,7 @@ int amdgpu_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 = adev->mode_info.crtcs[crtc]->base.hwmode.crtc_vtotal;
+ vtotal = mode->crtc_vtotal;
*vpos = *vpos - vtotal;
}
@@ -819,8 +820,8 @@ int amdgpu_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 = adev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay;
- vtotal = adev->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/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
index 64efe5b..2b03425 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
@@ -543,7 +543,8 @@ void amdgpu_encoder_set_active_device(struct drm_encoder *encoder);
int amdgpu_get_crtc_scanoutpos(struct drm_device *dev, int crtc,
unsigned int flags,
int *vpos, int *hpos, ktime_t *stime,
- ktime_t *etime);
+ ktime_t *etime,
+ const struct drm_display_mode *mode);
int amdgpu_framebuffer_init(struct drm_device *dev,
struct amdgpu_framebuffer *rfb,
--
1.9.1
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