[Nouveau] [PATCH 2/2] drm/nouveau: implement precise vblank timestamping
Lucas Stach
dev at lynxeye.de
Thu Feb 16 15:28:23 PST 2012
This patch implements the driver hooks needed for precise vblank
timestamping. This is a complementary patch to Mario Kleiner's
patches to improve swap scheduling. With the complete
patchset applied nouveau will be able to provide correct and
precise pageflip timestamps (compliant to OML_sync_control spec)
v2: Rebase on top of nouveau tree and update to reflect Ben's
review feedback.
Kudos to Mario for his many helpful comments and testing.
Signed-off-by: Lucas Stach <dev at lynxeye.de>
Reviewed-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
Tested-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
---
drivers/gpu/drm/nouveau/nouveau_display.c | 124 +++++++++++++++++++++++++++++
drivers/gpu/drm/nouveau/nouveau_drv.c | 2 +
drivers/gpu/drm/nouveau/nouveau_drv.h | 5 +
drivers/gpu/drm/nouveau/nouveau_reg.h | 9 ++-
drivers/gpu/drm/nouveau/nv50_crtc.c | 19 +++++
drivers/gpu/drm/nouveau/nvreg.h | 1 +
6 files changed, 159 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 818cfc9..1f836cd 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -635,3 +635,127 @@ nouveau_display_dumb_map_offset(struct drm_file *file_priv,
return -ENOENT;
}
+
+int
+nouveau_get_scanoutpos(struct drm_device *dev, int crtc, int *vpos, int *hpos)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ int vline, hline, ret = 0;
+ u32 vbias, hbias, reg, vbl_start, vbl_end;
+ struct drm_crtc *drmcrtc;
+
+ if (crtc < 0 || crtc >= dev->num_crtcs) {
+ DRM_ERROR("Invalid crtc %d\n", crtc);
+ return -EINVAL;
+ }
+
+ list_for_each_entry(drmcrtc, &dev->mode_config.crtc_list, head) {
+ if(nouveau_crtc(drmcrtc)->index == crtc)
+ /* stop if we have found crtc with matching index */
+ break;
+ }
+
+ if(dev_priv->card_type >= NV_50) {
+ /* get vsync and hsync area */
+ reg = nv_rd32(dev, NV50_PDISPLAY_CRTC_P(crtc,
+ SYNC_START_TO_BLANK_END));
+ vbias = (reg >> 16) & 0xffff;
+ hbias = reg & 0xffff;
+
+ /* get vertical display size including bias as vbl_start
+ * and vtotal as vbl_end */
+ vbl_start = (nv_rd32(dev, NV50_PDISPLAY_CRTC_P(crtc,
+ VBL_START)) >> 16) & 0xffff;
+ vbl_end = (nv_rd32(dev, NV50_PDISPLAY_CRTC_P(crtc,
+ DISPLAY_TOTAL)) >> 16) & 0xffff;
+
+ /* get current scanout position from PDISPLAY */
+ vline = nv_rd32(dev, NV50_PDISPLAY_CRTC_STAT_VERT(crtc))
+ & NV50_PDISPLAY_CRTC_STAT_VERT_VLINE__MASK;
+
+ /*
+ * vline == 0 could be invalid:
+ * Some gpu's get stuck on that value inside vblank. Try again
+ * after one scanline duration, if it still reads 0 give up.
+ */
+ if (vline == 0) {
+ ndelay(drmcrtc->linedur_ns & 0xffff);
+ vline = nv_rd32(dev, NV50_PDISPLAY_CRTC_STAT_VERT(crtc))
+ & NV50_PDISPLAY_CRTC_STAT_VERT_VLINE__MASK;
+ }
+
+ hline = nv_rd32(dev, NV50_PDISPLAY_CRTC_STAT_HORZ(crtc))
+ & NV50_PDISPLAY_CRTC_STAT_HORZ_HLINE__MASK;
+
+ if((vline > 0) && (vline < vbl_end))
+ ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
+
+ if((vline >= vbl_start) || (vline < vbias)) {
+ /* we are in vblank so do a neg countdown */
+ ret |= DRM_SCANOUTPOS_INVBL;
+ vline -= (vline < vbias) ? vbias : (vbl_end + vbias);
+ hline -= hbias;
+ } else {
+ /* apply corrective offset */
+ vline -= vbias;
+ hline -= hbias;
+ }
+ } else {
+ /* get vsync area from PRAMDAC */
+ vbl_start = NVReadRAMDAC(dev, crtc, NV_PRAMDAC_FP_VDISPLAY_END)
+ & 0xffff;
+ vbl_end = (NVReadRAMDAC(dev, crtc, NV_PRAMDAC_FP_VTOTAL)
+ & 0xffff) + 1;
+
+ /* get current scanout position from PCRTC */
+ vline = nv_rd32(dev, NV_PCRTC_STAT(crtc)) & 0xffff;
+
+ /*
+ * vline == 0 could be invalid:
+ * Some gpu's get stuck on that value inside vblank. Try again
+ * after one scanline duration, if it still reads 0 give up.
+ */
+ if (vline == 0) {
+ ndelay(drmcrtc->linedur_ns & 0xffff);
+ vline = nv_rd32(dev, NV_PCRTC_STAT(crtc)) & 0xffff;
+ }
+
+ if(vline > 0)
+ ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
+
+ /* are we in vblank? if yes: do neg countdown */
+ if((vline >= vbl_start) && (vline < vbl_end)) {
+ ret |= DRM_SCANOUTPOS_INVBL;
+ vline -= vbl_end;
+ }
+
+ hline = 0; /* don't use hline as it's unreliable */
+ }
+
+ *vpos = vline;
+ *hpos = hline;
+
+ return ret;
+}
+
+int
+nouveau_get_vblank_timestamp(struct drm_device *dev, int crtc,
+ int *max_error, struct timeval *vblank_time,
+ unsigned flags)
+{
+ struct drm_crtc *drmcrtc;
+
+ if (crtc < 0 || crtc >= dev->num_crtcs) {
+ DRM_ERROR("Invalid crtc %d\n", crtc);
+ return -EINVAL;
+ }
+
+ list_for_each_entry(drmcrtc, &dev->mode_config.crtc_list, head) {
+ if(nouveau_crtc(drmcrtc)->index == crtc)
+ /* stop if we have found crtc with matching index */
+ break;
+ }
+
+ return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
+ vblank_time, flags, drmcrtc);
+}
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.c b/drivers/gpu/drm/nouveau/nouveau_drv.c
index 4f2030b..4513bdf 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.c
@@ -427,6 +427,8 @@ static struct drm_driver driver = {
.get_vblank_counter = drm_vblank_count,
.enable_vblank = nouveau_vblank_enable,
.disable_vblank = nouveau_vblank_disable,
+ .get_vblank_timestamp = nouveau_get_vblank_timestamp,
+ .get_scanout_position = nouveau_get_scanoutpos,
.reclaim_buffers = drm_core_reclaim_buffers,
.ioctls = nouveau_ioctls,
.fops = &nouveau_driver_fops,
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 72c015d..dd281fa 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -1523,6 +1523,11 @@ int nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
struct drm_pending_vblank_event *event);
int nouveau_finish_page_flip(struct nouveau_channel *,
struct nouveau_page_flip_state *);
+int nouveau_get_scanoutpos(struct drm_device *dev, int crtc,
+ int *vpos, int *hpos);
+int nouveau_get_vblank_timestamp(struct drm_device *dev, int crtc,
+ int *max_error, struct timeval *vblank_time,
+ unsigned flags);
int nouveau_display_dumb_create(struct drm_file *, struct drm_device *,
struct drm_mode_create_dumb *args);
int nouveau_display_dumb_map_offset(struct drm_file *, struct drm_device *,
diff --git a/drivers/gpu/drm/nouveau/nouveau_reg.h b/drivers/gpu/drm/nouveau/nouveau_reg.h
index 43a96b9..0ec1945 100644
--- a/drivers/gpu/drm/nouveau/nouveau_reg.h
+++ b/drivers/gpu/drm/nouveau/nouveau_reg.h
@@ -762,7 +762,7 @@
#define NV50_PDISPLAY_CRTC_CLOCK 0x00610ad0
#define NV50_PDISPLAY_CRTC_COLOR_CTRL 0x00610ae0
#define NV50_PDISPLAY_CRTC_SYNC_START_TO_BLANK_END 0x00610ae8
-#define NV50_PDISPLAY_CRTC_MODE_UNK1 0x00610af0
+#define NV50_PDISPLAY_CRTC_VBL_START 0x00610af0
#define NV50_PDISPLAY_CRTC_DISPLAY_TOTAL 0x00610af8
#define NV50_PDISPLAY_CRTC_SYNC_DURATION 0x00610b00
#define NV50_PDISPLAY_CRTC_MODE_UNK2 0x00610b08
@@ -800,6 +800,13 @@
#define NV50_PDISPLAY_SOR_CLK 0x00614000
#define NV50_PDISPLAY_SOR_CLK_CTRL2(i) ((i) * 0x800 + 0x614300)
+#define NV50_PDISPLAY_CRTC_STAT_VERT(i0) (0x00616340 + 0x800*(i0))
+#define NV50_PDISPLAY_CRTC_STAT_VERT_VLINE__MASK 0x0000ffff
+#define NV50_PDISPLAY_CRTC_STAT_VERT_VBLANK_COUNT__MASK 0xffff0000
+#define NV50_PDISPLAY_CRTC_STAT_VERT_VBLANK_COUNT__SHIFT 16
+#define NV50_PDISPLAY_CRTC_STAT_HORZ(i0) (0x00616344 + 0x800*(i0))
+#define NV50_PDISPLAY_CRTC_STAT_HORZ_HLINE__MASK 0x0000ffff
+
#define NV50_PDISPLAY_VGACRTC(r) ((r) + 0x619400)
#define NV50_PDISPLAY_DAC 0x0061a000
diff --git a/drivers/gpu/drm/nouveau/nv50_crtc.c b/drivers/gpu/drm/nouveau/nv50_crtc.c
index 701b927..7f72431 100644
--- a/drivers/gpu/drm/nouveau/nv50_crtc.c
+++ b/drivers/gpu/drm/nouveau/nv50_crtc.c
@@ -538,6 +538,25 @@ static bool
nv50_crtc_mode_fixup(struct drm_crtc *crtc, struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
+ /* crtc_xxx fields are needed by drm core. Init them with the
+ * settings we actually use for mode programming. */
+ adjusted_mode->synth_clock = adjusted_mode->clock;
+ adjusted_mode->crtc_hdisplay = adjusted_mode->hdisplay;
+ adjusted_mode->crtc_hblank_start = 0;
+ adjusted_mode->crtc_hblank_end = 0;
+ adjusted_mode->crtc_hsync_start = adjusted_mode->hsync_start;
+ adjusted_mode->crtc_hsync_end = adjusted_mode->hsync_end;
+ adjusted_mode->crtc_htotal = adjusted_mode->htotal;
+ adjusted_mode->crtc_hskew = adjusted_mode->hskew;
+ adjusted_mode->crtc_vdisplay = adjusted_mode->vdisplay;
+ adjusted_mode->crtc_vblank_start = 0;
+ adjusted_mode->crtc_vblank_end = 0;
+ adjusted_mode->crtc_vsync_start = adjusted_mode->vsync_start;
+ adjusted_mode->crtc_vsync_end = adjusted_mode->vsync_end;
+ adjusted_mode->crtc_vtotal = adjusted_mode->vtotal;
+ adjusted_mode->crtc_hadjusted = 0;
+ adjusted_mode->crtc_vadjusted = 0;
+
return true;
}
diff --git a/drivers/gpu/drm/nouveau/nvreg.h b/drivers/gpu/drm/nouveau/nvreg.h
index bbfb1a6..e8281c4 100644
--- a/drivers/gpu/drm/nouveau/nvreg.h
+++ b/drivers/gpu/drm/nouveau/nvreg.h
@@ -172,6 +172,7 @@
#define NV_PCRTC_834 0x00600834
#define NV_PCRTC_850 0x00600850
#define NV_PCRTC_ENGINE_CTRL 0x00600860
+#define NV_PCRTC_STAT(i0) (0x00600868 + 0x2000*(i0))
# define NV_CRTC_FSEL_I2C (1 << 4)
# define NV_CRTC_FSEL_OVERLAY (1 << 12)
--
1.7.7.6
More information about the Nouveau
mailing list