[Nouveau] [PATCH 2/2] nouveau: implement precise vblank timestamping
Ben Skeggs
bskeggs at redhat.com
Wed Feb 15 20:28:34 PST 2012
On Wed, 2012-02-15 at 23:55 +0100, Mario Kleiner wrote:
> From: Lucas Stach <dev at lynxeye.de>
>
> This patch implements the drivers 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)
My only real issue with this patch after a quick review is that
NV50_PDISP_CRTC_P (proposed) is being used instead of _C (current).
There's also some minor formatting issues such as "if(blah)" instead of
"if (blah)" in a few places.
Ben.
>
> 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 5bd392f..7fdd6a4 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -431,3 +431,127 @@ 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 9791d13..555b4aa 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drv.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drv.c
> @@ -411,6 +411,8 @@ 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 = {
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
> index f489c22..52c3de7 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drv.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
> @@ -1419,6 +1419,11 @@ 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 882080e..89fbc31 100644
> --- a/drivers/gpu/drm/nouveau/nv50_crtc.c
> +++ b/drivers/gpu/drm/nouveau/nv50_crtc.c
> @@ -505,6 +505,25 @@ 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)
>
More information about the Nouveau
mailing list