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drm/i915/display: Helpers for VRR vblank min and max start

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With VRR the earliest the registers can get latched are at
flipline decision boundary, calculate that as vrr_vmin_vblank_start()
and the latest the regsiters can get latched are vmax decision boundary
calculate that as vrr_vmax_vblank_start()

v2:
* Remove TODO and adjust extra scanline const (Manasi)

Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210122232647.22688-15-manasi.d.navare@intel.com
This commit is contained in:
Ville Syrjälä 2021-01-22 15:26:44 -08:00 committed by Manasi Navare
parent c7f0f4372b
commit 4ef619a7df
2 changed files with 38 additions and 0 deletions
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36
drivers/gpu/drm/i915/display/intel_vrr.c
View File

@ -45,6 +45,42 @@ intel_vrr_check_modeset(struct intel_atomic_state *state)
}
}
/*
* Without VRR registers get latched at:
* vblank_start
*
* With VRR the earliest registers can get latched is:
* intel_vrr_vmin_vblank_start(), which if we want to maintain
* the correct min vtotal is >=vblank_start+1
*
* The latest point registers can get latched is the vmax decision boundary:
* intel_vrr_vmax_vblank_start()
*
* Between those two points the vblank exit starts (and hence registers get
* latched) ASAP after a push is sent.
*
* framestart_delay is programmable 0-3.
*/
static int intel_vrr_vblank_exit_length(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *i915 = to_i915(crtc->base.dev);
/* The hw imposes the extra scanline before frame start */
return crtc_state->vrr.pipeline_full + i915->framestart_delay + 1;
}
int intel_vrr_vmin_vblank_start(const struct intel_crtc_state *crtc_state)
{
/* Min vblank actually determined by flipline that is always >=vmin+1 */
return crtc_state->vrr.vmin + 1 - intel_vrr_vblank_exit_length(crtc_state);
}
int intel_vrr_vmax_vblank_start(const struct intel_crtc_state *crtc_state)
{
return crtc_state->vrr.vmax - intel_vrr_vblank_exit_length(crtc_state);
}
void
intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state)

2
drivers/gpu/drm/i915/display/intel_vrr.h
View File

@ -27,5 +27,7 @@ void intel_vrr_send_push(const struct intel_crtc_state *crtc_state);
void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state);
void intel_vrr_get_config(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state);
int intel_vrr_vmax_vblank_start(const struct intel_crtc_state *crtc_state);
int intel_vrr_vmin_vblank_start(const struct intel_crtc_state *crtc_state);
#endif /* __INTEL_VRR_H__ */