drm/i915/vrr: Add functions to read out vmin/vmax stuff

Calculate delayed vblank start position with the help of added
vmin/vmax stuff for next frame and final computation.

--v2:
- Correct Author details.

--v3:
- Separate register details from this  patch.

--v4:
- Add mask macros.

--v5:
- As live prefix params indicate timings for current frame,
read just _live prefix values instead of next frame timings as
done previously.
- Squash Refactor vrr params patch.

--v6:
- Use error code while returning invalid values. (Jani, Nikula)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20251223104542.2688548-5-mitulkumar.ajitkumar.golani@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index b92c42fde937f6d40e30b08fa372cc2ac1ec00f9..31f3a7b6e00dd4e26cbf59479058a19358436004 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -261,6 +261,12 @@ static int intel_vrr_hw_value(const struct intel_crtc_state *crtc_state,
                return value - crtc_state->set_context_latency;
 }
 
+static int intel_vrr_vblank_start(const struct intel_crtc_state *crtc_state,
+                                 int vmin_vmax)
+{
+       return intel_vrr_hw_value(crtc_state, vmin_vmax) - crtc_state->vrr.guardband;
+}
+
 /*
  * For fixed refresh rate mode Vmin, Vmax and Flipline all are set to
  * Vtotal value.
@@ -898,3 +904,53 @@ int intel_vrr_vmin_safe_window_end(const struct intel_crtc_state *crtc_state)
        return intel_vrr_vmin_vblank_start(crtc_state) -
               crtc_state->set_context_latency;
 }
+
+int intel_vrr_dcb_vmin_vblank_start_next(const struct intel_crtc_state *crtc_state)
+{
+       struct intel_display *display = to_intel_display(crtc_state);
+       enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+       u32 tmp = 0;
+
+       tmp = intel_de_read(display, TRANS_VRR_DCB_ADJ_FLIPLINE_CFG_LIVE(cpu_transcoder));
+
+       if (REG_FIELD_GET(VRR_DCB_ADJ_FLIPLINE_CNT_MASK, tmp) == 0)
+               return -EINVAL;
+
+       return intel_vrr_vblank_start(crtc_state, VRR_DCB_ADJ_FLIPLINE(tmp) + 1);
+}
+
+int intel_vrr_dcb_vmax_vblank_start_next(const struct intel_crtc_state *crtc_state)
+{
+       struct intel_display *display = to_intel_display(crtc_state);
+       enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+       u32 tmp = 0;
+
+       tmp = intel_de_read(display, TRANS_VRR_DCB_ADJ_VMAX_CFG_LIVE(cpu_transcoder));
+
+       if (REG_FIELD_GET(VRR_DCB_ADJ_VMAX_CNT_MASK, tmp) == 0)
+               return -EINVAL;
+
+       return intel_vrr_vblank_start(crtc_state, VRR_DCB_ADJ_VMAX(tmp) + 1);
+}
+
+int intel_vrr_dcb_vmin_vblank_start_final(const struct intel_crtc_state *crtc_state)
+{
+       struct intel_display *display = to_intel_display(crtc_state);
+       enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+       u32 tmp = 0;
+
+       tmp = intel_de_read(display, TRANS_VRR_DCB_FLIPLINE_LIVE(cpu_transcoder));
+
+       return intel_vrr_vblank_start(crtc_state, VRR_DCB_FLIPLINE(tmp) + 1);
+}
+
+int intel_vrr_dcb_vmax_vblank_start_final(const struct intel_crtc_state *crtc_state)
+{
+       struct intel_display *display = to_intel_display(crtc_state);
+       enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+       u32 tmp = 0;
+
+       tmp = intel_de_read(display, TRANS_VRR_DCB_VMAX_LIVE(cpu_transcoder));
+
+       return intel_vrr_vblank_start(crtc_state, VRR_DCB_VMAX(tmp) + 1);
+}

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.h b/drivers/gpu/drm/i915/display/intel_vrr.h
index bc9044621635a1ccf841add3c524088d6888fa37..66fb9ad846f25f2271943bd97663ceb2f438d305 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_vrr.h
+++ b/drivers/gpu/drm/i915/display/intel_vrr.h
@@ -43,4 +43,9 @@ bool intel_vrr_always_use_vrr_tg(struct intel_display *display);
 int intel_vrr_safe_window_start(const struct intel_crtc_state *crtc_state);
 int intel_vrr_vmin_safe_window_end(const struct intel_crtc_state *crtc_state);
 
+int intel_vrr_dcb_vmin_vblank_start_next(const struct intel_crtc_state *crtc_state);
+int intel_vrr_dcb_vmax_vblank_start_next(const struct intel_crtc_state *crtc_state);
+int intel_vrr_dcb_vmin_vblank_start_final(const struct intel_crtc_state *crtc_state);
+int intel_vrr_dcb_vmax_vblank_start_final(const struct intel_crtc_state *crtc_state);
+
 #endif /* __INTEL_VRR_H__ */