[PATCH v9 05/17] drm/i915/vrr: Add DC Balance params to crtc_state

[Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>]

Add DC Balance params to crtc_state, also add state checker
params for related properties.

--v3:
- Seggregate crtc_state params with this patch. (Ankit)

--v4:
- Update commit message and header. (Ankit)
- Add +1 to VMIN and VMAX only when it is non-zero. (Ankit)

--v5:
- Add headers in sorted order. (Jani Nikula)

--v6:
- Add a separate function to get and check dc_balance params.
- Avoid repeatative use of MMIO read. (Ankit)

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c  |  7 ++++
 .../drm/i915/display/intel_display_types.h    |  7 ++++
 drivers/gpu/drm/i915/display/intel_vrr.c      | 32 +++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 04f5c488f399..db4f84cb8762 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5467,6 +5467,13 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 		PIPE_CONF_CHECK_LLI(cmrr.cmrr_m);
 		PIPE_CONF_CHECK_LLI(cmrr.cmrr_n);
 		PIPE_CONF_CHECK_BOOL(cmrr.enable);
+		PIPE_CONF_CHECK_I(vrr.dc_balance.vmin);
+		PIPE_CONF_CHECK_I(vrr.dc_balance.vmax);
+		PIPE_CONF_CHECK_I(vrr.dc_balance.guardband);
+		PIPE_CONF_CHECK_I(vrr.dc_balance.slope);
+		PIPE_CONF_CHECK_I(vrr.dc_balance.max_increase);
+		PIPE_CONF_CHECK_I(vrr.dc_balance.max_decrease);
+		PIPE_CONF_CHECK_I(vrr.dc_balance.vblank_target);
 	}
 
 	if (!fastset || intel_vrr_always_use_vrr_tg(display)) {
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 38702a9e0f50..8eb0ace7d918 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1357,6 +1357,13 @@ struct intel_crtc_state {
 		u8 pipeline_full;
 		u16 flipline, vmin, vmax, guardband;
 		u32 vsync_end, vsync_start;
+		struct {
+			bool enable;
+			u16 vmin, vmax;
+			u16 guardband, slope;
+			u16 max_increase, max_decrease;
+			u16 vblank_target;
+		} dc_balance;
 	} vrr;
 
 	/* Content Match Refresh Rate state */
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 7f0ead192777..650077eb280f 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -9,6 +9,7 @@
 #include "intel_de.h"
 #include "intel_display_regs.h"
 #include "intel_display_types.h"
+#include "intel_dmc_regs.h"
 #include "intel_dp.h"
 #include "intel_psr.h"
 #include "intel_vrr.h"
@@ -785,6 +786,35 @@ bool intel_vrr_is_fixed_rr(const struct intel_crtc_state *crtc_state)
 	       crtc_state->vrr.flipline == crtc_state->vrr.vmin;
 }
 
+static
+void intel_vrr_get_dc_balance_config(struct intel_crtc_state *crtc_state)
+{
+	u32 reg_val;
+	struct intel_display *display = to_intel_display(crtc_state);
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	enum pipe pipe = crtc->pipe;
+
+	if (!HAS_VRR_DC_BALANCE(display))
+		return;
+
+	reg_val = intel_de_read(display, PIPEDMC_DCB_VMIN(pipe));
+	crtc_state->vrr.dc_balance.vmin = reg_val ? reg_val + 1 : 0;
+
+	reg_val = intel_de_read(display, PIPEDMC_DCB_VMAX(pipe));
+	crtc_state->vrr.dc_balance.vmax = reg_val ? reg_val + 1 : 0;
+
+	crtc_state->vrr.dc_balance.guardband =
+		intel_de_read(display, PIPEDMC_DCB_GUARDBAND(pipe));
+	crtc_state->vrr.dc_balance.max_increase =
+		intel_de_read(display, PIPEDMC_DCB_MAX_INCREASE(pipe));
+	crtc_state->vrr.dc_balance.max_decrease =
+		intel_de_read(display, PIPEDMC_DCB_MAX_DECREASE(pipe));
+	crtc_state->vrr.dc_balance.slope =
+		intel_de_read(display, PIPEDMC_DCB_SLOPE(pipe));
+	crtc_state->vrr.dc_balance.vblank_target =
+		intel_de_read(display, PIPEDMC_DCB_VBLANK(pipe));
+}
+
 void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
@@ -866,6 +896,8 @@ void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
 	else
 		crtc_state->vrr.enable = vrr_enable;
 
+	intel_vrr_get_dc_balance_config(crtc_state);
+
 	/*
 	 * #TODO: For Both VRR and CMRR the flag I915_MODE_FLAG_VRR is set for mode_flags.
 	 * Since CMRR is currently disabled, set this flag for VRR for now.
-- 
2.48.1