Compute Fixed Average Vtotal/CMRR with resepect to
userspace VRR enablement. Also calculate required
parameters in case of CMRR is enabled. During
intel_vrr_compute_config, CMRR is getting enabled
based on userspace has enabled Adaptive Sync Vtotal
mode (Legacy VRR) or not.
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display.c | 1 +
.../drm/i915/display/intel_display_device.h | 1 +
drivers/gpu/drm/i915/display/intel_vrr.c | 81 +++++++++++++++++--
3 files changed, 78 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index f5a69309e65a..d61790f8ebb4 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5479,6 +5479,7 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
PIPE_CONF_CHECK_I(vrr.guardband);
PIPE_CONF_CHECK_LLI(cmrr.cmrr_m);
PIPE_CONF_CHECK_LLI(cmrr.cmrr_n);
+ PIPE_CONF_CHECK_BOOL(cmrr.enable);
}
#undef PIPE_CONF_CHECK_X
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h
index 4299cc452e05..66cbc3a6bbe8 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.h
+++ b/drivers/gpu/drm/i915/display/intel_display_device.h
@@ -68,6 +68,7 @@ struct drm_printer;
#define HAS_TRANSCODER(i915, trans) ((DISPLAY_RUNTIME_INFO(i915)->cpu_transcoder_mask & \
BIT(trans)) != 0)
#define HAS_VRR(i915) (DISPLAY_VER(i915) >= 11)
+#define HAS_CMRR(i915) (DISPLAY_VER(i915) >= 20)
#define INTEL_NUM_PIPES(i915) (hweight8(DISPLAY_RUNTIME_INFO(i915)->pipe_mask))
#define I915_HAS_HOTPLUG(i915) (DISPLAY_INFO(i915)->has_hotplug)
#define OVERLAY_NEEDS_PHYSICAL(i915) (DISPLAY_INFO(i915)->overlay_needs_physical)
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 1e33661062b3..4a056a71b68d 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -105,6 +105,52 @@ 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);
}
+static int
+is_cmrr_frac_required(struct intel_crtc_state *crtc_state)
+{
+ int target_refresh_k, actual_refresh_k;
+ struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+
+ target_refresh_k = drm_mode_vrefresh(adjusted_mode) * 1000;
+ actual_refresh_k = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000,
+ adjusted_mode->crtc_htotal) * 1000;
+ actual_refresh_k /= adjusted_mode->crtc_vtotal;
+
+ if (actual_refresh_k == target_refresh_k)
+ return false;
+
+ return true;
+}
+
+static unsigned int
+cmrr_get_vtotal(struct intel_crtc_state *crtc_state)
+{
+ unsigned int muliplierM = 1, muliplierN = 1, vtotal;
+ unsigned int actual_refresh_rate, desired_refresh_rate;
+ unsigned long long actual_pixel_rate;
+ struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+
+ actual_refresh_rate = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000,
+ adjusted_mode->crtc_htotal) * 1000;
+ actual_refresh_rate /= adjusted_mode->crtc_vtotal;
+ desired_refresh_rate = drm_mode_vrefresh(adjusted_mode);
+ actual_pixel_rate = actual_refresh_rate * adjusted_mode->crtc_vtotal;
+ actual_pixel_rate = (actual_pixel_rate * adjusted_mode->crtc_htotal) / 1000;
+
+ if (is_cmrr_frac_required(crtc_state)) {
+ muliplierM = 1001;
+ muliplierN = 1000;
+ }
+
+ crtc_state->cmrr.cmrr_n = DIV_ROUND_UP(desired_refresh_rate *
+ adjusted_mode->crtc_htotal * muliplierN, muliplierM) * muliplierN;
+ vtotal = DIV_ROUND_UP(actual_pixel_rate * muliplierN, crtc_state->cmrr.cmrr_n);
+ crtc_state->cmrr.cmrr_m =
+ (actual_pixel_rate * muliplierM) % crtc_state->cmrr.cmrr_n;
+
+ return vtotal;
+}
+
void
intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
@@ -149,6 +195,27 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
crtc_state->vrr.flipline = crtc_state->vrr.vmin + 1;
+ /*
+ * When panel is VRR capable and userspace has
+ * not enabled adaptive sync mode then Fixed Average
+ * Vtotal mode should be enabled.
+ */
+ if (crtc_state->uapi.vrr_enabled) {
+ crtc_state->vrr.enable = true;
+ if (HAS_CMRR(i915))
+ crtc_state->cmrr.enable = false;
+ crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
+ } else {
+ crtc_state->vrr.enable = false;
+ if (HAS_CMRR(i915)) {
+ crtc_state->cmrr.enable = true;
+ crtc_state->vrr.vmax = cmrr_get_vtotal(crtc_state);
+ crtc_state->vrr.vmin = crtc_state->vrr.vmax;
+ crtc_state->vrr.flipline = crtc_state->vrr.vmin;
+ crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
+ }
+ }
+
/*
* For XE_LPD+, we use guardband and pipeline override
* is deprecated.
@@ -161,11 +228,6 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vblank_start -
crtc_state->framestart_delay - 1);
}
-
- if (crtc_state->uapi.vrr_enabled) {
- crtc_state->vrr.enable = true;
- crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
- }
}
static u32 trans_vrr_ctl(const struct intel_crtc_state *crtc_state)
@@ -295,6 +357,15 @@ void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
trans_vrr_ctl = intel_de_read(dev_priv, TRANS_VRR_CTL(cpu_transcoder));
+ if (HAS_CMRR(dev_priv)) {
+ crtc_state->cmrr.enable = (trans_vrr_ctl & VRR_CTL_CMRR_ENABLE) &&
+ (trans_vrr_ctl & VRR_CTL_VRR_ENABLE);
+ crtc_state->vrr.enable = trans_vrr_ctl & VRR_CTL_VRR_ENABLE &&
+ !(trans_vrr_ctl & VRR_CTL_CMRR_ENABLE);
+ } else {
+ crtc_state->vrr.enable = trans_vrr_ctl & VRR_CTL_VRR_ENABLE;
+ }
+
if (crtc_state->cmrr.enable) {
cmrr_n_hi = intel_de_read(dev_priv, TRANS_CMRR_N_HI(cpu_transcoder));
cmrr_n_lo = intel_de_read(dev_priv, TRANS_CMRR_N_LO(cpu_transcoder));
--
2.25.1
