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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2020 Intel Corporation
4 *
5 */
6
7#include "i915_drv.h"
8#include "i915_reg.h"
9#include "intel_de.h"
10#include "intel_display_types.h"
11#include "intel_vrr.h"
12
13bool intel_vrr_is_capable(struct intel_connector *connector)
14{
15 const struct drm_display_info *info = &connector->base.display_info;
16 struct drm_i915_private *i915 = to_i915(connector->base.dev);
17 struct intel_dp *intel_dp;
18
19 /*
20 * DP Sink is capable of VRR video timings if
21 * Ignore MSA bit is set in DPCD.
22 * EDID monitor range also should be atleast 10 for reasonable
23 * Adaptive Sync or Variable Refresh Rate end user experience.
24 */
25 switch (connector->base.connector_type) {
26 case DRM_MODE_CONNECTOR_eDP:
27 if (!connector->panel.vbt.vrr)
28 return false;
29 fallthrough;
30 case DRM_MODE_CONNECTOR_DisplayPort:
31 intel_dp = intel_attached_dp(connector);
32
33 if (!drm_dp_sink_can_do_video_without_timing_msa(intel_dp->dpcd))
34 return false;
35
36 break;
37 default:
38 return false;
39 }
40
41 return HAS_VRR(i915) &&
42 info->monitor_range.max_vfreq - info->monitor_range.min_vfreq > 10;
43}
44
45void
46intel_vrr_check_modeset(struct intel_atomic_state *state)
47{
48 int i;
49 struct intel_crtc_state *old_crtc_state, *new_crtc_state;
50 struct intel_crtc *crtc;
51
52 for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
53 new_crtc_state, i) {
54 if (new_crtc_state->uapi.vrr_enabled !=
55 old_crtc_state->uapi.vrr_enabled)
56 new_crtc_state->uapi.mode_changed = true;
57 }
58}
59
60/*
61 * Without VRR registers get latched at:
62 * vblank_start
63 *
64 * With VRR the earliest registers can get latched is:
65 * intel_vrr_vmin_vblank_start(), which if we want to maintain
66 * the correct min vtotal is >=vblank_start+1
67 *
68 * The latest point registers can get latched is the vmax decision boundary:
69 * intel_vrr_vmax_vblank_start()
70 *
71 * Between those two points the vblank exit starts (and hence registers get
72 * latched) ASAP after a push is sent.
73 *
74 * framestart_delay is programmable 1-4.
75 */
76static int intel_vrr_vblank_exit_length(const struct intel_crtc_state *crtc_state)
77{
78 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
79 struct drm_i915_private *i915 = to_i915(crtc->base.dev);
80
81 /* The hw imposes the extra scanline before frame start */
82 if (DISPLAY_VER(i915) >= 13)
83 return crtc_state->vrr.guardband + crtc_state->framestart_delay + 1;
84 else
85 return crtc_state->vrr.pipeline_full + crtc_state->framestart_delay + 1;
86}
87
88int intel_vrr_vmin_vblank_start(const struct intel_crtc_state *crtc_state)
89{
90 /* Min vblank actually determined by flipline that is always >=vmin+1 */
91 return crtc_state->vrr.vmin + 1 - intel_vrr_vblank_exit_length(crtc_state);
92}
93
94int intel_vrr_vmax_vblank_start(const struct intel_crtc_state *crtc_state)
95{
96 return crtc_state->vrr.vmax - intel_vrr_vblank_exit_length(crtc_state);
97}
98
99void
100intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
101 struct drm_connector_state *conn_state)
102{
103 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
104 struct drm_i915_private *i915 = to_i915(crtc->base.dev);
105 struct intel_connector *connector =
106 to_intel_connector(conn_state->connector);
107 struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
108 const struct drm_display_info *info = &connector->base.display_info;
109 int vmin, vmax;
110
111 if (!intel_vrr_is_capable(connector))
112 return;
113
114 if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
115 return;
116
117 if (!crtc_state->uapi.vrr_enabled)
118 return;
119
120 vmin = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000,
121 adjusted_mode->crtc_htotal * info->monitor_range.max_vfreq);
122 vmax = adjusted_mode->crtc_clock * 1000 /
123 (adjusted_mode->crtc_htotal * info->monitor_range.min_vfreq);
124
125 vmin = max_t(int, vmin, adjusted_mode->crtc_vtotal);
126 vmax = max_t(int, vmax, adjusted_mode->crtc_vtotal);
127
128 if (vmin >= vmax)
129 return;
130
131 /*
132 * flipline determines the min vblank length the hardware will
133 * generate, and flipline>=vmin+1, hence we reduce vmin by one
134 * to make sure we can get the actual min vblank length.
135 */
136 crtc_state->vrr.vmin = vmin - 1;
137 crtc_state->vrr.vmax = vmax;
138 crtc_state->vrr.enable = true;
139
140 crtc_state->vrr.flipline = crtc_state->vrr.vmin + 1;
141
142 /*
143 * For XE_LPD+, we use guardband and pipeline override
144 * is deprecated.
145 */
146 if (DISPLAY_VER(i915) >= 13) {
147 /*
148 * FIXME: Subtract Window2 delay from below value.
149 *
150 * Window2 specifies time required to program DSB (Window2) in
151 * number of scan lines. Assuming 0 for no DSB.
152 */
153 crtc_state->vrr.guardband =
154 crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay;
155 } else {
156 /*
157 * FIXME: s/4/framestart_delay/ to get consistent
158 * earliest/latest points for register latching regardless
159 * of the framestart_delay used?
160 *
161 * FIXME: this really needs the extra scanline to provide consistent
162 * behaviour for all framestart_delay values. Otherwise with
163 * framestart_delay==4 we will end up extending the min vblank by
164 * one extra line.
165 */
166 crtc_state->vrr.pipeline_full =
167 min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay - 4 - 1);
168 }
169
170 crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
171}
172
173void intel_vrr_enable(struct intel_encoder *encoder,
174 const struct intel_crtc_state *crtc_state)
175{
176 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
177 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
178 u32 trans_vrr_ctl;
179
180 if (!crtc_state->vrr.enable)
181 return;
182
183 if (DISPLAY_VER(dev_priv) >= 13)
184 trans_vrr_ctl = VRR_CTL_VRR_ENABLE |
185 VRR_CTL_IGN_MAX_SHIFT | VRR_CTL_FLIP_LINE_EN |
186 XELPD_VRR_CTL_VRR_GUARDBAND(crtc_state->vrr.guardband);
187 else
188 trans_vrr_ctl = VRR_CTL_VRR_ENABLE |
189 VRR_CTL_IGN_MAX_SHIFT | VRR_CTL_FLIP_LINE_EN |
190 VRR_CTL_PIPELINE_FULL(crtc_state->vrr.pipeline_full) |
191 VRR_CTL_PIPELINE_FULL_OVERRIDE;
192
193 intel_de_write(dev_priv, TRANS_VRR_VMIN(cpu_transcoder), crtc_state->vrr.vmin - 1);
194 intel_de_write(dev_priv, TRANS_VRR_VMAX(cpu_transcoder), crtc_state->vrr.vmax - 1);
195 intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder), trans_vrr_ctl);
196 intel_de_write(dev_priv, TRANS_VRR_FLIPLINE(cpu_transcoder), crtc_state->vrr.flipline - 1);
197 intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder), TRANS_PUSH_EN);
198}
199
200void intel_vrr_send_push(const struct intel_crtc_state *crtc_state)
201{
202 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
203 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
204 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
205
206 if (!crtc_state->vrr.enable)
207 return;
208
209 intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder),
210 TRANS_PUSH_EN | TRANS_PUSH_SEND);
211}
212
213bool intel_vrr_is_push_sent(const struct intel_crtc_state *crtc_state)
214{
215 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
216 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
217 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
218
219 if (!crtc_state->vrr.enable)
220 return false;
221
222 return intel_de_read(dev_priv, TRANS_PUSH(cpu_transcoder)) & TRANS_PUSH_SEND;
223}
224
225void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state)
226{
227 struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
228 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
229 enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
230
231 if (!old_crtc_state->vrr.enable)
232 return;
233
234 intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder), 0);
235 intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder), 0);
236}
237
238void intel_vrr_get_config(struct intel_crtc *crtc,
239 struct intel_crtc_state *crtc_state)
240{
241 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
242 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
243 u32 trans_vrr_ctl;
244
245 trans_vrr_ctl = intel_de_read(dev_priv, TRANS_VRR_CTL(cpu_transcoder));
246 crtc_state->vrr.enable = trans_vrr_ctl & VRR_CTL_VRR_ENABLE;
247 if (!crtc_state->vrr.enable)
248 return;
249
250 if (DISPLAY_VER(dev_priv) >= 13)
251 crtc_state->vrr.guardband =
252 REG_FIELD_GET(XELPD_VRR_CTL_VRR_GUARDBAND_MASK, trans_vrr_ctl);
253 else
254 if (trans_vrr_ctl & VRR_CTL_PIPELINE_FULL_OVERRIDE)
255 crtc_state->vrr.pipeline_full =
256 REG_FIELD_GET(VRR_CTL_PIPELINE_FULL_MASK, trans_vrr_ctl);
257 if (trans_vrr_ctl & VRR_CTL_FLIP_LINE_EN)
258 crtc_state->vrr.flipline = intel_de_read(dev_priv, TRANS_VRR_FLIPLINE(cpu_transcoder)) + 1;
259 crtc_state->vrr.vmax = intel_de_read(dev_priv, TRANS_VRR_VMAX(cpu_transcoder)) + 1;
260 crtc_state->vrr.vmin = intel_de_read(dev_priv, TRANS_VRR_VMIN(cpu_transcoder)) + 1;
261
262 crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
263}