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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
45bool intel_vrr_is_in_range(struct intel_connector *connector, int vrefresh)
46{
47 const struct drm_display_info *info = &connector->base.display_info;
48
49 return intel_vrr_is_capable(connector) &&
50 vrefresh >= info->monitor_range.min_vfreq &&
51 vrefresh <= info->monitor_range.max_vfreq;
52}
53
54void
55intel_vrr_check_modeset(struct intel_atomic_state *state)
56{
57 int i;
58 struct intel_crtc_state *old_crtc_state, *new_crtc_state;
59 struct intel_crtc *crtc;
60
61 for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
62 new_crtc_state, i) {
63 if (new_crtc_state->uapi.vrr_enabled !=
64 old_crtc_state->uapi.vrr_enabled)
65 new_crtc_state->uapi.mode_changed = true;
66 }
67}
68
69/*
70 * Without VRR registers get latched at:
71 * vblank_start
72 *
73 * With VRR the earliest registers can get latched is:
74 * intel_vrr_vmin_vblank_start(), which if we want to maintain
75 * the correct min vtotal is >=vblank_start+1
76 *
77 * The latest point registers can get latched is the vmax decision boundary:
78 * intel_vrr_vmax_vblank_start()
79 *
80 * Between those two points the vblank exit starts (and hence registers get
81 * latched) ASAP after a push is sent.
82 *
83 * framestart_delay is programmable 1-4.
84 */
85static int intel_vrr_vblank_exit_length(const struct intel_crtc_state *crtc_state)
86{
87 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
88 struct drm_i915_private *i915 = to_i915(crtc->base.dev);
89
90 if (DISPLAY_VER(i915) >= 13)
91 return crtc_state->vrr.guardband;
92 else
93 /* The hw imposes the extra scanline before frame start */
94 return crtc_state->vrr.pipeline_full + crtc_state->framestart_delay + 1;
95}
96
97int intel_vrr_vmin_vblank_start(const struct intel_crtc_state *crtc_state)
98{
99 /* Min vblank actually determined by flipline that is always >=vmin+1 */
100 return crtc_state->vrr.vmin + 1 - intel_vrr_vblank_exit_length(crtc_state);
101}
102
103int intel_vrr_vmax_vblank_start(const struct intel_crtc_state *crtc_state)
104{
105 return crtc_state->vrr.vmax - intel_vrr_vblank_exit_length(crtc_state);
106}
107
108void
109intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
110 struct drm_connector_state *conn_state)
111{
112 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
113 struct drm_i915_private *i915 = to_i915(crtc->base.dev);
114 struct intel_connector *connector =
115 to_intel_connector(conn_state->connector);
116 struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
117 const struct drm_display_info *info = &connector->base.display_info;
118 int vmin, vmax;
119
120 if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
121 return;
122
123 crtc_state->vrr.in_range =
124 intel_vrr_is_in_range(connector, drm_mode_vrefresh(adjusted_mode));
125 if (!crtc_state->vrr.in_range)
126 return;
127
128 if (HAS_LRR(i915))
129 crtc_state->update_lrr = true;
130
131 vmin = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000,
132 adjusted_mode->crtc_htotal * info->monitor_range.max_vfreq);
133 vmax = adjusted_mode->crtc_clock * 1000 /
134 (adjusted_mode->crtc_htotal * info->monitor_range.min_vfreq);
135
136 vmin = max_t(int, vmin, adjusted_mode->crtc_vtotal);
137 vmax = max_t(int, vmax, adjusted_mode->crtc_vtotal);
138
139 if (vmin >= vmax)
140 return;
141
142 /*
143 * flipline determines the min vblank length the hardware will
144 * generate, and flipline>=vmin+1, hence we reduce vmin by one
145 * to make sure we can get the actual min vblank length.
146 */
147 crtc_state->vrr.vmin = vmin - 1;
148 crtc_state->vrr.vmax = vmax;
149
150 crtc_state->vrr.flipline = crtc_state->vrr.vmin + 1;
151
152 /*
153 * For XE_LPD+, we use guardband and pipeline override
154 * is deprecated.
155 */
156 if (DISPLAY_VER(i915) >= 13) {
157 crtc_state->vrr.guardband =
158 crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vblank_start;
159 } else {
160 crtc_state->vrr.pipeline_full =
161 min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vblank_start -
162 crtc_state->framestart_delay - 1);
163 }
164
165 if (crtc_state->uapi.vrr_enabled) {
166 crtc_state->vrr.enable = true;
167 crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
168 }
169}
170
171static u32 trans_vrr_ctl(const struct intel_crtc_state *crtc_state)
172{
173 struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
174
175 if (DISPLAY_VER(i915) >= 13)
176 return VRR_CTL_IGN_MAX_SHIFT | VRR_CTL_FLIP_LINE_EN |
177 XELPD_VRR_CTL_VRR_GUARDBAND(crtc_state->vrr.guardband);
178 else
179 return VRR_CTL_IGN_MAX_SHIFT | VRR_CTL_FLIP_LINE_EN |
180 VRR_CTL_PIPELINE_FULL(crtc_state->vrr.pipeline_full) |
181 VRR_CTL_PIPELINE_FULL_OVERRIDE;
182}
183
184void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
185{
186 struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
187 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
188
189 /*
190 * TRANS_SET_CONTEXT_LATENCY with VRR enabled
191 * requires this chicken bit on ADL/DG2.
192 */
193 if (DISPLAY_VER(dev_priv) == 13)
194 intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder),
195 0, PIPE_VBLANK_WITH_DELAY);
196
197 if (!crtc_state->vrr.flipline) {
198 intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder), 0);
199 return;
200 }
201
202 intel_de_write(dev_priv, TRANS_VRR_VMIN(cpu_transcoder), crtc_state->vrr.vmin - 1);
203 intel_de_write(dev_priv, TRANS_VRR_VMAX(cpu_transcoder), crtc_state->vrr.vmax - 1);
204 intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder), trans_vrr_ctl(crtc_state));
205 intel_de_write(dev_priv, TRANS_VRR_FLIPLINE(cpu_transcoder), crtc_state->vrr.flipline - 1);
206}
207
208void intel_vrr_send_push(const struct intel_crtc_state *crtc_state)
209{
210 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
211 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
212 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
213
214 if (!crtc_state->vrr.enable)
215 return;
216
217 intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder),
218 TRANS_PUSH_EN | TRANS_PUSH_SEND);
219}
220
221bool intel_vrr_is_push_sent(const struct intel_crtc_state *crtc_state)
222{
223 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
224 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
225 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
226
227 if (!crtc_state->vrr.enable)
228 return false;
229
230 return intel_de_read(dev_priv, TRANS_PUSH(cpu_transcoder)) & TRANS_PUSH_SEND;
231}
232
233void intel_vrr_enable(const struct intel_crtc_state *crtc_state)
234{
235 struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
236 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
237
238 if (!crtc_state->vrr.enable)
239 return;
240
241 intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder), TRANS_PUSH_EN);
242 intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder),
243 VRR_CTL_VRR_ENABLE | trans_vrr_ctl(crtc_state));
244}
245
246void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state)
247{
248 struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
249 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
250 enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
251
252 if (!old_crtc_state->vrr.enable)
253 return;
254
255 intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder),
256 trans_vrr_ctl(old_crtc_state));
257 intel_de_wait_for_clear(dev_priv, TRANS_VRR_STATUS(cpu_transcoder),
258 VRR_STATUS_VRR_EN_LIVE, 1000);
259 intel_de_write(dev_priv, TRANS_PUSH(cpu_transcoder), 0);
260}
261
262void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
263{
264 struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
265 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
266 u32 trans_vrr_ctl;
267
268 trans_vrr_ctl = intel_de_read(dev_priv, TRANS_VRR_CTL(cpu_transcoder));
269
270 crtc_state->vrr.enable = trans_vrr_ctl & VRR_CTL_VRR_ENABLE;
271
272 if (DISPLAY_VER(dev_priv) >= 13)
273 crtc_state->vrr.guardband =
274 REG_FIELD_GET(XELPD_VRR_CTL_VRR_GUARDBAND_MASK, trans_vrr_ctl);
275 else
276 if (trans_vrr_ctl & VRR_CTL_PIPELINE_FULL_OVERRIDE)
277 crtc_state->vrr.pipeline_full =
278 REG_FIELD_GET(VRR_CTL_PIPELINE_FULL_MASK, trans_vrr_ctl);
279
280 if (trans_vrr_ctl & VRR_CTL_FLIP_LINE_EN) {
281 crtc_state->vrr.flipline = intel_de_read(dev_priv, TRANS_VRR_FLIPLINE(cpu_transcoder)) + 1;
282 crtc_state->vrr.vmax = intel_de_read(dev_priv, TRANS_VRR_VMAX(cpu_transcoder)) + 1;
283 crtc_state->vrr.vmin = intel_de_read(dev_priv, TRANS_VRR_VMIN(cpu_transcoder)) + 1;
284 }
285
286 if (crtc_state->vrr.enable)
287 crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
288}