1/*
2 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Ke Yu
25 * Zhiyuan Lv <zhiyuan.lv@intel.com>
26 *
27 * Contributors:
28 * Terrence Xu <terrence.xu@intel.com>
29 * Changbin Du <changbin.du@intel.com>
30 * Bing Niu <bing.niu@intel.com>
31 * Zhi Wang <zhi.a.wang@intel.com>
32 *
33 */
34
35#include <drm/display/drm_dp.h>
36#include <drm/drm_print.h>
37
38#include "i915_drv.h"
39#include "i915_reg.h"
40#include "display/intel_display_regs.h"
41#include "gvt.h"
42
43#include "display/bxt_dpio_phy_regs.h"
44#include "display/i9xx_plane_regs.h"
45#include "display/intel_crt_regs.h"
46#include "display/intel_cursor_regs.h"
47#include "display/intel_display.h"
48#include "display/intel_display_core.h"
49#include "display/intel_dpio_phy.h"
50#include "display/intel_sprite_regs.h"
51
52static int get_edp_pipe(struct intel_vgpu *vgpu)
53{
54 u32 data = vgpu_vreg(vgpu, _TRANS_DDI_FUNC_CTL_EDP);
55 int pipe = -1;
56
57 switch (data & TRANS_DDI_EDP_INPUT_MASK) {
58 case TRANS_DDI_EDP_INPUT_A_ON:
59 case TRANS_DDI_EDP_INPUT_A_ONOFF:
60 pipe = PIPE_A;
61 break;
62 case TRANS_DDI_EDP_INPUT_B_ONOFF:
63 pipe = PIPE_B;
64 break;
65 case TRANS_DDI_EDP_INPUT_C_ONOFF:
66 pipe = PIPE_C;
67 break;
68 }
69 return pipe;
70}
71
72static int edp_pipe_is_enabled(struct intel_vgpu *vgpu)
73{
74 struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
75 struct intel_display *display = dev_priv->display;
76
77 if (!(vgpu_vreg_t(vgpu, TRANSCONF(display, TRANSCODER_EDP)) & TRANSCONF_ENABLE))
78 return 0;
79
80 if (!(vgpu_vreg(vgpu, _TRANS_DDI_FUNC_CTL_EDP) & TRANS_DDI_FUNC_ENABLE))
81 return 0;
82 return 1;
83}
84
85int pipe_is_enabled(struct intel_vgpu *vgpu, int pipe)
86{
87 struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
88 struct intel_display *display = dev_priv->display;
89
90 if (drm_WARN_ON(&dev_priv->drm,
91 pipe < PIPE_A || pipe >= I915_MAX_PIPES))
92 return -EINVAL;
93
94 if (vgpu_vreg_t(vgpu, TRANSCONF(display, pipe)) & TRANSCONF_ENABLE)
95 return 1;
96
97 if (edp_pipe_is_enabled(vgpu) &&
98 get_edp_pipe(vgpu) == pipe)
99 return 1;
100 return 0;
101}
102
103static const unsigned char virtual_dp_monitor_edid[GVT_EDID_NUM][EDID_SIZE] = {
104 {
105/* EDID with 1024x768 as its resolution */
106 /*Header*/
107 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
108 /* Vendor & Product Identification */
109 0x22, 0xf0, 0x54, 0x29, 0x00, 0x00, 0x00, 0x00, 0x04, 0x17,
110 /* Version & Revision */
111 0x01, 0x04,
112 /* Basic Display Parameters & Features */
113 0xa5, 0x34, 0x20, 0x78, 0x23,
114 /* Color Characteristics */
115 0xfc, 0x81, 0xa4, 0x55, 0x4d, 0x9d, 0x25, 0x12, 0x50, 0x54,
116 /* Established Timings: maximum resolution is 1024x768 */
117 0x21, 0x08, 0x00,
118 /* Standard Timings. All invalid */
119 0x00, 0xc0, 0x00, 0xc0, 0x00, 0x40, 0x00, 0x80, 0x00, 0x00,
120 0x00, 0x40, 0x00, 0x00, 0x00, 0x01,
121 /* 18 Byte Data Blocks 1: invalid */
122 0x00, 0x00, 0x80, 0xa0, 0x70, 0xb0,
123 0x23, 0x40, 0x30, 0x20, 0x36, 0x00, 0x06, 0x44, 0x21, 0x00, 0x00, 0x1a,
124 /* 18 Byte Data Blocks 2: invalid */
125 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 0x3c, 0x18, 0x50, 0x11, 0x00, 0x0a,
126 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
127 /* 18 Byte Data Blocks 3: invalid */
128 0x00, 0x00, 0x00, 0xfc, 0x00, 0x48,
129 0x50, 0x20, 0x5a, 0x52, 0x32, 0x34, 0x34, 0x30, 0x77, 0x0a, 0x20, 0x20,
130 /* 18 Byte Data Blocks 4: invalid */
131 0x00, 0x00, 0x00, 0xff, 0x00, 0x43, 0x4e, 0x34, 0x33, 0x30, 0x34, 0x30,
132 0x44, 0x58, 0x51, 0x0a, 0x20, 0x20,
133 /* Extension Block Count */
134 0x00,
135 /* Checksum */
136 0xef,
137 },
138 {
139/* EDID with 1920x1200 as its resolution */
140 /*Header*/
141 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
142 /* Vendor & Product Identification */
143 0x22, 0xf0, 0x54, 0x29, 0x00, 0x00, 0x00, 0x00, 0x04, 0x17,
144 /* Version & Revision */
145 0x01, 0x04,
146 /* Basic Display Parameters & Features */
147 0xa5, 0x34, 0x20, 0x78, 0x23,
148 /* Color Characteristics */
149 0xfc, 0x81, 0xa4, 0x55, 0x4d, 0x9d, 0x25, 0x12, 0x50, 0x54,
150 /* Established Timings: maximum resolution is 1024x768 */
151 0x21, 0x08, 0x00,
152 /*
153 * Standard Timings.
154 * below new resolutions can be supported:
155 * 1920x1080, 1280x720, 1280x960, 1280x1024,
156 * 1440x900, 1600x1200, 1680x1050
157 */
158 0xd1, 0xc0, 0x81, 0xc0, 0x81, 0x40, 0x81, 0x80, 0x95, 0x00,
159 0xa9, 0x40, 0xb3, 0x00, 0x01, 0x01,
160 /* 18 Byte Data Blocks 1: max resolution is 1920x1200 */
161 0x28, 0x3c, 0x80, 0xa0, 0x70, 0xb0,
162 0x23, 0x40, 0x30, 0x20, 0x36, 0x00, 0x06, 0x44, 0x21, 0x00, 0x00, 0x1a,
163 /* 18 Byte Data Blocks 2: invalid */
164 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 0x3c, 0x18, 0x50, 0x11, 0x00, 0x0a,
165 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
166 /* 18 Byte Data Blocks 3: invalid */
167 0x00, 0x00, 0x00, 0xfc, 0x00, 0x48,
168 0x50, 0x20, 0x5a, 0x52, 0x32, 0x34, 0x34, 0x30, 0x77, 0x0a, 0x20, 0x20,
169 /* 18 Byte Data Blocks 4: invalid */
170 0x00, 0x00, 0x00, 0xff, 0x00, 0x43, 0x4e, 0x34, 0x33, 0x30, 0x34, 0x30,
171 0x44, 0x58, 0x51, 0x0a, 0x20, 0x20,
172 /* Extension Block Count */
173 0x00,
174 /* Checksum */
175 0x45,
176 },
177};
178
179#define DPCD_HEADER_SIZE 0xb
180
181/* let the virtual display supports DP1.2 */
182static u8 dpcd_fix_data[DPCD_HEADER_SIZE] = {
183 0x12, 0x014, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
184};
185
186static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
187{
188 struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
189 struct intel_display *display = dev_priv->display;
190 int pipe;
191
192 if (IS_BROXTON(dev_priv)) {
193 enum transcoder trans;
194 enum port port;
195
196 /* Clear PIPE, DDI, PHY, HPD before setting new */
197 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) &=
198 ~(GEN8_DE_PORT_HOTPLUG(HPD_PORT_A) |
199 GEN8_DE_PORT_HOTPLUG(HPD_PORT_B) |
200 GEN8_DE_PORT_HOTPLUG(HPD_PORT_C));
201
202 for_each_pipe(display, pipe) {
203 vgpu_vreg_t(vgpu, TRANSCONF(display, pipe)) &=
204 ~(TRANSCONF_ENABLE | TRANSCONF_STATE_ENABLE);
205 vgpu_vreg_t(vgpu, DSPCNTR(display, pipe)) &= ~DISP_ENABLE;
206 vgpu_vreg_t(vgpu, SPRCTL(pipe)) &= ~SPRITE_ENABLE;
207 vgpu_vreg_t(vgpu, CURCNTR(display, pipe)) &= ~MCURSOR_MODE_MASK;
208 vgpu_vreg_t(vgpu, CURCNTR(display, pipe)) |= MCURSOR_MODE_DISABLE;
209 }
210
211 for (trans = TRANSCODER_A; trans <= TRANSCODER_EDP; trans++) {
212 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, trans)) &=
213 ~(TRANS_DDI_BPC_MASK | TRANS_DDI_MODE_SELECT_MASK |
214 TRANS_DDI_PORT_MASK | TRANS_DDI_FUNC_ENABLE);
215 }
216 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) &=
217 ~(TRANS_DDI_BPC_MASK | TRANS_DDI_MODE_SELECT_MASK |
218 TRANS_DDI_PORT_MASK);
219
220 for (port = PORT_A; port <= PORT_C; port++) {
221 vgpu_vreg_t(vgpu, BXT_PHY_CTL(port)) &=
222 ~BXT_PHY_LANE_ENABLED;
223 vgpu_vreg_t(vgpu, BXT_PHY_CTL(port)) |=
224 (BXT_PHY_CMNLANE_POWERDOWN_ACK |
225 BXT_PHY_LANE_POWERDOWN_ACK);
226
227 vgpu_vreg_t(vgpu, BXT_PORT_PLL_ENABLE(port)) &=
228 ~(PORT_PLL_POWER_STATE | PORT_PLL_POWER_ENABLE |
229 PORT_PLL_REF_SEL | PORT_PLL_LOCK |
230 PORT_PLL_ENABLE);
231
232 vgpu_vreg_t(vgpu, DDI_BUF_CTL(port)) &=
233 ~(DDI_INIT_DISPLAY_DETECTED |
234 DDI_BUF_CTL_ENABLE);
235 vgpu_vreg_t(vgpu, DDI_BUF_CTL(port)) |= DDI_BUF_IS_IDLE;
236 }
237 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) &=
238 ~(PORTA_HOTPLUG_ENABLE | PORTA_HOTPLUG_STATUS_MASK);
239 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) &=
240 ~(PORTB_HOTPLUG_ENABLE | PORTB_HOTPLUG_STATUS_MASK);
241 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) &=
242 ~(PORTC_HOTPLUG_ENABLE | PORTC_HOTPLUG_STATUS_MASK);
243 /* No hpd_invert set in vgpu vbt, need to clear invert mask */
244 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) &= ~BXT_DDI_HPD_INVERT_MASK;
245 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) &= ~BXT_DE_PORT_HOTPLUG_MASK;
246
247 vgpu_vreg_t(vgpu, BXT_P_CR_GT_DISP_PWRON) &= ~(BIT(0) | BIT(1));
248 vgpu_vreg_t(vgpu, BXT_PORT_CL1CM_DW0(DPIO_PHY0)) &=
249 ~PHY_POWER_GOOD;
250 vgpu_vreg_t(vgpu, BXT_PORT_CL1CM_DW0(DPIO_PHY1)) &=
251 ~PHY_POWER_GOOD;
252 vgpu_vreg_t(vgpu, BXT_PHY_CTL_FAMILY(DPIO_PHY0)) &= ~BIT(30);
253 vgpu_vreg_t(vgpu, BXT_PHY_CTL_FAMILY(DPIO_PHY1)) &= ~BIT(30);
254
255 vgpu_vreg_t(vgpu, SFUSE_STRAP) &= ~SFUSE_STRAP_DDIB_DETECTED;
256 vgpu_vreg_t(vgpu, SFUSE_STRAP) &= ~SFUSE_STRAP_DDIC_DETECTED;
257
258 /*
259 * Only 1 PIPE enabled in current vGPU display and PIPE_A is
260 * tied to TRANSCODER_A in HW, so it's safe to assume PIPE_A,
261 * TRANSCODER_A can be enabled. PORT_x depends on the input of
262 * setup_virtual_dp_monitor.
263 */
264 vgpu_vreg_t(vgpu, TRANSCONF(display, TRANSCODER_A)) |= TRANSCONF_ENABLE;
265 vgpu_vreg_t(vgpu, TRANSCONF(display, TRANSCODER_A)) |= TRANSCONF_STATE_ENABLE;
266
267 /*
268 * Golden M/N are calculated based on:
269 * 24 bpp, 4 lanes, 154000 pixel clk (from virtual EDID),
270 * DP link clk 1620 MHz and non-constant_n.
271 * TODO: calculate DP link symbol clk and stream clk m/n.
272 */
273 vgpu_vreg_t(vgpu, PIPE_DATA_M1(display, TRANSCODER_A)) = TU_SIZE(64);
274 vgpu_vreg_t(vgpu, PIPE_DATA_M1(display, TRANSCODER_A)) |= 0x5b425e;
275 vgpu_vreg_t(vgpu, PIPE_DATA_N1(display, TRANSCODER_A)) = 0x800000;
276 vgpu_vreg_t(vgpu, PIPE_LINK_M1(display, TRANSCODER_A)) = 0x3cd6e;
277 vgpu_vreg_t(vgpu, PIPE_LINK_N1(display, TRANSCODER_A)) = 0x80000;
278
279 /* Enable per-DDI/PORT vreg */
280 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_A)) {
281 vgpu_vreg_t(vgpu, BXT_P_CR_GT_DISP_PWRON) |= BIT(1);
282 vgpu_vreg_t(vgpu, BXT_PORT_CL1CM_DW0(DPIO_PHY1)) |=
283 PHY_POWER_GOOD;
284 vgpu_vreg_t(vgpu, BXT_PHY_CTL_FAMILY(DPIO_PHY1)) |=
285 BIT(30);
286 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_A)) |=
287 BXT_PHY_LANE_ENABLED;
288 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_A)) &=
289 ~(BXT_PHY_CMNLANE_POWERDOWN_ACK |
290 BXT_PHY_LANE_POWERDOWN_ACK);
291 vgpu_vreg_t(vgpu, BXT_PORT_PLL_ENABLE(PORT_A)) |=
292 (PORT_PLL_POWER_STATE | PORT_PLL_POWER_ENABLE |
293 PORT_PLL_REF_SEL | PORT_PLL_LOCK |
294 PORT_PLL_ENABLE);
295 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_A)) |=
296 (DDI_BUF_CTL_ENABLE | DDI_INIT_DISPLAY_DETECTED);
297 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_A)) &=
298 ~DDI_BUF_IS_IDLE;
299 vgpu_vreg_t(vgpu,
300 TRANS_DDI_FUNC_CTL(display, TRANSCODER_EDP)) |=
301 (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
302 TRANS_DDI_FUNC_ENABLE);
303 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
304 PORTA_HOTPLUG_ENABLE;
305 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) |=
306 GEN8_DE_PORT_HOTPLUG(HPD_PORT_A);
307 }
308
309 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_B)) {
310 vgpu_vreg_t(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDIB_DETECTED;
311 vgpu_vreg_t(vgpu, BXT_P_CR_GT_DISP_PWRON) |= BIT(0);
312 vgpu_vreg_t(vgpu, BXT_PORT_CL1CM_DW0(DPIO_PHY0)) |=
313 PHY_POWER_GOOD;
314 vgpu_vreg_t(vgpu, BXT_PHY_CTL_FAMILY(DPIO_PHY0)) |=
315 BIT(30);
316 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_B)) |=
317 BXT_PHY_LANE_ENABLED;
318 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_B)) &=
319 ~(BXT_PHY_CMNLANE_POWERDOWN_ACK |
320 BXT_PHY_LANE_POWERDOWN_ACK);
321 vgpu_vreg_t(vgpu, BXT_PORT_PLL_ENABLE(PORT_B)) |=
322 (PORT_PLL_POWER_STATE | PORT_PLL_POWER_ENABLE |
323 PORT_PLL_REF_SEL | PORT_PLL_LOCK |
324 PORT_PLL_ENABLE);
325 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_B)) |=
326 DDI_BUF_CTL_ENABLE;
327 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_B)) &=
328 ~DDI_BUF_IS_IDLE;
329 vgpu_vreg_t(vgpu,
330 TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) |=
331 (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
332 (PORT_B << TRANS_DDI_PORT_SHIFT) |
333 TRANS_DDI_FUNC_ENABLE);
334 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
335 PORTB_HOTPLUG_ENABLE;
336 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) |=
337 GEN8_DE_PORT_HOTPLUG(HPD_PORT_B);
338 }
339
340 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_C)) {
341 vgpu_vreg_t(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDIC_DETECTED;
342 vgpu_vreg_t(vgpu, BXT_P_CR_GT_DISP_PWRON) |= BIT(0);
343 vgpu_vreg_t(vgpu, BXT_PORT_CL1CM_DW0(DPIO_PHY0)) |=
344 PHY_POWER_GOOD;
345 vgpu_vreg_t(vgpu, BXT_PHY_CTL_FAMILY(DPIO_PHY0)) |=
346 BIT(30);
347 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_C)) |=
348 BXT_PHY_LANE_ENABLED;
349 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_C)) &=
350 ~(BXT_PHY_CMNLANE_POWERDOWN_ACK |
351 BXT_PHY_LANE_POWERDOWN_ACK);
352 vgpu_vreg_t(vgpu, BXT_PORT_PLL_ENABLE(PORT_C)) |=
353 (PORT_PLL_POWER_STATE | PORT_PLL_POWER_ENABLE |
354 PORT_PLL_REF_SEL | PORT_PLL_LOCK |
355 PORT_PLL_ENABLE);
356 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_C)) |=
357 DDI_BUF_CTL_ENABLE;
358 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_C)) &=
359 ~DDI_BUF_IS_IDLE;
360 vgpu_vreg_t(vgpu,
361 TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) |=
362 (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
363 (PORT_B << TRANS_DDI_PORT_SHIFT) |
364 TRANS_DDI_FUNC_ENABLE);
365 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
366 PORTC_HOTPLUG_ENABLE;
367 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) |=
368 GEN8_DE_PORT_HOTPLUG(HPD_PORT_C);
369 }
370
371 return;
372 }
373
374 vgpu_vreg_t(vgpu, SDEISR) &= ~(SDE_PORTB_HOTPLUG_CPT |
375 SDE_PORTC_HOTPLUG_CPT |
376 SDE_PORTD_HOTPLUG_CPT);
377
378 if (IS_SKYLAKE(dev_priv) ||
379 IS_KABYLAKE(dev_priv) ||
380 IS_COFFEELAKE(dev_priv) ||
381 IS_COMETLAKE(dev_priv)) {
382 vgpu_vreg_t(vgpu, SDEISR) &= ~(SDE_PORTA_HOTPLUG_SPT |
383 SDE_PORTE_HOTPLUG_SPT);
384 vgpu_vreg_t(vgpu, SKL_FUSE_STATUS) |=
385 SKL_FUSE_DOWNLOAD_STATUS |
386 SKL_FUSE_PG_DIST_STATUS(SKL_PG0) |
387 SKL_FUSE_PG_DIST_STATUS(SKL_PG1) |
388 SKL_FUSE_PG_DIST_STATUS(SKL_PG2);
389 /*
390 * Only 1 PIPE enabled in current vGPU display and PIPE_A is
391 * tied to TRANSCODER_A in HW, so it's safe to assume PIPE_A,
392 * TRANSCODER_A can be enabled. PORT_x depends on the input of
393 * setup_virtual_dp_monitor, we can bind DPLL0 to any PORT_x
394 * so we fixed to DPLL0 here.
395 * Setup DPLL0: DP link clk 1620 MHz, non SSC, DP Mode
396 */
397 vgpu_vreg_t(vgpu, DPLL_CTRL1) =
398 DPLL_CTRL1_OVERRIDE(DPLL_ID_SKL_DPLL0);
399 vgpu_vreg_t(vgpu, DPLL_CTRL1) |=
400 DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1620, DPLL_ID_SKL_DPLL0);
401 vgpu_vreg_t(vgpu, LCPLL1_CTL) =
402 LCPLL_PLL_ENABLE | LCPLL_PLL_LOCK;
403 vgpu_vreg_t(vgpu, DPLL_STATUS) = DPLL_LOCK(DPLL_ID_SKL_DPLL0);
404 /*
405 * Golden M/N are calculated based on:
406 * 24 bpp, 4 lanes, 154000 pixel clk (from virtual EDID),
407 * DP link clk 1620 MHz and non-constant_n.
408 * TODO: calculate DP link symbol clk and stream clk m/n.
409 */
410 vgpu_vreg_t(vgpu, PIPE_DATA_M1(display, TRANSCODER_A)) = TU_SIZE(64);
411 vgpu_vreg_t(vgpu, PIPE_DATA_M1(display, TRANSCODER_A)) |= 0x5b425e;
412 vgpu_vreg_t(vgpu, PIPE_DATA_N1(display, TRANSCODER_A)) = 0x800000;
413 vgpu_vreg_t(vgpu, PIPE_LINK_M1(display, TRANSCODER_A)) = 0x3cd6e;
414 vgpu_vreg_t(vgpu, PIPE_LINK_N1(display, TRANSCODER_A)) = 0x80000;
415 }
416
417 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_B)) {
418 vgpu_vreg_t(vgpu, DPLL_CTRL2) &=
419 ~DPLL_CTRL2_DDI_CLK_OFF(PORT_B);
420 vgpu_vreg_t(vgpu, DPLL_CTRL2) |=
421 DPLL_CTRL2_DDI_CLK_SEL(DPLL_ID_SKL_DPLL0, PORT_B);
422 vgpu_vreg_t(vgpu, DPLL_CTRL2) |=
423 DPLL_CTRL2_DDI_SEL_OVERRIDE(PORT_B);
424 vgpu_vreg_t(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDIB_DETECTED;
425 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) &=
426 ~(TRANS_DDI_BPC_MASK | TRANS_DDI_MODE_SELECT_MASK |
427 TRANS_DDI_PORT_MASK);
428 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) |=
429 (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
430 (PORT_B << TRANS_DDI_PORT_SHIFT) |
431 TRANS_DDI_FUNC_ENABLE);
432 if (IS_BROADWELL(dev_priv)) {
433 vgpu_vreg_t(vgpu, PORT_CLK_SEL(PORT_B)) &=
434 ~PORT_CLK_SEL_MASK;
435 vgpu_vreg_t(vgpu, PORT_CLK_SEL(PORT_B)) |=
436 PORT_CLK_SEL_LCPLL_810;
437 }
438 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_B)) |= DDI_BUF_CTL_ENABLE;
439 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_B)) &= ~DDI_BUF_IS_IDLE;
440 vgpu_vreg_t(vgpu, SDEISR) |= SDE_PORTB_HOTPLUG_CPT;
441 }
442
443 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_C)) {
444 vgpu_vreg_t(vgpu, DPLL_CTRL2) &=
445 ~DPLL_CTRL2_DDI_CLK_OFF(PORT_C);
446 vgpu_vreg_t(vgpu, DPLL_CTRL2) |=
447 DPLL_CTRL2_DDI_CLK_SEL(DPLL_ID_SKL_DPLL0, PORT_C);
448 vgpu_vreg_t(vgpu, DPLL_CTRL2) |=
449 DPLL_CTRL2_DDI_SEL_OVERRIDE(PORT_C);
450 vgpu_vreg_t(vgpu, SDEISR) |= SDE_PORTC_HOTPLUG_CPT;
451 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) &=
452 ~(TRANS_DDI_BPC_MASK | TRANS_DDI_MODE_SELECT_MASK |
453 TRANS_DDI_PORT_MASK);
454 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) |=
455 (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
456 (PORT_C << TRANS_DDI_PORT_SHIFT) |
457 TRANS_DDI_FUNC_ENABLE);
458 if (IS_BROADWELL(dev_priv)) {
459 vgpu_vreg_t(vgpu, PORT_CLK_SEL(PORT_C)) &=
460 ~PORT_CLK_SEL_MASK;
461 vgpu_vreg_t(vgpu, PORT_CLK_SEL(PORT_C)) |=
462 PORT_CLK_SEL_LCPLL_810;
463 }
464 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_C)) |= DDI_BUF_CTL_ENABLE;
465 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_C)) &= ~DDI_BUF_IS_IDLE;
466 vgpu_vreg_t(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDIC_DETECTED;
467 }
468
469 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_D)) {
470 vgpu_vreg_t(vgpu, DPLL_CTRL2) &=
471 ~DPLL_CTRL2_DDI_CLK_OFF(PORT_D);
472 vgpu_vreg_t(vgpu, DPLL_CTRL2) |=
473 DPLL_CTRL2_DDI_CLK_SEL(DPLL_ID_SKL_DPLL0, PORT_D);
474 vgpu_vreg_t(vgpu, DPLL_CTRL2) |=
475 DPLL_CTRL2_DDI_SEL_OVERRIDE(PORT_D);
476 vgpu_vreg_t(vgpu, SDEISR) |= SDE_PORTD_HOTPLUG_CPT;
477 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) &=
478 ~(TRANS_DDI_BPC_MASK | TRANS_DDI_MODE_SELECT_MASK |
479 TRANS_DDI_PORT_MASK);
480 vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(display, TRANSCODER_A)) |=
481 (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
482 (PORT_D << TRANS_DDI_PORT_SHIFT) |
483 TRANS_DDI_FUNC_ENABLE);
484 if (IS_BROADWELL(dev_priv)) {
485 vgpu_vreg_t(vgpu, PORT_CLK_SEL(PORT_D)) &=
486 ~PORT_CLK_SEL_MASK;
487 vgpu_vreg_t(vgpu, PORT_CLK_SEL(PORT_D)) |=
488 PORT_CLK_SEL_LCPLL_810;
489 }
490 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_D)) |= DDI_BUF_CTL_ENABLE;
491 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_D)) &= ~DDI_BUF_IS_IDLE;
492 vgpu_vreg_t(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDID_DETECTED;
493 }
494
495 if ((IS_SKYLAKE(dev_priv) ||
496 IS_KABYLAKE(dev_priv) ||
497 IS_COFFEELAKE(dev_priv) ||
498 IS_COMETLAKE(dev_priv)) &&
499 intel_vgpu_has_monitor_on_port(vgpu, PORT_E)) {
500 vgpu_vreg_t(vgpu, SDEISR) |= SDE_PORTE_HOTPLUG_SPT;
501 }
502
503 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_A)) {
504 if (IS_BROADWELL(dev_priv))
505 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) |=
506 GEN8_DE_PORT_HOTPLUG(HPD_PORT_A);
507 else
508 vgpu_vreg_t(vgpu, SDEISR) |= SDE_PORTA_HOTPLUG_SPT;
509
510 vgpu_vreg_t(vgpu, DDI_BUF_CTL(PORT_A)) |= DDI_INIT_DISPLAY_DETECTED;
511 }
512
513 /* Clear host CRT status, so guest couldn't detect this host CRT. */
514 if (IS_BROADWELL(dev_priv))
515 vgpu_vreg_t(vgpu, PCH_ADPA) &= ~ADPA_CRT_HOTPLUG_MONITOR_MASK;
516
517 /* Disable Primary/Sprite/Cursor plane */
518 for_each_pipe(display, pipe) {
519 vgpu_vreg_t(vgpu, DSPCNTR(display, pipe)) &= ~DISP_ENABLE;
520 vgpu_vreg_t(vgpu, SPRCTL(pipe)) &= ~SPRITE_ENABLE;
521 vgpu_vreg_t(vgpu, CURCNTR(display, pipe)) &= ~MCURSOR_MODE_MASK;
522 vgpu_vreg_t(vgpu, CURCNTR(display, pipe)) |= MCURSOR_MODE_DISABLE;
523 }
524
525 vgpu_vreg_t(vgpu, TRANSCONF(display, TRANSCODER_A)) |= TRANSCONF_ENABLE;
526}
527
528static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)
529{
530 struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);
531
532 kfree(objp: port->edid);
533 port->edid = NULL;
534
535 kfree(objp: port->dpcd);
536 port->dpcd = NULL;
537}
538
539static enum hrtimer_restart vblank_timer_fn(struct hrtimer *data)
540{
541 struct intel_vgpu_vblank_timer *vblank_timer;
542 struct intel_vgpu *vgpu;
543
544 vblank_timer = container_of(data, struct intel_vgpu_vblank_timer, timer);
545 vgpu = container_of(vblank_timer, struct intel_vgpu, vblank_timer);
546
547 /* Set vblank emulation request per-vGPU bit */
548 intel_gvt_request_service(gvt: vgpu->gvt,
549 service: INTEL_GVT_REQUEST_EMULATE_VBLANK + vgpu->id);
550 hrtimer_add_expires_ns(timer: &vblank_timer->timer, ns: vblank_timer->period);
551 return HRTIMER_RESTART;
552}
553
554static int setup_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num,
555 int type, unsigned int resolution)
556{
557 struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
558 struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);
559 struct intel_vgpu_vblank_timer *vblank_timer = &vgpu->vblank_timer;
560
561 if (drm_WARN_ON(&i915->drm, resolution >= GVT_EDID_NUM))
562 return -EINVAL;
563
564 port->edid = kzalloc(sizeof(*(port->edid)), GFP_KERNEL);
565 if (!port->edid)
566 return -ENOMEM;
567
568 port->dpcd = kzalloc(sizeof(*(port->dpcd)), GFP_KERNEL);
569 if (!port->dpcd) {
570 kfree(objp: port->edid);
571 return -ENOMEM;
572 }
573
574 memcpy(port->edid->edid_block, virtual_dp_monitor_edid[resolution],
575 EDID_SIZE);
576 port->edid->data_valid = true;
577
578 memcpy(port->dpcd->data, dpcd_fix_data, DPCD_HEADER_SIZE);
579 port->dpcd->data_valid = true;
580 port->dpcd->data[DP_SINK_COUNT] = 0x1;
581 port->type = type;
582 port->id = resolution;
583 port->vrefresh_k = GVT_DEFAULT_REFRESH_RATE * MSEC_PER_SEC;
584 vgpu->display.port_num = port_num;
585
586 /* Init hrtimer based on default refresh rate */
587 hrtimer_setup(timer: &vblank_timer->timer, function: vblank_timer_fn, CLOCK_MONOTONIC, mode: HRTIMER_MODE_ABS);
588 vblank_timer->vrefresh_k = port->vrefresh_k;
589 vblank_timer->period = DIV64_U64_ROUND_CLOSEST(NSEC_PER_SEC * MSEC_PER_SEC, vblank_timer->vrefresh_k);
590
591 emulate_monitor_status_change(vgpu);
592
593 return 0;
594}
595
596/**
597 * vgpu_update_vblank_emulation - Update per-vGPU vblank_timer
598 * @vgpu: vGPU operated
599 * @turnon: Turn ON/OFF vblank_timer
600 *
601 * This function is used to turn on/off or update the per-vGPU vblank_timer
602 * when TRANSCONF is enabled or disabled. vblank_timer period is also updated
603 * if guest changed the refresh rate.
604 *
605 */
606void vgpu_update_vblank_emulation(struct intel_vgpu *vgpu, bool turnon)
607{
608 struct intel_vgpu_vblank_timer *vblank_timer = &vgpu->vblank_timer;
609 struct intel_vgpu_port *port =
610 intel_vgpu_port(vgpu, vgpu->display.port_num);
611
612 if (turnon) {
613 /*
614 * Skip the re-enable if already active and vrefresh unchanged.
615 * Otherwise, stop timer if already active and restart with new
616 * period.
617 */
618 if (vblank_timer->vrefresh_k != port->vrefresh_k ||
619 !hrtimer_active(timer: &vblank_timer->timer)) {
620 /* Stop timer before start with new period if active */
621 if (hrtimer_active(timer: &vblank_timer->timer))
622 hrtimer_cancel(timer: &vblank_timer->timer);
623
624 /* Make sure new refresh rate updated to timer period */
625 vblank_timer->vrefresh_k = port->vrefresh_k;
626 vblank_timer->period = DIV64_U64_ROUND_CLOSEST(NSEC_PER_SEC * MSEC_PER_SEC, vblank_timer->vrefresh_k);
627 hrtimer_start(timer: &vblank_timer->timer,
628 ktime_add_ns(ktime_get(), vblank_timer->period),
629 mode: HRTIMER_MODE_ABS);
630 }
631 } else {
632 /* Caller request to stop vblank */
633 hrtimer_cancel(timer: &vblank_timer->timer);
634 }
635}
636
637static void emulate_vblank_on_pipe(struct intel_vgpu *vgpu, int pipe)
638{
639 struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
640 struct intel_display *display = dev_priv->display;
641 struct intel_vgpu_irq *irq = &vgpu->irq;
642 int vblank_event[] = {
643 [PIPE_A] = PIPE_A_VBLANK,
644 [PIPE_B] = PIPE_B_VBLANK,
645 [PIPE_C] = PIPE_C_VBLANK,
646 };
647 int event;
648
649 if (pipe < PIPE_A || pipe > PIPE_C)
650 return;
651
652 for_each_set_bit(event, irq->flip_done_event[pipe],
653 INTEL_GVT_EVENT_MAX) {
654 clear_bit(nr: event, addr: irq->flip_done_event[pipe]);
655 if (!pipe_is_enabled(vgpu, pipe))
656 continue;
657
658 intel_vgpu_trigger_virtual_event(vgpu, event);
659 }
660
661 if (pipe_is_enabled(vgpu, pipe)) {
662 vgpu_vreg_t(vgpu, PIPE_FRMCOUNT_G4X(display, pipe))++;
663 intel_vgpu_trigger_virtual_event(vgpu, event: vblank_event[pipe]);
664 }
665}
666
667void intel_vgpu_emulate_vblank(struct intel_vgpu *vgpu)
668{
669 struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
670 struct intel_display *display = i915->display;
671 int pipe;
672
673 mutex_lock(&vgpu->vgpu_lock);
674 for_each_pipe(display, pipe)
675 emulate_vblank_on_pipe(vgpu, pipe);
676 mutex_unlock(lock: &vgpu->vgpu_lock);
677}
678
679/**
680 * intel_vgpu_emulate_hotplug - trigger hotplug event for vGPU
681 * @vgpu: a vGPU
682 * @connected: link state
683 *
684 * This function is used to trigger hotplug interrupt for vGPU
685 *
686 */
687void intel_vgpu_emulate_hotplug(struct intel_vgpu *vgpu, bool connected)
688{
689 struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
690
691 /* TODO: add more platforms support */
692 if (IS_SKYLAKE(i915) ||
693 IS_KABYLAKE(i915) ||
694 IS_COFFEELAKE(i915) ||
695 IS_COMETLAKE(i915)) {
696 if (connected) {
697 vgpu_vreg_t(vgpu, SFUSE_STRAP) |=
698 SFUSE_STRAP_DDID_DETECTED;
699 vgpu_vreg_t(vgpu, SDEISR) |= SDE_PORTD_HOTPLUG_CPT;
700 } else {
701 vgpu_vreg_t(vgpu, SFUSE_STRAP) &=
702 ~SFUSE_STRAP_DDID_DETECTED;
703 vgpu_vreg_t(vgpu, SDEISR) &= ~SDE_PORTD_HOTPLUG_CPT;
704 }
705 vgpu_vreg_t(vgpu, SDEIIR) |= SDE_PORTD_HOTPLUG_CPT;
706 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
707 PORTD_HOTPLUG_STATUS_MASK;
708 intel_vgpu_trigger_virtual_event(vgpu, event: DP_D_HOTPLUG);
709 } else if (IS_BROXTON(i915)) {
710 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_A)) {
711 if (connected) {
712 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) |=
713 GEN8_DE_PORT_HOTPLUG(HPD_PORT_A);
714 } else {
715 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) &=
716 ~GEN8_DE_PORT_HOTPLUG(HPD_PORT_A);
717 }
718 vgpu_vreg_t(vgpu, GEN8_DE_PORT_IIR) |=
719 GEN8_DE_PORT_HOTPLUG(HPD_PORT_A);
720 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) &=
721 ~PORTA_HOTPLUG_STATUS_MASK;
722 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
723 PORTA_HOTPLUG_LONG_DETECT;
724 intel_vgpu_trigger_virtual_event(vgpu, event: DP_A_HOTPLUG);
725 }
726 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_B)) {
727 if (connected) {
728 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) |=
729 GEN8_DE_PORT_HOTPLUG(HPD_PORT_B);
730 vgpu_vreg_t(vgpu, SFUSE_STRAP) |=
731 SFUSE_STRAP_DDIB_DETECTED;
732 } else {
733 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) &=
734 ~GEN8_DE_PORT_HOTPLUG(HPD_PORT_B);
735 vgpu_vreg_t(vgpu, SFUSE_STRAP) &=
736 ~SFUSE_STRAP_DDIB_DETECTED;
737 }
738 vgpu_vreg_t(vgpu, GEN8_DE_PORT_IIR) |=
739 GEN8_DE_PORT_HOTPLUG(HPD_PORT_B);
740 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) &=
741 ~PORTB_HOTPLUG_STATUS_MASK;
742 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
743 PORTB_HOTPLUG_LONG_DETECT;
744 intel_vgpu_trigger_virtual_event(vgpu, event: DP_B_HOTPLUG);
745 }
746 if (intel_vgpu_has_monitor_on_port(vgpu, PORT_C)) {
747 if (connected) {
748 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) |=
749 GEN8_DE_PORT_HOTPLUG(HPD_PORT_C);
750 vgpu_vreg_t(vgpu, SFUSE_STRAP) |=
751 SFUSE_STRAP_DDIC_DETECTED;
752 } else {
753 vgpu_vreg_t(vgpu, GEN8_DE_PORT_ISR) &=
754 ~GEN8_DE_PORT_HOTPLUG(HPD_PORT_C);
755 vgpu_vreg_t(vgpu, SFUSE_STRAP) &=
756 ~SFUSE_STRAP_DDIC_DETECTED;
757 }
758 vgpu_vreg_t(vgpu, GEN8_DE_PORT_IIR) |=
759 GEN8_DE_PORT_HOTPLUG(HPD_PORT_C);
760 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) &=
761 ~PORTC_HOTPLUG_STATUS_MASK;
762 vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
763 PORTC_HOTPLUG_LONG_DETECT;
764 intel_vgpu_trigger_virtual_event(vgpu, event: DP_C_HOTPLUG);
765 }
766 }
767}
768
769/**
770 * intel_vgpu_clean_display - clean vGPU virtual display emulation
771 * @vgpu: a vGPU
772 *
773 * This function is used to clean vGPU virtual display emulation stuffs
774 *
775 */
776void intel_vgpu_clean_display(struct intel_vgpu *vgpu)
777{
778 struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
779
780 if (IS_SKYLAKE(dev_priv) ||
781 IS_KABYLAKE(dev_priv) ||
782 IS_COFFEELAKE(dev_priv) ||
783 IS_COMETLAKE(dev_priv))
784 clean_virtual_dp_monitor(vgpu, port_num: PORT_D);
785 else
786 clean_virtual_dp_monitor(vgpu, port_num: PORT_B);
787
788 vgpu_update_vblank_emulation(vgpu, turnon: false);
789}
790
791/**
792 * intel_vgpu_init_display- initialize vGPU virtual display emulation
793 * @vgpu: a vGPU
794 * @resolution: resolution index for intel_vgpu_edid
795 *
796 * This function is used to initialize vGPU virtual display emulation stuffs
797 *
798 * Returns:
799 * Zero on success, negative error code if failed.
800 *
801 */
802int intel_vgpu_init_display(struct intel_vgpu *vgpu, u64 resolution)
803{
804 struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
805
806 intel_vgpu_init_i2c_edid(vgpu);
807
808 if (IS_SKYLAKE(dev_priv) ||
809 IS_KABYLAKE(dev_priv) ||
810 IS_COFFEELAKE(dev_priv) ||
811 IS_COMETLAKE(dev_priv))
812 return setup_virtual_dp_monitor(vgpu, port_num: PORT_D, type: GVT_DP_D,
813 resolution);
814 else
815 return setup_virtual_dp_monitor(vgpu, port_num: PORT_B, type: GVT_DP_B,
816 resolution);
817}
818
819/**
820 * intel_vgpu_reset_display- reset vGPU virtual display emulation
821 * @vgpu: a vGPU
822 *
823 * This function is used to reset vGPU virtual display emulation stuffs
824 *
825 */
826void intel_vgpu_reset_display(struct intel_vgpu *vgpu)
827{
828 emulate_monitor_status_change(vgpu);
829}
830

source code of linux/drivers/gpu/drm/i915/gvt/display.c