1/*
2 * Copyright 2019 Advanced Micro Devices, Inc.
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 shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26#include "dmub_psr.h"
27#include "dc.h"
28#include "dc_dmub_srv.h"
29#include "dmub/dmub_srv.h"
30#include "core_types.h"
31
32#define DC_TRACE_LEVEL_MESSAGE(...) do {} while (0) /* do nothing */
33
34#define MAX_PIPES 6
35
36static const uint8_t DP_SINK_DEVICE_STR_ID_1[] = {7, 1, 8, 7, 3};
37static const uint8_t DP_SINK_DEVICE_STR_ID_2[] = {7, 1, 8, 7, 5};
38static const uint8_t DP_SINK_DEVICE_STR_ID_3[] = {0x42, 0x61, 0x6c, 0x73, 0x61};
39
40/*
41 * Convert dmcub psr state to dmcu psr state.
42 */
43static enum dc_psr_state convert_psr_state(uint32_t raw_state)
44{
45 enum dc_psr_state state = PSR_STATE0;
46
47 if (raw_state == 0)
48 state = PSR_STATE0;
49 else if (raw_state == 0x10)
50 state = PSR_STATE1;
51 else if (raw_state == 0x11)
52 state = PSR_STATE1a;
53 else if (raw_state == 0x20)
54 state = PSR_STATE2;
55 else if (raw_state == 0x21)
56 state = PSR_STATE2a;
57 else if (raw_state == 0x22)
58 state = PSR_STATE2b;
59 else if (raw_state == 0x30)
60 state = PSR_STATE3;
61 else if (raw_state == 0x31)
62 state = PSR_STATE3Init;
63 else if (raw_state == 0x40)
64 state = PSR_STATE4;
65 else if (raw_state == 0x41)
66 state = PSR_STATE4a;
67 else if (raw_state == 0x42)
68 state = PSR_STATE4b;
69 else if (raw_state == 0x43)
70 state = PSR_STATE4c;
71 else if (raw_state == 0x44)
72 state = PSR_STATE4d;
73 else if (raw_state == 0x50)
74 state = PSR_STATE5;
75 else if (raw_state == 0x51)
76 state = PSR_STATE5a;
77 else if (raw_state == 0x52)
78 state = PSR_STATE5b;
79 else if (raw_state == 0x53)
80 state = PSR_STATE5c;
81 else if (raw_state == 0x4A)
82 state = PSR_STATE4_FULL_FRAME;
83 else if (raw_state == 0x4B)
84 state = PSR_STATE4a_FULL_FRAME;
85 else if (raw_state == 0x4C)
86 state = PSR_STATE4b_FULL_FRAME;
87 else if (raw_state == 0x4D)
88 state = PSR_STATE4c_FULL_FRAME;
89 else if (raw_state == 0x4E)
90 state = PSR_STATE4_FULL_FRAME_POWERUP;
91 else if (raw_state == 0x4F)
92 state = PSR_STATE4_FULL_FRAME_HW_LOCK;
93 else if (raw_state == 0x60)
94 state = PSR_STATE_HWLOCK_MGR;
95 else if (raw_state == 0x61)
96 state = PSR_STATE_POLLVUPDATE;
97 else if (raw_state == 0x62)
98 state = PSR_STATE_RELEASE_HWLOCK_MGR_FULL_FRAME;
99 else
100 state = PSR_STATE_INVALID;
101
102 return state;
103}
104
105/*
106 * Get PSR state from firmware.
107 */
108static void dmub_psr_get_state(struct dmub_psr *dmub, enum dc_psr_state *state, uint8_t panel_inst)
109{
110 uint32_t raw_state = 0;
111 uint32_t retry_count = 0;
112
113 do {
114 // Send gpint command and wait for ack
115 if (dc_wake_and_execute_gpint(ctx: dmub->ctx, command_code: DMUB_GPINT__GET_PSR_STATE, param: panel_inst, response: &raw_state,
116 wait_type: DM_DMUB_WAIT_TYPE_WAIT_WITH_REPLY)) {
117 *state = convert_psr_state(raw_state);
118 } else {
119 // Return invalid state when GPINT times out
120 *state = PSR_STATE_INVALID;
121 }
122 } while (++retry_count <= 1000 && *state == PSR_STATE_INVALID);
123
124 // Assert if max retry hit
125 if (retry_count >= 1000 && *state == PSR_STATE_INVALID) {
126 ASSERT(0);
127 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
128 WPP_BIT_FLAG_Firmware_PsrState,
129 "Unable to get PSR state from FW.");
130 } else
131 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_VERBOSE,
132 WPP_BIT_FLAG_Firmware_PsrState,
133 "Got PSR state from FW. PSR state: %d, Retry count: %d",
134 *state, retry_count);
135}
136
137/*
138 * Set PSR version.
139 */
140static bool dmub_psr_set_version(struct dmub_psr *dmub, struct dc_stream_state *stream, uint8_t panel_inst)
141{
142 union dmub_rb_cmd cmd;
143 struct dc_context *dc = dmub->ctx;
144
145 if (stream->link->psr_settings.psr_version == DC_PSR_VERSION_UNSUPPORTED)
146 return false;
147
148 memset(&cmd, 0, sizeof(cmd));
149 cmd.psr_set_version.header.type = DMUB_CMD__PSR;
150 cmd.psr_set_version.header.sub_type = DMUB_CMD__PSR_SET_VERSION;
151 switch (stream->link->psr_settings.psr_version) {
152 case DC_PSR_VERSION_1:
153 cmd.psr_set_version.psr_set_version_data.version = PSR_VERSION_1;
154 break;
155 case DC_PSR_VERSION_SU_1:
156 cmd.psr_set_version.psr_set_version_data.version = PSR_VERSION_SU_1;
157 break;
158 case DC_PSR_VERSION_UNSUPPORTED:
159 default:
160 cmd.psr_set_version.psr_set_version_data.version = PSR_VERSION_UNSUPPORTED;
161 break;
162 }
163
164 if (cmd.psr_set_version.psr_set_version_data.version == PSR_VERSION_UNSUPPORTED)
165 return false;
166
167 cmd.psr_set_version.psr_set_version_data.cmd_version = DMUB_CMD_PSR_CONTROL_VERSION_1;
168 cmd.psr_set_version.psr_set_version_data.panel_inst = panel_inst;
169 cmd.psr_set_version.header.payload_bytes = sizeof(struct dmub_cmd_psr_set_version_data);
170
171 dc_wake_and_execute_dmub_cmd(ctx: dc, cmd: &cmd, wait_type: DM_DMUB_WAIT_TYPE_WAIT);
172
173 return true;
174}
175
176/*
177 * Enable/Disable PSR.
178 */
179static void dmub_psr_enable(struct dmub_psr *dmub, bool enable, bool wait, uint8_t panel_inst)
180{
181 union dmub_rb_cmd cmd;
182 struct dc_context *dc = dmub->ctx;
183 uint32_t retry_count;
184 enum dc_psr_state state = PSR_STATE0;
185
186 memset(&cmd, 0, sizeof(cmd));
187 cmd.psr_enable.header.type = DMUB_CMD__PSR;
188
189 cmd.psr_enable.data.cmd_version = DMUB_CMD_PSR_CONTROL_VERSION_1;
190 cmd.psr_enable.data.panel_inst = panel_inst;
191
192 if (enable)
193 cmd.psr_enable.header.sub_type = DMUB_CMD__PSR_ENABLE;
194 else
195 cmd.psr_enable.header.sub_type = DMUB_CMD__PSR_DISABLE;
196
197 cmd.psr_enable.header.payload_bytes = 0; // Send header only
198
199 dc_wake_and_execute_dmub_cmd(ctx: dc->dmub_srv->ctx, cmd: &cmd, wait_type: DM_DMUB_WAIT_TYPE_WAIT);
200
201 /* Below loops 1000 x 500us = 500 ms.
202 * Exit PSR may need to wait 1-2 frames to power up. Timeout after at
203 * least a few frames. Should never hit the max retry assert below.
204 */
205 if (wait) {
206 for (retry_count = 0; retry_count <= 1000; retry_count++) {
207 dmub_psr_get_state(dmub, state: &state, panel_inst);
208
209 if (enable) {
210 if (state != PSR_STATE0)
211 break;
212 } else {
213 if (state == PSR_STATE0)
214 break;
215 }
216
217 /* must *not* be fsleep - this can be called from high irq levels */
218 udelay(usec: 500);
219 }
220
221 /* assert if max retry hit */
222 if (retry_count >= 1000)
223 ASSERT(0);
224 }
225}
226
227/*
228 * Set PSR level.
229 */
230static void dmub_psr_set_level(struct dmub_psr *dmub, uint16_t psr_level, uint8_t panel_inst)
231{
232 union dmub_rb_cmd cmd;
233 enum dc_psr_state state = PSR_STATE0;
234 struct dc_context *dc = dmub->ctx;
235
236 dmub_psr_get_state(dmub, state: &state, panel_inst);
237
238 if (state == PSR_STATE0)
239 return;
240
241 memset(&cmd, 0, sizeof(cmd));
242 cmd.psr_set_level.header.type = DMUB_CMD__PSR;
243 cmd.psr_set_level.header.sub_type = DMUB_CMD__PSR_SET_LEVEL;
244 cmd.psr_set_level.header.payload_bytes = sizeof(struct dmub_cmd_psr_set_level_data);
245 cmd.psr_set_level.psr_set_level_data.psr_level = psr_level;
246 cmd.psr_set_level.psr_set_level_data.cmd_version = DMUB_CMD_PSR_CONTROL_VERSION_1;
247 cmd.psr_set_level.psr_set_level_data.panel_inst = panel_inst;
248 dc_wake_and_execute_dmub_cmd(ctx: dc, cmd: &cmd, wait_type: DM_DMUB_WAIT_TYPE_WAIT);
249}
250
251/*
252 * Set PSR vtotal requirement for FreeSync PSR.
253 */
254static void dmub_psr_set_sink_vtotal_in_psr_active(struct dmub_psr *dmub,
255 uint16_t psr_vtotal_idle, uint16_t psr_vtotal_su)
256{
257 union dmub_rb_cmd cmd;
258 struct dc_context *dc = dmub->ctx;
259
260 memset(&cmd, 0, sizeof(cmd));
261 cmd.psr_set_vtotal.header.type = DMUB_CMD__PSR;
262 cmd.psr_set_vtotal.header.sub_type = DMUB_CMD__SET_SINK_VTOTAL_IN_PSR_ACTIVE;
263 cmd.psr_set_vtotal.header.payload_bytes = sizeof(struct dmub_cmd_psr_set_vtotal_data);
264 cmd.psr_set_vtotal.psr_set_vtotal_data.psr_vtotal_idle = psr_vtotal_idle;
265 cmd.psr_set_vtotal.psr_set_vtotal_data.psr_vtotal_su = psr_vtotal_su;
266
267 dc_wake_and_execute_dmub_cmd(ctx: dc, cmd: &cmd, wait_type: DM_DMUB_WAIT_TYPE_WAIT);
268}
269
270/*
271 * Set PSR power optimization flags.
272 */
273static void dmub_psr_set_power_opt(struct dmub_psr *dmub, unsigned int power_opt, uint8_t panel_inst)
274{
275 union dmub_rb_cmd cmd;
276 struct dc_context *dc = dmub->ctx;
277
278 memset(&cmd, 0, sizeof(cmd));
279 cmd.psr_set_power_opt.header.type = DMUB_CMD__PSR;
280 cmd.psr_set_power_opt.header.sub_type = DMUB_CMD__SET_PSR_POWER_OPT;
281 cmd.psr_set_power_opt.header.payload_bytes = sizeof(struct dmub_cmd_psr_set_power_opt_data);
282 cmd.psr_set_power_opt.psr_set_power_opt_data.cmd_version = DMUB_CMD_PSR_CONTROL_VERSION_1;
283 cmd.psr_set_power_opt.psr_set_power_opt_data.power_opt = power_opt;
284 cmd.psr_set_power_opt.psr_set_power_opt_data.panel_inst = panel_inst;
285
286 dc_wake_and_execute_dmub_cmd(ctx: dc, cmd: &cmd, wait_type: DM_DMUB_WAIT_TYPE_WAIT);
287}
288
289/*
290 * Setup PSR by programming phy registers and sending psr hw context values to firmware.
291 */
292static bool dmub_psr_copy_settings(struct dmub_psr *dmub,
293 struct dc_link *link,
294 struct psr_context *psr_context,
295 uint8_t panel_inst)
296{
297 union dmub_rb_cmd cmd = { 0 };
298 struct dc_context *dc = dmub->ctx;
299 struct dmub_cmd_psr_copy_settings_data *copy_settings_data
300 = &cmd.psr_copy_settings.psr_copy_settings_data;
301 struct pipe_ctx *pipe_ctx = NULL;
302 struct resource_context *res_ctx = &link->ctx->dc->current_state->res_ctx;
303 int i = 0;
304
305 for (i = 0; i < MAX_PIPES; i++) {
306 if (res_ctx->pipe_ctx[i].stream &&
307 res_ctx->pipe_ctx[i].stream->link == link &&
308 res_ctx->pipe_ctx[i].stream->link->connector_signal == SIGNAL_TYPE_EDP) {
309 pipe_ctx = &res_ctx->pipe_ctx[i];
310 //TODO: refactor for multi edp support
311 break;
312 }
313 }
314
315 if (!pipe_ctx)
316 return false;
317
318 // First, set the psr version
319 if (!dmub_psr_set_version(dmub, stream: pipe_ctx->stream, panel_inst))
320 return false;
321
322 // Program DP DPHY fast training registers
323 link->link_enc->funcs->psr_program_dp_dphy_fast_training(link->link_enc,
324 psr_context->psrExitLinkTrainingRequired);
325
326 // Program DP_SEC_CNTL1 register to set transmission GPS0 line num and priority to high
327 link->link_enc->funcs->psr_program_secondary_packet(link->link_enc,
328 psr_context->sdpTransmitLineNumDeadline);
329
330 memset(&cmd, 0, sizeof(cmd));
331 cmd.psr_copy_settings.header.type = DMUB_CMD__PSR;
332 cmd.psr_copy_settings.header.sub_type = DMUB_CMD__PSR_COPY_SETTINGS;
333 cmd.psr_copy_settings.header.payload_bytes = sizeof(struct dmub_cmd_psr_copy_settings_data);
334
335 // Hw insts
336 copy_settings_data->dpphy_inst = psr_context->transmitterId;
337 copy_settings_data->aux_inst = psr_context->channel;
338 copy_settings_data->digfe_inst = psr_context->engineId;
339 copy_settings_data->digbe_inst = psr_context->transmitterId;
340
341 copy_settings_data->mpcc_inst = pipe_ctx->plane_res.mpcc_inst;
342
343 if (pipe_ctx->plane_res.dpp)
344 copy_settings_data->dpp_inst = pipe_ctx->plane_res.dpp->inst;
345 else
346 copy_settings_data->dpp_inst = 0;
347 if (pipe_ctx->stream_res.opp)
348 copy_settings_data->opp_inst = pipe_ctx->stream_res.opp->inst;
349 else
350 copy_settings_data->opp_inst = 0;
351 if (pipe_ctx->stream_res.tg)
352 copy_settings_data->otg_inst = pipe_ctx->stream_res.tg->inst;
353 else
354 copy_settings_data->otg_inst = 0;
355
356 // Misc
357 copy_settings_data->use_phy_fsm = link->ctx->dc->debug.psr_power_use_phy_fsm;
358 copy_settings_data->psr_level = psr_context->psr_level.u32all;
359 copy_settings_data->smu_optimizations_en = psr_context->allow_smu_optimizations;
360 copy_settings_data->multi_disp_optimizations_en = psr_context->allow_multi_disp_optimizations;
361 copy_settings_data->frame_delay = psr_context->frame_delay;
362 copy_settings_data->frame_cap_ind = psr_context->psrFrameCaptureIndicationReq;
363 copy_settings_data->init_sdp_deadline = psr_context->sdpTransmitLineNumDeadline;
364 copy_settings_data->debug.u32All = 0;
365 copy_settings_data->debug.bitfields.visual_confirm = dc->dc->debug.visual_confirm == VISUAL_CONFIRM_PSR;
366 copy_settings_data->debug.bitfields.use_hw_lock_mgr = 1;
367 copy_settings_data->debug.bitfields.force_full_frame_update = 0;
368 copy_settings_data->debug.bitfields.enable_ips_visual_confirm = dc->dc->debug.enable_ips_visual_confirm;
369
370 if (psr_context->su_granularity_required == 0)
371 copy_settings_data->su_y_granularity = 0;
372 else
373 copy_settings_data->su_y_granularity = psr_context->su_y_granularity;
374
375 copy_settings_data->line_capture_indication = 0;
376 copy_settings_data->line_time_in_us = psr_context->line_time_in_us;
377 copy_settings_data->rate_control_caps = psr_context->rate_control_caps;
378 copy_settings_data->fec_enable_status = (link->fec_state == dc_link_fec_enabled);
379 copy_settings_data->fec_enable_delay_in100us = link->dc->debug.fec_enable_delay_in100us;
380 copy_settings_data->cmd_version = DMUB_CMD_PSR_CONTROL_VERSION_1;
381 copy_settings_data->panel_inst = panel_inst;
382 copy_settings_data->dsc_enable_status = (pipe_ctx->stream->timing.flags.DSC == 1);
383
384 /**
385 * WA for PSRSU+DSC on specific TCON, if DSC is enabled, force PSRSU as ffu mode(full frame update)
386 * Note that PSRSU+DSC is still under development.
387 */
388 if (copy_settings_data->dsc_enable_status &&
389 link->dpcd_caps.sink_dev_id == DP_DEVICE_ID_38EC11 &&
390 !memcmp(p: link->dpcd_caps.sink_dev_id_str, q: DP_SINK_DEVICE_STR_ID_1,
391 size: sizeof(DP_SINK_DEVICE_STR_ID_1)))
392 link->psr_settings.force_ffu_mode = 1;
393
394 copy_settings_data->force_ffu_mode = link->psr_settings.force_ffu_mode || psr_context->os_request_force_ffu;
395
396 if (((link->dpcd_caps.fec_cap.bits.FEC_CAPABLE &&
397 !link->dc->debug.disable_fec) &&
398 (link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT &&
399 !link->panel_config.dsc.disable_dsc_edp &&
400 link->dc->caps.edp_dsc_support)) &&
401 link->dpcd_caps.sink_dev_id == DP_DEVICE_ID_38EC11 &&
402 (!memcmp(p: link->dpcd_caps.sink_dev_id_str, q: DP_SINK_DEVICE_STR_ID_1,
403 size: sizeof(DP_SINK_DEVICE_STR_ID_1)) ||
404 !memcmp(p: link->dpcd_caps.sink_dev_id_str, q: DP_SINK_DEVICE_STR_ID_2,
405 size: sizeof(DP_SINK_DEVICE_STR_ID_2))))
406 copy_settings_data->debug.bitfields.force_wakeup_by_tps3 = 1;
407 else
408 copy_settings_data->debug.bitfields.force_wakeup_by_tps3 = 0;
409
410 if (link->psr_settings.psr_version == DC_PSR_VERSION_1 &&
411 link->dpcd_caps.sink_dev_id == DP_DEVICE_ID_0022B9 &&
412 !memcmp(p: link->dpcd_caps.sink_dev_id_str, q: DP_SINK_DEVICE_STR_ID_3,
413 size: sizeof(DP_SINK_DEVICE_STR_ID_3))) {
414 copy_settings_data->poweroff_before_vertical_line = 16;
415 }
416
417 //WA for PSR1 on specific TCON, require frame delay for frame re-lock
418 copy_settings_data->relock_delay_frame_cnt = 0;
419 if (link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_001CF8)
420 copy_settings_data->relock_delay_frame_cnt = 2;
421
422 copy_settings_data->power_down_phy_before_disable_stream =
423 link->psr_settings.power_down_phy_before_disable_stream;
424
425 copy_settings_data->dsc_slice_height = psr_context->dsc_slice_height;
426
427 dc_wake_and_execute_dmub_cmd(ctx: dc, cmd: &cmd, wait_type: DM_DMUB_WAIT_TYPE_WAIT);
428
429 return true;
430}
431
432/*
433 * Send command to PSR to force static ENTER and ignore all state changes until exit
434 */
435static void dmub_psr_force_static(struct dmub_psr *dmub, uint8_t panel_inst)
436{
437 union dmub_rb_cmd cmd;
438 struct dc_context *dc = dmub->ctx;
439
440 memset(&cmd, 0, sizeof(cmd));
441
442 cmd.psr_force_static.psr_force_static_data.panel_inst = panel_inst;
443 cmd.psr_force_static.psr_force_static_data.cmd_version = DMUB_CMD_PSR_CONTROL_VERSION_1;
444 cmd.psr_force_static.header.type = DMUB_CMD__PSR;
445 cmd.psr_force_static.header.sub_type = DMUB_CMD__PSR_FORCE_STATIC;
446 cmd.psr_enable.header.payload_bytes = 0;
447
448 dc_wake_and_execute_dmub_cmd(ctx: dc, cmd: &cmd, wait_type: DM_DMUB_WAIT_TYPE_WAIT);
449}
450
451/*
452 * Get PSR residency from firmware.
453 */
454static void dmub_psr_get_residency(struct dmub_psr *dmub, uint32_t *residency,
455 uint8_t panel_inst, enum psr_residency_mode mode)
456{
457 uint16_t param = (uint16_t)(panel_inst << 8);
458
459 param |= mode;
460
461 /* Send gpint command and wait for ack */
462 dc_wake_and_execute_gpint(ctx: dmub->ctx, command_code: DMUB_GPINT__PSR_RESIDENCY, param, response: residency,
463 wait_type: DM_DMUB_WAIT_TYPE_WAIT_WITH_REPLY);
464}
465
466static const struct dmub_psr_funcs psr_funcs = {
467 .psr_copy_settings = dmub_psr_copy_settings,
468 .psr_enable = dmub_psr_enable,
469 .psr_get_state = dmub_psr_get_state,
470 .psr_set_level = dmub_psr_set_level,
471 .psr_force_static = dmub_psr_force_static,
472 .psr_get_residency = dmub_psr_get_residency,
473 .psr_set_sink_vtotal_in_psr_active = dmub_psr_set_sink_vtotal_in_psr_active,
474 .psr_set_power_opt = dmub_psr_set_power_opt,
475};
476
477/*
478 * Construct PSR object.
479 */
480static void dmub_psr_construct(struct dmub_psr *psr, struct dc_context *ctx)
481{
482 psr->ctx = ctx;
483 psr->funcs = &psr_funcs;
484}
485
486/*
487 * Allocate and initialize PSR object.
488 */
489struct dmub_psr *dmub_psr_create(struct dc_context *ctx)
490{
491 struct dmub_psr *psr = kzalloc(sizeof(struct dmub_psr), GFP_KERNEL);
492
493 if (psr == NULL) {
494 BREAK_TO_DEBUGGER();
495 return NULL;
496 }
497
498 dmub_psr_construct(psr, ctx);
499
500 return psr;
501}
502
503/*
504 * Deallocate PSR object.
505 */
506void dmub_psr_destroy(struct dmub_psr **dmub)
507{
508 kfree(objp: *dmub);
509 *dmub = NULL;
510}
511

source code of linux/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c