1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
4 */
5
6 #define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
7
8 #include <linux/clk.h>
9 #include <linux/clk-provider.h>
10 #include <linux/regulator/consumer.h>
11 #include <linux/pm_opp.h>
12 #include "dp_power.h"
13 #include "msm_drv.h"
14
15 struct dp_power_private {
16 struct dp_parser *parser;
17 struct platform_device *pdev;
18 struct device *dev;
19 struct clk *link_clk_src;
20 struct clk *pixel_provider;
21 struct clk *link_provider;
22 struct regulator_bulk_data supplies[DP_DEV_REGULATOR_MAX];
23
24 struct dp_power dp_power;
25 };
26
dp_power_regulator_disable(struct dp_power_private * power)27 static void dp_power_regulator_disable(struct dp_power_private *power)
28 {
29 struct regulator_bulk_data *s = power->supplies;
30 const struct dp_reg_entry *regs = power->parser->regulator_cfg->regs;
31 int num = power->parser->regulator_cfg->num;
32 int i;
33
34 DBG("");
35 for (i = num - 1; i >= 0; i--)
36 if (regs[i].disable_load >= 0)
37 regulator_set_load(s[i].consumer,
38 regs[i].disable_load);
39
40 regulator_bulk_disable(num, s);
41 }
42
dp_power_regulator_enable(struct dp_power_private * power)43 static int dp_power_regulator_enable(struct dp_power_private *power)
44 {
45 struct regulator_bulk_data *s = power->supplies;
46 const struct dp_reg_entry *regs = power->parser->regulator_cfg->regs;
47 int num = power->parser->regulator_cfg->num;
48 int ret, i;
49
50 DBG("");
51 for (i = 0; i < num; i++) {
52 if (regs[i].enable_load >= 0) {
53 ret = regulator_set_load(s[i].consumer,
54 regs[i].enable_load);
55 if (ret < 0) {
56 pr_err("regulator %d set op mode failed, %d\n",
57 i, ret);
58 goto fail;
59 }
60 }
61 }
62
63 ret = regulator_bulk_enable(num, s);
64 if (ret < 0) {
65 pr_err("regulator enable failed, %d\n", ret);
66 goto fail;
67 }
68
69 return 0;
70
71 fail:
72 for (i--; i >= 0; i--)
73 regulator_set_load(s[i].consumer, regs[i].disable_load);
74 return ret;
75 }
76
dp_power_regulator_init(struct dp_power_private * power)77 static int dp_power_regulator_init(struct dp_power_private *power)
78 {
79 struct regulator_bulk_data *s = power->supplies;
80 const struct dp_reg_entry *regs = power->parser->regulator_cfg->regs;
81 struct platform_device *pdev = power->pdev;
82 int num = power->parser->regulator_cfg->num;
83 int i, ret;
84
85 for (i = 0; i < num; i++)
86 s[i].supply = regs[i].name;
87
88 ret = devm_regulator_bulk_get(&pdev->dev, num, s);
89 if (ret < 0) {
90 pr_err("%s: failed to init regulator, ret=%d\n",
91 __func__, ret);
92 return ret;
93 }
94
95 return 0;
96 }
97
dp_power_clk_init(struct dp_power_private * power)98 static int dp_power_clk_init(struct dp_power_private *power)
99 {
100 int rc = 0;
101 struct dss_module_power *core, *ctrl, *stream;
102 struct device *dev = &power->pdev->dev;
103
104 core = &power->parser->mp[DP_CORE_PM];
105 ctrl = &power->parser->mp[DP_CTRL_PM];
106 stream = &power->parser->mp[DP_STREAM_PM];
107
108 rc = msm_dss_get_clk(dev, core->clk_config, core->num_clk);
109 if (rc) {
110 DRM_ERROR("failed to get %s clk. err=%d\n",
111 dp_parser_pm_name(DP_CORE_PM), rc);
112 return rc;
113 }
114
115 rc = msm_dss_get_clk(dev, ctrl->clk_config, ctrl->num_clk);
116 if (rc) {
117 DRM_ERROR("failed to get %s clk. err=%d\n",
118 dp_parser_pm_name(DP_CTRL_PM), rc);
119 msm_dss_put_clk(core->clk_config, core->num_clk);
120 return -ENODEV;
121 }
122
123 rc = msm_dss_get_clk(dev, stream->clk_config, stream->num_clk);
124 if (rc) {
125 DRM_ERROR("failed to get %s clk. err=%d\n",
126 dp_parser_pm_name(DP_CTRL_PM), rc);
127 msm_dss_put_clk(core->clk_config, core->num_clk);
128 return -ENODEV;
129 }
130
131 return 0;
132 }
133
dp_power_clk_deinit(struct dp_power_private * power)134 static int dp_power_clk_deinit(struct dp_power_private *power)
135 {
136 struct dss_module_power *core, *ctrl, *stream;
137
138 core = &power->parser->mp[DP_CORE_PM];
139 ctrl = &power->parser->mp[DP_CTRL_PM];
140 stream = &power->parser->mp[DP_STREAM_PM];
141
142 if (!core || !ctrl || !stream) {
143 DRM_ERROR("invalid power_data\n");
144 return -EINVAL;
145 }
146
147 msm_dss_put_clk(ctrl->clk_config, ctrl->num_clk);
148 msm_dss_put_clk(core->clk_config, core->num_clk);
149 msm_dss_put_clk(stream->clk_config, stream->num_clk);
150 return 0;
151 }
152
dp_power_clk_set_link_rate(struct dp_power_private * power,struct dss_clk * clk_arry,int num_clk,int enable)153 static int dp_power_clk_set_link_rate(struct dp_power_private *power,
154 struct dss_clk *clk_arry, int num_clk, int enable)
155 {
156 u32 rate;
157 int i, rc = 0;
158
159 for (i = 0; i < num_clk; i++) {
160 if (clk_arry[i].clk) {
161 if (clk_arry[i].type == DSS_CLK_PCLK) {
162 if (enable)
163 rate = clk_arry[i].rate;
164 else
165 rate = 0;
166
167 rc = dev_pm_opp_set_rate(power->dev, rate);
168 if (rc)
169 break;
170 }
171
172 }
173 }
174 return rc;
175 }
176
dp_power_clk_set_rate(struct dp_power_private * power,enum dp_pm_type module,bool enable)177 static int dp_power_clk_set_rate(struct dp_power_private *power,
178 enum dp_pm_type module, bool enable)
179 {
180 int rc = 0;
181 struct dss_module_power *mp = &power->parser->mp[module];
182
183 if (module == DP_CTRL_PM) {
184 rc = dp_power_clk_set_link_rate(power, mp->clk_config, mp->num_clk, enable);
185 if (rc) {
186 DRM_ERROR("failed to set link clks rate\n");
187 return rc;
188 }
189 } else {
190
191 if (enable) {
192 rc = msm_dss_clk_set_rate(mp->clk_config, mp->num_clk);
193 if (rc) {
194 DRM_ERROR("failed to set clks rate\n");
195 return rc;
196 }
197 }
198 }
199
200 rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, enable);
201 if (rc) {
202 DRM_ERROR("failed to %d clks, err: %d\n", enable, rc);
203 return rc;
204 }
205
206 return 0;
207 }
208
dp_power_clk_status(struct dp_power * dp_power,enum dp_pm_type pm_type)209 int dp_power_clk_status(struct dp_power *dp_power, enum dp_pm_type pm_type)
210 {
211 DRM_DEBUG_DP("core_clk_on=%d link_clk_on=%d stream_clk_on=%d\n",
212 dp_power->core_clks_on, dp_power->link_clks_on, dp_power->stream_clks_on);
213
214 if (pm_type == DP_CORE_PM)
215 return dp_power->core_clks_on;
216
217 if (pm_type == DP_CTRL_PM)
218 return dp_power->link_clks_on;
219
220 if (pm_type == DP_STREAM_PM)
221 return dp_power->stream_clks_on;
222
223 return 0;
224 }
225
dp_power_clk_enable(struct dp_power * dp_power,enum dp_pm_type pm_type,bool enable)226 int dp_power_clk_enable(struct dp_power *dp_power,
227 enum dp_pm_type pm_type, bool enable)
228 {
229 int rc = 0;
230 struct dp_power_private *power;
231
232 power = container_of(dp_power, struct dp_power_private, dp_power);
233
234 if (pm_type != DP_CORE_PM && pm_type != DP_CTRL_PM &&
235 pm_type != DP_STREAM_PM) {
236 DRM_ERROR("unsupported power module: %s\n",
237 dp_parser_pm_name(pm_type));
238 return -EINVAL;
239 }
240
241 if (enable) {
242 if (pm_type == DP_CORE_PM && dp_power->core_clks_on) {
243 DRM_DEBUG_DP("core clks already enabled\n");
244 return 0;
245 }
246
247 if (pm_type == DP_CTRL_PM && dp_power->link_clks_on) {
248 DRM_DEBUG_DP("links clks already enabled\n");
249 return 0;
250 }
251
252 if (pm_type == DP_STREAM_PM && dp_power->stream_clks_on) {
253 DRM_DEBUG_DP("pixel clks already enabled\n");
254 return 0;
255 }
256
257 if ((pm_type == DP_CTRL_PM) && (!dp_power->core_clks_on)) {
258 DRM_DEBUG_DP("Enable core clks before link clks\n");
259
260 rc = dp_power_clk_set_rate(power, DP_CORE_PM, enable);
261 if (rc) {
262 DRM_ERROR("fail to enable clks: %s. err=%d\n",
263 dp_parser_pm_name(DP_CORE_PM), rc);
264 return rc;
265 }
266 dp_power->core_clks_on = true;
267 }
268 }
269
270 rc = dp_power_clk_set_rate(power, pm_type, enable);
271 if (rc) {
272 DRM_ERROR("failed to '%s' clks for: %s. err=%d\n",
273 enable ? "enable" : "disable",
274 dp_parser_pm_name(pm_type), rc);
275 return rc;
276 }
277
278 if (pm_type == DP_CORE_PM)
279 dp_power->core_clks_on = enable;
280 else if (pm_type == DP_STREAM_PM)
281 dp_power->stream_clks_on = enable;
282 else
283 dp_power->link_clks_on = enable;
284
285 DRM_DEBUG_DP("%s clocks for %s\n",
286 enable ? "enable" : "disable",
287 dp_parser_pm_name(pm_type));
288 DRM_DEBUG_DP("strem_clks:%s link_clks:%s core_clks:%s\n",
289 dp_power->stream_clks_on ? "on" : "off",
290 dp_power->link_clks_on ? "on" : "off",
291 dp_power->core_clks_on ? "on" : "off");
292
293 return 0;
294 }
295
dp_power_client_init(struct dp_power * dp_power)296 int dp_power_client_init(struct dp_power *dp_power)
297 {
298 int rc = 0;
299 struct dp_power_private *power;
300
301 if (!dp_power) {
302 DRM_ERROR("invalid power data\n");
303 return -EINVAL;
304 }
305
306 power = container_of(dp_power, struct dp_power_private, dp_power);
307
308 pm_runtime_enable(&power->pdev->dev);
309
310 rc = dp_power_regulator_init(power);
311 if (rc) {
312 DRM_ERROR("failed to init regulators %d\n", rc);
313 goto error;
314 }
315
316 rc = dp_power_clk_init(power);
317 if (rc) {
318 DRM_ERROR("failed to init clocks %d\n", rc);
319 goto error;
320 }
321 return 0;
322
323 error:
324 pm_runtime_disable(&power->pdev->dev);
325 return rc;
326 }
327
dp_power_client_deinit(struct dp_power * dp_power)328 void dp_power_client_deinit(struct dp_power *dp_power)
329 {
330 struct dp_power_private *power;
331
332 if (!dp_power) {
333 DRM_ERROR("invalid power data\n");
334 return;
335 }
336
337 power = container_of(dp_power, struct dp_power_private, dp_power);
338
339 dp_power_clk_deinit(power);
340 pm_runtime_disable(&power->pdev->dev);
341
342 }
343
dp_power_init(struct dp_power * dp_power,bool flip)344 int dp_power_init(struct dp_power *dp_power, bool flip)
345 {
346 int rc = 0;
347 struct dp_power_private *power = NULL;
348
349 if (!dp_power) {
350 DRM_ERROR("invalid power data\n");
351 return -EINVAL;
352 }
353
354 power = container_of(dp_power, struct dp_power_private, dp_power);
355
356 pm_runtime_get_sync(&power->pdev->dev);
357 rc = dp_power_regulator_enable(power);
358 if (rc) {
359 DRM_ERROR("failed to enable regulators, %d\n", rc);
360 goto exit;
361 }
362
363 rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
364 if (rc) {
365 DRM_ERROR("failed to enable DP core clocks, %d\n", rc);
366 goto err_clk;
367 }
368
369 return 0;
370
371 err_clk:
372 dp_power_regulator_disable(power);
373 exit:
374 pm_runtime_put_sync(&power->pdev->dev);
375 return rc;
376 }
377
dp_power_deinit(struct dp_power * dp_power)378 int dp_power_deinit(struct dp_power *dp_power)
379 {
380 struct dp_power_private *power;
381
382 power = container_of(dp_power, struct dp_power_private, dp_power);
383
384 dp_power_clk_enable(dp_power, DP_CORE_PM, false);
385 dp_power_regulator_disable(power);
386 pm_runtime_put_sync(&power->pdev->dev);
387 return 0;
388 }
389
dp_power_get(struct device * dev,struct dp_parser * parser)390 struct dp_power *dp_power_get(struct device *dev, struct dp_parser *parser)
391 {
392 struct dp_power_private *power;
393 struct dp_power *dp_power;
394
395 if (!parser) {
396 DRM_ERROR("invalid input\n");
397 return ERR_PTR(-EINVAL);
398 }
399
400 power = devm_kzalloc(&parser->pdev->dev, sizeof(*power), GFP_KERNEL);
401 if (!power)
402 return ERR_PTR(-ENOMEM);
403
404 power->parser = parser;
405 power->pdev = parser->pdev;
406 power->dev = dev;
407
408 dp_power = &power->dp_power;
409
410 return dp_power;
411 }
412