1 // SPDX-License-Identifier: GPL-2.0
7 #include <linux/of_device.h>
8 #include <linux/of_graph.h>
9 #include <linux/pm_runtime.h>
10 #include <linux/slab.h>
11 #include <drm/drm_bridge_connector.h>
12 #include <drm/drm_device.h>
13 #include <drm/drm_modeset_helper.h>
18 static void dcss_clocks_enable(struct dcss_dev *dcss)
20 clk_prepare_enable(dcss->axi_clk);
21 clk_prepare_enable(dcss->apb_clk);
22 clk_prepare_enable(dcss->rtrm_clk);
23 clk_prepare_enable(dcss->dtrc_clk);
24 clk_prepare_enable(dcss->pix_clk);
27 static void dcss_clocks_disable(struct dcss_dev *dcss)
29 clk_disable_unprepare(dcss->pix_clk);
30 clk_disable_unprepare(dcss->dtrc_clk);
31 clk_disable_unprepare(dcss->rtrm_clk);
32 clk_disable_unprepare(dcss->apb_clk);
33 clk_disable_unprepare(dcss->axi_clk);
36 static void dcss_disable_dtg_and_ss_cb(void *data)
38 struct dcss_dev *dcss = data;
40 dcss->disable_callback = NULL;
42 dcss_ss_shutoff(dcss->ss);
43 dcss_dtg_shutoff(dcss->dtg);
45 complete(&dcss->disable_completion);
48 void dcss_disable_dtg_and_ss(struct dcss_dev *dcss)
50 dcss->disable_callback = dcss_disable_dtg_and_ss_cb;
53 void dcss_enable_dtg_and_ss(struct dcss_dev *dcss)
55 if (dcss->disable_callback)
56 dcss->disable_callback = NULL;
58 dcss_dtg_enable(dcss->dtg);
59 dcss_ss_enable(dcss->ss);
62 static int dcss_submodules_init(struct dcss_dev *dcss)
65 u32 base_addr = dcss->start_addr;
66 const struct dcss_type_data *devtype = dcss->devtype;
68 dcss_clocks_enable(dcss);
70 ret = dcss_blkctl_init(dcss, base_addr + devtype->blkctl_ofs);
74 ret = dcss_ctxld_init(dcss, base_addr + devtype->ctxld_ofs);
78 ret = dcss_dtg_init(dcss, base_addr + devtype->dtg_ofs);
82 ret = dcss_ss_init(dcss, base_addr + devtype->ss_ofs);
86 ret = dcss_dpr_init(dcss, base_addr + devtype->dpr_ofs);
90 ret = dcss_scaler_init(dcss, base_addr + devtype->scaler_ofs);
94 dcss_clocks_disable(dcss);
99 dcss_dpr_exit(dcss->dpr);
102 dcss_ss_exit(dcss->ss);
105 dcss_dtg_exit(dcss->dtg);
108 dcss_ctxld_exit(dcss->ctxld);
111 dcss_blkctl_exit(dcss->blkctl);
113 dcss_clocks_disable(dcss);
118 static void dcss_submodules_stop(struct dcss_dev *dcss)
120 dcss_clocks_enable(dcss);
121 dcss_scaler_exit(dcss->scaler);
122 dcss_dpr_exit(dcss->dpr);
123 dcss_ss_exit(dcss->ss);
124 dcss_dtg_exit(dcss->dtg);
125 dcss_ctxld_exit(dcss->ctxld);
126 dcss_blkctl_exit(dcss->blkctl);
127 dcss_clocks_disable(dcss);
130 static int dcss_clks_init(struct dcss_dev *dcss)
137 {"apb", &dcss->apb_clk},
138 {"axi", &dcss->axi_clk},
139 {"pix", &dcss->pix_clk},
140 {"rtrm", &dcss->rtrm_clk},
141 {"dtrc", &dcss->dtrc_clk},
144 for (i = 0; i < ARRAY_SIZE(clks); i++) {
145 *clks[i].clk = devm_clk_get(dcss->dev, clks[i].id);
146 if (IS_ERR(*clks[i].clk)) {
147 dev_err(dcss->dev, "failed to get %s clock\n",
149 return PTR_ERR(*clks[i].clk);
156 static void dcss_clks_release(struct dcss_dev *dcss)
158 devm_clk_put(dcss->dev, dcss->dtrc_clk);
159 devm_clk_put(dcss->dev, dcss->rtrm_clk);
160 devm_clk_put(dcss->dev, dcss->pix_clk);
161 devm_clk_put(dcss->dev, dcss->axi_clk);
162 devm_clk_put(dcss->dev, dcss->apb_clk);
165 struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
167 struct platform_device *pdev = to_platform_device(dev);
169 struct resource *res;
170 struct dcss_dev *dcss;
171 const struct dcss_type_data *devtype;
173 devtype = of_device_get_match_data(dev);
175 dev_err(dev, "no device match found\n");
176 return ERR_PTR(-ENODEV);
179 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
181 dev_err(dev, "cannot get memory resource\n");
182 return ERR_PTR(-EINVAL);
185 dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
187 return ERR_PTR(-ENOMEM);
190 dcss->devtype = devtype;
191 dcss->hdmi_output = hdmi_output;
193 ret = dcss_clks_init(dcss);
195 dev_err(dev, "clocks initialization failed\n");
199 dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0);
200 if (!dcss->of_port) {
201 dev_err(dev, "no port@0 node in %s\n", dev->of_node->full_name);
206 dcss->start_addr = res->start;
208 ret = dcss_submodules_init(dcss);
210 of_node_put(dcss->of_port);
211 dev_err(dev, "submodules initialization failed\n");
215 init_completion(&dcss->disable_completion);
217 pm_runtime_set_autosuspend_delay(dev, 100);
218 pm_runtime_use_autosuspend(dev);
219 pm_runtime_set_suspended(dev);
220 pm_runtime_allow(dev);
221 pm_runtime_enable(dev);
226 dcss_clks_release(dcss);
234 void dcss_dev_destroy(struct dcss_dev *dcss)
236 if (!pm_runtime_suspended(dcss->dev)) {
237 dcss_ctxld_suspend(dcss->ctxld);
238 dcss_clocks_disable(dcss);
241 of_node_put(dcss->of_port);
243 pm_runtime_disable(dcss->dev);
245 dcss_submodules_stop(dcss);
247 dcss_clks_release(dcss);
252 static int dcss_dev_suspend(struct device *dev)
254 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
255 struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
256 struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base);
259 drm_bridge_connector_disable_hpd(kms->connector);
261 drm_mode_config_helper_suspend(ddev);
263 if (pm_runtime_suspended(dev))
266 ret = dcss_ctxld_suspend(dcss->ctxld);
270 dcss_clocks_disable(dcss);
275 static int dcss_dev_resume(struct device *dev)
277 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
278 struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
279 struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base);
281 if (pm_runtime_suspended(dev)) {
282 drm_mode_config_helper_resume(ddev);
286 dcss_clocks_enable(dcss);
288 dcss_blkctl_cfg(dcss->blkctl);
290 dcss_ctxld_resume(dcss->ctxld);
292 drm_mode_config_helper_resume(ddev);
294 drm_bridge_connector_enable_hpd(kms->connector);
299 static int dcss_dev_runtime_suspend(struct device *dev)
301 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
304 ret = dcss_ctxld_suspend(dcss->ctxld);
308 dcss_clocks_disable(dcss);
313 static int dcss_dev_runtime_resume(struct device *dev)
315 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
317 dcss_clocks_enable(dcss);
319 dcss_blkctl_cfg(dcss->blkctl);
321 dcss_ctxld_resume(dcss->ctxld);
326 EXPORT_GPL_DEV_PM_OPS(dcss_dev_pm_ops) = {
327 RUNTIME_PM_OPS(dcss_dev_runtime_suspend, dcss_dev_runtime_resume, NULL)
328 SYSTEM_SLEEP_PM_OPS(dcss_dev_suspend, dcss_dev_resume)