tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) STMicroelectronics SA 2017
4 *
5 * Authors: Philippe Cornu <philippe.cornu@st.com>
6 * Yannick Fertre <yannick.fertre@st.com>
7 * Fabien Dessenne <fabien.dessenne@st.com>
8 * Mickael Reulier <mickael.reulier@st.com>
9 */
10
11#include <linux/component.h>
12#include <linux/dma-mapping.h>
13#include <linux/module.h>
14#include <linux/of_platform.h>
15#include <linux/pm_runtime.h>
16
17#include <drm/drm_aperture.h>
18#include <drm/drm_atomic.h>
19#include <drm/drm_atomic_helper.h>
20#include <drm/drm_drv.h>
21#include <drm/drm_fb_cma_helper.h>
22#include <drm/drm_fb_helper.h>
23#include <drm/drm_gem_cma_helper.h>
24#include <drm/drm_gem_framebuffer_helper.h>
25#include <drm/drm_module.h>
26#include <drm/drm_probe_helper.h>
27#include <drm/drm_vblank.h>
28
29#include "ltdc.h"
30
31#define STM_MAX_FB_WIDTH 2048
32#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
33
34static const struct drm_mode_config_funcs drv_mode_config_funcs = {
35 .fb_create = drm_gem_fb_create,
36 .atomic_check = drm_atomic_helper_check,
37 .atomic_commit = drm_atomic_helper_commit,
38};
39
40static int stm_gem_cma_dumb_create(struct drm_file *file,
41 struct drm_device *dev,
42 struct drm_mode_create_dumb *args)
43{
44 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
45
46 /*
47 * in order to optimize data transfer, pitch is aligned on
48 * 128 bytes, height is aligned on 4 bytes
49 */
50 args->pitch = roundup(min_pitch, 128);
51 args->height = roundup(args->height, 4);
52
53 return drm_gem_cma_dumb_create_internal(file, dev, args);
54}
55
56DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
57
58static const struct drm_driver drv_driver = {
59 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
60 .name = "stm",
61 .desc = "STMicroelectronics SoC DRM",
62 .date = "20170330",
63 .major = 1,
64 .minor = 0,
65 .patchlevel = 0,
66 .fops = &drv_driver_fops,
67 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_cma_dumb_create),
68};
69
70static int drv_load(struct drm_device *ddev)
71{
72 struct platform_device *pdev = to_platform_device(ddev->dev);
73 struct ltdc_device *ldev;
74 int ret;
75
76 DRM_DEBUG("%s\n", __func__);
77
78 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
79 if (!ldev)
80 return -ENOMEM;
81
82 ddev->dev_private = (void *)ldev;
83
84 ret = drmm_mode_config_init(ddev);
85 if (ret)
86 return ret;
87
88 /*
89 * set max width and height as default value.
90 * this value would be used to check framebuffer size limitation
91 * at drm_mode_addfb().
92 */
93 ddev->mode_config.min_width = 0;
94 ddev->mode_config.min_height = 0;
95 ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
96 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
97 ddev->mode_config.funcs = &drv_mode_config_funcs;
98 ddev->mode_config.normalize_zpos = true;
99
100 ret = ltdc_load(ddev);
101 if (ret)
102 return ret;
103
104 drm_mode_config_reset(ddev);
105 drm_kms_helper_poll_init(ddev);
106
107 platform_set_drvdata(pdev, ddev);
108
109 return 0;
110}
111
112static void drv_unload(struct drm_device *ddev)
113{
114 DRM_DEBUG("%s\n", __func__);
115
116 drm_kms_helper_poll_fini(ddev);
117 ltdc_unload(ddev);
118}
119
120static __maybe_unused int drv_suspend(struct device *dev)
121{
122 struct drm_device *ddev = dev_get_drvdata(dev);
123 struct ltdc_device *ldev = ddev->dev_private;
124 struct drm_atomic_state *state;
125
126 WARN_ON(ldev->suspend_state);
127
128 state = drm_atomic_helper_suspend(ddev);
129 if (IS_ERR(state))
130 return PTR_ERR(state);
131
132 ldev->suspend_state = state;
133 pm_runtime_force_suspend(dev);
134
135 return 0;
136}
137
138static __maybe_unused int drv_resume(struct device *dev)
139{
140 struct drm_device *ddev = dev_get_drvdata(dev);
141 struct ltdc_device *ldev = ddev->dev_private;
142 int ret;
143
144 if (WARN_ON(!ldev->suspend_state))
145 return -ENOENT;
146
147 pm_runtime_force_resume(dev);
148 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
149 if (ret)
150 pm_runtime_force_suspend(dev);
151
152 ldev->suspend_state = NULL;
153
154 return ret;
155}
156
157static __maybe_unused int drv_runtime_suspend(struct device *dev)
158{
159 struct drm_device *ddev = dev_get_drvdata(dev);
160
161 DRM_DEBUG_DRIVER("\n");
162 ltdc_suspend(ddev);
163
164 return 0;
165}
166
167static __maybe_unused int drv_runtime_resume(struct device *dev)
168{
169 struct drm_device *ddev = dev_get_drvdata(dev);
170
171 DRM_DEBUG_DRIVER("\n");
172 return ltdc_resume(ddev);
173}
174
175static const struct dev_pm_ops drv_pm_ops = {
176 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
177 SET_RUNTIME_PM_OPS(drv_runtime_suspend,
178 drv_runtime_resume, NULL)
179};
180
181static int stm_drm_platform_probe(struct platform_device *pdev)
182{
183 struct device *dev = &pdev->dev;
184 struct drm_device *ddev;
185 int ret;
186
187 DRM_DEBUG("%s\n", __func__);
188
189 ret = drm_aperture_remove_framebuffers(false, &drv_driver);
190 if (ret)
191 return ret;
192
193 dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
194
195 ddev = drm_dev_alloc(&drv_driver, dev);
196 if (IS_ERR(ddev))
197 return PTR_ERR(ddev);
198
199 ret = drv_load(ddev);
200 if (ret)
201 goto err_put;
202
203 ret = drm_dev_register(ddev, 0);
204 if (ret)
205 goto err_put;
206
207 drm_fbdev_generic_setup(ddev, 16);
208
209 return 0;
210
211err_put:
212 drm_dev_put(ddev);
213
214 return ret;
215}
216
217static int stm_drm_platform_remove(struct platform_device *pdev)
218{
219 struct drm_device *ddev = platform_get_drvdata(pdev);
220
221 DRM_DEBUG("%s\n", __func__);
222
223 drm_dev_unregister(ddev);
224 drv_unload(ddev);
225 drm_dev_put(ddev);
226
227 return 0;
228}
229
230static const struct of_device_id drv_dt_ids[] = {
231 { .compatible = "st,stm32-ltdc"},
232 { /* end node */ },
233};
234MODULE_DEVICE_TABLE(of, drv_dt_ids);
235
236static struct platform_driver stm_drm_platform_driver = {
237 .probe = stm_drm_platform_probe,
238 .remove = stm_drm_platform_remove,
239 .driver = {
240 .name = "stm32-display",
241 .of_match_table = drv_dt_ids,
242 .pm = &drv_pm_ops,
243 },
244};
245
246drm_module_platform_driver(stm_drm_platform_driver);
247
248MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
249MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
250MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
251MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
252MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
253MODULE_LICENSE("GPL v2");