tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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/mod_devicetable.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/pm_runtime.h>
17
18#include <drm/drm_aperture.h>
19#include <drm/drm_atomic.h>
20#include <drm/drm_atomic_helper.h>
21#include <drm/drm_drv.h>
22#include <drm/drm_fbdev_dma.h>
23#include <drm/drm_gem_dma_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#include <drm/drm_managed.h>
29
30#include "ltdc.h"
31
32#define STM_MAX_FB_WIDTH 2048
33#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
34
35static const struct drm_mode_config_funcs drv_mode_config_funcs = {
36 .fb_create = drm_gem_fb_create,
37 .atomic_check = drm_atomic_helper_check,
38 .atomic_commit = drm_atomic_helper_commit,
39};
40
41static int stm_gem_dma_dumb_create(struct drm_file *file,
42 struct drm_device *dev,
43 struct drm_mode_create_dumb *args)
44{
45 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
46
47 /*
48 * in order to optimize data transfer, pitch is aligned on
49 * 128 bytes, height is aligned on 4 bytes
50 */
51 args->pitch = roundup(min_pitch, 128);
52 args->height = roundup(args->height, 4);
53
54 return drm_gem_dma_dumb_create_internal(file, dev, args);
55}
56
57DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops);
58
59static const struct drm_driver drv_driver = {
60 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
61 .name = "stm",
62 .desc = "STMicroelectronics SoC DRM",
63 .date = "20170330",
64 .major = 1,
65 .minor = 0,
66 .patchlevel = 0,
67 .fops = &drv_driver_fops,
68 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create),
69};
70
71static int drv_load(struct drm_device *ddev)
72{
73 struct platform_device *pdev = to_platform_device(ddev->dev);
74 struct ltdc_device *ldev;
75 int ret;
76
77 DRM_DEBUG("%s\n", __func__);
78
79 ldev = drmm_kzalloc(ddev, sizeof(*ldev), GFP_KERNEL);
80 if (!ldev)
81 return -ENOMEM;
82
83 ddev->dev_private = (void *)ldev;
84
85 ret = drmm_mode_config_init(ddev);
86 if (ret)
87 return ret;
88
89 /*
90 * set max width and height as default value.
91 * this value would be used to check framebuffer size limitation
92 * at drm_mode_addfb().
93 */
94 ddev->mode_config.min_width = 0;
95 ddev->mode_config.min_height = 0;
96 ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
97 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
98 ddev->mode_config.funcs = &drv_mode_config_funcs;
99 ddev->mode_config.normalize_zpos = true;
100
101 ret = ltdc_load(ddev);
102 if (ret)
103 return ret;
104
105 drm_mode_config_reset(ddev);
106 drm_kms_helper_poll_init(ddev);
107
108 platform_set_drvdata(pdev, ddev);
109
110 return 0;
111}
112
113static void drv_unload(struct drm_device *ddev)
114{
115 DRM_DEBUG("%s\n", __func__);
116
117 drm_kms_helper_poll_fini(ddev);
118 drm_atomic_helper_shutdown(ddev);
119 ltdc_unload(ddev);
120}
121
122static __maybe_unused int drv_suspend(struct device *dev)
123{
124 struct drm_device *ddev = dev_get_drvdata(dev);
125 struct ltdc_device *ldev = ddev->dev_private;
126 struct drm_atomic_state *state;
127
128 WARN_ON(ldev->suspend_state);
129
130 state = drm_atomic_helper_suspend(ddev);
131 if (IS_ERR(state))
132 return PTR_ERR(state);
133
134 ldev->suspend_state = state;
135 pm_runtime_force_suspend(dev);
136
137 return 0;
138}
139
140static __maybe_unused int drv_resume(struct device *dev)
141{
142 struct drm_device *ddev = dev_get_drvdata(dev);
143 struct ltdc_device *ldev = ddev->dev_private;
144 int ret;
145
146 if (WARN_ON(!ldev->suspend_state))
147 return -ENOENT;
148
149 pm_runtime_force_resume(dev);
150 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
151 if (ret)
152 pm_runtime_force_suspend(dev);
153
154 ldev->suspend_state = NULL;
155
156 return ret;
157}
158
159static __maybe_unused int drv_runtime_suspend(struct device *dev)
160{
161 struct drm_device *ddev = dev_get_drvdata(dev);
162
163 DRM_DEBUG_DRIVER("\n");
164 ltdc_suspend(ddev);
165
166 return 0;
167}
168
169static __maybe_unused int drv_runtime_resume(struct device *dev)
170{
171 struct drm_device *ddev = dev_get_drvdata(dev);
172
173 DRM_DEBUG_DRIVER("\n");
174 return ltdc_resume(ddev);
175}
176
177static const struct dev_pm_ops drv_pm_ops = {
178 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
179 SET_RUNTIME_PM_OPS(drv_runtime_suspend,
180 drv_runtime_resume, NULL)
181};
182
183static int stm_drm_platform_probe(struct platform_device *pdev)
184{
185 struct device *dev = &pdev->dev;
186 struct drm_device *ddev;
187 int ret;
188
189 DRM_DEBUG("%s\n", __func__);
190
191 ret = drm_aperture_remove_framebuffers(&drv_driver);
192 if (ret)
193 return ret;
194
195 dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
196
197 ddev = drm_dev_alloc(&drv_driver, dev);
198 if (IS_ERR(ddev))
199 return PTR_ERR(ddev);
200
201 ret = drv_load(ddev);
202 if (ret)
203 goto err_put;
204
205 ret = drm_dev_register(ddev, 0);
206 if (ret)
207 goto err_unload;
208
209 drm_fbdev_dma_setup(ddev, 16);
210
211 return 0;
212
213err_unload:
214 drv_unload(ddev);
215err_put:
216 drm_dev_put(ddev);
217
218 return ret;
219}
220
221static void stm_drm_platform_remove(struct platform_device *pdev)
222{
223 struct drm_device *ddev = platform_get_drvdata(pdev);
224
225 DRM_DEBUG("%s\n", __func__);
226
227 drm_dev_unregister(ddev);
228 drv_unload(ddev);
229 drm_dev_put(ddev);
230}
231
232static void stm_drm_platform_shutdown(struct platform_device *pdev)
233{
234 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
235}
236
237static const struct of_device_id drv_dt_ids[] = {
238 { .compatible = "st,stm32-ltdc"},
239 { /* end node */ },
240};
241MODULE_DEVICE_TABLE(of, drv_dt_ids);
242
243static struct platform_driver stm_drm_platform_driver = {
244 .probe = stm_drm_platform_probe,
245 .remove_new = stm_drm_platform_remove,
246 .shutdown = stm_drm_platform_shutdown,
247 .driver = {
248 .name = "stm32-display",
249 .of_match_table = drv_dt_ids,
250 .pm = &drv_pm_ops,
251 },
252};
253
254drm_module_platform_driver(stm_drm_platform_driver);
255
256MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
257MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
258MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
259MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
260MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
261MODULE_LICENSE("GPL v2");