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/aperture.h>
12#include <linux/component.h>
13#include <linux/dma-mapping.h>
14#include <linux/mod_devicetable.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/pm_runtime.h>
18
19#include <drm/clients/drm_client_setup.h>
20#include <drm/drm_atomic.h>
21#include <drm/drm_atomic_helper.h>
22#include <drm/drm_drv.h>
23#include <drm/drm_fbdev_dma.h>
24#include <drm/drm_fourcc.h>
25#include <drm/drm_gem_dma_helper.h>
26#include <drm/drm_gem_framebuffer_helper.h>
27#include <drm/drm_module.h>
28#include <drm/drm_probe_helper.h>
29#include <drm/drm_vblank.h>
30#include <drm/drm_managed.h>
31
32#include "ltdc.h"
33
34#define STM_MAX_FB_WIDTH 2048
35#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
36
37static const struct drm_mode_config_funcs drv_mode_config_funcs = {
38 .fb_create = drm_gem_fb_create,
39 .atomic_check = drm_atomic_helper_check,
40 .atomic_commit = drm_atomic_helper_commit,
41};
42
43static int stm_gem_dma_dumb_create(struct drm_file *file,
44 struct drm_device *dev,
45 struct drm_mode_create_dumb *args)
46{
47 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
48
49 /*
50 * in order to optimize data transfer, pitch is aligned on
51 * 128 bytes, height is aligned on 4 bytes
52 */
53 args->pitch = roundup(min_pitch, 128);
54 args->height = roundup(args->height, 4);
55
56 return drm_gem_dma_dumb_create_internal(file, dev, args);
57}
58
59DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops);
60
61static const struct drm_driver drv_driver = {
62 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
63 .name = "stm",
64 .desc = "STMicroelectronics SoC DRM",
65 .major = 1,
66 .minor = 0,
67 .patchlevel = 0,
68 .fops = &drv_driver_fops,
69 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create),
70 DRM_FBDEV_DMA_DRIVER_OPS,
71};
72
73static int drv_load(struct drm_device *ddev)
74{
75 struct platform_device *pdev = to_platform_device(ddev->dev);
76 struct ltdc_device *ldev;
77 int ret;
78
79 DRM_DEBUG("%s\n", __func__);
80
81 ldev = drmm_kzalloc(ddev, sizeof(*ldev), GFP_KERNEL);
82 if (!ldev)
83 return -ENOMEM;
84
85 ddev->dev_private = (void *)ldev;
86
87 ret = drmm_mode_config_init(ddev);
88 if (ret)
89 return ret;
90
91 /*
92 * set max width and height as default value.
93 * this value would be used to check framebuffer size limitation
94 * at drm_mode_addfb().
95 */
96 ddev->mode_config.min_width = 0;
97 ddev->mode_config.min_height = 0;
98 ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
99 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
100 ddev->mode_config.funcs = &drv_mode_config_funcs;
101 ddev->mode_config.normalize_zpos = true;
102
103 ret = ltdc_load(ddev);
104 if (ret)
105 return ret;
106
107 drm_mode_config_reset(ddev);
108 drm_kms_helper_poll_init(ddev);
109
110 platform_set_drvdata(pdev, ddev);
111
112 return 0;
113}
114
115static void drv_unload(struct drm_device *ddev)
116{
117 DRM_DEBUG("%s\n", __func__);
118
119 drm_kms_helper_poll_fini(ddev);
120 drm_atomic_helper_shutdown(ddev);
121 ltdc_unload(ddev);
122}
123
124static __maybe_unused int drv_suspend(struct device *dev)
125{
126 struct drm_device *ddev = dev_get_drvdata(dev);
127 struct ltdc_device *ldev = ddev->dev_private;
128 struct drm_atomic_state *state;
129
130 WARN_ON(ldev->suspend_state);
131
132 state = drm_atomic_helper_suspend(ddev);
133 if (IS_ERR(state))
134 return PTR_ERR(state);
135
136 ldev->suspend_state = state;
137 pm_runtime_force_suspend(dev);
138
139 return 0;
140}
141
142static __maybe_unused int drv_resume(struct device *dev)
143{
144 struct drm_device *ddev = dev_get_drvdata(dev);
145 struct ltdc_device *ldev = ddev->dev_private;
146 int ret;
147
148 if (WARN_ON(!ldev->suspend_state))
149 return -ENOENT;
150
151 pm_runtime_force_resume(dev);
152 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
153 if (ret)
154 pm_runtime_force_suspend(dev);
155
156 ldev->suspend_state = NULL;
157
158 return ret;
159}
160
161static __maybe_unused int drv_runtime_suspend(struct device *dev)
162{
163 struct drm_device *ddev = dev_get_drvdata(dev);
164
165 DRM_DEBUG_DRIVER("\n");
166 ltdc_suspend(ddev);
167
168 return 0;
169}
170
171static __maybe_unused int drv_runtime_resume(struct device *dev)
172{
173 struct drm_device *ddev = dev_get_drvdata(dev);
174
175 DRM_DEBUG_DRIVER("\n");
176 return ltdc_resume(ddev);
177}
178
179static const struct dev_pm_ops drv_pm_ops = {
180 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
181 SET_RUNTIME_PM_OPS(drv_runtime_suspend,
182 drv_runtime_resume, NULL)
183};
184
185static int stm_drm_platform_probe(struct platform_device *pdev)
186{
187 struct device *dev = &pdev->dev;
188 struct drm_device *ddev;
189 int ret;
190
191 DRM_DEBUG("%s\n", __func__);
192
193 ret = aperture_remove_all_conflicting_devices(drv_driver.name);
194 if (ret)
195 return ret;
196
197 dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
198
199 ddev = drm_dev_alloc(&drv_driver, dev);
200 if (IS_ERR(ddev))
201 return PTR_ERR(ddev);
202
203 ret = drv_load(ddev);
204 if (ret)
205 goto err_put;
206
207 ret = drm_dev_register(ddev, 0);
208 if (ret)
209 goto err_unload;
210
211 drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565);
212
213 return 0;
214
215err_unload:
216 drv_unload(ddev);
217err_put:
218 drm_dev_put(ddev);
219
220 return ret;
221}
222
223static void stm_drm_platform_remove(struct platform_device *pdev)
224{
225 struct drm_device *ddev = platform_get_drvdata(pdev);
226
227 DRM_DEBUG("%s\n", __func__);
228
229 drm_dev_unregister(ddev);
230 drv_unload(ddev);
231 drm_dev_put(ddev);
232}
233
234static void stm_drm_platform_shutdown(struct platform_device *pdev)
235{
236 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
237}
238
239static const struct of_device_id drv_dt_ids[] = {
240 { .compatible = "st,stm32-ltdc"},
241 { /* end node */ },
242};
243MODULE_DEVICE_TABLE(of, drv_dt_ids);
244
245static struct platform_driver stm_drm_platform_driver = {
246 .probe = stm_drm_platform_probe,
247 .remove = stm_drm_platform_remove,
248 .shutdown = stm_drm_platform_shutdown,
249 .driver = {
250 .name = "stm32-display",
251 .of_match_table = drv_dt_ids,
252 .pm = &drv_pm_ops,
253 },
254};
255
256drm_module_platform_driver(stm_drm_platform_driver);
257
258MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
259MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
260MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
261MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
262MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
263MODULE_LICENSE("GPL v2");