1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
4  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
5  */
6 
7 #include <drm/drm_atomic.h>
8 #include <drm/drm_atomic_helper.h>
9 #include <drm/drm_crtc.h>
10 #include <drm/drm_crtc_helper.h>
11 #include <drm/drm_fourcc.h>
12 #include <drm/drm_fb_cma_helper.h>
13 #include <drm/drm_gem_atomic_helper.h>
14 
15 #include "tidss_crtc.h"
16 #include "tidss_dispc.h"
17 #include "tidss_drv.h"
18 #include "tidss_plane.h"
19 
20 /* drm_plane_helper_funcs */
21 
22 static int tidss_plane_atomic_check(struct drm_plane *plane,
23 				    struct drm_atomic_state *state)
24 {
25 	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
26 										 plane);
27 	struct drm_device *ddev = plane->dev;
28 	struct tidss_device *tidss = to_tidss(ddev);
29 	struct tidss_plane *tplane = to_tidss_plane(plane);
30 	const struct drm_format_info *finfo;
31 	struct drm_crtc_state *crtc_state;
32 	u32 hw_plane = tplane->hw_plane_id;
33 	u32 hw_videoport;
34 	int ret;
35 
36 	dev_dbg(ddev->dev, "%s\n", __func__);
37 
38 	if (!new_plane_state->crtc) {
39 		/*
40 		 * The visible field is not reset by the DRM core but only
41 		 * updated by drm_plane_helper_check_state(), set it manually.
42 		 */
43 		new_plane_state->visible = false;
44 		return 0;
45 	}
46 
47 	crtc_state = drm_atomic_get_crtc_state(state,
48 					       new_plane_state->crtc);
49 	if (IS_ERR(crtc_state))
50 		return PTR_ERR(crtc_state);
51 
52 	ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state,
53 						  0,
54 						  INT_MAX, true, true);
55 	if (ret < 0)
56 		return ret;
57 
58 	/*
59 	 * The HW is only able to start drawing at subpixel boundary
60 	 * (the two first checks bellow). At the end of a row the HW
61 	 * can only jump integer number of subpixels forward to the
62 	 * beginning of the next row. So we can only show picture with
63 	 * integer subpixel width (the third check). However, after
64 	 * reaching the end of the drawn picture the drawing starts
65 	 * again at the absolute memory address where top left corner
66 	 * position of the drawn picture is (so there is no need to
67 	 * check for odd height).
68 	 */
69 
70 	finfo = drm_format_info(new_plane_state->fb->format->format);
71 
72 	if ((new_plane_state->src_x >> 16) % finfo->hsub != 0) {
73 		dev_dbg(ddev->dev,
74 			"%s: x-position %u not divisible subpixel size %u\n",
75 			__func__, (new_plane_state->src_x >> 16), finfo->hsub);
76 		return -EINVAL;
77 	}
78 
79 	if ((new_plane_state->src_y >> 16) % finfo->vsub != 0) {
80 		dev_dbg(ddev->dev,
81 			"%s: y-position %u not divisible subpixel size %u\n",
82 			__func__, (new_plane_state->src_y >> 16), finfo->vsub);
83 		return -EINVAL;
84 	}
85 
86 	if ((new_plane_state->src_w >> 16) % finfo->hsub != 0) {
87 		dev_dbg(ddev->dev,
88 			"%s: src width %u not divisible by subpixel size %u\n",
89 			 __func__, (new_plane_state->src_w >> 16),
90 			 finfo->hsub);
91 		return -EINVAL;
92 	}
93 
94 	if (!new_plane_state->visible)
95 		return 0;
96 
97 	hw_videoport = to_tidss_crtc(new_plane_state->crtc)->hw_videoport;
98 
99 	ret = dispc_plane_check(tidss->dispc, hw_plane, new_plane_state,
100 				hw_videoport);
101 	if (ret)
102 		return ret;
103 
104 	return 0;
105 }
106 
107 static void tidss_plane_atomic_update(struct drm_plane *plane,
108 				      struct drm_atomic_state *state)
109 {
110 	struct drm_device *ddev = plane->dev;
111 	struct tidss_device *tidss = to_tidss(ddev);
112 	struct tidss_plane *tplane = to_tidss_plane(plane);
113 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
114 									   plane);
115 	u32 hw_videoport;
116 	int ret;
117 
118 	dev_dbg(ddev->dev, "%s\n", __func__);
119 
120 	if (!new_state->visible) {
121 		dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, false);
122 		return;
123 	}
124 
125 	hw_videoport = to_tidss_crtc(new_state->crtc)->hw_videoport;
126 
127 	ret = dispc_plane_setup(tidss->dispc, tplane->hw_plane_id,
128 				new_state, hw_videoport);
129 
130 	if (ret) {
131 		dev_err(plane->dev->dev, "%s: Failed to setup plane %d\n",
132 			__func__, tplane->hw_plane_id);
133 		dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, false);
134 		return;
135 	}
136 
137 	dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, true);
138 }
139 
140 static void tidss_plane_atomic_disable(struct drm_plane *plane,
141 				       struct drm_atomic_state *state)
142 {
143 	struct drm_device *ddev = plane->dev;
144 	struct tidss_device *tidss = to_tidss(ddev);
145 	struct tidss_plane *tplane = to_tidss_plane(plane);
146 
147 	dev_dbg(ddev->dev, "%s\n", __func__);
148 
149 	dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, false);
150 }
151 
152 static void drm_plane_destroy(struct drm_plane *plane)
153 {
154 	struct tidss_plane *tplane = to_tidss_plane(plane);
155 
156 	drm_plane_cleanup(plane);
157 	kfree(tplane);
158 }
159 
160 static const struct drm_plane_helper_funcs tidss_plane_helper_funcs = {
161 	.prepare_fb = drm_gem_plane_helper_prepare_fb,
162 	.atomic_check = tidss_plane_atomic_check,
163 	.atomic_update = tidss_plane_atomic_update,
164 	.atomic_disable = tidss_plane_atomic_disable,
165 };
166 
167 static const struct drm_plane_funcs tidss_plane_funcs = {
168 	.update_plane = drm_atomic_helper_update_plane,
169 	.disable_plane = drm_atomic_helper_disable_plane,
170 	.reset = drm_atomic_helper_plane_reset,
171 	.destroy = drm_plane_destroy,
172 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
173 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
174 };
175 
176 struct tidss_plane *tidss_plane_create(struct tidss_device *tidss,
177 				       u32 hw_plane_id, u32 plane_type,
178 				       u32 crtc_mask, const u32 *formats,
179 				       u32 num_formats)
180 {
181 	struct tidss_plane *tplane;
182 	enum drm_plane_type type;
183 	u32 possible_crtcs;
184 	u32 num_planes = tidss->feat->num_planes;
185 	u32 color_encodings = (BIT(DRM_COLOR_YCBCR_BT601) |
186 			       BIT(DRM_COLOR_YCBCR_BT709));
187 	u32 color_ranges = (BIT(DRM_COLOR_YCBCR_FULL_RANGE) |
188 			    BIT(DRM_COLOR_YCBCR_LIMITED_RANGE));
189 	u32 default_encoding = DRM_COLOR_YCBCR_BT601;
190 	u32 default_range = DRM_COLOR_YCBCR_FULL_RANGE;
191 	u32 blend_modes = (BIT(DRM_MODE_BLEND_PREMULTI) |
192 			   BIT(DRM_MODE_BLEND_COVERAGE));
193 	int ret;
194 
195 	tplane = kzalloc(sizeof(*tplane), GFP_KERNEL);
196 	if (!tplane)
197 		return ERR_PTR(-ENOMEM);
198 
199 	tplane->hw_plane_id = hw_plane_id;
200 
201 	possible_crtcs = crtc_mask;
202 	type = plane_type;
203 
204 	ret = drm_universal_plane_init(&tidss->ddev, &tplane->plane,
205 				       possible_crtcs,
206 				       &tidss_plane_funcs,
207 				       formats, num_formats,
208 				       NULL, type, NULL);
209 	if (ret < 0)
210 		goto err;
211 
212 	drm_plane_helper_add(&tplane->plane, &tidss_plane_helper_funcs);
213 
214 	drm_plane_create_zpos_property(&tplane->plane, hw_plane_id, 0,
215 				       num_planes - 1);
216 
217 	ret = drm_plane_create_color_properties(&tplane->plane,
218 						color_encodings,
219 						color_ranges,
220 						default_encoding,
221 						default_range);
222 	if (ret)
223 		goto err;
224 
225 	ret = drm_plane_create_alpha_property(&tplane->plane);
226 	if (ret)
227 		goto err;
228 
229 	ret = drm_plane_create_blend_mode_property(&tplane->plane, blend_modes);
230 	if (ret)
231 		goto err;
232 
233 	return tplane;
234 
235 err:
236 	kfree(tplane);
237 	return ERR_PTR(ret);
238 }
239