1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * shmob_drm_kms.c -- SH Mobile DRM Mode Setting
4 *
5 * Copyright (C) 2012 Renesas Electronics Corporation
6 *
7 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8 */
9
10 #include <drm/drm_crtc.h>
11 #include <drm/drm_crtc_helper.h>
12 #include <drm/drm_fourcc.h>
13 #include <drm/drm_gem_dma_helper.h>
14 #include <drm/drm_gem_framebuffer_helper.h>
15 #include <drm/drm_probe_helper.h>
16
17 #include "shmob_drm_crtc.h"
18 #include "shmob_drm_drv.h"
19 #include "shmob_drm_kms.h"
20 #include "shmob_drm_regs.h"
21
22 /* -----------------------------------------------------------------------------
23 * Format helpers
24 */
25
26 static const struct shmob_drm_format_info shmob_drm_format_infos[] = {
27 {
28 .fourcc = DRM_FORMAT_RGB565,
29 .bpp = 16,
30 .yuv = false,
31 .lddfr = LDDFR_PKF_RGB16,
32 }, {
33 .fourcc = DRM_FORMAT_RGB888,
34 .bpp = 24,
35 .yuv = false,
36 .lddfr = LDDFR_PKF_RGB24,
37 }, {
38 .fourcc = DRM_FORMAT_ARGB8888,
39 .bpp = 32,
40 .yuv = false,
41 .lddfr = LDDFR_PKF_ARGB32,
42 }, {
43 .fourcc = DRM_FORMAT_NV12,
44 .bpp = 12,
45 .yuv = true,
46 .lddfr = LDDFR_CC | LDDFR_YF_420,
47 }, {
48 .fourcc = DRM_FORMAT_NV21,
49 .bpp = 12,
50 .yuv = true,
51 .lddfr = LDDFR_CC | LDDFR_YF_420,
52 }, {
53 .fourcc = DRM_FORMAT_NV16,
54 .bpp = 16,
55 .yuv = true,
56 .lddfr = LDDFR_CC | LDDFR_YF_422,
57 }, {
58 .fourcc = DRM_FORMAT_NV61,
59 .bpp = 16,
60 .yuv = true,
61 .lddfr = LDDFR_CC | LDDFR_YF_422,
62 }, {
63 .fourcc = DRM_FORMAT_NV24,
64 .bpp = 24,
65 .yuv = true,
66 .lddfr = LDDFR_CC | LDDFR_YF_444,
67 }, {
68 .fourcc = DRM_FORMAT_NV42,
69 .bpp = 24,
70 .yuv = true,
71 .lddfr = LDDFR_CC | LDDFR_YF_444,
72 },
73 };
74
shmob_drm_format_info(u32 fourcc)75 const struct shmob_drm_format_info *shmob_drm_format_info(u32 fourcc)
76 {
77 unsigned int i;
78
79 for (i = 0; i < ARRAY_SIZE(shmob_drm_format_infos); ++i) {
80 if (shmob_drm_format_infos[i].fourcc == fourcc)
81 return &shmob_drm_format_infos[i];
82 }
83
84 return NULL;
85 }
86
87 /* -----------------------------------------------------------------------------
88 * Frame buffer
89 */
90
91 static struct drm_framebuffer *
shmob_drm_fb_create(struct drm_device * dev,struct drm_file * file_priv,const struct drm_mode_fb_cmd2 * mode_cmd)92 shmob_drm_fb_create(struct drm_device *dev, struct drm_file *file_priv,
93 const struct drm_mode_fb_cmd2 *mode_cmd)
94 {
95 const struct shmob_drm_format_info *format;
96
97 format = shmob_drm_format_info(mode_cmd->pixel_format);
98 if (format == NULL) {
99 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
100 mode_cmd->pixel_format);
101 return ERR_PTR(-EINVAL);
102 }
103
104 if (mode_cmd->pitches[0] & 7 || mode_cmd->pitches[0] >= 65536) {
105 dev_dbg(dev->dev, "invalid pitch value %u\n",
106 mode_cmd->pitches[0]);
107 return ERR_PTR(-EINVAL);
108 }
109
110 if (format->yuv) {
111 unsigned int chroma_cpp = format->bpp == 24 ? 2 : 1;
112
113 if (mode_cmd->pitches[1] != mode_cmd->pitches[0] * chroma_cpp) {
114 dev_dbg(dev->dev,
115 "luma and chroma pitches do not match\n");
116 return ERR_PTR(-EINVAL);
117 }
118 }
119
120 return drm_gem_fb_create(dev, file_priv, mode_cmd);
121 }
122
123 static const struct drm_mode_config_funcs shmob_drm_mode_config_funcs = {
124 .fb_create = shmob_drm_fb_create,
125 };
126
shmob_drm_modeset_init(struct shmob_drm_device * sdev)127 int shmob_drm_modeset_init(struct shmob_drm_device *sdev)
128 {
129 int ret;
130
131 ret = drmm_mode_config_init(sdev->ddev);
132 if (ret)
133 return ret;
134
135 shmob_drm_crtc_create(sdev);
136 shmob_drm_encoder_create(sdev);
137 shmob_drm_connector_create(sdev, &sdev->encoder.encoder);
138
139 drm_kms_helper_poll_init(sdev->ddev);
140
141 sdev->ddev->mode_config.min_width = 0;
142 sdev->ddev->mode_config.min_height = 0;
143 sdev->ddev->mode_config.max_width = 4095;
144 sdev->ddev->mode_config.max_height = 4095;
145 sdev->ddev->mode_config.funcs = &shmob_drm_mode_config_funcs;
146
147 drm_helper_disable_unused_functions(sdev->ddev);
148
149 return 0;
150 }
151