1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2015 Freescale Semiconductor, Inc.
4 *
5 * Freescale DCU drm device driver
6 */
7
8 #include <linux/clk.h>
9 #include <linux/regmap.h>
10
11 #include <video/videomode.h>
12
13 #include <drm/drm_atomic.h>
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_crtc.h>
16 #include <drm/drm_probe_helper.h>
17 #include <drm/drm_vblank.h>
18
19 #include "fsl_dcu_drm_crtc.h"
20 #include "fsl_dcu_drm_drv.h"
21 #include "fsl_dcu_drm_plane.h"
22
fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc * crtc,struct drm_atomic_state * state)23 static void fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc *crtc,
24 struct drm_atomic_state *state)
25 {
26 struct drm_device *dev = crtc->dev;
27 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
28 struct drm_pending_vblank_event *event = crtc->state->event;
29
30 regmap_write(fsl_dev->regmap,
31 DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
32
33 if (event) {
34 crtc->state->event = NULL;
35
36 spin_lock_irq(&crtc->dev->event_lock);
37 if (drm_crtc_vblank_get(crtc) == 0)
38 drm_crtc_arm_vblank_event(crtc, event);
39 else
40 drm_crtc_send_vblank_event(crtc, event);
41 spin_unlock_irq(&crtc->dev->event_lock);
42 }
43 }
44
fsl_dcu_drm_crtc_atomic_disable(struct drm_crtc * crtc,struct drm_atomic_state * state)45 static void fsl_dcu_drm_crtc_atomic_disable(struct drm_crtc *crtc,
46 struct drm_atomic_state *state)
47 {
48 struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
49 crtc);
50 struct drm_device *dev = crtc->dev;
51 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
52
53 /* always disable planes on the CRTC */
54 drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);
55
56 drm_crtc_vblank_off(crtc);
57
58 regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
59 DCU_MODE_DCU_MODE_MASK,
60 DCU_MODE_DCU_MODE(DCU_MODE_OFF));
61 regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
62 DCU_UPDATE_MODE_READREG);
63 clk_disable_unprepare(fsl_dev->pix_clk);
64 }
65
fsl_dcu_drm_crtc_atomic_enable(struct drm_crtc * crtc,struct drm_atomic_state * state)66 static void fsl_dcu_drm_crtc_atomic_enable(struct drm_crtc *crtc,
67 struct drm_atomic_state *state)
68 {
69 struct drm_device *dev = crtc->dev;
70 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
71
72 clk_prepare_enable(fsl_dev->pix_clk);
73 regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
74 DCU_MODE_DCU_MODE_MASK,
75 DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
76 regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
77 DCU_UPDATE_MODE_READREG);
78
79 drm_crtc_vblank_on(crtc);
80 }
81
fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc * crtc)82 static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
83 {
84 struct drm_device *dev = crtc->dev;
85 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
86 struct drm_connector *con = &fsl_dev->connector.base;
87 struct drm_display_mode *mode = &crtc->state->mode;
88 unsigned int pol = 0;
89 struct videomode vm;
90
91 clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
92
93 drm_display_mode_to_videomode(mode, &vm);
94
95 /* INV_PXCK as default (most display sample data on rising edge) */
96 if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE))
97 pol |= DCU_SYN_POL_INV_PXCK;
98
99 if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
100 pol |= DCU_SYN_POL_INV_HS_LOW;
101
102 if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
103 pol |= DCU_SYN_POL_INV_VS_LOW;
104
105 regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
106 DCU_HSYN_PARA_BP(vm.hback_porch) |
107 DCU_HSYN_PARA_PW(vm.hsync_len) |
108 DCU_HSYN_PARA_FP(vm.hfront_porch));
109 regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
110 DCU_VSYN_PARA_BP(vm.vback_porch) |
111 DCU_VSYN_PARA_PW(vm.vsync_len) |
112 DCU_VSYN_PARA_FP(vm.vfront_porch));
113 regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
114 DCU_DISP_SIZE_DELTA_Y(vm.vactive) |
115 DCU_DISP_SIZE_DELTA_X(vm.hactive));
116 regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
117 regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
118 DCU_BGND_G(0) | DCU_BGND_B(0));
119 regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
120 DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
121 regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
122 DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
123 DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
124 DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
125 return;
126 }
127
128 static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
129 .atomic_disable = fsl_dcu_drm_crtc_atomic_disable,
130 .atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
131 .atomic_enable = fsl_dcu_drm_crtc_atomic_enable,
132 .mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
133 };
134
fsl_dcu_drm_crtc_enable_vblank(struct drm_crtc * crtc)135 static int fsl_dcu_drm_crtc_enable_vblank(struct drm_crtc *crtc)
136 {
137 struct drm_device *dev = crtc->dev;
138 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
139 unsigned int value;
140
141 regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
142 value &= ~DCU_INT_MASK_VBLANK;
143 regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
144
145 return 0;
146 }
147
fsl_dcu_drm_crtc_disable_vblank(struct drm_crtc * crtc)148 static void fsl_dcu_drm_crtc_disable_vblank(struct drm_crtc *crtc)
149 {
150 struct drm_device *dev = crtc->dev;
151 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
152 unsigned int value;
153
154 regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
155 value |= DCU_INT_MASK_VBLANK;
156 regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
157 }
158
159 static const struct drm_crtc_funcs fsl_dcu_drm_crtc_funcs = {
160 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
161 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
162 .destroy = drm_crtc_cleanup,
163 .page_flip = drm_atomic_helper_page_flip,
164 .reset = drm_atomic_helper_crtc_reset,
165 .set_config = drm_atomic_helper_set_config,
166 .enable_vblank = fsl_dcu_drm_crtc_enable_vblank,
167 .disable_vblank = fsl_dcu_drm_crtc_disable_vblank,
168 };
169
fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device * fsl_dev)170 int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
171 {
172 struct drm_plane *primary;
173 struct drm_crtc *crtc = &fsl_dev->crtc;
174 int ret;
175
176 fsl_dcu_drm_init_planes(fsl_dev->drm);
177
178 primary = fsl_dcu_drm_primary_create_plane(fsl_dev->drm);
179 if (!primary)
180 return -ENOMEM;
181
182 ret = drm_crtc_init_with_planes(fsl_dev->drm, crtc, primary, NULL,
183 &fsl_dcu_drm_crtc_funcs, NULL);
184 if (ret) {
185 primary->funcs->destroy(primary);
186 return ret;
187 }
188
189 drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
190
191 return 0;
192 }
193