1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021 MediaTek Inc.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/soc/mediatek/mtk-cmdq.h>
#include "mtk_disp_drv.h"
#include "mtk_drm_crtc.h"
#include "mtk_drm_ddp_comp.h"
#include "mtk_drm_drv.h"
#define DISP_GAMMA_EN 0x0000
#define GAMMA_EN BIT(0)
#define DISP_GAMMA_CFG 0x0020
#define GAMMA_LUT_EN BIT(1)
#define GAMMA_DITHERING BIT(2)
#define DISP_GAMMA_SIZE 0x0030
#define DISP_GAMMA_LUT 0x0700
#define LUT_10BIT_MASK 0x03ff
struct mtk_disp_gamma_data {
bool has_dither;
bool lut_diff;
};
/*
* struct mtk_disp_gamma - DISP_GAMMA driver structure
*/
struct mtk_disp_gamma {
struct clk *clk;
void __iomem *regs;
struct cmdq_client_reg cmdq_reg;
const struct mtk_disp_gamma_data *data;
};
int mtk_gamma_clk_enable(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
return clk_prepare_enable(gamma->clk);
}
void mtk_gamma_clk_disable(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
clk_disable_unprepare(gamma->clk);
}
void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state, bool lut_diff)
{
unsigned int i, reg;
struct drm_color_lut *lut;
void __iomem *lut_base;
u32 word;
u32 diff[3] = {0};
if (state->gamma_lut) {
reg = readl(regs + DISP_GAMMA_CFG);
reg = reg | GAMMA_LUT_EN;
writel(reg, regs + DISP_GAMMA_CFG);
lut_base = regs + DISP_GAMMA_LUT;
lut = (struct drm_color_lut *)state->gamma_lut->data;
for (i = 0; i < MTK_LUT_SIZE; i++) {
if (!lut_diff || (i % 2 == 0)) {
word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) +
(((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) +
((lut[i].blue >> 6) & LUT_10BIT_MASK);
} else {
diff[0] = (lut[i].red >> 6) - (lut[i - 1].red >> 6);
diff[1] = (lut[i].green >> 6) - (lut[i - 1].green >> 6);
diff[2] = (lut[i].blue >> 6) - (lut[i - 1].blue >> 6);
word = ((diff[0] & LUT_10BIT_MASK) << 20) +
((diff[1] & LUT_10BIT_MASK) << 10) +
(diff[2] & LUT_10BIT_MASK);
}
writel(word, (lut_base + i * 4));
}
}
}
void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
bool lut_diff = false;
if (gamma->data)
lut_diff = gamma->data->lut_diff;
mtk_gamma_set_common(gamma->regs, state, lut_diff);
}
void mtk_gamma_config(struct device *dev, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
mtk_ddp_write(cmdq_pkt, h << 16 | w, &gamma->cmdq_reg, gamma->regs,
DISP_GAMMA_SIZE);
if (gamma->data && gamma->data->has_dither)
mtk_dither_set_common(gamma->regs, &gamma->cmdq_reg, bpc,
DISP_GAMMA_CFG, GAMMA_DITHERING, cmdq_pkt);
}
void mtk_gamma_start(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
writel(GAMMA_EN, gamma->regs + DISP_GAMMA_EN);
}
void mtk_gamma_stop(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
writel_relaxed(0x0, gamma->regs + DISP_GAMMA_EN);
}
static int mtk_disp_gamma_bind(struct device *dev, struct device *master,
void *data)
{
return 0;
}
static void mtk_disp_gamma_unbind(struct device *dev, struct device *master,
void *data)
{
}
static const struct component_ops mtk_disp_gamma_component_ops = {
.bind = mtk_disp_gamma_bind,
.unbind = mtk_disp_gamma_unbind,
};
static int mtk_disp_gamma_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_disp_gamma *priv;
struct resource *res;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "failed to get gamma clk\n");
return PTR_ERR(priv->clk);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->regs)) {
dev_err(dev, "failed to ioremap gamma\n");
return PTR_ERR(priv->regs);
}
#if IS_REACHABLE(CONFIG_MTK_CMDQ)
ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
if (ret)
dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
#endif
priv->data = of_device_get_match_data(dev);
platform_set_drvdata(pdev, priv);
ret = component_add(dev, &mtk_disp_gamma_component_ops);
if (ret)
dev_err(dev, "Failed to add component: %d\n", ret);
return ret;
}
static int mtk_disp_gamma_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &mtk_disp_gamma_component_ops);
return 0;
}
static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = {
.has_dither = true,
};
static const struct mtk_disp_gamma_data mt8183_gamma_driver_data = {
.lut_diff = true,
};
static const struct of_device_id mtk_disp_gamma_driver_dt_match[] = {
{ .compatible = "mediatek,mt8173-disp-gamma",
.data = &mt8173_gamma_driver_data},
{ .compatible = "mediatek,mt8183-disp-gamma",
.data = &mt8183_gamma_driver_data},
{},
};
MODULE_DEVICE_TABLE(of, mtk_disp_gamma_driver_dt_match);
struct platform_driver mtk_disp_gamma_driver = {
.probe = mtk_disp_gamma_probe,
.remove = mtk_disp_gamma_remove,
.driver = {
.name = "mediatek-disp-gamma",
.owner = THIS_MODULE,
.of_match_table = mtk_disp_gamma_driver_dt_match,
},
};
|
