1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2021 MediaTek Inc.
4 */
5
6#include <linux/bitfield.h>
7#include <linux/clk.h>
8#include <linux/component.h>
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/soc/mediatek/mtk-cmdq.h>
13
14#include "mtk_crtc.h"
15#include "mtk_ddp_comp.h"
16#include "mtk_disp_drv.h"
17#include "mtk_drm_drv.h"
18
19#define DISP_AAL_EN 0x0000
20#define AAL_EN BIT(0)
21#define DISP_AAL_CFG 0x0020
22#define AAL_RELAY_MODE BIT(0)
23#define AAL_GAMMA_LUT_EN BIT(1)
24#define DISP_AAL_SIZE 0x0030
25#define DISP_AAL_SIZE_HSIZE GENMASK(28, 16)
26#define DISP_AAL_SIZE_VSIZE GENMASK(12, 0)
27#define DISP_AAL_OUTPUT_SIZE 0x04d8
28#define DISP_AAL_GAMMA_LUT 0x0700
29#define DISP_AAL_GAMMA_LUT_R GENMASK(29, 20)
30#define DISP_AAL_GAMMA_LUT_G GENMASK(19, 10)
31#define DISP_AAL_GAMMA_LUT_B GENMASK(9, 0)
32#define DISP_AAL_LUT_BITS 10
33#define DISP_AAL_LUT_SIZE 512
34
35struct mtk_disp_aal_data {
36 bool has_gamma;
37};
38
39 /**
40 * struct mtk_disp_aal - Display Adaptive Ambient Light driver structure
41 * @clk: clock for DISP_AAL controller
42 * @regs: MMIO registers base
43 * @cmdq_reg: CMDQ Client register
44 * @data: platform specific data for DISP_AAL
45 */
46struct mtk_disp_aal {
47 struct clk *clk;
48 void __iomem *regs;
49 struct cmdq_client_reg cmdq_reg;
50 const struct mtk_disp_aal_data *data;
51};
52
53int mtk_aal_clk_enable(struct device *dev)
54{
55 struct mtk_disp_aal *aal = dev_get_drvdata(dev);
56
57 return clk_prepare_enable(clk: aal->clk);
58}
59
60void mtk_aal_clk_disable(struct device *dev)
61{
62 struct mtk_disp_aal *aal = dev_get_drvdata(dev);
63
64 clk_disable_unprepare(clk: aal->clk);
65}
66
67void mtk_aal_config(struct device *dev, unsigned int w,
68 unsigned int h, unsigned int vrefresh,
69 unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
70{
71 struct mtk_disp_aal *aal = dev_get_drvdata(dev);
72 u32 sz;
73
74 sz = FIELD_PREP(DISP_AAL_SIZE_HSIZE, w);
75 sz |= FIELD_PREP(DISP_AAL_SIZE_VSIZE, h);
76
77 mtk_ddp_write(cmdq_pkt, value: sz, cmdq_reg: &aal->cmdq_reg, regs: aal->regs, DISP_AAL_SIZE);
78 mtk_ddp_write(cmdq_pkt, value: sz, cmdq_reg: &aal->cmdq_reg, regs: aal->regs, DISP_AAL_OUTPUT_SIZE);
79}
80
81/**
82 * mtk_aal_gamma_get_lut_size() - Get gamma LUT size for AAL
83 * @dev: Pointer to struct device
84 *
85 * Return: 0 if gamma control not supported in AAL or gamma LUT size
86 */
87unsigned int mtk_aal_gamma_get_lut_size(struct device *dev)
88{
89 struct mtk_disp_aal *aal = dev_get_drvdata(dev);
90
91 if (aal->data && aal->data->has_gamma)
92 return DISP_AAL_LUT_SIZE;
93 return 0;
94}
95
96void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
97{
98 struct mtk_disp_aal *aal = dev_get_drvdata(dev);
99 struct drm_color_lut *lut;
100 unsigned int i;
101 u32 cfg_val;
102
103 /* If gamma is not supported in AAL, go out immediately */
104 if (!(aal->data && aal->data->has_gamma))
105 return;
106
107 /* Also, if there's no gamma lut there's nothing to do here. */
108 if (!state->gamma_lut)
109 return;
110
111 lut = (struct drm_color_lut *)state->gamma_lut->data;
112 for (i = 0; i < DISP_AAL_LUT_SIZE; i++) {
113 struct drm_color_lut hwlut = {
114 .red = drm_color_lut_extract(user_input: lut[i].red, DISP_AAL_LUT_BITS),
115 .green = drm_color_lut_extract(user_input: lut[i].green, DISP_AAL_LUT_BITS),
116 .blue = drm_color_lut_extract(user_input: lut[i].blue, DISP_AAL_LUT_BITS)
117 };
118 u32 word;
119
120 word = FIELD_PREP(DISP_AAL_GAMMA_LUT_R, hwlut.red);
121 word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_G, hwlut.green);
122 word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_B, hwlut.blue);
123 writel(val: word, addr: aal->regs + DISP_AAL_GAMMA_LUT + i * 4);
124 }
125
126 cfg_val = readl(addr: aal->regs + DISP_AAL_CFG);
127
128 /* Enable the gamma table */
129 cfg_val |= FIELD_PREP(AAL_GAMMA_LUT_EN, 1);
130
131 /* Disable RELAY mode to pass the processed image */
132 cfg_val &= ~AAL_RELAY_MODE;
133
134 writel(val: cfg_val, addr: aal->regs + DISP_AAL_CFG);
135}
136
137void mtk_aal_start(struct device *dev)
138{
139 struct mtk_disp_aal *aal = dev_get_drvdata(dev);
140
141 writel(AAL_EN, addr: aal->regs + DISP_AAL_EN);
142}
143
144void mtk_aal_stop(struct device *dev)
145{
146 struct mtk_disp_aal *aal = dev_get_drvdata(dev);
147
148 writel_relaxed(0x0, aal->regs + DISP_AAL_EN);
149}
150
151static int mtk_disp_aal_bind(struct device *dev, struct device *master,
152 void *data)
153{
154 return 0;
155}
156
157static void mtk_disp_aal_unbind(struct device *dev, struct device *master,
158 void *data)
159{
160}
161
162static const struct component_ops mtk_disp_aal_component_ops = {
163 .bind = mtk_disp_aal_bind,
164 .unbind = mtk_disp_aal_unbind,
165};
166
167static int mtk_disp_aal_probe(struct platform_device *pdev)
168{
169 struct device *dev = &pdev->dev;
170 struct mtk_disp_aal *priv;
171 int ret;
172
173 priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL);
174 if (!priv)
175 return -ENOMEM;
176
177 priv->clk = devm_clk_get(dev, NULL);
178 if (IS_ERR(ptr: priv->clk))
179 return dev_err_probe(dev, err: PTR_ERR(ptr: priv->clk),
180 fmt: "failed to get aal clk\n");
181
182 priv->regs = devm_platform_ioremap_resource(pdev, index: 0);
183 if (IS_ERR(ptr: priv->regs))
184 return dev_err_probe(dev, err: PTR_ERR(ptr: priv->regs),
185 fmt: "failed to ioremap aal\n");
186
187#if IS_REACHABLE(CONFIG_MTK_CMDQ)
188 ret = cmdq_dev_get_client_reg(dev, client_reg: &priv->cmdq_reg, idx: 0);
189 if (ret)
190 dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
191#endif
192
193 priv->data = of_device_get_match_data(dev);
194 platform_set_drvdata(pdev, data: priv);
195
196 ret = component_add(dev, &mtk_disp_aal_component_ops);
197 if (ret)
198 return dev_err_probe(dev, err: ret, fmt: "Failed to add component\n");
199
200 return 0;
201}
202
203static void mtk_disp_aal_remove(struct platform_device *pdev)
204{
205 component_del(&pdev->dev, &mtk_disp_aal_component_ops);
206}
207
208static const struct mtk_disp_aal_data mt8173_aal_driver_data = {
209 .has_gamma = true,
210};
211
212static const struct of_device_id mtk_disp_aal_driver_dt_match[] = {
213 { .compatible = "mediatek,mt8173-disp-aal", .data = &mt8173_aal_driver_data },
214 { .compatible = "mediatek,mt8183-disp-aal" },
215 { /* sentinel */ }
216};
217MODULE_DEVICE_TABLE(of, mtk_disp_aal_driver_dt_match);
218
219struct platform_driver mtk_disp_aal_driver = {
220 .probe = mtk_disp_aal_probe,
221 .remove = mtk_disp_aal_remove,
222 .driver = {
223 .name = "mediatek-disp-aal",
224 .of_match_table = mtk_disp_aal_driver_dt_match,
225 },
226};
227

source code of linux/drivers/gpu/drm/mediatek/mtk_disp_aal.c