xref: /linux/drivers/gpu/drm/mediatek/mtk_disp_aal.c (revision e70140ba0d2b1a30467d4af6bcfe761327b9ec95)
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 
35 struct 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   */
46 struct 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 
mtk_aal_clk_enable(struct device * dev)53 int mtk_aal_clk_enable(struct device *dev)
54 {
55 	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
56 
57 	return clk_prepare_enable(aal->clk);
58 }
59 
mtk_aal_clk_disable(struct device * dev)60 void mtk_aal_clk_disable(struct device *dev)
61 {
62 	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
63 
64 	clk_disable_unprepare(aal->clk);
65 }
66 
mtk_aal_config(struct device * dev,unsigned int w,unsigned int h,unsigned int vrefresh,unsigned int bpc,struct cmdq_pkt * cmdq_pkt)67 void 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, sz, &aal->cmdq_reg, aal->regs, DISP_AAL_SIZE);
78 	mtk_ddp_write(cmdq_pkt, sz, &aal->cmdq_reg, 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  */
mtk_aal_gamma_get_lut_size(struct device * dev)87 unsigned 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 
mtk_aal_gamma_set(struct device * dev,struct drm_crtc_state * state)96 void 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(lut[i].red, DISP_AAL_LUT_BITS),
115 			.green = drm_color_lut_extract(lut[i].green, DISP_AAL_LUT_BITS),
116 			.blue = drm_color_lut_extract(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(word, aal->regs + DISP_AAL_GAMMA_LUT + i * 4);
124 	}
125 
126 	cfg_val = readl(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(cfg_val, aal->regs + DISP_AAL_CFG);
135 }
136 
mtk_aal_start(struct device * dev)137 void mtk_aal_start(struct device *dev)
138 {
139 	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
140 
141 	writel(AAL_EN, aal->regs + DISP_AAL_EN);
142 }
143 
mtk_aal_stop(struct device * dev)144 void 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 
mtk_disp_aal_bind(struct device * dev,struct device * master,void * data)151 static int mtk_disp_aal_bind(struct device *dev, struct device *master,
152 			       void *data)
153 {
154 	return 0;
155 }
156 
mtk_disp_aal_unbind(struct device * dev,struct device * master,void * data)157 static void mtk_disp_aal_unbind(struct device *dev, struct device *master,
158 				  void *data)
159 {
160 }
161 
162 static const struct component_ops mtk_disp_aal_component_ops = {
163 	.bind	= mtk_disp_aal_bind,
164 	.unbind = mtk_disp_aal_unbind,
165 };
166 
mtk_disp_aal_probe(struct platform_device * pdev)167 static 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, sizeof(*priv), GFP_KERNEL);
174 	if (!priv)
175 		return -ENOMEM;
176 
177 	priv->clk = devm_clk_get(dev, NULL);
178 	if (IS_ERR(priv->clk))
179 		return dev_err_probe(dev, PTR_ERR(priv->clk),
180 				     "failed to get aal clk\n");
181 
182 	priv->regs = devm_platform_ioremap_resource(pdev, 0);
183 	if (IS_ERR(priv->regs))
184 		return dev_err_probe(dev, PTR_ERR(priv->regs),
185 				     "failed to ioremap aal\n");
186 
187 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
188 	ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 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, priv);
195 
196 	ret = component_add(dev, &mtk_disp_aal_component_ops);
197 	if (ret)
198 		return dev_err_probe(dev, ret, "Failed to add component\n");
199 
200 	return 0;
201 }
202 
mtk_disp_aal_remove(struct platform_device * pdev)203 static void mtk_disp_aal_remove(struct platform_device *pdev)
204 {
205 	component_del(&pdev->dev, &mtk_disp_aal_component_ops);
206 }
207 
208 static const struct mtk_disp_aal_data mt8173_aal_driver_data = {
209 	.has_gamma = true,
210 };
211 
212 static 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 };
217 MODULE_DEVICE_TABLE(of, mtk_disp_aal_driver_dt_match);
218 
219 struct 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