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_disp_drv.h"
 15#include "mtk_drm_crtc.h"
 16#include "mtk_drm_ddp_comp.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(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(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, 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 */
 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(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
137void 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
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, 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		dev_err(dev, "failed to get aal clk\n");
180		return PTR_ERR(priv->clk);
181	}
182
183	priv->regs = devm_platform_ioremap_resource(pdev, 0);
184	if (IS_ERR(priv->regs)) {
185		dev_err(dev, "failed to ioremap aal\n");
186		return PTR_ERR(priv->regs);
187	}
188
189#if IS_REACHABLE(CONFIG_MTK_CMDQ)
190	ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
191	if (ret)
192		dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
193#endif
194
195	priv->data = of_device_get_match_data(dev);
196	platform_set_drvdata(pdev, priv);
197
198	ret = component_add(dev, &mtk_disp_aal_component_ops);
199	if (ret)
200		dev_err(dev, "Failed to add component: %d\n", ret);
201
202	return ret;
203}
204
205static void mtk_disp_aal_remove(struct platform_device *pdev)
206{
207	component_del(&pdev->dev, &mtk_disp_aal_component_ops);
208}
209
210static const struct mtk_disp_aal_data mt8173_aal_driver_data = {
211	.has_gamma = true,
212};
213
214static const struct of_device_id mtk_disp_aal_driver_dt_match[] = {
215	{ .compatible = "mediatek,mt8173-disp-aal", .data = &mt8173_aal_driver_data },
216	{ .compatible = "mediatek,mt8183-disp-aal" },
217	{ /* sentinel */ }
218};
219MODULE_DEVICE_TABLE(of, mtk_disp_aal_driver_dt_match);
220
221struct platform_driver mtk_disp_aal_driver = {
222	.probe		= mtk_disp_aal_probe,
223	.remove_new	= mtk_disp_aal_remove,
224	.driver		= {
225		.name	= "mediatek-disp-aal",
226		.owner	= THIS_MODULE,
227		.of_match_table = mtk_disp_aal_driver_dt_match,
228	},
229};