1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2016, The Linux Foundation. All rights reserved.
  4 */
  5
  6#include <linux/of_graph.h>
  7
  8#include "adv7511.h"
  9
 10static const struct reg_sequence adv7533_fixed_registers[] = {
 11	{ 0x16, 0x20 },
 12	{ 0x9a, 0xe0 },
 13	{ 0xba, 0x70 },
 14	{ 0xde, 0x82 },
 15	{ 0xe4, 0x40 },
 16	{ 0xe5, 0x80 },
 17};
 18
 19static const struct reg_sequence adv7533_cec_fixed_registers[] = {
 20	{ 0x15, 0xd0 },
 21	{ 0x17, 0xd0 },
 22	{ 0x24, 0x20 },
 23	{ 0x57, 0x11 },
 24	{ 0x05, 0xc8 },
 25};
 26
 27static void adv7511_dsi_config_timing_gen(struct adv7511 *adv)
 28{
 29	struct mipi_dsi_device *dsi = adv->dsi;
 30	struct drm_display_mode *mode = &adv->curr_mode;
 31	unsigned int hsw, hfp, hbp, vsw, vfp, vbp;
 32	static const u8 clock_div_by_lanes[] = { 6, 4, 3 };	/* 2, 3, 4 lanes */
 33
 34	hsw = mode->hsync_end - mode->hsync_start;
 35	hfp = mode->hsync_start - mode->hdisplay;
 36	hbp = mode->htotal - mode->hsync_end;
 37	vsw = mode->vsync_end - mode->vsync_start;
 38	vfp = mode->vsync_start - mode->vdisplay;
 39	vbp = mode->vtotal - mode->vsync_end;
 40
 41	/* set pixel clock divider mode */
 42	regmap_write(adv->regmap_cec, 0x16,
 43		     clock_div_by_lanes[dsi->lanes - 2] << 3);
 44
 45	/* horizontal porch params */
 46	regmap_write(adv->regmap_cec, 0x28, mode->htotal >> 4);
 47	regmap_write(adv->regmap_cec, 0x29, (mode->htotal << 4) & 0xff);
 48	regmap_write(adv->regmap_cec, 0x2a, hsw >> 4);
 49	regmap_write(adv->regmap_cec, 0x2b, (hsw << 4) & 0xff);
 50	regmap_write(adv->regmap_cec, 0x2c, hfp >> 4);
 51	regmap_write(adv->regmap_cec, 0x2d, (hfp << 4) & 0xff);
 52	regmap_write(adv->regmap_cec, 0x2e, hbp >> 4);
 53	regmap_write(adv->regmap_cec, 0x2f, (hbp << 4) & 0xff);
 54
 55	/* vertical porch params */
 56	regmap_write(adv->regmap_cec, 0x30, mode->vtotal >> 4);
 57	regmap_write(adv->regmap_cec, 0x31, (mode->vtotal << 4) & 0xff);
 58	regmap_write(adv->regmap_cec, 0x32, vsw >> 4);
 59	regmap_write(adv->regmap_cec, 0x33, (vsw << 4) & 0xff);
 60	regmap_write(adv->regmap_cec, 0x34, vfp >> 4);
 61	regmap_write(adv->regmap_cec, 0x35, (vfp << 4) & 0xff);
 62	regmap_write(adv->regmap_cec, 0x36, vbp >> 4);
 63	regmap_write(adv->regmap_cec, 0x37, (vbp << 4) & 0xff);
 64}
 65
 66void adv7533_dsi_power_on(struct adv7511 *adv)
 67{
 68	struct mipi_dsi_device *dsi = adv->dsi;
 69
 70	if (adv->use_timing_gen)
 71		adv7511_dsi_config_timing_gen(adv);
 72
 73	/* set number of dsi lanes */
 74	regmap_write(adv->regmap_cec, 0x1c, dsi->lanes << 4);
 75
 76	if (adv->use_timing_gen) {
 77		/* reset internal timing generator */
 78		regmap_write(adv->regmap_cec, 0x27, 0xcb);
 79		regmap_write(adv->regmap_cec, 0x27, 0x8b);
 80		regmap_write(adv->regmap_cec, 0x27, 0xcb);
 81	} else {
 82		/* disable internal timing generator */
 83		regmap_write(adv->regmap_cec, 0x27, 0x0b);
 84	}
 85
 86	/* enable hdmi */
 87	regmap_write(adv->regmap_cec, 0x03, 0x89);
 88	/* disable test mode */
 89	regmap_write(adv->regmap_cec, 0x55, 0x00);
 90
 91	regmap_register_patch(adv->regmap_cec, adv7533_cec_fixed_registers,
 92			      ARRAY_SIZE(adv7533_cec_fixed_registers));
 93}
 94
 95void adv7533_dsi_power_off(struct adv7511 *adv)
 96{
 97	/* disable hdmi */
 98	regmap_write(adv->regmap_cec, 0x03, 0x0b);
 99	/* disable internal timing generator */
100	regmap_write(adv->regmap_cec, 0x27, 0x0b);
101}
102
103enum drm_mode_status adv7533_mode_valid(struct adv7511 *adv,
104					const struct drm_display_mode *mode)
105{
106	int lanes;
107	struct mipi_dsi_device *dsi = adv->dsi;
108
109	if (mode->clock > 80000)
110		lanes = 4;
111	else
112		lanes = 3;
113
114	/*
115	 * TODO: add support for dynamic switching of lanes
116	 * by using the bridge pre_enable() op . Till then filter
117	 * out the modes which shall need different number of lanes
118	 * than what was configured in the device tree.
119	 */
120	if (lanes != dsi->lanes)
121		return MODE_BAD;
122
123	return MODE_OK;
124}
125
126int adv7533_patch_registers(struct adv7511 *adv)
127{
128	return regmap_register_patch(adv->regmap,
129				     adv7533_fixed_registers,
130				     ARRAY_SIZE(adv7533_fixed_registers));
131}
132
133int adv7533_patch_cec_registers(struct adv7511 *adv)
134{
135	return regmap_register_patch(adv->regmap_cec,
136				    adv7533_cec_fixed_registers,
137				    ARRAY_SIZE(adv7533_cec_fixed_registers));
138}
139
140int adv7533_attach_dsi(struct adv7511 *adv)
141{
142	struct device *dev = &adv->i2c_main->dev;
143	struct mipi_dsi_host *host;
144	struct mipi_dsi_device *dsi;
145	int ret = 0;
146	const struct mipi_dsi_device_info info = { .type = "adv7533",
147						   .channel = 0,
148						   .node = NULL,
149						 };
150
151	host = of_find_mipi_dsi_host_by_node(adv->host_node);
152	if (!host)
153		return dev_err_probe(dev, -EPROBE_DEFER,
154				     "failed to find dsi host\n");
155
156	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
157	if (IS_ERR(dsi))
158		return dev_err_probe(dev, PTR_ERR(dsi),
159				     "failed to create dsi device\n");
160
161	adv->dsi = dsi;
162
163	dsi->lanes = adv->num_dsi_lanes;
164	dsi->format = MIPI_DSI_FMT_RGB888;
165	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
166			  MIPI_DSI_MODE_NO_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
167
168	ret = devm_mipi_dsi_attach(dev, dsi);
169	if (ret < 0)
170		return dev_err_probe(dev, ret, "failed to attach dsi to host\n");
171
172	return 0;
173}
174
175int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
176{
177	u32 num_lanes;
178
179	of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
180
181	if (num_lanes < 1 || num_lanes > 4)
182		return -EINVAL;
183
184	adv->num_dsi_lanes = num_lanes;
185
186	adv->host_node = of_graph_get_remote_node(np, 0, 0);
187	if (!adv->host_node)
188		return -ENODEV;
189
190	of_node_put(adv->host_node);
191
192	adv->use_timing_gen = !of_property_read_bool(np,
193						"adi,disable-timing-generator");
194
195	/* TODO: Check if these need to be parsed by DT or not */
196	adv->rgb = true;
197	adv->embedded_sync = false;
198
199	return 0;
200}