1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * DSI interface to the Samsung S6E63M0 panel.
  4 * (C) 2019 Linus Walleij
  5 */
  6
  7#include <linux/module.h>
  8#include <linux/delay.h>
  9#include <linux/mod_devicetable.h>
 10
 11#include <drm/drm_mipi_dsi.h>
 12#include <drm/drm_print.h>
 13
 14#include "panel-samsung-s6e63m0.h"
 15
 16#define MCS_GLOBAL_PARAM	0xb0
 17#define S6E63M0_DSI_MAX_CHUNK	15 /* CMD + 15 bytes max */
 18
 19static int s6e63m0_dsi_dcs_read(struct device *dev, void *trsp,
 20				const u8 cmd, u8 *data)
 21{
 22	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 23	int ret;
 24
 25	ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
 26	if (ret < 0) {
 27		dev_err(dev, "could not read DCS CMD %02x\n", cmd);
 28		return ret;
 29	}
 30
 31	dev_dbg(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
 32
 33	return 0;
 34}
 35
 36static int s6e63m0_dsi_dcs_write(struct device *dev, void *trsp,
 37				 const u8 *data, size_t len)
 38{
 39	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 40	const u8 *seqp = data;
 41	u8 cmd;
 42	u8 cmdwritten;
 43	int remain;
 44	int chunk;
 45	int ret;
 46
 47	dev_dbg(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
 48
 49	/* Pick out and skip past the DCS command */
 50	cmd = *seqp;
 51	seqp++;
 52	cmdwritten = 0;
 53	remain = len - 1;
 54	chunk = remain;
 55
 56	/* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
 57	if (chunk > S6E63M0_DSI_MAX_CHUNK)
 58		chunk = S6E63M0_DSI_MAX_CHUNK;
 59	ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
 60	if (ret < 0) {
 61		dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
 62		return ret;
 63	}
 64	cmdwritten += chunk;
 65	seqp += chunk;
 66
 67	while (cmdwritten < remain) {
 68		chunk = remain - cmdwritten;
 69		if (chunk > S6E63M0_DSI_MAX_CHUNK)
 70			chunk = S6E63M0_DSI_MAX_CHUNK;
 71		ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
 72		if (ret < 0) {
 73			dev_err(dev, "error sending CMD %02x global param %02x\n",
 74				cmd, cmdwritten);
 75			return ret;
 76		}
 77		ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
 78		if (ret < 0) {
 79			dev_err(dev, "error sending CMD %02x chunk\n", cmd);
 80			return ret;
 81		}
 82		cmdwritten += chunk;
 83		seqp += chunk;
 84	}
 85	dev_dbg(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
 86
 87	usleep_range(8000, 9000);
 88
 89	return 0;
 90}
 91
 92static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
 93{
 94	struct device *dev = &dsi->dev;
 95	int ret;
 96
 97	dsi->lanes = 2;
 98	dsi->format = MIPI_DSI_FMT_RGB888;
 99	dsi->hs_rate = 349440000;
100	dsi->lp_rate = 9600000;
101	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
102		MIPI_DSI_MODE_VIDEO_BURST;
103
104	ret = s6e63m0_probe(dev, NULL, s6e63m0_dsi_dcs_read,
105			    s6e63m0_dsi_dcs_write, true);
106	if (ret)
107		return ret;
108
109	ret = mipi_dsi_attach(dsi);
110	if (ret < 0)
111		s6e63m0_remove(dev);
112
113	return ret;
114}
115
116static void s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
117{
118	mipi_dsi_detach(dsi);
119	s6e63m0_remove(&dsi->dev);
120}
121
122static const struct of_device_id s6e63m0_dsi_of_match[] = {
123	{ .compatible = "samsung,s6e63m0" },
124	{ /* sentinel */ }
125};
126MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
127
128static struct mipi_dsi_driver s6e63m0_dsi_driver = {
129	.probe			= s6e63m0_dsi_probe,
130	.remove			= s6e63m0_dsi_remove,
131	.driver			= {
132		.name		= "panel-samsung-s6e63m0",
133		.of_match_table = s6e63m0_dsi_of_match,
134	},
135};
136module_mipi_dsi_driver(s6e63m0_dsi_driver);
137
138MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
139MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
140MODULE_LICENSE("GPL v2");