1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c
new file mode 100644
index 0000000000..a89d925fdf
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DSI interface to the Samsung S6E63M0 panel.
+ * (C) 2019 Linus Walleij
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/mod_devicetable.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_print.h>
+
+#include "panel-samsung-s6e63m0.h"
+
+#define MCS_GLOBAL_PARAM	0xb0
+#define S6E63M0_DSI_MAX_CHUNK	15 /* CMD + 15 bytes max */
+
+static int s6e63m0_dsi_dcs_read(struct device *dev, void *trsp,
+				const u8 cmd, u8 *data)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
+	int ret;
+
+	ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
+	if (ret < 0) {
+		dev_err(dev, "could not read DCS CMD %02x\n", cmd);
+		return ret;
+	}
+
+	dev_dbg(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
+
+	return 0;
+}
+
+static int s6e63m0_dsi_dcs_write(struct device *dev, void *trsp,
+				 const u8 *data, size_t len)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
+	const u8 *seqp = data;
+	u8 cmd;
+	u8 cmdwritten;
+	int remain;
+	int chunk;
+	int ret;
+
+	dev_dbg(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
+
+	/* Pick out and skip past the DCS command */
+	cmd = *seqp;
+	seqp++;
+	cmdwritten = 0;
+	remain = len - 1;
+	chunk = remain;
+
+	/* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
+	if (chunk > S6E63M0_DSI_MAX_CHUNK)
+		chunk = S6E63M0_DSI_MAX_CHUNK;
+	ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
+	if (ret < 0) {
+		dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
+		return ret;
+	}
+	cmdwritten += chunk;
+	seqp += chunk;
+
+	while (cmdwritten < remain) {
+		chunk = remain - cmdwritten;
+		if (chunk > S6E63M0_DSI_MAX_CHUNK)
+			chunk = S6E63M0_DSI_MAX_CHUNK;
+		ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
+		if (ret < 0) {
+			dev_err(dev, "error sending CMD %02x global param %02x\n",
+				cmd, cmdwritten);
+			return ret;
+		}
+		ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
+		if (ret < 0) {
+			dev_err(dev, "error sending CMD %02x chunk\n", cmd);
+			return ret;
+		}
+		cmdwritten += chunk;
+		seqp += chunk;
+	}
+	dev_dbg(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
+
+	usleep_range(8000, 9000);
+
+	return 0;
+}
+
+static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->lanes = 2;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->hs_rate = 349440000;
+	dsi->lp_rate = 9600000;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+		MIPI_DSI_MODE_VIDEO_BURST;
+
+	ret = s6e63m0_probe(dev, NULL, s6e63m0_dsi_dcs_read,
+			    s6e63m0_dsi_dcs_write, true);
+	if (ret)
+		return ret;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0)
+		s6e63m0_remove(dev);
+
+	return ret;
+}
+
+static void s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
+{
+	mipi_dsi_detach(dsi);
+	s6e63m0_remove(&dsi->dev);
+}
+
+static const struct of_device_id s6e63m0_dsi_of_match[] = {
+	{ .compatible = "samsung,s6e63m0" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
+
+static struct mipi_dsi_driver s6e63m0_dsi_driver = {
+	.probe			= s6e63m0_dsi_probe,
+	.remove			= s6e63m0_dsi_remove,
+	.driver			= {
+		.name		= "panel-samsung-s6e63m0",
+		.of_match_table = s6e63m0_dsi_of_match,
+	},
+};
+module_mipi_dsi_driver(s6e63m0_dsi_driver);
+
+MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
+MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
+MODULE_LICENSE("GPL v2");