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drm/panel: Add Samsung s6e88a0-ams452ef01 panel driver
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Add driver for Samsung AMS452EF01 AMOLED panel, which makes
use of their S6E88A0 controller.

Signed-off-by: Michael Srba <Michael.Srba@seznam.cz>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
[fixed checkpatch warnings, added changelog]
Link: https://patchwork.freedesktop.org/patch/msgid/20200130203555.316-2-michael.srba@seznam.cz
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Michael Srba authored and Sam Ravnborg committed Jan 30, 2020
1 parent 1dff44e commit 6d598a3
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6 changes: 6 additions & 0 deletions drivers/gpu/drm/panel/Kconfig
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Expand Up @@ -293,6 +293,12 @@ config DRM_PANEL_SAMSUNG_S6E63M0
Say Y here if you want to enable support for Samsung S6E63M0
AMOLED LCD panel.

config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01
tristate "Samsung AMS452EF01 panel with S6E88A0 DSI video mode controller"
depends on OF
select DRM_MIPI_DSI
select VIDEOMODE_HELPERS

config DRM_PANEL_SAMSUNG_S6E8AA0
tristate "Samsung S6E8AA0 DSI video mode panel"
depends on OF
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1 change: 1 addition & 0 deletions drivers/gpu/drm/panel/Makefile
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Expand Up @@ -30,6 +30,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01) += panel-samsung-s6e88a0-ams452ef01.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
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293 changes: 293 additions & 0 deletions drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
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// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2019, Michael Srba

#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

#include <video/mipi_display.h>

#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>

struct s6e88a0_ams452ef01 {
struct drm_panel panel;
struct mipi_dsi_device *dsi;
struct regulator_bulk_data supplies[2];
struct gpio_desc *reset_gpio;

bool prepared;
};

static inline struct
s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
{
return container_of(panel, struct s6e88a0_ams452ef01, panel);
}

#define dsi_dcs_write_seq(dsi, seq...) do { \
static const u8 d[] = { seq }; \
int ret; \
ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d)); \
if (ret < 0) \
return ret; \
} while (0)

static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
{
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
usleep_range(5000, 6000);
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
usleep_range(1000, 2000);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
usleep_range(10000, 11000);
}

static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct device *dev = &dsi->dev;
int ret;

dsi->mode_flags |= MIPI_DSI_MODE_LPM;

dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity

ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
if (ret < 0) {
dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
return ret;
}
msleep(120);

// set default brightness/gama
dsi_dcs_write_seq(dsi, 0xca,
0x01, 0x00, 0x01, 0x00, 0x01, 0x00, // V255 RR,GG,BB
0x80, 0x80, 0x80, // V203 R,G,B
0x80, 0x80, 0x80, // V151 R,G,B
0x80, 0x80, 0x80, // V87 R,G,B
0x80, 0x80, 0x80, // V51 R,G,B
0x80, 0x80, 0x80, // V35 R,G,B
0x80, 0x80, 0x80, // V23 R,G,B
0x80, 0x80, 0x80, // V11 R,G,B
0x6b, 0x68, 0x71, // V3 R,G,B
0x00, 0x00, 0x00); // V1 R,G,B
// set default Amoled Off Ratio
dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);
dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage
dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update
dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands

ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret < 0) {
dev_err(dev, "Failed to set display on: %d\n", ret);
return ret;
}

return 0;
}

static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct device *dev = &dsi->dev;
int ret;

dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

ret = mipi_dsi_dcs_set_display_off(dsi);
if (ret < 0) {
dev_err(dev, "Failed to set display off: %d\n", ret);
return ret;
}
msleep(35);

ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
if (ret < 0) {
dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
return ret;
}
msleep(120);

return 0;
}

static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
{
struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
struct device *dev = &ctx->dsi->dev;
int ret;

if (ctx->prepared)
return 0;

ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
if (ret < 0) {
dev_err(dev, "Failed to enable regulators: %d\n", ret);
return ret;
}

s6e88a0_ams452ef01_reset(ctx);

ret = s6e88a0_ams452ef01_on(ctx);
if (ret < 0) {
dev_err(dev, "Failed to initialize panel: %d\n", ret);
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
ctx->supplies);
return ret;
}

ctx->prepared = true;
return 0;
}

static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
{
struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
struct device *dev = &ctx->dsi->dev;
int ret;

if (!ctx->prepared)
return 0;

ret = s6e88a0_ams452ef01_off(ctx);
if (ret < 0)
dev_err(dev, "Failed to un-initialize panel: %d\n", ret);

gpiod_set_value_cansleep(ctx->reset_gpio, 0);
regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);

ctx->prepared = false;
return 0;
}

static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
.hdisplay = 540,
.hsync_start = 540 + 88,
.hsync_end = 540 + 88 + 4,
.htotal = 540 + 88 + 4 + 20,
.vdisplay = 960,
.vsync_start = 960 + 14,
.vsync_end = 960 + 14 + 2,
.vtotal = 960 + 14 + 2 + 8,
.vrefresh = 60,
.width_mm = 56,
.height_mm = 100,
};

static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;

mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
if (!mode)
return -ENOMEM;

drm_mode_set_name(mode);

mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
drm_mode_probed_add(connector, mode);

return 1;
}

static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
.unprepare = s6e88a0_ams452ef01_unprepare,
.prepare = s6e88a0_ams452ef01_prepare,
.get_modes = s6e88a0_ams452ef01_get_modes,
};

static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct s6e88a0_ams452ef01 *ctx;
int ret;

ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;

ctx->supplies[0].supply = "vdd3";
ctx->supplies[1].supply = "vci";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
ctx->supplies);
if (ret < 0) {
dev_err(dev, "Failed to get regulators: %d\n", ret);
return ret;
}

ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ctx->reset_gpio)) {
ret = PTR_ERR(ctx->reset_gpio);
dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
return ret;
}

ctx->dsi = dsi;
mipi_dsi_set_drvdata(dsi, ctx);

dsi->lanes = 2;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;

drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
DRM_MODE_CONNECTOR_DSI);

ret = drm_panel_add(&ctx->panel);
if (ret < 0) {
dev_err(dev, "Failed to add panel: %d\n", ret);
return ret;
}

ret = mipi_dsi_attach(dsi);
if (ret < 0) {
dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
return ret;
}

return 0;
}

static int s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
{
struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
int ret;

ret = mipi_dsi_detach(dsi);
if (ret < 0)
dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);

drm_panel_remove(&ctx->panel);

return 0;
}

static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
{ .compatible = "samsung,s6e88a0-ams452ef01" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);

static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
.probe = s6e88a0_ams452ef01_probe,
.remove = s6e88a0_ams452ef01_remove,
.driver = {
.name = "panel-s6e88a0-ams452ef01",
.of_match_table = s6e88a0_ams452ef01_of_match,
},
};
module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);

MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
MODULE_LICENSE("GPL v2");

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