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drm/panel: Add Sitronix ST7701 panel driver

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ST7701 designed for small and medium sizes of TFT LCD display, is
capable of supporting up to 480RGBX864 in resolution. It provides
several system interfaces like MIPI/RGB/SPI.

Currently added support for Techstar TS8550B which is ST7701 based
480x854, 2-lane MIPI DSI LCD panel.

Driver now registering mipi_dsi device, but indeed it can extendable
for RGB if any requirement trigger in future.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190124215131.17452-2-jagan@amarulasolutions.com
This commit is contained in:
Jagan Teki 2019-01-25 03:21:31 +05:30 committed by Thierry Reding
parent 24de022b81
commit 849b2e3ff9
4 changed files with 443 additions and 0 deletions
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6
MAINTAINERS
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@ -4894,6 +4894,12 @@ S: Orphan / Obsolete
F: drivers/gpu/drm/sis/
F: include/uapi/drm/sis_drm.h
DRM DRIVER FOR SITRONIX ST7701 PANELS
M: Jagan Teki <jagan@amarulasolutions.com>
S: Maintained
F: drivers/gpu/drm/panel/panel-sitronix-st7701.c
F: Documentation/devicetree/bindings/display/panel/sitronix,st7701.txt
DRM DRIVER FOR SITRONIX ST7586 PANELS
M: David Lechner <david@lechnology.com>
S: Maintained

10
drivers/gpu/drm/panel/Kconfig
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@ -196,6 +196,16 @@ config DRM_PANEL_SHARP_LS043T1LE01
Say Y here if you want to enable support for Sharp LS043T1LE01 qHD
(540x960) DSI panel as found on the Qualcomm APQ8074 Dragonboard
config DRM_PANEL_SITRONIX_ST7701
tristate "Sitronix ST7701 panel driver"
depends on OF
depends on DRM_MIPI_DSI
depends on BACKLIGHT_CLASS_DEVICE
help
Say Y here if you want to enable support for the Sitronix
ST7701 controller for 480X864 LCD panels with MIPI/RGB/SPI
system interfaces.
config DRM_PANEL_SITRONIX_ST7789V
tristate "Sitronix ST7789V panel"
depends on OF && SPI

1
drivers/gpu/drm/panel/Makefile
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@ -20,6 +20,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o

426
drivers/gpu/drm/panel/panel-sitronix-st7701.c Normal file
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@ -0,0 +1,426 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019, Amarula Solutions.
* Author: Jagan Teki <jagan@amarulasolutions.com>
*/
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <video/mipi_display.h>
/* Command2 BKx selection command */
#define DSI_CMD2BKX_SEL 0xFF
/* Command2, BK0 commands */
#define DSI_CMD2_BK0_PVGAMCTRL 0xB0 /* Positive Voltage Gamma Control */
#define DSI_CMD2_BK0_NVGAMCTRL 0xB1 /* Negative Voltage Gamma Control */
#define DSI_CMD2_BK0_LNESET 0xC0 /* Display Line setting */
#define DSI_CMD2_BK0_PORCTRL 0xC1 /* Porch control */
#define DSI_CMD2_BK0_INVSEL 0xC2 /* Inversion selection, Frame Rate Control */
/* Command2, BK1 commands */
#define DSI_CMD2_BK1_VRHS 0xB0 /* Vop amplitude setting */
#define DSI_CMD2_BK1_VCOM 0xB1 /* VCOM amplitude setting */
#define DSI_CMD2_BK1_VGHSS 0xB2 /* VGH Voltage setting */
#define DSI_CMD2_BK1_TESTCMD 0xB3 /* TEST Command Setting */
#define DSI_CMD2_BK1_VGLS 0xB5 /* VGL Voltage setting */
#define DSI_CMD2_BK1_PWCTLR1 0xB7 /* Power Control 1 */
#define DSI_CMD2_BK1_PWCTLR2 0xB8 /* Power Control 2 */
#define DSI_CMD2_BK1_SPD1 0xC1 /* Source pre_drive timing set1 */
#define DSI_CMD2_BK1_SPD2 0xC2 /* Source EQ2 Setting */
#define DSI_CMD2_BK1_MIPISET1 0xD0 /* MIPI Setting 1 */
/**
* Command2 with BK function selection.
*
* BIT[4, 0]: [CN2, BKXSEL]
* 10 = CMD2BK0, Command2 BK0
* 11 = CMD2BK1, Command2 BK1
* 00 = Command2 disable
*/
#define DSI_CMD2BK1_SEL 0x11
#define DSI_CMD2BK0_SEL 0x10
#define DSI_CMD2BKX_SEL_NONE 0x00
/* Command2, BK0 bytes */
#define DSI_LINESET_LINE 0x69
#define DSI_LINESET_LDE_EN BIT(7)
#define DSI_LINESET_LINEDELTA GENMASK(1, 0)
#define DSI_CMD2_BK0_LNESET_B1 DSI_LINESET_LINEDELTA
#define DSI_CMD2_BK0_LNESET_B0 (DSI_LINESET_LDE_EN | DSI_LINESET_LINE)
#define DSI_INVSEL_DEFAULT GENMASK(5, 4)
#define DSI_INVSEL_NLINV GENMASK(2, 0)
#define DSI_INVSEL_RTNI GENMASK(2, 1)
#define DSI_CMD2_BK0_INVSEL_B1 DSI_INVSEL_RTNI
#define DSI_CMD2_BK0_INVSEL_B0 (DSI_INVSEL_DEFAULT | DSI_INVSEL_NLINV)
#define DSI_CMD2_BK0_PORCTRL_B0(m) ((m)->vtotal - (m)->vsync_end)
#define DSI_CMD2_BK0_PORCTRL_B1(m) ((m)->vsync_start - (m)->vdisplay)
/* Command2, BK1 bytes */
#define DSI_CMD2_BK1_VRHA_SET 0x45
#define DSI_CMD2_BK1_VCOM_SET 0x13
#define DSI_CMD2_BK1_VGHSS_SET GENMASK(2, 0)
#define DSI_CMD2_BK1_TESTCMD_VAL BIT(7)
#define DSI_VGLS_DEFAULT BIT(6)
#define DSI_VGLS_SEL GENMASK(2, 0)
#define DSI_CMD2_BK1_VGLS_SET (DSI_VGLS_DEFAULT | DSI_VGLS_SEL)
#define DSI_PWCTLR1_AP BIT(7) /* Gamma OP bias, max */
#define DSI_PWCTLR1_APIS BIT(2) /* Source OP input bias, min */
#define DSI_PWCTLR1_APOS BIT(0) /* Source OP output bias, min */
#define DSI_CMD2_BK1_PWCTLR1_SET (DSI_PWCTLR1_AP | DSI_PWCTLR1_APIS | \
DSI_PWCTLR1_APOS)
#define DSI_PWCTLR2_AVDD BIT(5) /* AVDD 6.6v */
#define DSI_PWCTLR2_AVCL 0x0 /* AVCL -4.4v */
#define DSI_CMD2_BK1_PWCTLR2_SET (DSI_PWCTLR2_AVDD | DSI_PWCTLR2_AVCL)
#define DSI_SPD1_T2D BIT(3)
#define DSI_CMD2_BK1_SPD1_SET (GENMASK(6, 4) | DSI_SPD1_T2D)
#define DSI_CMD2_BK1_SPD2_SET DSI_CMD2_BK1_SPD1_SET
#define DSI_MIPISET1_EOT_EN BIT(3)
#define DSI_CMD2_BK1_MIPISET1_SET (BIT(7) | DSI_MIPISET1_EOT_EN)
struct st7701_panel_desc {
const struct drm_display_mode *mode;
unsigned int lanes;
unsigned long flags;
enum mipi_dsi_pixel_format format;
const char *const *supply_names;
unsigned int num_supplies;
unsigned int panel_sleep_delay;
};
struct st7701 {
struct drm_panel panel;
struct mipi_dsi_device *dsi;
const struct st7701_panel_desc *desc;
struct backlight_device *backlight;
struct regulator_bulk_data *supplies;
struct gpio_desc *reset;
unsigned int sleep_delay;
};
static inline struct st7701 *panel_to_st7701(struct drm_panel *panel)
{
return container_of(panel, struct st7701, panel);
}
static inline int st7701_dsi_write(struct st7701 *st7701, const void *seq,
size_t len)
{
return mipi_dsi_dcs_write_buffer(st7701->dsi, seq, len);
}
#define ST7701_DSI(st7701, seq...) \
{ \
const u8 d[] = { seq }; \
st7701_dsi_write(st7701, d, ARRAY_SIZE(d)); \
}
static void st7701_init_sequence(struct st7701 *st7701)
{
const struct drm_display_mode *mode = st7701->desc->mode;
ST7701_DSI(st7701, MIPI_DCS_SOFT_RESET, 0x00);
/* We need to wait 5ms before sending new commands */
msleep(5);
ST7701_DSI(st7701, MIPI_DCS_EXIT_SLEEP_MODE, 0x00);
msleep(st7701->sleep_delay);
/* Command2, BK0 */
ST7701_DSI(st7701, DSI_CMD2BKX_SEL,
0x77, 0x01, 0x00, 0x00, DSI_CMD2BK0_SEL);
ST7701_DSI(st7701, DSI_CMD2_BK0_PVGAMCTRL, 0x00, 0x0E, 0x15, 0x0F,
0x11, 0x08, 0x08, 0x08, 0x08, 0x23, 0x04, 0x13, 0x12,
0x2B, 0x34, 0x1F);
ST7701_DSI(st7701, DSI_CMD2_BK0_NVGAMCTRL, 0x00, 0x0E, 0x95, 0x0F,
0x13, 0x07, 0x09, 0x08, 0x08, 0x22, 0x04, 0x10, 0x0E,
0x2C, 0x34, 0x1F);
ST7701_DSI(st7701, DSI_CMD2_BK0_LNESET,
DSI_CMD2_BK0_LNESET_B0, DSI_CMD2_BK0_LNESET_B1);
ST7701_DSI(st7701, DSI_CMD2_BK0_PORCTRL,
DSI_CMD2_BK0_PORCTRL_B0(mode),
DSI_CMD2_BK0_PORCTRL_B1(mode));
ST7701_DSI(st7701, DSI_CMD2_BK0_INVSEL,
DSI_CMD2_BK0_INVSEL_B0, DSI_CMD2_BK0_INVSEL_B1);
/* Command2, BK1 */
ST7701_DSI(st7701, DSI_CMD2BKX_SEL,
0x77, 0x01, 0x00, 0x00, DSI_CMD2BK1_SEL);
ST7701_DSI(st7701, DSI_CMD2_BK1_VRHS, DSI_CMD2_BK1_VRHA_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_VCOM, DSI_CMD2_BK1_VCOM_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_VGHSS, DSI_CMD2_BK1_VGHSS_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_TESTCMD, DSI_CMD2_BK1_TESTCMD_VAL);
ST7701_DSI(st7701, DSI_CMD2_BK1_VGLS, DSI_CMD2_BK1_VGLS_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_PWCTLR1, DSI_CMD2_BK1_PWCTLR1_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_PWCTLR2, DSI_CMD2_BK1_PWCTLR2_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_SPD1, DSI_CMD2_BK1_SPD1_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_SPD2, DSI_CMD2_BK1_SPD2_SET);
ST7701_DSI(st7701, DSI_CMD2_BK1_MIPISET1, DSI_CMD2_BK1_MIPISET1_SET);
/**
* ST7701_SPEC_V1.2 is unable to provide enough information above this
* specific command sequence, so grab the same from vendor BSP driver.
*/
ST7701_DSI(st7701, 0xE0, 0x00, 0x00, 0x02);
ST7701_DSI(st7701, 0xE1, 0x0B, 0x00, 0x0D, 0x00, 0x0C, 0x00, 0x0E,
0x00, 0x00, 0x44, 0x44);
ST7701_DSI(st7701, 0xE2, 0x33, 0x33, 0x44, 0x44, 0x64, 0x00, 0x66,
0x00, 0x65, 0x00, 0x67, 0x00, 0x00);
ST7701_DSI(st7701, 0xE3, 0x00, 0x00, 0x33, 0x33);
ST7701_DSI(st7701, 0xE4, 0x44, 0x44);
ST7701_DSI(st7701, 0xE5, 0x0C, 0x78, 0x3C, 0xA0, 0x0E, 0x78, 0x3C,
0xA0, 0x10, 0x78, 0x3C, 0xA0, 0x12, 0x78, 0x3C, 0xA0);
ST7701_DSI(st7701, 0xE6, 0x00, 0x00, 0x33, 0x33);
ST7701_DSI(st7701, 0xE7, 0x44, 0x44);
ST7701_DSI(st7701, 0xE8, 0x0D, 0x78, 0x3C, 0xA0, 0x0F, 0x78, 0x3C,
0xA0, 0x11, 0x78, 0x3C, 0xA0, 0x13, 0x78, 0x3C, 0xA0);
ST7701_DSI(st7701, 0xEB, 0x02, 0x02, 0x39, 0x39, 0xEE, 0x44, 0x00);
ST7701_DSI(st7701, 0xEC, 0x00, 0x00);
ST7701_DSI(st7701, 0xED, 0xFF, 0xF1, 0x04, 0x56, 0x72, 0x3F, 0xFF,
0xFF, 0xFF, 0xFF, 0xF3, 0x27, 0x65, 0x40, 0x1F, 0xFF);
/* disable Command2 */
ST7701_DSI(st7701, DSI_CMD2BKX_SEL,
0x77, 0x01, 0x00, 0x00, DSI_CMD2BKX_SEL_NONE);
}
static int st7701_prepare(struct drm_panel *panel)
{
struct st7701 *st7701 = panel_to_st7701(panel);
int ret;
gpiod_set_value(st7701->reset, 0);
ret = regulator_bulk_enable(st7701->desc->num_supplies,
st7701->supplies);
if (ret < 0)
return ret;
msleep(20);
gpiod_set_value(st7701->reset, 1);
msleep(150);
st7701_init_sequence(st7701);
return 0;
}
static int st7701_enable(struct drm_panel *panel)
{
struct st7701 *st7701 = panel_to_st7701(panel);
ST7701_DSI(st7701, MIPI_DCS_SET_DISPLAY_ON, 0x00);
backlight_enable(st7701->backlight);
return 0;
}
static int st7701_disable(struct drm_panel *panel)
{
struct st7701 *st7701 = panel_to_st7701(panel);
backlight_disable(st7701->backlight);
ST7701_DSI(st7701, MIPI_DCS_SET_DISPLAY_OFF, 0x00);
return 0;
}
static int st7701_unprepare(struct drm_panel *panel)
{
struct st7701 *st7701 = panel_to_st7701(panel);
ST7701_DSI(st7701, MIPI_DCS_ENTER_SLEEP_MODE, 0x00);
msleep(st7701->sleep_delay);
gpiod_set_value(st7701->reset, 0);
/**
* During the Resetting period, the display will be blanked
* (The display is entering blanking sequence, which maximum
* time is 120 ms, when Reset Starts in Sleep Out –mode. The
* display remains the blank state in Sleep In –mode.) and
* then return to Default condition for Hardware Reset.
*
* So we need wait sleep_delay time to make sure reset completed.
*/
msleep(st7701->sleep_delay);
regulator_bulk_disable(st7701->desc->num_supplies, st7701->supplies);
return 0;
}
static int st7701_get_modes(struct drm_panel *panel)
{
struct st7701 *st7701 = panel_to_st7701(panel);
const struct drm_display_mode *desc_mode = st7701->desc->mode;
struct drm_display_mode *mode;
mode = drm_mode_duplicate(panel->drm, desc_mode);
if (!mode) {
DRM_DEV_ERROR(&st7701->dsi->dev,
"failed to add mode %ux%ux@%u\n",
desc_mode->hdisplay, desc_mode->vdisplay,
desc_mode->vrefresh);
return -ENOMEM;
}
drm_mode_set_name(mode);
drm_mode_probed_add(panel->connector, mode);
panel->connector->display_info.width_mm = desc_mode->width_mm;
panel->connector->display_info.height_mm = desc_mode->height_mm;
return 1;
}
static const struct drm_panel_funcs st7701_funcs = {
.disable = st7701_disable,
.unprepare = st7701_unprepare,
.prepare = st7701_prepare,
.enable = st7701_enable,
.get_modes = st7701_get_modes,
};
static const struct drm_display_mode ts8550b_mode = {
.clock = 27500,
.hdisplay = 480,
.hsync_start = 480 + 38,
.hsync_end = 480 + 38 + 12,
.htotal = 480 + 38 + 12 + 12,
.vdisplay = 854,
.vsync_start = 854 + 4,
.vsync_end = 854 + 4 + 8,
.vtotal = 854 + 4 + 8 + 18,
.width_mm = 69,
.height_mm = 139,
.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
};
static const char * const ts8550b_supply_names[] = {
"VCC",
"IOVCC",
};
static const struct st7701_panel_desc ts8550b_desc = {
.mode = &ts8550b_mode,
.lanes = 2,
.flags = MIPI_DSI_MODE_VIDEO,
.format = MIPI_DSI_FMT_RGB888,
.supply_names = ts8550b_supply_names,
.num_supplies = ARRAY_SIZE(ts8550b_supply_names),
.panel_sleep_delay = 80, /* panel need extra 80ms for sleep out cmd */
};
static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
{
const struct st7701_panel_desc *desc;
struct st7701 *st7701;
int ret, i;
st7701 = devm_kzalloc(&dsi->dev, sizeof(*st7701), GFP_KERNEL);
if (!st7701)
return -ENOMEM;
desc = of_device_get_match_data(&dsi->dev);
dsi->mode_flags = desc->flags;
dsi->format = desc->format;
dsi->lanes = desc->lanes;
st7701->supplies = devm_kcalloc(&dsi->dev, desc->num_supplies,
sizeof(*st7701->supplies),
GFP_KERNEL);
if (!st7701->supplies)
return -ENOMEM;
for (i = 0; i < desc->num_supplies; i++)
st7701->supplies[i].supply = desc->supply_names[i];
ret = devm_regulator_bulk_get(&dsi->dev, desc->num_supplies,
st7701->supplies);
if (ret < 0)
return ret;
st7701->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(st7701->reset)) {
DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
return PTR_ERR(st7701->reset);
}
st7701->backlight = devm_of_find_backlight(&dsi->dev);
if (IS_ERR(st7701->backlight))
return PTR_ERR(st7701->backlight);
drm_panel_init(&st7701->panel);
/**
* Once sleep out has been issued, ST7701 IC required to wait 120ms
* before initiating new commands.
*
* On top of that some panels might need an extra delay to wait, so
* add panel specific delay for those cases. As now this panel specific
* delay information is referenced from those panel BSP driver, example
* ts8550b and there is no valid documentation for that.
*/
st7701->sleep_delay = 120 + desc->panel_sleep_delay;
st7701->panel.funcs = &st7701_funcs;
st7701->panel.dev = &dsi->dev;
ret = drm_panel_add(&st7701->panel);
if (ret < 0)
return ret;
mipi_dsi_set_drvdata(dsi, st7701);
st7701->dsi = dsi;
st7701->desc = desc;
return mipi_dsi_attach(dsi);
}
static int st7701_dsi_remove(struct mipi_dsi_device *dsi)
{
struct st7701 *st7701 = mipi_dsi_get_drvdata(dsi);
mipi_dsi_detach(dsi);
drm_panel_remove(&st7701->panel);
return 0;
}
static const struct of_device_id st7701_of_match[] = {
{ .compatible = "techstar,ts8550b", .data = &ts8550b_desc },
{ }
};
MODULE_DEVICE_TABLE(of, st7701_of_match);
static struct mipi_dsi_driver st7701_dsi_driver = {
.probe = st7701_dsi_probe,
.remove = st7701_dsi_remove,
.driver = {
.name = "st7701",
.of_match_table = st7701_of_match,
},
};
module_mipi_dsi_driver(st7701_dsi_driver);
MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
MODULE_DESCRIPTION("Sitronix ST7701 LCD Panel Driver");
MODULE_LICENSE("GPL");