This adds support for the Ilitek ILI9322 QVGA (320x240)
TFT panel driver.
This panel driver supports serial or parallel RGB or
YUV input and also ITU-T BT.656 input streams.
The controller is combined with a physical panel and
configured through the device tree.
Cc: David Lechner <da...@lechnology.com>
Cc: Stefano Babic <sba...@denx.de>
Cc: Ben Dooks <ben.do...@codethink.co.uk>
Acked-by: Thierry Reding <tred...@nvidia.com>
Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
---
ChangeLog v2->v3:
- Fix minor checkpatch fallouts.
- Collect Thierry's ACK.
ChangeLog v1->v2:
- Dropped all DT parsing code in favor of open-coding the
display config on a per-system basis based on system-specific
compatible strings, after feedback from the DT maintainers.
- Define a set of configs for the D-Link DIR-685 router.
- Tested on the D-Link DIR-685.
---
drivers/gpu/drm/panel/Kconfig | 8 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-ilitek-ili9322.c | 962 +++++++++++++++++++++++++++
3 files changed, 971 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9322.c
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 726f3fb3312d..6ba4031f3919 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -28,6 +28,14 @@ config DRM_PANEL_SIMPLE
that it can be automatically turned off when the panel goes into a
low power state.
+config DRM_PANEL_ILITEK_IL9322
+ tristate "Ilitek ILI9322 320x240 QVGA panels"
+ depends on OF && SPI
+ select REGMAP
+ help
+ Say Y here if you want to enable support for Ilitek IL9322
+ QVGA (320x240) RGB, YUV and ITU-T BT.656 panels.
+
config DRM_PANEL_INNOLUX_P079ZCA
tristate "Innolux P079ZCA panel"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 2c4e1a93e05f..6d251ebc568c 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9322.c
b/drivers/gpu/drm/panel/panel-ilitek-ili9322.c
new file mode 100644
index 000000000000..b4ec0ecff807
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9322.c
@@ -0,0 +1,962 @@
+/*
+ * Ilitek ILI9322 TFT LCD drm_panel driver.
+ *
+ * This panel can be configured to support:
+ * - 8-bit serial RGB interface
+ * - 24-bit parallel RGB interface
+ * - 8-bit ITU-R BT.601 interface
+ * - 8-bit ITU-R BT.656 interface
+ * - Up to 320RGBx240 dots resolution TFT LCD displays
+ * - Scaling, brightness and contrast
+ *
+ * The scaling means that the display accepts a 640x480 or 720x480
+ * input and rescales it to fit to the 320x240 display. So what we
+ * present to the system is something else than what comes out on the
+ * actual display.
+ *
+ * Copyright (C) 2017 Linus Walleij <linus.wall...@linaro.org>
+ * Derived from drivers/drm/gpu/panel/panel-samsung-ld9040.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_panel.h>
+
+#include <linux/of_device.h>
+#include <linux/bitops.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#define ILI9322_CHIP_ID 0x00
+#define ILI9322_CHIP_ID_MAGIC 0x96
+
+/*
+ * Voltage on the communication interface, from 0.7 (0x00)
+ * to 1.32 (0x1f) times the VREG1OUT voltage in 2% increments.
+ * 1.00 (0x0f) is the default.
+ */
+#define ILI9322_VCOM_AMP 0x01
+
+/*
+ * High voltage on the communication signals, from 0.37 (0x00) to
+ * 1.0 (0x3f) times the VREGOUT1 voltage in 1% increments.
+ * 0.83 (0x2e) is the default.
+ */
+#define ILI9322_VCOM_HIGH 0x02
+
+/*
+ * VREG1 voltage regulator from 3.6V (0x00) to 6.0V (0x18) in 0.1V
+ * increments. 5.4V (0x12) is the default. This is the reference
+ * voltage for the VCOM levels and the greyscale level.
+ */
+#define ILI9322_VREG1_VOLTAGE 0x03
+
+/* Describes the incoming signal */
+#define ILI9322_ENTRY 0x06
+/* 0 = right-to-left, 1 = left-to-right (default), horizontal flip */
+#define ILI9322_ENTRY_HDIR BIT(0)
+/* 0 = down-to-up, 1 = up-to-down (default), vertical flip */
+#define ILI9322_ENTRY_VDIR BIT(1)
+/* NTSC, PAL or autodetect */
+#define ILI9322_ENTRY_NTSC (0 << 2)
+#define ILI9322_ENTRY_PAL (1 << 2)
+#define ILI9322_ENTRY_AUTODETECT (3 << 2)
+/* Input format */
+#define ILI9322_ENTRY_SERIAL_RGB_THROUGH (0 << 4)
+#define ILI9322_ENTRY_SERIAL_RGB_ALIGNED (1 << 4)
+#define ILI9322_ENTRY_SERIAL_RGB_DUMMY_320X240 (2 << 4)
+#define ILI9322_ENTRY_SERIAL_RGB_DUMMY_360X240 (3 << 4)
+#define ILI9322_ENTRY_DISABLE_1 (4 << 4)
+#define ILI9322_ENTRY_PARALLEL_RGB_THROUGH (5 << 4)
+#define ILI9322_ENTRY_PARALLEL_RGB_ALIGNED (6 << 4)
+#define ILI9322_ENTRY_YUV_640Y_320CBCR_25_54_MHZ (7 << 4)
+#define ILI9322_ENTRY_YUV_720Y_360CBCR_27_MHZ (8 << 4)
+#define ILI9322_ENTRY_DISABLE_2 (9 << 4)
+#define ILI9322_ENTRY_ITU_R_BT_656_720X360 (10 << 4)
+#define ILI9322_ENTRY_ITU_R_BT_656_640X320 (11 << 4)
+
+/* Power control */
+#define ILI9322_POW_CTRL 0x07
+#define ILI9322_POW_CTRL_STB BIT(0) /* 0 = standby, 1 = normal */
+#define ILI9322_POW_CTRL_VGL BIT(1) /* 0 = off, 1 = on */
+#define ILI9322_POW_CTRL_VGH BIT(2) /* 0 = off, 1 = on */
+#define ILI9322_POW_CTRL_DDVDH BIT(3) /* 0 = off, 1 = on */
+#define ILI9322_POW_CTRL_VCOM BIT(4) /* 0 = off, 1 = on */
+#define ILI9322_POW_CTRL_VCL BIT(5) /* 0 = off, 1 = on */
+#define ILI9322_POW_CTRL_AUTO BIT(6) /* 0 = interactive, 1 = auto */
+#define ILI9322_POW_CTRL_STANDBY (ILI9322_POW_CTRL_VGL | \
+ ILI9322_POW_CTRL_VGH | \
+ ILI9322_POW_CTRL_DDVDH | \
+ ILI9322_POW_CTRL_VCL | \
+ ILI9322_POW_CTRL_AUTO | \
+ BIT(7))
+#define ILI9322_POW_CTRL_DEFAULT (ILI9322_POW_CTRL_STANDBY | \
+ ILI9322_POW_CTRL_STB)
+
+/* Vertical back porch bits 0..5 */
+#define ILI9322_VBP 0x08
+
+/* Horizontal back porch, 8 bits */
+#define ILI9322_HBP 0x09
+
+/*
+ * Polarity settings:
+ * 1 = positive polarity
+ * 0 = negative polarity
+ */
+#define ILI9322_POL 0x0a
+#define ILI9322_POL_DCLK BIT(0) /* 1 default */
+#define ILI9322_POL_HSYNC BIT(1) /* 0 default */
+#define ILI9322_POL_VSYNC BIT(2) /* 0 default */
+#define ILI9322_POL_DE BIT(3) /* 1 default */
+/*
+ * 0 means YCBCR are ordered Cb0,Y0,Cr0,Y1,Cb2,Y2,Cr2,Y3 (default)
+ * in RGB mode this means RGB comes in RGBRGB
+ * 1 means YCBCR are ordered Cr0,Y0,Cb0,Y1,Cr2,Y2,Cb2,Y3
+ * in RGB mode this means RGB comes in BGRBGR
+ */
+#define ILI9322_POL_YCBCR_MODE BIT(4)
+/* Formula A for YCbCR->RGB = 0, Formula B = 1 */
+#define ILI9322_POL_FORMULA BIT(5)
+/* Reverse polarity: 0 = 0..255, 1 = 255..0 */
+#define ILI9322_POL_REV BIT(6)
+
+#define ILI9322_IF_CTRL 0x0b
+#define ILI9322_IF_CTRL_HSYNC_VSYNC 0x00
+#define ILI9322_IF_CTRL_HSYNC_VSYNC_DE BIT(2)
+#define ILI9322_IF_CTRL_DE_ONLY BIT(3)
+#define ILI9322_IF_CTRL_SYNC_DISABLED (BIT(2) | BIT(3))
+#define ILI9322_IF_CTRL_LINE_INVERSION BIT(0) /* Not set means frame inv */
+
+#define ILI9322_GLOBAL_RESET 0x04
+#define ILI9322_GLOBAL_RESET_ASSERT 0x00 /* bit 0 = 0 -> reset */
+
+/*
+ * 4+4 bits of negative and positive gamma correction
+ * Upper nybble, bits 4-7 are negative gamma
+ * Lower nybble, bits 0-3 are positive gamma
+ */
+#define ILI9322_GAMMA_1 0x10
+#define ILI9322_GAMMA_2 0x11
+#define ILI9322_GAMMA_3 0x12
+#define ILI9322_GAMMA_4 0x13
+#define ILI9322_GAMMA_5 0x14
+#define ILI9322_GAMMA_6 0x15
+#define ILI9322_GAMMA_7 0x16
+#define ILI9322_GAMMA_8 0x17
+
+/**
+ * enum ili9322_input - the format of the incoming signal to the panel
+ *
+ * The panel can be connected to various input streams and four of them can
+ * be selected by electronic straps on the display. However it is possible
+ * to select another mode or override the electronic default with this
+ * setting.
+ */
+enum ili9322_input {
+ ILI9322_INPUT_SRGB_THROUGH = 0x0,
+ ILI9322_INPUT_SRGB_ALIGNED = 0x1,
+ ILI9322_INPUT_SRGB_DUMMY_320X240 = 0x2,
+ ILI9322_INPUT_SRGB_DUMMY_360X240 = 0x3,
+ ILI9322_INPUT_DISABLED_1 = 0x4,
+ ILI9322_INPUT_PRGB_THROUGH = 0x5,
+ ILI9322_INPUT_PRGB_ALIGNED = 0x6,
+ ILI9322_INPUT_YUV_640X320_YCBCR = 0x7,
+ ILI9322_INPUT_YUV_720X360_YCBCR = 0x8,
+ ILI9322_INPUT_DISABLED_2 = 0x9,
+ ILI9322_INPUT_ITU_R_BT656_720X360_YCBCR = 0xa,
+ ILI9322_INPUT_ITU_R_BT656_640X320_YCBCR = 0xb,
+ ILI9322_INPUT_UNKNOWN = 0xc,
+};
+
+const char *ili9322_inputs[] = {
+ "8 bit serial RGB through",
+ "8 bit serial RGB aligned",
+ "8 bit serial RGB dummy 320x240",
+ "8 bit serial RGB dummy 360x240",
+ "disabled 1",
+ "24 bit parallel RGB through",
+ "24 bit parallel RGB aligned",
+ "24 bit YUV 640Y 320CbCr",
+ "24 bit YUV 720Y 360CbCr",
+ "disabled 2",
+ "8 bit ITU-R BT.656 720Y 360CbCr",
+ "8 bit ITU-R BT.656 640Y 320CbCr",
+};
+
+/**
+ * struct ili9322_config - the system specific ILI9322 configuration
+ * @width_mm: physical panel width [mm]
+ * @height_mm: physical panel height [mm]
+ * @flip_horizontal: flip the image horizontally (right-to-left scan)
+ * (only in RGB and YUV modes)
+ * @flip_vertical: flip the image vertically (down-to-up scan)
+ * (only in RGB and YUV modes)
+ * @input: the input/entry type used in this system, if this is set to
+ * ILI9322_INPUT_UNKNOWN the driver will try to figure it out by probing
+ * the hardware
+ * @vreg1out_mv: the output in microvolts for the VREGOUT1 regulator used
+ * to drive the physical display. Valid ranges are 3600 thru 6000 in 100
+ * microvolt increments. If not specified, hardware defaults will be
+ * used (4.5V).
+ * @vcom_high_percent: the percentage of VREGOUT1 used for the peak
+ * voltage on the communications link. Valid ranges are 37 thru 100
+ * percent. If not specified, hardware defaults will be used (91%).
+ * @vcom_amplitude_percent: the percentage of VREGOUT1 used for the
+ * peak-to-peak amplitude of the communcation signals to the physical
+ * display. Valid ranges are 70 thru 132 percent in increments if two
+ * percent. Odd percentages will be truncated. If not specified, hardware
+ * defaults will be used (114%).
+ * @dclk_active_high: data/pixel clock active high, data will be clocked
+ * in on the rising edge of the DCLK (this is usually the case).
+ * @syncmode: The synchronization mode, what sync signals are emitted.
+ * See the enum for details.
+ * @de_active_high: DE (data entry) is active high
+ * @hsync_active_high: HSYNC is active high
+ * @vsync_active_high: VSYNC is active high
+ * @gamma_corr_pos: a set of 8 nybbles describing positive
+ * gamma correction for voltages V1 thru V8. Valid range 0..15
+ * @gamma_corr_neg: a set of 8 nybbles describing negative
+ * gamma correction for voltages V1 thru V8. Valid range 0..15
+ *
+ * These adjust what grayscale voltage will be output for input data V1 = 0,
+ * V2 = 16, V3 = 48, V4 = 96, V5 = 160, V6 = 208, V7 = 240 and V8 = 255.
+ * The curve is shaped like this:
+ *
+ * ^
+ * | V8
+ * | V7
+ * | V6
+ * | V5
+ * | V4
+ * | V3
+ * | V2
+ * | V1
+ * +----------------------------------------------------------->
+ * 0 16 48 96 160 208 240 255
+ *
+ * The negative and postive gamma values adjust the V1 thru V8 up/down
+ * according to the datasheet specifications. This is a property of the
+ * physical display connected to the display controller and may vary.
+ * If defined, both arrays must be supplied in full. If the properties
+ * are not supplied, hardware defaults will be used.
+ */
+struct ili9322_config {
+ u32 width_mm;
+ u32 height_mm;
+ bool flip_horizontal;
+ bool flip_vertical;
+ enum ili9322_input input;
+ u32 vreg1out_mv;
+ u32 vcom_high_percent;
+ u32 vcom_amplitude_percent;
+ bool dclk_active_high;
+ bool de_active_high;
+ bool hsync_active_high;
+ bool vsync_active_high;
+ u8 syncmode;
+ u8 gamma_corr_pos[8];
+ u8 gamma_corr_neg[8];
+};
+
+struct ili9322 {
+ struct device *dev;
+ const struct ili9322_config *conf;
+ struct drm_panel panel;
+ struct regmap *regmap;
+ struct regulator_bulk_data supplies[3];
+ struct gpio_desc *reset_gpio;
+ enum ili9322_input input;
+ struct videomode vm;
+ u8 gamma[8];
+ u8 vreg1out;
+ u8 vcom_high;
+ u8 vcom_amplitude;
+};
+
+static inline struct ili9322 *panel_to_ili9322(struct drm_panel *panel)
+{
+ return container_of(panel, struct ili9322, panel);
+}
+
+static int ili9322_regmap_spi_write(void *context, const void *data,
+ size_t count)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+ u8 buf[2];
+
+ /* Clear bit 7 to write */
+ memcpy(buf, data, 2);
+ buf[0] &= ~0x80;
+
+ dev_dbg(dev, "WRITE: %02x %02x\n", buf[0], buf[1]);
+ return spi_write_then_read(spi, buf, 2, NULL, 0);
+}
+
+static int ili9322_regmap_spi_read(void *context, const void *reg,
+ size_t reg_size, void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+ u8 buf[1];
+
+ /* Set bit 7 to 1 to read */
+ memcpy(buf, reg, 1);
+ dev_dbg(dev, "READ: %02x reg size = %zu, val size = %zu\n",
+ buf[0], reg_size, val_size);
+ buf[0] |= 0x80;
+
+ return spi_write_then_read(spi, buf, 1, val, 1);
+}
+
+static struct regmap_bus ili9322_regmap_bus = {
+ .write = ili9322_regmap_spi_write,
+ .read = ili9322_regmap_spi_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_BIG,
+ .val_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+static bool ili9322_volatile_reg(struct device *dev, unsigned int reg)
+{
+ return false;
+}
+
+static bool ili9322_writeable_reg(struct device *dev, unsigned int reg)
+{
+ /* Just register 0 is read-only */
+ if (reg == 0x00)
+ return false;
+ return true;
+}
+
+const struct regmap_config ili9322_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x44,
+ .cache_type = REGCACHE_RBTREE,
+ .volatile_reg = ili9322_volatile_reg,
+ .writeable_reg = ili9322_writeable_reg,
+};
+
+static int ili9322_init(struct drm_panel *panel, struct ili9322 *ili)
+{
+ struct drm_connector *connector = panel->connector;
+ u8 reg;
+ int ret;
+ int i;
+
+ /* Reset display */
+ ret = regmap_write(ili->regmap, ILI9322_GLOBAL_RESET,
+ ILI9322_GLOBAL_RESET_ASSERT);
+ if (ret) {
+ dev_err(ili->dev, "can't issue GRESET (%d)\n", ret);
+ return ret;
+ }
+
+ /* Set up the main voltage regulator */
+ if (ili->vreg1out != U8_MAX) {
+ ret = regmap_write(ili->regmap, ILI9322_VREG1_VOLTAGE,
+ ili->vreg1out);
+ if (ret) {
+ dev_err(ili->dev, "can't set up VREG1OUT (%d)\n", ret);
+ return ret;
+ }
+ }
+
+ if (ili->vcom_amplitude != U8_MAX) {
+ ret = regmap_write(ili->regmap, ILI9322_VCOM_AMP,
+ ili->vcom_amplitude);
+ if (ret) {
+ dev_err(ili->dev,
+ "can't set up VCOM amplitude (%d)\n", ret);
+ return ret;
+ }
+ };
+
+ if (ili->vcom_high != U8_MAX) {
+ ret = regmap_write(ili->regmap, ILI9322_VCOM_HIGH,
+ ili->vcom_high);
+ if (ret) {
+ dev_err(ili->dev, "can't set up VCOM high (%d)\n", ret);
+ return ret;
+ }
+ };
+
+ /* Set up gamma correction */
+ for (i = 0; i < ARRAY_SIZE(ili->gamma); i++) {
+ ret = regmap_write(ili->regmap, ILI9322_GAMMA_1 + i,
+ ili->gamma[i]);
+ if (ret) {
+ dev_err(ili->dev,
+ "can't write gamma V%d to 0x%02x (%d)\n",
+ i + 1, ILI9322_GAMMA_1 + i, ret);
+ return ret;
+ }
+ }
+
+ /*
+ * Polarity and inverted color order for RGB input.
+ * None of this applies in the BT.656 mode.
+ */
+ if (ili->conf->dclk_active_high) {
+ reg = ILI9322_POL_DCLK;
+ connector->display_info.bus_flags |=
+ DRM_BUS_FLAG_PIXDATA_POSEDGE;
+ } else {
+ reg = 0;
+ connector->display_info.bus_flags |=
+ DRM_BUS_FLAG_PIXDATA_NEGEDGE;
+ }
+ if (ili->conf->de_active_high) {
+ reg |= ILI9322_POL_DE;
+ connector->display_info.bus_flags |=
+ DRM_BUS_FLAG_DE_HIGH;
+ } else {
+ connector->display_info.bus_flags |=
+ DRM_BUS_FLAG_DE_LOW;
+ }
+ if (ili->conf->hsync_active_high)
+ reg |= ILI9322_POL_HSYNC;
+ if (ili->conf->vsync_active_high)
+ reg |= ILI9322_POL_VSYNC;
+ ret = regmap_write(ili->regmap, ILI9322_POL, reg);
+ if (ret) {
+ dev_err(ili->dev, "can't write POL register (%d)\n", ret);
+ return ret;
+ }
+
+ /*
+ * Set up interface control.
+ * This is not used in the BT.656 mode (no H/Vsync or DE signals).
+ */
+ reg = ili->conf->syncmode;
+ reg |= ILI9322_IF_CTRL_LINE_INVERSION;
+ ret = regmap_write(ili->regmap, ILI9322_IF_CTRL, reg);
+ if (ret) {
+ dev_err(ili->dev, "can't write IF CTRL register (%d)\n", ret);
+ return ret;
+ }
+
+ /* Set up the input mode */
+ reg = (ili->input << 4);
+ /* These are inverted, setting to 1 is the default, clearing flips */
+ if (!ili->conf->flip_horizontal)
+ reg |= ILI9322_ENTRY_HDIR;
+ if (!ili->conf->flip_vertical)
+ reg |= ILI9322_ENTRY_VDIR;
+ reg |= ILI9322_ENTRY_AUTODETECT;
+ ret = regmap_write(ili->regmap, ILI9322_ENTRY, reg);
+ if (ret) {
+ dev_err(ili->dev, "can't write ENTRY reg (%d)\n", ret);
+ return ret;
+ }
+ dev_info(ili->dev, "display is in %s mode, syncmode %02x\n",
+ ili9322_inputs[ili->input],
+ ili->conf->syncmode);
+
+ dev_info(ili->dev, "initialized display\n");
+
+ return 0;
+}
+
+/*
+ * This power-on sequence if from the datasheet, page 57.
+ */
+static int ili9322_power_on(struct ili9322 *ili)
+{
+ int ret;
+
+ /* Assert RESET */
+ gpiod_set_value(ili->reset_gpio, 1);
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(ili->supplies), ili->supplies);
+ if (ret < 0) {
+ dev_err(ili->dev, "unable to enable regulators\n");
+ return ret;
+ }
+ msleep(20);
+
+ /* De-assert RESET */
+ gpiod_set_value(ili->reset_gpio, 0);
+
+ msleep(10);
+
+ return 0;
+}
+
+static int ili9322_power_off(struct ili9322 *ili)
+{
+ return regulator_bulk_disable(ARRAY_SIZE(ili->supplies), ili->supplies);
+}
+
+static int ili9322_disable(struct drm_panel *panel)
+{
+ struct ili9322 *ili = panel_to_ili9322(panel);
+ int ret;
+
+ ret = regmap_write(ili->regmap, ILI9322_POW_CTRL,
+ ILI9322_POW_CTRL_STANDBY);
+ if (ret) {
+ dev_err(ili->dev, "unable to go to standby mode\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ili9322_unprepare(struct drm_panel *panel)
+{
+ struct ili9322 *ili = panel_to_ili9322(panel);
+
+ return ili9322_power_off(ili);
+}
+
+static int ili9322_prepare(struct drm_panel *panel)
+{
+ struct ili9322 *ili = panel_to_ili9322(panel);
+ int ret;
+
+ ret = ili9322_power_on(ili);
+ if (ret < 0)
+ return ret;
+
+ ret = ili9322_init(panel, ili);
+ if (ret < 0)
+ ili9322_unprepare(panel);
+
+ return ret;
+}
+
+static int ili9322_enable(struct drm_panel *panel)
+{
+ struct ili9322 *ili = panel_to_ili9322(panel);
+ int ret;
+
+ ret = regmap_write(ili->regmap, ILI9322_POW_CTRL,
+ ILI9322_POW_CTRL_DEFAULT);
+ if (ret) {
+ dev_err(ili->dev, "unable to enable panel\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Serial RGB modes */
+static const struct drm_display_mode srgb_320x240_mode = {
+ .clock = 2453500,
+ .hdisplay = 320,
+ .hsync_start = 320 + 359,
+ .hsync_end = 320 + 359 + 1,
+ .htotal = 320 + 359 + 1 + 241,
+ .vdisplay = 240,
+ .vsync_start = 240 + 4,
+ .vsync_end = 240 + 4 + 1,
+ .vtotal = 262,
+ .vrefresh = 60,
+ .flags = 0,
+};
+
+static const struct drm_display_mode srgb_360x240_mode = {
+ .clock = 2700000,
+ .hdisplay = 360,
+ .hsync_start = 360 + 35,
+ .hsync_end = 360 + 35 + 1,
+ .htotal = 360 + 35 + 1 + 241,
+ .vdisplay = 240,
+ .vsync_start = 240 + 21,
+ .vsync_end = 240 + 21 + 1,
+ .vtotal = 262,
+ .vrefresh = 60,
+ .flags = 0,
+};
+
+/* This is the only mode listed for parallel RGB in the datasheet */
+static const struct drm_display_mode prgb_320x240_mode = {
+ .clock = 6400000,
+ .hdisplay = 320,
+ .hsync_start = 320 + 38,
+ .hsync_end = 320 + 38 + 1,
+ .htotal = 320 + 38 + 1 + 50,
+ .vdisplay = 240,
+ .vsync_start = 240 + 4,
+ .vsync_end = 240 + 4 + 1,
+ .vtotal = 262,
+ .vrefresh = 60,
+ .flags = 0,
+};
+
+/* YUV modes */
+static const struct drm_display_mode yuv_640x320_mode = {
+ .clock = 2454000,
+ .hdisplay = 640,
+ .hsync_start = 640 + 252,
+ .hsync_end = 640 + 252 + 1,
+ .htotal = 640 + 252 + 1 + 28,
+ .vdisplay = 320,
+ .vsync_start = 320 + 4,
+ .vsync_end = 320 + 4 + 1,
+ .vtotal = 320 + 4 + 1 + 18,
+ .vrefresh = 60,
+ .flags = 0,
+};
+
+static const struct drm_display_mode yuv_720x360_mode = {
+ .clock = 2700000,
+ .hdisplay = 720,
+ .hsync_start = 720 + 252,
+ .hsync_end = 720 + 252 + 1,
+ .htotal = 720 + 252 + 1 + 24,
+ .vdisplay = 360,
+ .vsync_start = 360 + 4,
+ .vsync_end = 360 + 4 + 1,
+ .vtotal = 360 + 4 + 1 + 18,
+ .vrefresh = 60,
+ .flags = 0,
+};
+
+/* BT.656 VGA mode, 640x480 */
+static const struct drm_display_mode itu_r_bt_656_640_mode = {
+ .clock = 2454000,
+ .hdisplay = 640,
+ .hsync_start = 640 + 3,
+ .hsync_end = 640 + 3 + 1,
+ .htotal = 640 + 3 + 1 + 272,
+ .vdisplay = 480,
+ .vsync_start = 480 + 4,
+ .vsync_end = 480 + 4 + 1,
+ .vtotal = 500,
+ .vrefresh = 60,
+ .flags = 0,
+};
+
+/* BT.656 D1 mode 720x480 */
+static const struct drm_display_mode itu_r_bt_656_720_mode = {
+ .clock = 2700000,
+ .hdisplay = 720,
+ .hsync_start = 720 + 3,
+ .hsync_end = 720 + 3 + 1,
+ .htotal = 720 + 3 + 1 + 272,
+ .vdisplay = 480,
+ .vsync_start = 480 + 4,
+ .vsync_end = 480 + 4 + 1,
+ .vtotal = 500,
+ .vrefresh = 60,
+ .flags = 0,
+};
+
+static int ili9322_get_modes(struct drm_panel *panel)
+{
+ struct drm_connector *connector = panel->connector;
+ struct ili9322 *ili = panel_to_ili9322(panel);
+ struct drm_display_mode *mode;
+
+ strncpy(connector->display_info.name, "ILI9322 TFT LCD driver\0",
+ DRM_DISPLAY_INFO_LEN);
+ connector->display_info.width_mm = ili->conf->width_mm;
+ connector->display_info.height_mm = ili->conf->height_mm;
+
+ switch (ili->input) {
+ case ILI9322_INPUT_SRGB_DUMMY_320X240:
+ mode = drm_mode_duplicate(panel->drm, &srgb_320x240_mode);
+ break;
+ case ILI9322_INPUT_SRGB_DUMMY_360X240:
+ mode = drm_mode_duplicate(panel->drm, &srgb_360x240_mode);
+ break;
+ case ILI9322_INPUT_PRGB_THROUGH:
+ case ILI9322_INPUT_PRGB_ALIGNED:
+ mode = drm_mode_duplicate(panel->drm, &prgb_320x240_mode);
+ break;
+ case ILI9322_INPUT_YUV_640X320_YCBCR:
+ mode = drm_mode_duplicate(panel->drm, &yuv_640x320_mode);
+ break;
+ case ILI9322_INPUT_YUV_720X360_YCBCR:
+ mode = drm_mode_duplicate(panel->drm, &yuv_720x360_mode);
+ break;
+ case ILI9322_INPUT_ITU_R_BT656_720X360_YCBCR:
+ mode = drm_mode_duplicate(panel->drm, &itu_r_bt_656_720_mode);
+ break;
+ case ILI9322_INPUT_ITU_R_BT656_640X320_YCBCR:
+ mode = drm_mode_duplicate(panel->drm, &itu_r_bt_656_640_mode);
+ break;
+ default:
+ mode = NULL;
+ break;
+ }
+ if (!mode) {
+ DRM_ERROR("bad mode or failed to add mode\n");
+ return -EINVAL;
+ }
+ drm_mode_set_name(mode);
+ /*
+ * This is the preferred mode because most people are going
+ * to want to use the display with VGA type graphics.
+ */
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+ /* Set up the polarity */
+ if (ili->conf->hsync_active_high)
+ mode->flags |= DRM_MODE_FLAG_PHSYNC;
+ else
+ mode->flags |= DRM_MODE_FLAG_NHSYNC;
+ if (ili->conf->vsync_active_high)
+ mode->flags |= DRM_MODE_FLAG_PVSYNC;
+ else
+ mode->flags |= DRM_MODE_FLAG_NVSYNC;
+
+ mode->width_mm = ili->conf->width_mm;
+ mode->height_mm = ili->conf->height_mm;
+ drm_mode_probed_add(connector, mode);
+
+ return 1; /* Number of modes */
+}
+
+static const struct drm_panel_funcs ili9322_drm_funcs = {
+ .disable = ili9322_disable,
+ .unprepare = ili9322_unprepare,
+ .prepare = ili9322_prepare,
+ .enable = ili9322_enable,
+ .get_modes = ili9322_get_modes,
+};
+
+static int ili9322_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct ili9322 *ili;
+ const struct regmap_config *regmap_config;
+ u8 gamma;
+ u32 val;
+ int ret;
+ int i;
+
+ ili = devm_kzalloc(dev, sizeof(struct ili9322), GFP_KERNEL);
+ if (!ili)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, ili);
+
+ ili->dev = dev;
+
+ /*
+ * Every new incarnation of this display must have a unique
+ * data entry for the system in this driver.
+ */
+ ili->conf = of_device_get_match_data(dev);
+ if (!ili->conf) {
+ dev_err(dev, "missing device configuration\n");
+ return -ENODEV;
+ }
+
+ val = ili->conf->vreg1out_mv;
+ if (!val) {
+ /* Default HW value, do not touch (should be 4.5V) */
+ ili->vreg1out = U8_MAX;
+ } else {
+ if (val < 3600) {
+ dev_err(dev, "too low VREG1OUT\n");
+ return -EINVAL;
+ }
+ if (val > 6000) {
+ dev_err(dev, "too high VREG1OUT\n");
+ return -EINVAL;
+ }
+ if ((val % 100) != 0) {
+ dev_err(dev, "VREG1OUT is no even 100 microvolt\n");
+ return -EINVAL;
+ }
+ val -= 3600;
+ val /= 100;
+ dev_dbg(dev, "VREG1OUT = 0x%02x\n", val);
+ ili->vreg1out = val;
+ }
+
+ val = ili->conf->vcom_high_percent;
+ if (!val) {
+ /* Default HW value, do not touch (should be 91%) */
+ ili->vcom_high = U8_MAX;
+ } else {
+ if (val < 37) {
+ dev_err(dev, "too low VCOM high\n");
+ return -EINVAL;
+ }
+ if (val > 100) {
+ dev_err(dev, "too high VCOM high\n");
+ return -EINVAL;
+ }
+ val -= 37;
+ dev_dbg(dev, "VCOM high = 0x%02x\n", val);
+ ili->vcom_high = val;
+ }
+
+ val = ili->conf->vcom_amplitude_percent;
+ if (!val) {
+ /* Default HW value, do not touch (should be 114%) */
+ ili->vcom_high = U8_MAX;
+ } else {
+ if (val < 70) {
+ dev_err(dev, "too low VCOM amplitude\n");
+ return -EINVAL;
+ }
+ if (val > 132) {
+ dev_err(dev, "too high VCOM amplitude\n");
+ return -EINVAL;
+ }
+ val -= 70;
+ val >>= 1; /* Increments of 2% */
+ dev_dbg(dev, "VCOM amplitude = 0x%02x\n", val);
+ ili->vcom_amplitude = val;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(ili->gamma); i++) {
+ val = ili->conf->gamma_corr_neg[i];
+ if (val > 15) {
+ dev_err(dev, "negative gamma %u > 15, capping\n", val);
+ val = 15;
+ }
+ gamma = val << 4;
+ val = ili->conf->gamma_corr_pos[i];
+ if (val > 15) {
+ dev_err(dev, "positive gamma %u > 15, capping\n", val);
+ val = 15;
+ }
+ gamma |= val;
+ ili->gamma[i] = gamma;
+ dev_dbg(dev, "gamma V%d: 0x%02x\n", i + 1, gamma);
+ }
+
+ ili->supplies[0].supply = "vcc"; /* 2.7-3.6 V */
+ ili->supplies[1].supply = "iovcc"; /* 1.65-3.6V */
+ ili->supplies[2].supply = "vci"; /* 2.7-3.6V */
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ili->supplies),
+ ili->supplies);
+ if (ret < 0)
+ return ret;
+ ret = regulator_set_voltage(ili->supplies[0].consumer,
+ 2700000, 3600000);
+ if (ret)
+ return ret;
+ ret = regulator_set_voltage(ili->supplies[1].consumer,
+ 1650000, 3600000);
+ if (ret)
+ return ret;
+ ret = regulator_set_voltage(ili->supplies[2].consumer,
+ 2700000, 3600000);
+ if (ret)
+ return ret;
+
+ ili->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ili->reset_gpio)) {
+ dev_err(dev, "failed to get RESET GPIO\n");
+ return PTR_ERR(ili->reset_gpio);
+ }
+
+ spi->bits_per_word = 8;
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ dev_err(dev, "spi setup failed.\n");
+ return ret;
+ }
+ regmap_config = &ili9322_regmap_config;
+ ili->regmap = devm_regmap_init(dev, &ili9322_regmap_bus, dev,
+ regmap_config);
+ if (IS_ERR(ili->regmap)) {
+ dev_err(dev, "failed to allocate register map\n");
+ return PTR_ERR(ili->regmap);
+ }
+
+ ret = regmap_read(ili->regmap, ILI9322_CHIP_ID, &val);
+ if (ret) {
+ dev_err(dev, "can't get chip ID (%d)\n", ret);
+ return ret;
+ }
+ if (val != ILI9322_CHIP_ID_MAGIC) {
+ dev_err(dev, "chip ID 0x%0x2, expected 0x%02x\n", val,
+ ILI9322_CHIP_ID_MAGIC);
+ return -ENODEV;
+ }
+
+ /* Probe the system to find the display setting */
+ if (ili->conf->input == ILI9322_INPUT_UNKNOWN) {
+ ret = regmap_read(ili->regmap, ILI9322_ENTRY, &val);
+ if (ret) {
+ dev_err(dev, "can't get entry setting (%d)\n", ret);
+ return ret;
+ }
+ /* Input enum corresponds to HW setting */
+ ili->input = (val >> 4) & 0x0f;
+ if (ili->input >= ILI9322_INPUT_UNKNOWN)
+ ili->input = ILI9322_INPUT_UNKNOWN;
+ } else {
+ ili->input = ili->conf->input;
+ }
+
+ drm_panel_init(&ili->panel);
+ ili->panel.dev = dev;
+ ili->panel.funcs = &ili9322_drm_funcs;
+
+ return drm_panel_add(&ili->panel);
+}
+
+static int ili9322_remove(struct spi_device *spi)
+{
+ struct ili9322 *ili = spi_get_drvdata(spi);
+
+ ili9322_power_off(ili);
+ drm_panel_remove(&ili->panel);
+
+ return 0;
+}
+
+/*
+ * The D-Link DIR-685 panel is marked LM918A01-1A SY-B4-091116-E0199
+ */
+static const struct ili9322_config ili9322_dir_685 = {
+ .width_mm = 65,
+ .height_mm = 50,
+ .input = ILI9322_INPUT_ITU_R_BT656_640X320_YCBCR,
+ .vreg1out_mv = 4600,
+ .vcom_high_percent = 91,
+ .vcom_amplitude_percent = 114,
+ .syncmode = ILI9322_IF_CTRL_SYNC_DISABLED,
+ .dclk_active_high = true,
+ .gamma_corr_neg = { 0xa, 0x5, 0x7, 0x7, 0x7, 0x5, 0x1, 0x6 },
+ .gamma_corr_pos = { 0x7, 0x7, 0x3, 0x2, 0x3, 0x5, 0x7, 0x2 },
+};
+
+static const struct of_device_id ili9322_of_match[] = {
+ {
+ .compatible = "dlink,dir-685-panel",
+ .data = &ili9322_dir_685,
+ },
+ {
+ .compatible = "ilitek,ili9322",
+ .data = NULL,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ili9322_of_match);
+
+static struct spi_driver ili9322_driver = {
+ .probe = ili9322_probe,
+ .remove = ili9322_remove,
+ .driver = {
+ .name = "panel-ilitek-ili9322",
+ .of_match_table = ili9322_of_match,
+ },
+};
+module_spi_driver(ili9322_driver);
+
+MODULE_AUTHOR("Linus Walleij <linus.wall...@linaro.org>");
+MODULE_DESCRIPTION("ILI9322 LCD panel driver");
+MODULE_LICENSE("GPL v2");
--
2.14.3
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