Re: [PATCH v2 3/3] drm/panel: Add ilitek ili9341 panel driver

Jagan Teki
2021-07-21T15:48:15Z

On Wed, Jul 21, 2021 at 1:11 PM <dillon.minfei@gmail.com> wrote:
>
> From: Dillon Min <dillon.minfei@gmail.com>
>
> This driver combine tiny/ili9341.c mipi_dbi_interface driver
> with mipi_dpi_interface driver, can support ili9341 with serial
> mode or parallel rgb interface mode by register configuration.
>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Dillon Min <dillon.minfei@gmail.com>
> ---
> changes in v2:
> - replace vcc regulator to three bulk regulators(vci, vddi, vddi-led)
> according to linus suggestion, thanks.
>
> drivers/gpu/drm/panel/Kconfig | 12 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 778 +++++++++++++++++++++++++++
> 3 files changed, 791 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index ef87d92cdf49..eb34b8d1b19a 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -124,6 +124,18 @@ config DRM_PANEL_ILITEK_IL9322
> 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_ILITEK_ILI9341
> + tristate "Ilitek ILI9341 240x320 QVGA panels"
> + depends on OF && SPI
> + depends on DRM_KMS_HELPER
> + depends on DRM_KMS_CMA_HELPER
> + depends on BACKLIGHT_CLASS_DEVICE
> + select DRM_MIPI_DBI
> + help
> + Say Y here if you want to enable support for Ilitek IL9341
> + QVGA (240x320) RGB panels. support serial & parallel rgb
> + interface.
> +
> config DRM_PANEL_ILITEK_ILI9881C
> tristate "Ilitek ILI9881C-based panels"
> depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index cae4d976c069..0ecde184665d 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_DRM_PANEL_ELIDA_KD35T133) += panel-elida-kd35t133.o
> obj-$(CONFIG_DRM_PANEL_FEIXIN_K101_IM2BA02) += panel-feixin-k101-im2ba02.o
> obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o
> obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
> +obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9341) += panel-ilitek-ili9341.o
> obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
> obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
> obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
> diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> new file mode 100644
> index 000000000000..717b0b930e2f
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> @@ -0,0 +1,778 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Ilitek ILI9341 TFT LCD drm_panel driver.
> + *
> + * This panel can be configured to support:
> + * - 16-bit parallel RGB interface
> + * - 18-bit parallel RGB interface
> + * - 4-line serial spi interface
> + *
> + * Copyright (C) 2021 Dillon Min <dillon.minfei@gmail.com>
> + * Derived from drivers/drm/gpu/panel/panel-ilitek-ili9322.c
> + * the reuse of DBI abstraction part referred from Linus's patch
> + * "drm/panel: s6e63m0: Switch to DBI abstraction for SPI"
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/spi/spi.h>
> +#include <linux/delay.h>
> +#include <video/mipi_display.h>
> +#include <drm/drm_mipi_dbi.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_gem_atomic_helper.h>
> +
> +#include <drm/drm_drv.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_print.h>
> +
> +#define ILI9341_RGB_INTERFACE 0xb0 /* RGB Interface Signal Control */
> +#define ILI9341_FRC 0xb1 /* Frame Rate Control register */
> +#define ILI9341_DFC 0xb6 /* Display Function Control register */
> +#define ILI9341_POWER1 0xc0 /* Power Control 1 register */
> +#define ILI9341_POWER2 0xc1 /* Power Control 2 register */
> +#define ILI9341_VCOM1 0xc5 /* VCOM Control 1 register */
> +#define ILI9341_VCOM2 0xc7 /* VCOM Control 2 register */
> +#define ILI9341_POWERA 0xcb /* Power control A register */
> +#define ILI9341_POWERB 0xcf /* Power control B register */
> +#define ILI9341_PGAMMA 0xe0 /* Positive Gamma Correction register */
> +#define ILI9341_NGAMMA 0xe1 /* Negative Gamma Correction register */
> +#define ILI9341_DTCA 0xe8 /* Driver timing control A */
> +#define ILI9341_DTCB 0xea /* Driver timing control B */
> +#define ILI9341_POWER_SEQ 0xed /* Power on sequence register */
> +#define ILI9341_3GAMMA_EN 0xf2 /* 3 Gamma enable register */
> +#define ILI9341_INTERFACE 0xf6 /* Interface control register */
> +#define ILI9341_PRC 0xf7 /* Pump ratio control register */
> +#define ILI9341_ETMOD 0xb7 /* Entry mode set */
> +
> +#define ILI9341_MADCTL_BGR BIT(3)
> +#define ILI9341_MADCTL_MV BIT(5)
> +#define ILI9341_MADCTL_MX BIT(6)
> +#define ILI9341_MADCTL_MY BIT(7)
> +
> +#define ILI9341_POWER_B_LEN 3
> +#define ILI9341_POWER_SEQ_LEN 4
> +#define ILI9341_DTCA_LEN 3
> +#define ILI9341_DTCB_LEN 2
> +#define ILI9341_POWER_A_LEN 5
> +#define ILI9341_DFC_1_LEN 2
> +#define ILI9341_FRC_LEN 2
> +#define ILI9341_VCOM_1_LEN 2
> +#define ILI9341_DFC_2_LEN 4
> +#define ILI9341_COLUMN_ADDR_LEN 4
> +#define ILI9341_PAGE_ADDR_LEN 4
> +#define ILI9341_INTERFACE_LEN 3
> +#define ILI9341_PGAMMA_LEN 15
> +#define ILI9341_NGAMMA_LEN 15
> +#define ILI9341_CA_LEN 3
> +
> +#define ILI9341_PIXEL_DPI_16_BITS (BIT(6) | BIT(4))
> +#define ILI9341_PIXEL_DPI_18_BITS (BIT(6) | BIT(5))
> +#define ILI9341_GAMMA_CURVE_1 BIT(0)
> +#define ILI9341_IF_WE_MODE BIT(0)
> +#define ILI9341_IF_BIG_ENDIAN 0x00
> +#define ILI9341_IF_DM_RGB BIT(2)
> +#define ILI9341_IF_DM_INTERNAL 0x00
> +#define ILI9341_IF_DM_VSYNC BIT(3)
> +#define ILI9341_IF_RM_RGB BIT(1)
> +#define ILI9341_IF_RIM_RGB 0x00
> +
> +#define ILI9341_COLUMN_ADDR 0x00ef
> +#define ILI9341_PAGE_ADDR 0x013f
> +
> +#define ILI9341_RGB_EPL BIT(0)
> +#define ILI9341_RGB_DPL BIT(1)
> +#define ILI9341_RGB_HSPL BIT(2)
> +#define ILI9341_RGB_VSPL BIT(3)
> +#define ILI9341_RGB_DE_MODE BIT(6)
> +#define ILI9341_RGB_DISP_PATH_MEM BIT(7)
> +
> +#define ILI9341_DBI_VCOMH_4P6V 0x23
> +#define ILI9341_DBI_PWR_2_DEFAULT 0x10
> +#define ILI9341_DBI_PRC_NORMAL 0x20
> +#define ILI9341_DBI_VCOM_1_VMH_4P25V 0x3e
> +#define ILI9341_DBI_VCOM_1_VML_1P5V 0x28
> +#define ILI9341_DBI_VCOM_2_DEC_58 0x86
> +#define ILI9341_DBI_FRC_DIVA 0x00
> +#define ILI9341_DBI_FRC_RTNA 0x1b
> +#define ILI9341_DBI_EMS_GAS BIT(0)
> +#define ILI9341_DBI_EMS_DTS BIT(1)
> +#define ILI9341_DBI_EMS_GON BIT(2)
> +
> +/**
> + * struct ili9341_config - the system specific ILI9341 configuration
> + * @max_spi_speed: 10000000
> + */
> +struct ili9341_config {
> + u32 max_spi_speed;
> + /** @mode: the drm display mode */
> + const struct drm_display_mode mode;
> + /** @ca: TODO: need comments for this register */
> + u8 ca[ILI9341_CA_LEN];
> + /** @power_b: TODO: need comments for this register */
> + u8 power_b[ILI9341_POWER_B_LEN];
> + /** @power_seq: TODO: need comments for this register */
> + u8 power_seq[ILI9341_POWER_SEQ_LEN];
> + /** @dtca: TODO: need comments for this register */
> + u8 dtca[ILI9341_DTCA_LEN];
> + /** @dtcb: TODO: need comments for this register */
> + u8 dtcb[ILI9341_DTCB_LEN];
> + /** @power_a: TODO: need comments for this register */
> + u8 power_a[ILI9341_POWER_A_LEN];
> + /** @frc: Frame Rate Control (In Normal Mode/Full Colors) (B1h) */
> + u8 frc[ILI9341_FRC_LEN];
> + /** @prc: TODO: need comments for this register */
> + u8 prc;
> + /** @dfc_1: B6h DISCTRL (Display Function Control) */
> + u8 dfc_1[ILI9341_DFC_1_LEN];
> + /** @power_1: Power Control 1 (C0h) */
> + u8 power_1;
> + /** @power_2: Power Control 2 (C1h) */
> + u8 power_2;
> + /** @vcom_1: VCOM Control 1(C5h) */
> + u8 vcom_1[ILI9341_VCOM_1_LEN];
> + /** @vcom_2: VCOM Control 2(C7h) */
> + u8 vcom_2;
> + /** @address_mode: Memory Access Control (36h) */
> + u8 address_mode;
> + /** @g3amma_en: TODO: need comments for this register */
> + u8 g3amma_en;
> + /** @rgb_interface: RGB Interface Signal Control (B0h) */
> + u8 rgb_interface;
> + /** @dfc_2: refer to dfc_1 */
> + u8 dfc_2[ILI9341_DFC_2_LEN];
> + /** @column_addr: Column Address Set (2Ah) */
> + u8 column_addr[ILI9341_COLUMN_ADDR_LEN];
> + /** @page_addr: Page Address Set (2Bh) */
> + u8 page_addr[ILI9341_PAGE_ADDR_LEN];
> + /** @interface: Interface Control (F6h) */
> + u8 interface[ILI9341_INTERFACE_LEN];
> + /** @pixel_format: This command sets the pixel format for the RGB */
> + /* image data used by
> + */
> + u8 pixel_format;
> + /** @gamma_curve: This command is used to select the desired Gamma */
> + /* curve for the
> + */
> + u8 gamma_curve;
> + /** @pgamma: Positive Gamma Correction (E0h) */
> + u8 pgamma[ILI9341_PGAMMA_LEN];
> + /** @ngamma: Negative Gamma Correction (E1h) */
> + u8 ngamma[ILI9341_NGAMMA_LEN];
> +};
> +
> +struct ili9341 {
> + struct device *dev;
> + const struct ili9341_config *conf;
> + struct drm_panel panel;
> + struct gpio_desc *reset_gpio;
> + struct gpio_desc *dc_gpio;
> + struct mipi_dbi *dbi;
> + u32 max_spi_speed;
> + struct regulator_bulk_data supplies[3];
> +};
> +
> +/*
> + * The Stm32f429-disco board has a panel ili9341 connected to ltdc controller
> + */
> +static const struct ili9341_config ili9341_stm32f429_disco_data = {
> + .max_spi_speed = 10000000,
> + .mode = {
> + .clock = 6100,
> + .hdisplay = 240,
> + .hsync_start = 240 + 10,/* hfp 10 */
> + .hsync_end = 240 + 10 + 10,/* hsync 10 */
> + .htotal = 240 + 10 + 10 + 20,/* hbp 20 */
> + .vdisplay = 320,
> + .vsync_start = 320 + 4,/* vfp 4 */
> + .vsync_end = 320 + 4 + 2,/* vsync 2 */
> + .vtotal = 320 + 4 + 2 + 2,/* vbp 2 */
> + .flags = 0,
> + .width_mm = 65,
> + .height_mm = 50,
> + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> + },
> + .ca = {0xc3, 0x08, 0x50},
> + .power_b = {0x00, 0xc1, 0x30},
> + .power_seq = {0x64, 0x03, 0x12, 0x81},
> + .dtca = {0x85, 0x00, 0x78},
> + .power_a = {0x39, 0x2c, 0x00, 0x34, 0x02},
> + .prc = 0x20,
> + .dtcb = {0x00, 0x00},
> + /* 0x00 fosc, 0x1b 70hz */
> + .frc = {0x00, 0x1b},
> + /* 0x0a Interval scan, AGND AGND AGND AGND
> + * 0xa2 Normally white, G1 -> G320, S720 -> S1,
> + * Scan Cycle 5 frames,85ms
> + */
> + .dfc_1 = {0x0a, 0xa2},
> + /* 0x10 3.65v */
> + .power_1 = 0x10,
> + /* 0x10 AVDD=vci*2, VGH=vci*7, VGL=-vci*4 */
> + .power_2 = 0x10,
> + /* 0x45 VCOMH 4.425v, 0x15 VCOML -1.975*/
> + .vcom_1 = {0x45, 0x15},
> + /* 0x90 offset voltage, VMH-48, VML-48 */
> + .vcom_2 = 0x90,
> + /* 0xc8 Row Address Order, Column Address Order
> + * BGR 1
> + */
> + .address_mode = 0xc8,
> + .g3amma_en = 0x00,
> + /* 0xc2
> + * Display Data Path: Memory
> + * RGB: DE mode
> + * DOTCLK polarity set (data fetched at the falling time)
> + */
> + .rgb_interface = ILI9341_RGB_DISP_PATH_MEM |
> + ILI9341_RGB_DE_MODE |
> + ILI9341_RGB_DPL,
> + /*
> + * 0x0a
> + * Gate outputs in non-display area: Interval scan
> + * Determine source/VCOM output in a non-display area in the partial
> + * display mode: AGND AGND AGND AGND
> + *
> + * 0xa7
> + * Scan Cycle: 15 frames
> + * fFLM = 60Hz: 255ms
> + * Liquid crystal type: Normally white
> + * Gate Output Scan Direction: G1 -> G320
> + * Source Output Scan Direction: S720 -> S1
> + *
> + * 0x27
> + * LCD Driver Line: 320 lines
> + *
> + * 0x04
> + * PCDIV: 4
> + */
> + .dfc_2 = {0x0a, 0xa7, 0x27, 0x04},
> + /* column address: 240 */
> + .column_addr = {0x00, 0x00, (ILI9341_COLUMN_ADDR >> 4) & 0xff,
> + ILI9341_COLUMN_ADDR & 0xff},
> + /* page address: 320 */
> + .page_addr = {0x00, 0x00, (ILI9341_PAGE_ADDR >> 4) & 0xff,
> + ILI9341_PAGE_ADDR & 0xff},
> + /* Memory write control: When the transfer number of data exceeds
> + * (EC-SC+1)*(EP-SP+1), the column and page number will be
> + * reset, and the exceeding data will be written into the following
> + * column and page.
> + * Display Operation Mode: RGB Interface Mode
> + * Interface for RAM Access: RGB interface
> + * 16- bit RGB interface (1 transfer/pixel)
> + */
> + .interface = {ILI9341_IF_WE_MODE, 0x00,
> + ILI9341_IF_DM_RGB | ILI9341_IF_RM_RGB},
> + /* DPI: 16 bits / pixel */
> + .pixel_format = ILI9341_PIXEL_DPI_16_BITS,
> + /* Curve Selected: Gamma curve 1 (G2.2) */
> + .gamma_curve = ILI9341_GAMMA_CURVE_1,
> + .pgamma = {0x0f, 0x29, 0x24, 0x0c, 0x0e,
> + 0x09, 0x4e, 0x78, 0x3c, 0x09,
> + 0x13, 0x05, 0x17, 0x11, 0x00},
> + .ngamma = {0x00, 0x16, 0x1b, 0x04, 0x11,
> + 0x07, 0x31, 0x33, 0x42, 0x05,
> + 0x0c, 0x0a, 0x28, 0x2f, 0x0f},
> +};
> +
> +static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
> +{
> + return container_of(panel, struct ili9341, panel);
> +}
> +
> +static void ili9341_dpi_init(struct ili9341 *ili)
> +{
> + struct mipi_dbi *dbi = ili->dbi;
> + struct ili9341_config *cfg = (struct ili9341_config *)ili->conf;
> +
> + /* Power Control */
> + mipi_dbi_command_stackbuf(dbi, 0xca, cfg->ca, ILI9341_CA_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_POWERB, cfg->power_b,
> + ILI9341_POWER_B_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_POWER_SEQ, cfg->power_seq,
> + ILI9341_POWER_SEQ_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_DTCA, cfg->dtca,
> + ILI9341_DTCA_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_POWERA, cfg->power_a,
> + ILI9341_POWER_A_LEN);
> + mipi_dbi_command(ili->dbi, ILI9341_PRC, cfg->prc);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_DTCB, cfg->dtcb,
> + ILI9341_DTCB_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_FRC, cfg->frc, ILI9341_FRC_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_DFC, cfg->dfc_1,
> + ILI9341_DFC_1_LEN);
> + mipi_dbi_command(dbi, ILI9341_POWER1, cfg->power_1);
> + mipi_dbi_command(dbi, ILI9341_POWER2, cfg->power_2);
> +
> + /* VCOM */
> + mipi_dbi_command_stackbuf(dbi, ILI9341_VCOM1, cfg->vcom_1,
> + ILI9341_VCOM_1_LEN);
> + mipi_dbi_command(dbi, ILI9341_VCOM2, cfg->vcom_2);
> + mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, cfg->address_mode);
> +
> + /* Gamma */
> + mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, cfg->g3amma_en);
> + mipi_dbi_command(dbi, ILI9341_RGB_INTERFACE, cfg->rgb_interface);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_DFC, cfg->dfc_2,
> + ILI9341_DFC_2_LEN);
> +
> + /* Colomn address set */
> + mipi_dbi_command_stackbuf(dbi, MIPI_DCS_SET_COLUMN_ADDRESS,
> + cfg->column_addr, ILI9341_COLUMN_ADDR_LEN);
> +
> + /* Page address set */
> + mipi_dbi_command_stackbuf(dbi, MIPI_DCS_SET_PAGE_ADDRESS,
> + cfg->page_addr, ILI9341_PAGE_ADDR_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_INTERFACE, cfg->interface,
> + ILI9341_INTERFACE_LEN);
> +
> + /* Format */
> + mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, cfg->pixel_format);
> + mipi_dbi_command(dbi, MIPI_DCS_WRITE_MEMORY_START);
> + msleep(200);
> + mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, cfg->gamma_curve);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_PGAMMA, cfg->pgamma,
> + ILI9341_PGAMMA_LEN);
> + mipi_dbi_command_stackbuf(dbi, ILI9341_NGAMMA, cfg->ngamma,
> + ILI9341_NGAMMA_LEN);
> + mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
> + msleep(200);
> + mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
> + mipi_dbi_command(dbi, MIPI_DCS_WRITE_MEMORY_START);
> +
> + dev_info(ili->dev, "initialized display rgb interface\n");
> +}
> +
> +static int ili9341_dpi_power_on(struct ili9341 *ili)
> +{
> + int ret = 0;
> +
> + /* Assert RESET */
> + gpiod_set_value(ili->reset_gpio, 1);
> +
> + /* Enable power */
> + ret = regulator_bulk_enable(ARRAY_SIZE(ili->supplies),
> + ili->supplies);
> + if (ret < 0) {
> + dev_err(ili->dev, "unable to enable vcc\n");
> + return ret;
> + }
> + msleep(20);
> +
> + /* De-assert RESET */
> + gpiod_set_value(ili->reset_gpio, 0);
> + msleep(20);
> +
> + return 0;
> +}
> +
> +static int ili9341_dpi_power_off(struct ili9341 *ili)
> +{
> + /* Assert RESET */
> + gpiod_set_value(ili->reset_gpio, 1);
> +
> + /* Disable power */
> + return regulator_bulk_disable(ARRAY_SIZE(ili->supplies),
> + ili->supplies);
> +}
> +
> +static int ili9341_dpi_disable(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> +
> + mipi_dbi_command(ili->dbi, MIPI_DCS_SET_DISPLAY_OFF);
> + return 0;
> +}
> +
> +static int ili9341_dpi_unprepare(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> +
> + return ili9341_dpi_power_off(ili);
> +}
> +
> +static int ili9341_dpi_prepare(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> + int ret;
> +
> + ret = ili9341_dpi_power_on(ili);
> + if (ret < 0)
> + return ret;
> +
> + ili9341_dpi_init(ili);
> +
> + return ret;
> +}
> +
> +static int ili9341_dpi_enable(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> +
> + mipi_dbi_command(ili->dbi, MIPI_DCS_SET_DISPLAY_ON);
> + return 0;
> +}
> +
> +static int ili9341_dpi_get_modes(struct drm_panel *panel,
> + struct drm_connector *connector)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> + struct drm_device *drm = connector->dev;
> + struct drm_display_mode *mode;
> + struct drm_display_info *info;
> +
> + info = &connector->display_info;
> + info->width_mm = ili->conf->mode.width_mm;
> + info->height_mm = ili->conf->mode.height_mm;
> +
> + if (ili->conf->rgb_interface & ILI9341_RGB_DPL)
> + info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
> + else
> + info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
> +
> + if (ili->conf->rgb_interface & ILI9341_RGB_EPL)
> + info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
> + else
> + info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;
> +
> + mode = drm_mode_duplicate(drm, &ili->conf->mode);
> + if (!mode) {
> + DRM_ERROR("bad mode or failed to add mode\n");
> + return -EINVAL;
> + }
> + drm_mode_set_name(mode);
> +
> + /* Set up the polarity */
> + if (ili->conf->rgb_interface & ILI9341_RGB_HSPL)
> + mode->flags |= DRM_MODE_FLAG_PHSYNC;
> + else
> + mode->flags |= DRM_MODE_FLAG_NHSYNC;
> +
> + if (ili->conf->rgb_interface & ILI9341_RGB_VSPL)
> + mode->flags |= DRM_MODE_FLAG_PVSYNC;
> + else
> + mode->flags |= DRM_MODE_FLAG_NVSYNC;
> +
> + drm_mode_probed_add(connector, mode);
> +
> + return 1; /* Number of modes */
> +}
> +
> +static const struct drm_panel_funcs ili9341_dpi_funcs = {
> + .disable = ili9341_dpi_disable,
> + .unprepare = ili9341_dpi_unprepare,
> + .prepare = ili9341_dpi_prepare,
> + .enable = ili9341_dpi_enable,
> + .get_modes = ili9341_dpi_get_modes,
> +};
> +
> +static void ili9341_dbi_enable(struct drm_simple_display_pipe *pipe,
> + struct drm_crtc_state *crtc_state,
> + struct drm_plane_state *plane_state)
> +{
> + struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
> + struct mipi_dbi *dbi = &dbidev->dbi;
> + u8 addr_mode;
> + int ret, idx;
> +
> + if (!drm_dev_enter(pipe->crtc.dev, &idx))
> + return;
> +
> + DRM_DEBUG_KMS("\n");
> +
> + ret = mipi_dbi_poweron_conditional_reset(dbidev);
> + if (ret < 0)
> + goto out_exit;
> + if (ret == 1)
> + goto out_enable;
> +
> + mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
> +
> + mipi_dbi_command(dbi, ILI9341_POWERB, 0x00, 0xc1, 0x30);
> + mipi_dbi_command(dbi, ILI9341_POWER_SEQ, 0x64, 0x03, 0x12, 0x81);
> + mipi_dbi_command(dbi, ILI9341_DTCA, 0x85, 0x00, 0x78);
> + mipi_dbi_command(dbi, ILI9341_POWERA, 0x39, 0x2c, 0x00, 0x34, 0x02);
> + mipi_dbi_command(dbi, ILI9341_PRC, ILI9341_DBI_PRC_NORMAL);
> + mipi_dbi_command(dbi, ILI9341_DTCB, 0x00, 0x00);
> +
> + /* Power Control */
> + mipi_dbi_command(dbi, ILI9341_POWER1, ILI9341_DBI_VCOMH_4P6V);
> + mipi_dbi_command(dbi, ILI9341_POWER2, ILI9341_DBI_PWR_2_DEFAULT);
> + /* VCOM */
> + mipi_dbi_command(dbi, ILI9341_VCOM1, ILI9341_DBI_VCOM_1_VMH_4P25V,
> + ILI9341_DBI_VCOM_1_VML_1P5V);
> + mipi_dbi_command(dbi, ILI9341_VCOM2, ILI9341_DBI_VCOM_2_DEC_58);
> +
> + /* Memory Access Control */
> + mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
> + MIPI_DCS_PIXEL_FMT_16BIT);
> +
> + /* Frame Rate */
> + mipi_dbi_command(dbi, ILI9341_FRC, ILI9341_DBI_FRC_DIVA & 0x03,
> + ILI9341_DBI_FRC_RTNA & 0x1f);
> +
> + /* Gamma */
> + mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, 0x00);
> + mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, ILI9341_GAMMA_CURVE_1);
> + mipi_dbi_command(dbi, ILI9341_PGAMMA,
> + 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
> + 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
> + mipi_dbi_command(dbi, ILI9341_NGAMMA,
> + 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
> + 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
> +
> + /* DDRAM */
> + mipi_dbi_command(dbi, ILI9341_ETMOD, ILI9341_DBI_EMS_GAS |
> + ILI9341_DBI_EMS_DTS |
> + ILI9341_DBI_EMS_GON);
> +
> + /* Display */
> + mipi_dbi_command(dbi, ILI9341_DFC, 0x08, 0x82, 0x27, 0x00);
> + mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
> + msleep(100);
> +
> + mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
> + msleep(100);
> +
> +out_enable:
> + switch (dbidev->rotation) {
> + default:
> + addr_mode = ILI9341_MADCTL_MX;
> + break;
> + case 90:
> + addr_mode = ILI9341_MADCTL_MV;
> + break;
> + case 180:
> + addr_mode = ILI9341_MADCTL_MY;
> + break;
> + case 270:
> + addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
> + ILI9341_MADCTL_MX;
> + break;
> + }
> + addr_mode |= ILI9341_MADCTL_BGR;
> + mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
> + mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
> + DRM_DEBUG_KMS("initialized display serial interface\n");
> +out_exit:
> + drm_dev_exit(idx);
> +}
> +
> +static const struct drm_simple_display_pipe_funcs ili9341_dbi_funcs = {
> + .enable = ili9341_dbi_enable,
> + .disable = mipi_dbi_pipe_disable,
> + .update = mipi_dbi_pipe_update,
> + .prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
> +};
> +
> +static const struct drm_display_mode ili9341_dbi_mode = {
> + DRM_SIMPLE_MODE(240, 320, 37, 49),
> +};
> +
> +DEFINE_DRM_GEM_CMA_FOPS(ili9341_dbi_fops);
> +
> +static struct drm_driver ili9341_dbi_driver = {
> + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> + .fops = &ili9341_dbi_fops,
> + DRM_GEM_CMA_DRIVER_OPS_VMAP,
> + .debugfs_init = mipi_dbi_debugfs_init,
> + .name = "ili9341",
> + .desc = "Ilitek ILI9341",
> + .date = "20210716",
> + .major = 1,
> + .minor = 0,
> +};
> +
> +static int _ili9341_probe(struct spi_device *spi, bool dpi)
> +{
> + struct gpio_desc *dc;
> + struct gpio_desc *reset;
> + struct device *dev = &spi->dev;
> + int ret;
> +
> + reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(reset))
> + DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
> +
> + dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
> + if (IS_ERR(dc))
> + DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");

Small nit. Moving the above dts parse code into the main probe and
have functions for dpi and !dpi would make code more readable.

Otherwise,
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>