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Subject: Re: [PATCH 1/4] drm/panel: Add ilitek ili9341 panel driver
To:     <dillon.minfei@gmail.com>, <pierre-yves.mordret@foss.st.com>,
        <alain.volmat@foss.st.com>, <mcoquelin.stm32@gmail.com>,
        <alexandre.torgue@foss.st.com>, <sumit.semwal@linaro.org>,
        <christian.koenig@amd.com>, <mturquette@baylibre.com>
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References: <1620990152-19255-1-git-send-email-dillon.minfei@gmail.com>
 <1620990152-19255-2-git-send-email-dillon.minfei@gmail.com>
From:   Patrice CHOTARD <patrice.chotard@foss.st.com>
Message-ID: <56b41c37-147b-bf89-c840-2c5f08863a36@foss.st.com>
Date:   Mon, 31 May 2021 15:15:08 +0200
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Hi Dillon

When trying to applying this patch using "git am --3 <patch>"  i got this error :

error: cannot convert from y to UTF-8
fatal: could not parse patch

Whereas i got no similar error with the other patch 2/3 and 4.

I find a way to apply it anyway.

Patrice


On 5/14/21 1:02 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.
> 
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Link: https://lore.kernel.org/lkml/1590378348-8115-7-git-send-email-dillon.minfei@gmail.com/
> Signed-off-by: Dillon Min <dillon.minfei@gmail.com>
> ---
>  drivers/gpu/drm/panel/Kconfig                |   12 +
>  drivers/gpu/drm/panel/Makefile               |    1 +
>  drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 1285 ++++++++++++++++++++++++++
>  3 files changed, 1298 insertions(+)
>  create mode 100755 drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 4894913936e9..e4babba17864 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -123,6 +123,18 @@ 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..f84983cbb250
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> @@ -0,0 +1,1285 @@
> +// 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) 2020 Dillon Min <dillon.minfei@gmail.com>
> + * Derived from drivers/drm/gpu/panel/panel-ilitek-ili9322.c
> + */
> +
> +#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_gem_atomic_helper.h>
> +#include <drm/drm_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)
> +/**
> + * ili9341_command - ili9341 command with optional parameter(s)
> + * @ili: struct ili9341
> + * @cmd: Command
> + * @seq...: Optional parameter(s)
> + *
> + * Send command to the controller.
> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +#define ili9341_command(ili, cmd, seq...) \
> +({ \
> +	u8 d[] = { seq }; \
> +	_ili9341_command(ili, cmd, d, ARRAY_SIZE(d)); \
> +})
> +
> +/**
> + * 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) */
> +	/*
> +	 * Formula to calculate frame frequency:
> +	 * Frame Rate=fosc/(Clocks per line x Division ratio x
> +	 * (Lines+VBP+VFP))
> +	 *
> +	 * Sets the division ratio for internal clocks of Normal mode at MCU
> +	 * interface.
> +	 *
> +	 * fosc : internal oscillator frequency
> +	 * Clocks per line : RTNA setting
> +	 * Division ratio : DIVA setting
> +	 * Lines : total driving line number
> +	 * VBP : back porch line number
> +	 * VFP : front porch line number
> +	 *
> +	 * RTNA [4:0] Frame Rate (Hz)   RTNA [4:0] Frame Rate (Hz)
> +	 * 1 0 0 0 0  119		1 1 0 0 0  79
> +	 * 1 0 0 0 1  112		1 1 0 0 1  76
> +	 * 1 0 0 1 0  106		1 1 0 1 0  73
> +	 * 1 0 0 1 1  100		1 1 0 1 1  70(default)
> +	 * 1 0 1 0 0  95		1 1 1 0 0  68
> +	 * 1 0 1 0 1  90		1 1 1 0 1  65
> +	 * 1 0 1 1 0  86		1 1 1 0 1  63
> +	 * 1 0 1 1 1  83		1 1 1 1 1  61
> +	 *
> +	 * DIVA [1:0] : division ratio for internal clocks when Normal mode.
> +	 *
> +	 * DIVA [1:0] Division Ratio
> +	 * 0 0 fosc
> +	 * 0 1 fosc / 2
> +	 * 1 0 fosc / 4
> +	 * 1 1 fosc / 8
> +	 *
> +	 */
> +	u8 frc[ILI9341_FRC_LEN];
> +	/** @prc: TODO: need comments for this register */
> +	u8 prc;
> +	/** @dfc_1: B6h DISCTRL (Display Function Control) */
> +	/*               D/CX RDX WRX D17-8 D7  D6 D5 D4 D3   D2  D1  D0  HEX
> +	 * Command       0    1   M   XX    1   0  1  1  0    1   1   0   B6h
> +	 * 1st Parameter 1    1   M   XX    0   0  0  0  PTG[1:0] PT[1:0] 0A
> +	 * 2nd Parameter 1    1   M   XX    REV GS SS SM ISC[3:0]         82
> +	 * 3rd Parameter 1    1   M   XX    0   0  NL[5:0]                27
> +	 * 4th Parameter 1    1   M   XX    0   0  PCDIV[5:0]             XX
> +	 *
> +	 * PTG [1:0]: Set the scan mode in non-display area.
> +	 * PTG1 | PTG0 | Gate outputs in   | Source outputs in  | VCOM output
> +	 *               non-display area  | non-display area   |
> +	 * 1      0      Interval scan       Set with the PT[2:0] bits
> +	 *
> +	 * PT [1:0]: Determine source/VCOM output in a non-display area in the
> +	 * partial display mode.
> +	 * 1    0    AGND       AGND       AGND         AGND
> +	 *
> +	 * REV: Select whether the liquid crystal type is normally white type
> +	 * or normally black type.
> +	 * REV   Liquid crystal type
> +	 * 0     Normally black
> +	 * 1     Normally white
> +	 *
> +	 * SS: Select the shift direction of outputs from the source driver.
> +	 * SS    Source Output Scan Direction
> +	 * 0     S1 -> S720
> +	 * 1     S720 -> S1
> +	 *
> +	 * GS: Sets the direction of scan by the gate driver in the range
> +	 * determined by SCN [4:0] and NL [4:0]. The scan direction
> +	 * determined by GS = 0 can be reversed by setting GS = 1.
> +	 *
> +	 * GS     Gate Output Scan Direction
> +	 * 0      G1 -> G320
> +	 * 1      G320 -> G1
> +	 */
> +	u8 dfc_1[ILI9341_DFC_1_LEN];
> +	 /** @power_1: Power Control 1 (C0h) */
> +	 /* VRH [5:0]: Set the GVDD level, which is a reference level for the
> +	 * VCOM level and the grayscale voltage level.
> +	 *
> +	 * VRH[5:0]    GVDD			VRH[5:0]	GVDD
> +	 * 0 0 0 0 0 0 Setting prohibited	1 0 0 0 0 0	4.45 V
> +	 * 0 0 0 0 0 1 Setting prohibited	1 0 0 0 0 1	4.50 V
> +	 * 0 0 0 0 1 0 Setting prohibited	1 0 0 0 1 0	4.55 V
> +	 * 0 0 0 0 1 1 3.00 V			1 0 0 0 1 1	4.60 V
> +	 * 0 0 0 1 0 0 3.05 V			1 0 0 1 0 0	4.65 V
> +	 * 0 0 0 1 0 1 3.10 V			1 0 0 1 0 1	4.70 V
> +	 * 0 0 0 1 1 0 3.15 V			1 0 0 1 1 0	4.75 V
> +	 * 0 0 0 1 1 1 3.20 V			1 0 0 1 1 1	4.80 V
> +	 * 0 0 1 0 0 0 3.25 V			1 0 1 0 0 0	4.85 V
> +	 * 0 0 1 0 0 1 3.30 V			1 0 1 0 0 1	4.90 V
> +	 * 0 0 1 0 1 0 3.35 V			1 0 1 0 1 0	4.95 V
> +	 * 0 0 1 0 1 1 3.40 V			1 0 1 0 1 1	5.00 V
> +	 * 0 0 1 1 0 0 3.45 V			1 0 1 1 0 0	5.05 V
> +	 * 0 0 1 1 0 1 3.50 V			1 0 1 1 0 1	5.10 V
> +	 * 0 0 1 1 1 0 3.55 V			1 0 1 1 1 0	5.15 V
> +	 * 0 0 1 1 1 1 3.60 V			1 0 1 1 1 1	5.20 V
> +	 * 0 1 0 0 0 0 3.65 V			1 1 0 0 0 0	5.25 V
> +	 * 0 1 0 0 0 1 3.70 V			1 1 0 0 0 1	5.30 V
> +	 * 0 1 0 0 1 0 3.75 V			1 1 0 0 1 0	5.35 V
> +	 * 0 1 0 0 1 1 3.80 V			1 1 0 0 1 1	5.40 V
> +	 * 0 1 0 1 0 0 3.85 V			1 1 0 1 0 0	5.45 V
> +	 * 0 1 0 1 0 1 3.90 V			1 1 0 1 0 1	5.50 V
> +	 * 0 1 0 1 1 0 3.95 V			1 1 0 1 1 0	5.55 V
> +	 * 0 1 0 1 1 1 4.00 V			1 1 0 1 1 1	5.60 V
> +	 * 0 1 1 0 0 0 4.05 V			1 1 1 0 0 0	5.65 V
> +	 * 0 1 1 0 0 1 4.10 V			1 1 1 0 0 1	5.70 V
> +	 * 0 1 1 0 1 0 4.15 V			1 1 1 0 1 0	5.75 V
> +	 * 0 1 1 0 1 1 4.20 V			1 1 1 0 1 1	5.80 V
> +	 * 0 1 1 1 0 0 4.25 V			1 1 1 1 0 0	5.85 V
> +	 * 0 1 1 1 0 1 4.30 V			1 1 1 1 0 1	5.90 V
> +	 * 0 1 1 1 1 0 4.35 V			1 1 1 1 1 0	5.95 V
> +	 * 0 1 1 1 1 1 4.40 V			1 1 1 1 1 1	6.00 V
> +	 */
> +	u8 power_1;
> +	/** @power_2: Power Control 2 (C1h) */
> +	/*
> +	 * BT [2:0]: Sets the factor used in the step-up circuits.
> +	 * Select the optimal step-up factor for the operating voltage. To
> +	 * reduce power consumption, set a smaller factor.
> +	 *
> +	 * BT[2:0]   AVDD     VGH      VGL
> +	 * 0 0 0     VCI x 2  VCI x 7  VCI x 4
> +	 * 0 0 1                       VCI x 3
> +	 * 0 1 0              VCI x 6  VCI x 4
> +	 * 0 1 1		       VCI x 3
> +	 *
> +	 */
> +	u8 power_2;
> +	/** @vcom_1: VCOM Control 1(C5h) */
> +	/*
> +	 * VMH [6:0] : Set the VCOMH voltage
> +	 *
> +	 * VMH[6:0] VCOMH(V) VMH[6:0] VCOMH(V) VMH[6:0] VCOMH(V) VMH[6:0] VCOMH
> +	 * 0000000  2.700    0100000  3.500    1000000  4.300    1100000  5.100
> +	 * 0000001  2.725    0100001  3.525    1000001  4.325    1100001  5.125
> +	 * 0000010  2.750    0100010  3.550    1000010  4.350    1100010  5.150
> +	 * 0000011  2.775    0100011  3.575    1000011  4.375    1100011  5.175
> +	 * 0000100  2.800    0100100  3.600    1000100  4.400    1100100  5.200
> +	 * 0000101  2.825    0100101  3.625    1000101  4.425    1100101  5.225
> +	 * 0000110  2.850    0100110  3.650    1000110  4.450    1100110  5.250
> +	 * 0000111  2.875    0100111  3.675    1000111  4.475 	 1100111  5.275
> +	 * 0001000  2.900    0101000  3.700    1001000  4.500 	 1101000  5.300
> +	 * 0001001  2.925    0101001  3.725    1001001  4.525 	 1101001  5.325
> +	 * 0001010  2.950    0101010  3.750    1001010  4.550 	 1101010  5.350
> +	 * 0001011  2.975    0101011  3.775    1001011  4.575 	 1101011  5.375
> +	 * 0001100  3.000    0101100  3.800    1001100  4.600 	 1101100  5.400
> +	 * 0001101  3.025    0101101  3.825    1001101  4.625 	 1101101  5.425
> +	 * 0001110  3.050    0101110  3.850    1001110  4.650 	 1101110  5.450
> +	 * 0001111  3.075    0101111  3.875    1001111  4.675 	 1101111  5.475
> +	 * 0010000  3.100    0110000  3.900    1010000  4.700 	 1110000  5.500
> +	 * 0010001  3.125    0110001  3.925    1010001  4.725 	 1110001  5.525
> +	 * 0010010  3.150    0110010  3.950    1010010  4.750 	 1110010  5.550
> +	 * 0010011  3.175    0110011  3.975    1010011  4.775 	 1110011  5.575
> +	 * 0010100  3.200    0110100  4.000    1010100  4.800 	 1110100  5.600
> +	 * 0010101  3.225    0110101  4.025    1010101  4.825 	 1110101  5.625
> +	 * 0010110  3.250    0110110  4.050    1010110  4.850 	 1110110  5.650
> +	 * 0010111  3.275    0110111  4.075    1010111  4.875 	 1110111  5.675
> +	 * 0011000  3.300    0111000  4.100    1011000  4.900 	 1111000  5.700
> +	 * 0011001  3.325    0111001  4.125    1011001  4.925 	 1111001  5.725
> +	 * 0011010  3.350    0111010  4.150    1011010  4.950 	 1111010  5.750
> +	 * 0011011  3.375    0111011  4.175    1011011  4.975 	 1111011  5.775
> +	 * 0011100  3.400    0111100  4.200    1011100  5.000 	 1111100  5.800
> +	 * 0011101  3.425    0111101  4.225    1011101  5.025 	 1111101  5.825
> +	 * 0011110  3.450    0111110  4.250    1011110  5.050 	 1111110  5.850
> +	 * 0011111  3.475    0111111  4.275    1011111  5.075    1111111  5.875
> +	 *
> +	 * VML[6:0] : Set the VCOML voltage
> +	 *
> +	 * VML[6:0] VCOML(V) VML[6:0] VCOML(V) VML[6:0] VCOML(V) VML[6:0] VCOML
> +	 * 0000000 -2.500 0100000 -1.700 1000000 -0.900 1100000 -0.100
> +	 * 0000001 -2.475 0100001 -1.675 1000001 -0.875 1100001 -0.075
> +	 * 0000010 -2.450 0100010 -1.650 1000010 -0.850 1100010 -0.050
> +	 * 0000011 -2.425 0100011 -1.625 1000011 -0.825 1100011 -0.025
> +	 * 0000100 -2.400 0100100 -1.600 1000100 -0.800 1100100 0
> +	 * 0000101 -2.375 0100101 -1.575 1000101 -0.775 1100101 Reserved
> +	 * 0000110 -2.350 0100110 -1.550 1000110 -0.750 1100110 Reserved
> +	 * 0000111 -2.325 0100111 -1.525 1000111 -0.725 1100111 Reserved
> +	 * 0001000 -2.300 0101000 -1.500 1001000 -0.700 1101000 Reserved
> +	 * 0001001 -2.275 0101001 -1.475 1001001 -0.675 1101001 Reserved
> +	 * 0001010 -2.250 0101010 -1.450 1001010 -0.650 1101010 Reserved
> +	 * 0001011 -2.225 0101011 -1.425 1001011 -0.625 1101011 Reserved
> +	 * 0001100 -2.200 0101100 -1.400 1001100 -0.600 1101100 Reserved
> +	 * 0001101 -2.175 0101101 -1.375 1001101 -0.575 1101101 Reserved
> +	 * 0001110 -2.150 0101110 -1.350 1001110 -0.550 1101110 Reserved
> +	 * 0001111 -2.125 0101111 -1.325 1001111 -0.525 1101111 Reserved
> +	 * 0010000 -2.100 0110000 -1.300 1010000 -0.500 1110000 Reserved
> +	 * 0010001 -2.075 0110001 -1.275 1010001 -0.475 1110001 Reserved
> +	 * 0010010 -2.050 0110010 -1.250 1010010 -0.450 1110010 Reserved
> +	 * 0010011 -2.025 0110011 -1.225 1010011 -0.425 1110011 Reserved
> +	 * 0010100 -2.000 0110100 -1.200 1010100 -0.400 1110100 Reserved
> +	 * 0010101 -1.975 0110101 -1.175 1010101 -0.375 1110101 Reserved
> +	 * 0010110 -1.950 0110110 -1.150 1010110 -0.350 1110110 Reserved
> +	 * 0010111 -1.925 0110111 -1.125 1010111 -0.325 1110111 Reserved
> +	 * 0011000 -1.900 0111000 -1.100 1011000 -0.300 1111000 Reserved
> +	 * 0011001 -1.875 0111001 -1.075 1011001 -0.275 1111001 Reserved
> +	 * 0011010 -1.850 0111010 -1.050 1011010 -0.250 1111010 Reserved
> +	 * 0011011 -1.825 0111011 -1.025 1011011 -0.225 1111011 Reserved
> +	 * 0011100 -1.800 0111100 -1.000 1011100 -0.200 1111100 Reserved
> +	 * 0011101 -1.775 0111101 -0.975 1011101 -0.175 1111101 Reserved
> +	 * 0011110 -1.750 0111110 -0.950 1011110 -0.150 1111110 Reserved
> +	 * 0011111 -1.725 0111111 -0.925 1011111 -0.125 1111111 Reserved
> +	 */
> +	u8 vcom_1[ILI9341_VCOM_1_LEN];
> +	/** @vcom_2: VCOM Control 2(C7h) */
> +	/*
> +	 * C7h		VMCTRL1 (VCOM Control 1)
> +	 *		D/CX RDX WRX D17-8 D7  D6  D5 D4 D3 D2 D1 D0 HEX
> +	 * Command 	0    1   M   XX    1   1   0  0  0  1  1  1  C7h
> +	 * Parameter 	1    1   M   XX    nVM VMF[6:0]              C0
> +	 *
> +	 * nVM: nVM equals to “0” after power on reset and VCOM offset
> +	 * equals to program MTP value. When nVM set to “1”, setting
> +	 * of VMF [6:0] becomes valid and VCOMH/VCOML can be adjusted.
> +	 *
> +	 * VMF [6:0]: Set the VCOM offset voltage.
> +	 */
> +	u8 vcom_2;
> +	/** @address_mode: Memory Access Control (36h) */
> +	/*
> +	 * 36h 		MADCTL (Memory Access Control)
> +	 * 		D/CX RDX WRX D17-8 D7 D6 D5 D4 D3  D2 D1 D0 HEX
> +	 * Command 	0    1   M   XX    0  0  1  1  0   1  1  0  36h
> +	 * Parameter 	1    1   M   XX    MY MX MV ML BGR MH 0  0  00
> +	 *
> +	 * This command defines read/write scanning direction of frame memory.
> +	 * This command makes no change on the other driver status.
> +	 *
> +	 * Bit  Name 			 Description
> +	 * MY   Row Address Order
> +	 * MX   Column Address Order
> +	 * MV 	Row / Column Exchange 	 These 3 bits control MCU to memory
> +	 * 				 write/read direction.
> +	 * ML 	Vertical Refresh Order 	 LCD vertical refresh direction control.
> +	 * BGR 	RGB-BGR Order		 Color selector switch control
> +	 *                               (0=RGB color filter panel, 1=BGR
> +	 *                               color filter panel)
> +	 * MH 	Horizontal Refresh ORDER LCD horizontal refreshing
> +	 * direction control.
> +	 *
> +	 * Note: When BGR bit is changed, the new setting is active
> +	 * immediately without update the content in Frame Memory again.
> +	 *
> +	 */
> +	u8 address_mode;
> +	/** @g3amma_en: TODO: need comments for this register */
> +	u8 g3amma_en;
> +	/** @rgb_interface: RGB Interface Signal Control (B0h) */
> +	/*
> +	 * B0h 		IFMODE (Interface Mode Control)
> +	 * 		D/CX RDX WRX D17-8 D7 	       D6     D5     D4 D3   D2   D1  D0  HEX
> +	 * Command 	0    1   M   XX    1 	       0      1      1  0    0    0   0   B0h
> +	 * Parameter 	1    1   M   XX    ByPass_MODE RCM[1] RCM[0] 0  VSPL HSPL DPL EPL 40
> +	 *
> +	 * Sets the operation status of the display interface. The setting
> +	 * becomes effective as soon as the command is received.
> +	 * EPL: DE polarity (“0”= High enable for RGB interface, “1”= Low
> +	 * enable for RGB interface)
> +	 *
> +	 * DPL: DOTCLK polarity set (“0”= data fetched at the rising time,
> +	 * “1”= data fetched at the falling time)
> +	 *
> +	 * HSPL: HSYNC polarity (“0”= Low level sync clock, “1”= High
> +	 * level sync clock)
> +	 *
> +	 * VSPL: VSYNC polarity (“0”= Low level sync clock, “1”= High
> +	 * level sync clock)
> +	 *
> +	 * RCM [1:0]: RGB interface selection (refer to the RGB interface
> +	 * section).
> +	 *
> +	 * ByPass_MODE: Select display data path whether Memory or Direct to
> +	 * Shift register when RGB Interface is used.
> +	 *
> +	 * ByPass_MODE 	Display Data Path
> +	 * 0 		Direct to Shift Register (default)
> +	 * 1 		Memory
> +	 */
> +	u8 rgb_interface;
> +	/** @dfc_2: refer to dfc_1 */
> +	u8 dfc_2[ILI9341_DFC_2_LEN];
> +	/** @column_addr: Column Address Set (2Ah) */
> +	/* This command is used to define area of frame memory where MCU can
> +	 * access. This command makes no change on the
> +	 * other driver status. The values of SC [15:0] and EC [15:0] are
> +	 * referred when RAMWR command comes. Each value
> +	 * represents one column line in the Frame Memory.
> +	 */
> +	u8 column_addr[ILI9341_COLUMN_ADDR_LEN];
> +	/** @page_addr: Page Address Set (2Bh) */
> +	/* This command is used to define area of frame memory where MCU can
> +	 * access. This command makes no change on the
> +	 * other driver status. The values of SP [15:0] and EP [15:0] are
> +	 * referred when RAMWR command comes. Each value
> +	 * represents one Page line in the Frame Memory.
> +	 */
> +	u8 page_addr[ILI9341_PAGE_ADDR_LEN];
> +	/** @interface: Interface Control (F6h) */
> +	/*
> +	 * F6h 		IFCTL (16bits Data Format Selection)
> +	 * 	        D/CX RDX WRX D17-8 D7   D6   D5     D4     D3      D2     D1     D0      HEX
> +	 * Command      0    1   M   XX    1    1    1      1      0       1      1      0       F6h
> +	 * 1stParameter 1    1   M   XX    MY   MX   MV
> +	 * 				   _EOR _EOR _EOR   0      BGR_EOR 0      0      WE MODE 01
> +	 * 2ndParameter 1    1   M   XX    0    0    EPF[1] EPF[0] 0       0      MDT[1] MDT[0]  00
> +	 * 3rdParameter 1    1   M   XX    0    0    ENDIAN 0      DM[1]   DM[0]  RM     RIM     00
> +	 *
> +	 */
> +	u8 interface[ILI9341_INTERFACE_LEN];
> +	/** @pixel_format: This command sets the pixel format for the RGB image data used by */
> +	/* the interface. DPI [2:0] is the pixel format select of RGB
> +	 * interface and DBI [2:0] is the pixel format of MCU interface. If a
> +	 * particular interface, either RGB interface or MCU interface, is
> +	 * not used then the corresponding bits in the parameter are ignored.
> +	 * The pixel format is shown in the table below.
> +	 *
> +	 * DPI[2:0] 	RGB Interface Format 	DBI[2:0] MCU Interface Format
> +	 * 0 0 0 	Reserved 		0 0 0 	 Reserved
> +	 * 0 0 1 	Reserved 		0 0 1 	 Reserved
> +	 * 0 1 0 	Reserved 		0 1 0 	 Reserved
> +	 * 0 1 1 	Reserved 		0 1 1 	 Reserved
> +	 * 1 0 0 	Reserved 		1 0 0  	 Reserved
> +	 * 1 0 1 	16 bits / pixel 	1 0 1    16 bits / pixel
> +	 * 1 1 0 	18 bits / pixel 	1 1 0 	 18 bits / pixel
> +	 * 1 1 1 	Reserved 		1 1 1 	 Reserved
> +	 *
> +	 */
> +	u8 pixel_format;
> +	/** @gamma_curve: This command is used to select the desired Gamma curve for the */
> +	/* current display. A maximum of 4 fixed gamma curves can
> +	 * be selected. The curve is selected by setting the appropriate bit
> +	 * in the parameter as described in the Table:
> +	 *
> +	 * GC [7:0] 	Curve Selected
> +	 * 01h 		Gamma curve 1 (G2.2)
> +	 * 02h 		---
> +	 * 04h 		---
> +	 * 08h 		---
> +	 */
> +	u8 gamma_curve;
> +	/** @pgamma: Positive Gamma Correction (E0h) */
> +	/*
> +	 * Set the gray scale voltage to adjust the gamma characteristics of
> +	 * the TFT panel.
> +	 */
> +	u8 pgamma[ILI9341_PGAMMA_LEN];
> +	/** @ngamma: Negative Gamma Correction (E1h) */
> +	/*
> +	 * Set the gray scale voltage to adjust the gamma characteristics of
> +	 * the TFT panel.
> +	 */
> +	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;
> +	u32 max_spi_speed;
> +	struct regulator *vcc;
> +};
> +
> +/*
> + * 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,
> +	},
> +	/* TODO: need comments for this register */
> +	.ca = {0xc3, 0x08, 0x50},
> +	/* TODO: need comments for this register */
> +	.power_b = {0x00, 0xc1, 0x30},
> +	/* TODO: need comments for this register */
> +	.power_seq = {0x64, 0x03, 0x12, 0x81},
> +	/* TODO: need comments for this register */
> +	.dtca = {0x85, 0x00, 0x78},
> +	/* TODO: need comments for this register */
> +	.power_a = {0x39, 0x2c, 0x00, 0x34, 0x02},
> +	/* TODO: need comments for this register */
> +	.prc = 0x20,
> +	/* TODO: need comments for this register */
> +	.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 int ili9341_spi_transfer(struct spi_device *spi, u32 speed_hz,
> +			  u8 bpw, const void *buf, size_t len)
> +{
> +	size_t max_chunk = spi_max_transfer_size(spi);
> +	struct spi_transfer tr = {
> +		.bits_per_word = bpw,
> +		.speed_hz = speed_hz,
> +		.len = len,
> +	};
> +	struct spi_message m;
> +	size_t chunk;
> +	int ret;
> +
> +	spi_message_init_with_transfers(&m, &tr, 1);
> +
> +	while (len) {
> +		chunk = min(len, max_chunk);
> +
> +		tr.tx_buf = buf;
> +		tr.len = chunk;
> +		buf += chunk;
> +		len -= chunk;
> +
> +		ret = spi_sync(spi, &m);
> +		if (ret) {
> +			dev_err(&spi->dev, "spi_sync error: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +	return 0;
> +}
> +
> +static int _ili9341_command(struct ili9341 *ili, u8 cmd, const void *data,
> +				    size_t count)
> +{
> +	struct spi_device *spi = to_spi_device(ili->dev);
> +	int ret = 0;
> +
> +	gpiod_set_value_cansleep(ili->dc_gpio, 0);
> +
> +	ret = ili9341_spi_transfer(spi, ili->max_spi_speed, 8,
> +					(const void *)&cmd, 1);
> +	if (ret || data == NULL || count == 0) {
> +		return ret;
> +	}
> +
> +	gpiod_set_value_cansleep(ili->dc_gpio, 1);
> +
> +	return ili9341_spi_transfer(spi, ili->max_spi_speed, 8,
> +		data, count);
> +}
> +
> +static int ili9341_dpi_init(struct ili9341 *ili)
> +{
> +	int ret;
> +	ret = _ili9341_command(ili, 0xca,
> +			ili->conf->ca,
> +			ILI9341_CA_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_POWERB,
> +			ili->conf->power_b,
> +			ILI9341_POWER_B_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_POWER_SEQ,
> +			ili->conf->power_seq,
> +			ILI9341_POWER_SEQ_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_DTCA,
> +			ili->conf->dtca,
> +			ILI9341_DTCA_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_POWERA,
> +			ili->conf->power_a,
> +			ILI9341_POWER_A_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_PRC,
> +			&ili->conf->prc,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_DTCB,
> +			ili->conf->dtcb,
> +			ILI9341_DTCB_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_FRC,
> +			ili->conf->frc,
> +			ILI9341_FRC_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_DFC,
> +			ili->conf->dfc_1,
> +			ILI9341_DFC_1_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_POWER1,
> +			&ili->conf->power_1,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_POWER2,
> +			&ili->conf->power_2,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_VCOM1,
> +			ili->conf->vcom_1,
> +			ILI9341_VCOM_1_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_VCOM2,
> +			&ili->conf->vcom_2,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, MIPI_DCS_SET_ADDRESS_MODE,
> +			&ili->conf->address_mode,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_3GAMMA_EN,
> +			&ili->conf->g3amma_en,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_RGB_INTERFACE,
> +			&ili->conf->rgb_interface,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_DFC,
> +			ili->conf->dfc_2,
> +			ILI9341_DFC_2_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, MIPI_DCS_SET_COLUMN_ADDRESS,
> +			ili->conf->column_addr,
> +			ILI9341_COLUMN_ADDR_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, MIPI_DCS_SET_PAGE_ADDRESS,
> +			ili->conf->page_addr,
> +			ILI9341_PAGE_ADDR_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_INTERFACE,
> +			ili->conf->interface,
> +			ILI9341_INTERFACE_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, MIPI_DCS_SET_PIXEL_FORMAT,
> +			&ili->conf->pixel_format,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = ili9341_command(ili, MIPI_DCS_WRITE_MEMORY_START);
> +	if (ret)
> +		return ret;
> +
> +	msleep(200);
> +	ret = _ili9341_command(ili, MIPI_DCS_SET_GAMMA_CURVE,
> +			&ili->conf->gamma_curve,
> +			1);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_PGAMMA,
> +			ili->conf->pgamma,
> +			ILI9341_PGAMMA_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = _ili9341_command(ili, ILI9341_NGAMMA,
> +			ili->conf->ngamma,
> +			ILI9341_NGAMMA_LEN);
> +	if (ret)
> +		return ret;
> +
> +	ret = ili9341_command(ili, MIPI_DCS_EXIT_SLEEP_MODE);
> +	if (ret)
> +		return ret;
> +
> +	msleep(200);
> +	ret = ili9341_command(ili, MIPI_DCS_SET_DISPLAY_ON);
> +	if (ret)
> +		return ret;
> +
> +	ret = ili9341_command(ili, MIPI_DCS_WRITE_MEMORY_START);
> +	if (ret)
> +		return ret;
> +
> +	dev_info(ili->dev, "initialized display rgb interface\n");
> +
> +	return 0;
> +}
> +
> +static int ili9341_dpi_power_on(struct ili9341 *ili)
> +{
> +	int ret = 0;
> +
> +	/* Assert RESET */
> +	gpiod_set_value(ili->reset_gpio, 1);
> +
> +	/* Enable power */
> +	if (!IS_ERR(ili->vcc)) {
> +		ret = regulator_enable(ili->vcc);
> +		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(10);
> +
> +	return 0;
> +}
> +
> +static int ili9341_dpi_power_off(struct ili9341 *ili)
> +{
> +	/* Assert RESET */
> +	gpiod_set_value(ili->reset_gpio, 1);
> +
> +	/* Disable power */
> +	if (!IS_ERR(ili->vcc))
> +		return regulator_disable(ili->vcc);
> +
> +	return 0;
> +}
> +
> +static int ili9341_dpi_disable(struct drm_panel *panel)
> +{
> +	struct ili9341 *ili = panel_to_ili9341(panel);
> +
> +	ili9341_command(ili, 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;
> +
> +	ret = ili9341_dpi_init(ili);
> +	if (ret < 0)
> +		ili9341_dpi_unprepare(panel);
> +
> +	return ret;
> +}
> +
> +static int ili9341_dpi_enable(struct drm_panel *panel)
> +{
> +	struct ili9341 *ili = panel_to_ili9341(panel);
> +
> +	ili9341_command(ili, 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 int ili9341_dpi_probe(struct spi_device *spi)
> +{
> +	int ret;
> +	struct device *dev = &spi->dev;
> +	struct ili9341 *ili;
> +
> +	ili = devm_kzalloc(dev, sizeof(struct ili9341), 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;
> +	}
> +
> +	ili->vcc = devm_regulator_get_optional(dev, "vcc");
> +	if (IS_ERR(ili->vcc))
> +		dev_err(dev, "get optional vcc failed\n");
> +
> +	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);
> +	}
> +
> +	ili->dc_gpio = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
> +	if (IS_ERR(ili->dc_gpio)) {
> +		dev_err(dev, "failed to get DC GPIO\n");
> +		return PTR_ERR(ili->dc_gpio);
> +	}
> +
> +	spi->bits_per_word = 8;
> +	ret = spi_setup(spi);
> +	if (ret < 0) {
> +		dev_err(dev, "spi setup failed.\n");
> +		return ret;
> +	}
> +
> +	ili->max_spi_speed = ili->conf->max_spi_speed;
> +
> +	drm_panel_init(&ili->panel, dev, &ili9341_dpi_funcs,
> +		       DRM_MODE_CONNECTOR_DPI);
> +
> +	drm_panel_add(&ili->panel);
> +
> +	return 0;
> +}
> +
> +
> +
> +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			= "20180514",
> +	.major			= 1,
> +	.minor			= 0,
> +};
> +static int ili9341_dbi_probe(struct spi_device *spi)
> +{
> +	struct mipi_dbi_dev *dbidev;
> +	struct drm_device *drm;
> +	struct mipi_dbi *dbi;
> +	struct gpio_desc *dc;
> +	struct device *dev = &spi->dev;
> +	u32 rotation = 0;
> +	int ret;
> +
> +	dbidev = devm_drm_dev_alloc(dev, &ili9341_dbi_driver,
> +				    struct mipi_dbi_dev, drm);
> +	if (IS_ERR(dbidev))
> +		return PTR_ERR(dbidev);
> +
> +	dbi = &dbidev->dbi;
> +	drm = &dbidev->drm;
> +
> +	drm_mode_config_init(drm);
> +
> +	dbi->reset = devm_gpiod_get_optional(dev, "reset",
> +					GPIOD_OUT_HIGH);
> +	if (IS_ERR(dbi->reset)) {
> +		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
> +		return PTR_ERR(dbi->reset);
> +	}
> +
> +	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
> +	if (IS_ERR(dc)) {
> +		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
> +		return PTR_ERR(dc);
> +	}
> +
> +	dbidev->regulator = devm_regulator_get_optional(dev, "vcc");
> +	if (IS_ERR(dbidev->regulator))
> +		dev_err(dev, "get optional vcc failed\n");
> +
> +	dbidev->backlight = devm_of_find_backlight(dev);
> +	if (IS_ERR(dbidev->backlight))
> +		return PTR_ERR(dbidev->backlight);
> +
> +	device_property_read_u32(dev, "rotation", &rotation);
> +
> +	ret = mipi_dbi_spi_init(spi, dbi, dc);
> +	if (ret)
> +		return ret;
> +
> +	ret = mipi_dbi_dev_init(dbidev, &ili9341_dbi_funcs,
> +					&ili9341_dbi_mode, rotation);
> +	if (ret)
> +		return ret;
> +
> +	drm_mode_config_reset(drm);
> +
> +	ret = drm_dev_register(drm, 0);
> +	if (ret)
> +		return ret;
> +
> +	spi_set_drvdata(spi, drm);
> +
> +	drm_fbdev_generic_setup(drm, 0);
> +
> +	return 0;
> +}
> +static int ili9341_probe(struct spi_device *spi)
> +{
> +	const struct spi_device_id *id = spi_get_device_id(spi);
> +
> +	if (!strcmp(id->name, "sf-tc240t-9370-t"))
> +		return ili9341_dpi_probe(spi);
> +	else if (!strcmp(id->name, "yx240qv29"))
> +		return ili9341_dbi_probe(spi);
> +
> +	return -1;
> +}
> +
> +static int ili9341_remove(struct spi_device *spi)
> +{
> +	const struct spi_device_id *id = spi_get_device_id(spi);
> +	struct ili9341 *ili = spi_get_drvdata(spi);
> +	struct drm_device *drm = spi_get_drvdata(spi);
> +
> +	if (!strcmp(id->name, "sf-tc240t-9370-t")) {
> +		ili9341_dpi_power_off(ili);
> +		drm_panel_remove(&ili->panel);
> +	} else if (!strcmp(id->name, "yx240qv29")) {
> +		drm_dev_unplug(drm);
> +		drm_atomic_helper_shutdown(drm);
> +	}
> +	return 0;
> +}
> +
> +static void ili9341_shutdown(struct spi_device *spi)
> +{
> +	const struct spi_device_id *id = spi_get_device_id(spi);
> +
> +	if (!strcmp(id->name, "yx240qv29"))
> +		drm_atomic_helper_shutdown(spi_get_drvdata(spi));
> +}
> +
> +static const struct of_device_id ili9341_of_match[] = {
> +	{
> +		.compatible = "st,sf-tc240t-9370-t",
> +		.data = &ili9341_stm32f429_disco_data,
> +	},
> +	{
> +		/* porting from tiny/ili9341.c
> +		 * for original mipi dbi compitable
> +		 */
> +		.compatible = "adafruit,yx240qv29",
> +		.data = NULL,
> +	},
> +};
> +MODULE_DEVICE_TABLE(of, ili9341_of_match);
> +
> +static const struct spi_device_id ili9341_id[] = {
> +	{ "yx240qv29", 0 },
> +	{ "sf-tc240t-9370-t", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(spi, ili9341_id);
> +
> +static struct spi_driver ili9341_driver = {
> +	.probe = ili9341_probe,
> +	.remove = ili9341_remove,
> +	.shutdown = ili9341_shutdown,
> +	.id_table = ili9341_id,
> +	.driver = {
> +		.name = "panel-ilitek-ili9341",
> +		.of_match_table = ili9341_of_match,
> +	},
> +};
> +module_spi_driver(ili9341_driver);
> +
> +MODULE_AUTHOR("Dillon Min <dillon.minfei@gmail.com>");
> +MODULE_DESCRIPTION("ILI9341 LCD panel driver");
> +MODULE_LICENSE("GPL v2");
>