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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> <56b41c37-147b-bf89-c840-2c5f08863a36@foss.st.com>
In-Reply-To: <56b41c37-147b-bf89-c840-2c5f08863a36@foss.st.com>
From:   Dillon Min <dillon.minfei@gmail.com>
Date:   Mon, 31 May 2021 21:39:57 +0800
Message-ID: <CAL9mu0KQpk97RNUf=50FXoOHWfT_LzhZddxLo4AnC=xYCTYkrQ@mail.gmail.com>
Subject: Re: [PATCH 1/4] drm/panel: Add ilitek ili9341 panel driver
To:     Patrice CHOTARD <patrice.chotard@foss.st.com>
Cc:     pierre-yves.mordret@foss.st.com, alain.volmat@foss.st.com,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre TORGUE <alexandre.torgue@foss.st.com>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        christian.koenig@amd.com,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>, linux-i2c@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-media <linux-media@vger.kernel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
        linaro-mm-sig@lists.linaro.org,
        linux-clk <linux-clk@vger.kernel.org>
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On Mon, May 31, 2021 at 9:15 PM Patrice CHOTARD
<patrice.chotard@foss.st.com> wrote:
>
> 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.

Sorry for the inconvenience, I will double verify the 'git am' process
on this patch later.

Thanks.

Best Regards
Dillon

>
> 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-dil=
lon.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/Kcon=
fig
> > 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/Mak=
efile
> > index cae4d976c069..0ecde184665d 100644
> > --- a/drivers/gpu/drm/panel/Makefile
> > +++ b/drivers/gpu/drm/panel/Makefile
> > @@ -11,6 +11,7 @@ obj-$(CONFIG_DRM_PANEL_ELIDA_KD35T133) +=3D panel-eli=
da-kd35t133.o
> >  obj-$(CONFIG_DRM_PANEL_FEIXIN_K101_IM2BA02) +=3D panel-feixin-k101-im2=
ba02.o
> >  obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) +=3D panel-feiyang-fy0=
7024di26a30d.o
> >  obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) +=3D panel-ilitek-ili9322.o
> > +obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9341) +=3D panel-ilitek-ili9341.o
> >  obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) +=3D panel-ilitek-ili9881c.o
> >  obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) +=3D panel-innolux-p079zca.o
> >  obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) +=3D 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 regi=
ster */
> > +#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 reg=
ister */
> > +#define ILI9341_NGAMMA         0xe1   /* Negative Gamma Correction reg=
ister */
> > +#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[] =3D { 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=3Dfosc/(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 mo=
de.
> > +      *
> > +      * 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 ou=
tput
> > +      *               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 i=
n 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 driv=
er.
> > +      * 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 =3D 0 can be reversed by setting GS =3D 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. T=
o
> > +      * 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 =E2=80=9C0=E2=80=9D after power on reset an=
d VCOM offset
> > +      * equals to program MTP value. When nVM set to =E2=80=9C1=E2=80=
=9D, 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 me=
mory.
> > +      * 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 memo=
ry
> > +      *                               write/read direction.
> > +      * ML   Vertical Refresh Order   LCD vertical refresh direction c=
ontrol.
> > +      * BGR  RGB-BGR Order            Color selector switch control
> > +      *                               (0=3DRGB color filter panel, 1=
=3DBGR
> > +      *                               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 D=
3   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  V=
SPL HSPL DPL EPL 40
> > +      *
> > +      * Sets the operation status of the display interface. The settin=
g
> > +      * becomes effective as soon as the command is received.
> > +      * EPL: DE polarity (=E2=80=9C0=E2=80=9D=3D High enable for RGB i=
nterface, =E2=80=9C1=E2=80=9D=3D Low
> > +      * enable for RGB interface)
> > +      *
> > +      * DPL: DOTCLK polarity set (=E2=80=9C0=E2=80=9D=3D data fetched =
at the rising time,
> > +      * =E2=80=9C1=E2=80=9D=3D data fetched at the falling time)
> > +      *
> > +      * HSPL: HSYNC polarity (=E2=80=9C0=E2=80=9D=3D Low level sync cl=
ock, =E2=80=9C1=E2=80=9D=3D High
> > +      * level sync clock)
> > +      *
> > +      * VSPL: VSYNC polarity (=E2=80=9C0=E2=80=9D=3D Low level sync cl=
ock, =E2=80=9C1=E2=80=9D=3D 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_EO=
R 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, i=
s
> > +      * not used then the corresponding bits in the parameter are igno=
red.
> > +      * The pixel format is shown in the table below.
> > +      *
> > +      * DPI[2:0]     RGB Interface Format    DBI[2:0] MCU Interface Fo=
rmat
> > +      * 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 Gamm=
a 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 con=
troller
> > + */
> > +static const struct ili9341_config ili9341_stm32f429_disco_data =3D {
> > +     .max_spi_speed =3D 10000000,
> > +     .mode =3D {
> > +             .clock =3D 6100,
> > +             .hdisplay =3D 240,
> > +             .hsync_start =3D 240 + 10,/* hfp 10 */
> > +             .hsync_end =3D 240 + 10 + 10,/* hsync 10 */
> > +             .htotal =3D 240 + 10 + 10 + 20,/* hbp 20 */
> > +             .vdisplay =3D 320,
> > +             .vsync_start =3D 320 + 4,/* vfp 4 */
> > +             .vsync_end =3D 320 + 4 + 2,/* vsync 2 */
> > +             .vtotal =3D 320 + 4 + 2 + 2,/* vbp 2 */
> > +             .flags =3D 0,
> > +             .width_mm =3D 65,
> > +             .height_mm =3D 50,
> > +             .type =3D DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> > +     },
> > +     /* TODO: need comments for this register */
> > +     .ca =3D {0xc3, 0x08, 0x50},
> > +     /* TODO: need comments for this register */
> > +     .power_b =3D {0x00, 0xc1, 0x30},
> > +     /* TODO: need comments for this register */
> > +     .power_seq =3D {0x64, 0x03, 0x12, 0x81},
> > +     /* TODO: need comments for this register */
> > +     .dtca =3D {0x85, 0x00, 0x78},
> > +     /* TODO: need comments for this register */
> > +     .power_a =3D {0x39, 0x2c, 0x00, 0x34, 0x02},
> > +     /* TODO: need comments for this register */
> > +     .prc =3D 0x20,
> > +     /* TODO: need comments for this register */
> > +     .dtcb =3D {0x00, 0x00},
> > +     /* 0x00 fosc, 0x1b 70hz */
> > +     .frc =3D {0x00, 0x1b},
> > +     /* 0x0a Interval scan, AGND AGND AGND AGND
> > +      * 0xa2 Normally white, G1 -> G320, S720 -> S1,
> > +      *      Scan Cycle 5 frames,85ms
> > +      */
> > +     .dfc_1 =3D {0x0a, 0xa2},
> > +     /* 0x10 3.65v */
> > +     .power_1 =3D 0x10,
> > +     /* 0x10 AVDD=3Dvci*2, VGH=3Dvci*7, VGL=3D-vci*4 */
> > +     .power_2 =3D 0x10,
> > +     /* 0x45 VCOMH 4.425v, 0x15 VCOML -1.975*/
> > +     .vcom_1 =3D {0x45, 0x15},
> > +     /* 0x90 offset voltage, VMH-48, VML-48 */
> > +     .vcom_2 =3D 0x90,
> > +     /* 0xc8 Row Address Order, Column Address Order
> > +      *      BGR 1
> > +      */
> > +     .address_mode =3D 0xc8,
> > +     .g3amma_en =3D 0x00,
> > +     /* 0xc2
> > +      * Display Data Path: Memory
> > +      * RGB: DE mode
> > +      * DOTCLK polarity set (data fetched at the falling time)
> > +      */
> > +     .rgb_interface =3D 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 part=
ial
> > +      * display mode: AGND AGND AGND AGND
> > +      *
> > +      * 0xa7
> > +      * Scan Cycle: 15 frames
> > +      * fFLM =3D 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 =3D {0x0a, 0xa7, 0x27, 0x04},
> > +     /* column address: 240 */
> > +     .column_addr =3D {0x00, 0x00, (ILI9341_COLUMN_ADDR >> 4) & 0xff,
> > +                             ILI9341_COLUMN_ADDR & 0xff},
> > +     /* page address: 320 */
> > +     .page_addr =3D {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 followi=
ng
> > +      * column and page.
> > +      * Display Operation Mode: RGB Interface Mode
> > +      * Interface for RAM Access: RGB interface
> > +      * 16- bit RGB interface (1 transfer/pixel)
> > +      */
> > +     .interface =3D {ILI9341_IF_WE_MODE, 0x00,
> > +                     ILI9341_IF_DM_RGB | ILI9341_IF_RM_RGB},
> > +     /* DPI: 16 bits / pixel */
> > +     .pixel_format =3D ILI9341_PIXEL_DPI_16_BITS,
> > +     /* Curve Selected: Gamma curve 1 (G2.2) */
> > +     .gamma_curve =3D ILI9341_GAMMA_CURVE_1,
> > +     .pgamma =3D {0x0f, 0x29, 0x24, 0x0c, 0x0e,
> > +                     0x09, 0x4e, 0x78, 0x3c, 0x09,
> > +                     0x13, 0x05, 0x17, 0x11, 0x00},
> > +     .ngamma =3D {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 =3D spi_max_transfer_size(spi);
> > +     struct spi_transfer tr =3D {
> > +             .bits_per_word =3D bpw,
> > +             .speed_hz =3D speed_hz,
> > +             .len =3D len,
> > +     };
> > +     struct spi_message m;
> > +     size_t chunk;
> > +     int ret;
> > +
> > +     spi_message_init_with_transfers(&m, &tr, 1);
> > +
> > +     while (len) {
> > +             chunk =3D min(len, max_chunk);
> > +
> > +             tr.tx_buf =3D buf;
> > +             tr.len =3D chunk;
> > +             buf +=3D chunk;
> > +             len -=3D chunk;
> > +
> > +             ret =3D 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 *d=
ata,
> > +                                 size_t count)
> > +{
> > +     struct spi_device *spi =3D to_spi_device(ili->dev);
> > +     int ret =3D 0;
> > +
> > +     gpiod_set_value_cansleep(ili->dc_gpio, 0);
> > +
> > +     ret =3D ili9341_spi_transfer(spi, ili->max_spi_speed, 8,
> > +                                     (const void *)&cmd, 1);
> > +     if (ret || data =3D=3D NULL || count =3D=3D 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 =3D _ili9341_command(ili, 0xca,
> > +                     ili->conf->ca,
> > +                     ILI9341_CA_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_POWERB,
> > +                     ili->conf->power_b,
> > +                     ILI9341_POWER_B_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_POWER_SEQ,
> > +                     ili->conf->power_seq,
> > +                     ILI9341_POWER_SEQ_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_DTCA,
> > +                     ili->conf->dtca,
> > +                     ILI9341_DTCA_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_POWERA,
> > +                     ili->conf->power_a,
> > +                     ILI9341_POWER_A_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_PRC,
> > +                     &ili->conf->prc,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_DTCB,
> > +                     ili->conf->dtcb,
> > +                     ILI9341_DTCB_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_FRC,
> > +                     ili->conf->frc,
> > +                     ILI9341_FRC_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_DFC,
> > +                     ili->conf->dfc_1,
> > +                     ILI9341_DFC_1_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_POWER1,
> > +                     &ili->conf->power_1,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_POWER2,
> > +                     &ili->conf->power_2,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_VCOM1,
> > +                     ili->conf->vcom_1,
> > +                     ILI9341_VCOM_1_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_VCOM2,
> > +                     &ili->conf->vcom_2,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, MIPI_DCS_SET_ADDRESS_MODE,
> > +                     &ili->conf->address_mode,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_3GAMMA_EN,
> > +                     &ili->conf->g3amma_en,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_RGB_INTERFACE,
> > +                     &ili->conf->rgb_interface,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_DFC,
> > +                     ili->conf->dfc_2,
> > +                     ILI9341_DFC_2_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, MIPI_DCS_SET_COLUMN_ADDRESS,
> > +                     ili->conf->column_addr,
> > +                     ILI9341_COLUMN_ADDR_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, MIPI_DCS_SET_PAGE_ADDRESS,
> > +                     ili->conf->page_addr,
> > +                     ILI9341_PAGE_ADDR_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_INTERFACE,
> > +                     ili->conf->interface,
> > +                     ILI9341_INTERFACE_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, MIPI_DCS_SET_PIXEL_FORMAT,
> > +                     &ili->conf->pixel_format,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D ili9341_command(ili, MIPI_DCS_WRITE_MEMORY_START);
> > +     if (ret)
> > +             return ret;
> > +
> > +     msleep(200);
> > +     ret =3D _ili9341_command(ili, MIPI_DCS_SET_GAMMA_CURVE,
> > +                     &ili->conf->gamma_curve,
> > +                     1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_PGAMMA,
> > +                     ili->conf->pgamma,
> > +                     ILI9341_PGAMMA_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D _ili9341_command(ili, ILI9341_NGAMMA,
> > +                     ili->conf->ngamma,
> > +                     ILI9341_NGAMMA_LEN);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D ili9341_command(ili, MIPI_DCS_EXIT_SLEEP_MODE);
> > +     if (ret)
> > +             return ret;
> > +
> > +     msleep(200);
> > +     ret =3D ili9341_command(ili, MIPI_DCS_SET_DISPLAY_ON);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D 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 =3D 0;
> > +
> > +     /* Assert RESET */
> > +     gpiod_set_value(ili->reset_gpio, 1);
> > +
> > +     /* Enable power */
> > +     if (!IS_ERR(ili->vcc)) {
> > +             ret =3D 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 =3D 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 =3D panel_to_ili9341(panel);
> > +
> > +     return ili9341_dpi_power_off(ili);
> > +}
> > +
> > +static int ili9341_dpi_prepare(struct drm_panel *panel)
> > +{
> > +     struct ili9341 *ili =3D panel_to_ili9341(panel);
> > +     int ret;
> > +
> > +     ret =3D ili9341_dpi_power_on(ili);
> > +     if (ret < 0)
> > +             return ret;
> > +
> > +     ret =3D 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 =3D 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 =3D panel_to_ili9341(panel);
> > +     struct drm_device *drm =3D connector->dev;
> > +     struct drm_display_mode *mode;
> > +     struct drm_display_info *info;
> > +
> > +     info =3D &connector->display_info;
> > +     info->width_mm =3D ili->conf->mode.width_mm;
> > +     info->height_mm =3D ili->conf->mode.height_mm;
> > +
> > +     if (ili->conf->rgb_interface & ILI9341_RGB_DPL)
> > +             info->bus_flags |=3D DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
> > +     else
> > +             info->bus_flags |=3D DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
> > +
> > +     if (ili->conf->rgb_interface & ILI9341_RGB_EPL)
> > +             info->bus_flags |=3D DRM_BUS_FLAG_DE_LOW;
> > +     else
> > +             info->bus_flags |=3D DRM_BUS_FLAG_DE_HIGH;
> > +
> > +     mode =3D 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 |=3D DRM_MODE_FLAG_PHSYNC;
> > +     else
> > +             mode->flags |=3D DRM_MODE_FLAG_NHSYNC;
> > +
> > +     if (ili->conf->rgb_interface & ILI9341_RGB_VSPL)
> > +             mode->flags |=3D DRM_MODE_FLAG_PVSYNC;
> > +     else
> > +             mode->flags |=3D DRM_MODE_FLAG_NVSYNC;
> > +
> > +     drm_mode_probed_add(connector, mode);
> > +
> > +     return 1; /* Number of modes */
> > +}
> > +
> > +static const struct drm_panel_funcs ili9341_dpi_funcs =3D {
> > +     .disable =3D ili9341_dpi_disable,
> > +     .unprepare =3D ili9341_dpi_unprepare,
> > +     .prepare =3D ili9341_dpi_prepare,
> > +     .enable =3D ili9341_dpi_enable,
> > +     .get_modes =3D ili9341_dpi_get_modes,
> > +};
> > +
> > +static int ili9341_dpi_probe(struct spi_device *spi)
> > +{
> > +     int ret;
> > +     struct device *dev =3D &spi->dev;
> > +     struct ili9341 *ili;
> > +
> > +     ili =3D devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL);
> > +     if (!ili)
> > +             return -ENOMEM;
> > +
> > +     spi_set_drvdata(spi, ili);
> > +
> > +     ili->dev =3D dev;
> > +     /*
> > +      * Every new incarnation of this display must have a unique
> > +      * data entry for the system in this driver.
> > +      */
> > +     ili->conf =3D of_device_get_match_data(dev);
> > +     if (!ili->conf) {
> > +             dev_err(dev, "missing device configuration\n");
> > +             return -ENODEV;
> > +     }
> > +
> > +     ili->vcc =3D devm_regulator_get_optional(dev, "vcc");
> > +     if (IS_ERR(ili->vcc))
> > +             dev_err(dev, "get optional vcc failed\n");
> > +
> > +     ili->reset_gpio =3D 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 =3D 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 =3D 8;
> > +     ret =3D spi_setup(spi);
> > +     if (ret < 0) {
> > +             dev_err(dev, "spi setup failed.\n");
> > +             return ret;
> > +     }
> > +
> > +     ili->max_spi_speed =3D 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 =3D drm_to_mipi_dbi_dev(pipe->crtc.de=
v);
> > +     struct mipi_dbi *dbi =3D &dbidev->dbi;
> > +     u8 addr_mode;
> > +     int ret, idx;
> > +
> > +     if (!drm_dev_enter(pipe->crtc.dev, &idx))
> > +             return;
> > +
> > +     DRM_DEBUG_KMS("\n");
> > +
> > +     ret =3D mipi_dbi_poweron_conditional_reset(dbidev);
> > +     if (ret < 0)
> > +             goto out_exit;
> > +     if (ret =3D=3D 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, 0x0=
2);
> > +     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_1P=
5V);
> > +     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 & 0x=
1f);
> > +
> > +     /* Gamma */
> > +     mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, 0x00);
> > +     mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, ILI9341_GAMMA_CUR=
VE_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 =3D ILI9341_MADCTL_MX;
> > +             break;
> > +     case 90:
> > +             addr_mode =3D ILI9341_MADCTL_MV;
> > +             break;
> > +     case 180:
> > +             addr_mode =3D ILI9341_MADCTL_MY;
> > +             break;
> > +     case 270:
> > +             addr_mode =3D ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
> > +                         ILI9341_MADCTL_MX;
> > +             break;
> > +     }
> > +     addr_mode |=3D 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 =
=3D {
> > +     .enable =3D ili9341_dbi_enable,
> > +     .disable =3D mipi_dbi_pipe_disable,
> > +     .update =3D mipi_dbi_pipe_update,
> > +     .prepare_fb =3D drm_gem_simple_display_pipe_prepare_fb,
> > +};
> > +
> > +static const struct drm_display_mode ili9341_dbi_mode =3D {
> > +     DRM_SIMPLE_MODE(240, 320, 37, 49),
> > +};
> > +
> > +DEFINE_DRM_GEM_CMA_FOPS(ili9341_dbi_fops);
> > +
> > +static struct drm_driver ili9341_dbi_driver =3D {
> > +     .driver_features        =3D DRIVER_GEM | DRIVER_MODESET | DRIVER_=
ATOMIC,
> > +     .fops                   =3D &ili9341_dbi_fops,
> > +     DRM_GEM_CMA_DRIVER_OPS_VMAP,
> > +     .debugfs_init           =3D mipi_dbi_debugfs_init,
> > +     .name                   =3D "ili9341",
> > +     .desc                   =3D "Ilitek ILI9341",
> > +     .date                   =3D "20180514",
> > +     .major                  =3D 1,
> > +     .minor                  =3D 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 =3D &spi->dev;
> > +     u32 rotation =3D 0;
> > +     int ret;
> > +
> > +     dbidev =3D devm_drm_dev_alloc(dev, &ili9341_dbi_driver,
> > +                                 struct mipi_dbi_dev, drm);
> > +     if (IS_ERR(dbidev))
> > +             return PTR_ERR(dbidev);
> > +
> > +     dbi =3D &dbidev->dbi;
> > +     drm =3D &dbidev->drm;
> > +
> > +     drm_mode_config_init(drm);
> > +
> > +     dbi->reset =3D 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 =3D 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 =3D devm_regulator_get_optional(dev, "vcc");
> > +     if (IS_ERR(dbidev->regulator))
> > +             dev_err(dev, "get optional vcc failed\n");
> > +
> > +     dbidev->backlight =3D devm_of_find_backlight(dev);
> > +     if (IS_ERR(dbidev->backlight))
> > +             return PTR_ERR(dbidev->backlight);
> > +
> > +     device_property_read_u32(dev, "rotation", &rotation);
> > +
> > +     ret =3D mipi_dbi_spi_init(spi, dbi, dc);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret =3D mipi_dbi_dev_init(dbidev, &ili9341_dbi_funcs,
> > +                                     &ili9341_dbi_mode, rotation);
> > +     if (ret)
> > +             return ret;
> > +
> > +     drm_mode_config_reset(drm);
> > +
> > +     ret =3D 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 =3D 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 =3D spi_get_device_id(spi);
> > +     struct ili9341 *ili =3D spi_get_drvdata(spi);
> > +     struct drm_device *drm =3D 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 =3D 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[] =3D {
> > +     {
> > +             .compatible =3D "st,sf-tc240t-9370-t",
> > +             .data =3D &ili9341_stm32f429_disco_data,
> > +     },
> > +     {
> > +             /* porting from tiny/ili9341.c
> > +              * for original mipi dbi compitable
> > +              */
> > +             .compatible =3D "adafruit,yx240qv29",
> > +             .data =3D NULL,
> > +     },
> > +};
> > +MODULE_DEVICE_TABLE(of, ili9341_of_match);
> > +
> > +static const struct spi_device_id ili9341_id[] =3D {
> > +     { "yx240qv29", 0 },
> > +     { "sf-tc240t-9370-t", 0 },
> > +     { }
> > +};
> > +MODULE_DEVICE_TABLE(spi, ili9341_id);
> > +
> > +static struct spi_driver ili9341_driver =3D {
> > +     .probe =3D ili9341_probe,
> > +     .remove =3D ili9341_remove,
> > +     .shutdown =3D ili9341_shutdown,
> > +     .id_table =3D ili9341_id,
> > +     .driver =3D {
> > +             .name =3D "panel-ilitek-ili9341",
> > +             .of_match_table =3D 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");
> >