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Date:   Sat, 9 May 2020 22:06:54 +0200
From:   Sam Ravnborg <sam@ravnborg.org>
To:     dillon min <dillon.minfei@gmail.com>
Cc:     mcoquelin.stm32@gmail.com,
        Alexandre Torgue <alexandre.torgue@st.com>,
        devicetree@vger.kernel.org, airlied@linux.ie,
        Michael Turquette <mturquette@baylibre.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-clk@vger.kernel.org, sboyd@kernel.org, robh+dt@kernel.org,
        thierry.reding@gmail.com, linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 5/5] drm/panel: add panel driver for Ilitek ili9341
 panels
Message-ID: <20200509200654.GC30802@ravnborg.org>
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 <20200508090247.GA11575@ravnborg.org>
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Hi Dillon.

On Fri, May 08, 2020 at 06:13:43PM +0800, dillon min wrote:
> Hi Sam,
> 
>   Thanks for your comments, i will rework this panel driver after l3gd20
> patch submission.
> 
> Sam Ravnborg <sam@ravnborg.org> 于2020年5月8日周五 下午5:02写道：
> 
> > Hi Dillon.
> >
> > Patch submissions starts to look fine.
> >
> > On Fri, May 08, 2020 at 12:13:14PM +0800, dillon.minfei@gmail.com wrote:
> > > From: dillon min <dillon.minfei@gmail.com>
> > >
> > > This is a driver for 320x240 TFT panels, accepting a rgb input
> > > streams that get adapted and scaled to the panel.
> > This driver is, I suppose, prepared to be a driver for ILI9341 based
> > panles, and as such not for a fixed resolution.
> > I expect (hope) we in the future will see more panels added.
> >
> > As i checked ili9341 datasheets, this panel just support 240x320
> resolution only.  if i'm wrong , please correct me. thanks
> https://cdn-shop.adafruit.com/datasheets/ILI9341.pdf
> 
> This panel can support 9 different kinds of interface , "3/4-line Serial
> Interface" have been supported by tiny/ili9341.c. i was verified it
> but the performance on stm32f4 is very low.
It had somehow escaped my mind we already have a driver for ili9341
based panels.
And we do not want onyl one driver for this IC.
So please extent the current driver to match your panel as well as
the original panel.
And then also extend the current binding for ili9341, which
you may have to convert to DT Schema in the process.

This is more work now but when it is done we end up with a much better
solution than if we introduce an additional driver for ili9341.

Sorry for not catching this in the inital review.

	Sam


> 
> currently, i just have stm32f429-disco in hands, with 18-bit parallel rgb
> bus connected on this board. reference to panel-ilitek-ili9322 and
> panel-ilitek-ili9881 driver, i have some plan to rewrite this driver.
> 
> 1 add your below comments in.
> 2 use dc-gpio, reset-gpio, rgb-interface-bits from dts to config panel
> interface.
> 3 drop regmap, porting drm_mipi_dbi's mipi_dbi_command to config panel
> paramter. like tiny/ili9341.c
> 4 support rgb-16, rgb-18 interface.
> 5 use optional regulator or power gpio to control panel's power, as panel
> power is always on for my board, so i can't test this part. could i add the
> code which can't be tested?
> 6 support rotation in panel config (currently , i rotate the screen by
> kernel cmdline paramter)
> 
> if you have any other common panel configuration should be add , please
> inform me.
> 
> thanks.
> 
> >
> > Some things to fix, see comments in the follwoing.
> >
> >         Sam
> >
> > >
> > > Signed-off-by: dillon min <dillon.minfei@gmail.com>
> > > ---
> > >  drivers/gpu/drm/panel/Kconfig                |   8 +
> > >  drivers/gpu/drm/panel/Makefile               |   1 +
> > >  drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 561
> > +++++++++++++++++++++++++++
> > >  3 files changed, 570 insertions(+)
> > >  create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> > >
> > > diff --git a/drivers/gpu/drm/panel/Kconfig
> > b/drivers/gpu/drm/panel/Kconfig
> > > index a1723c1..e42692c 100644
> > > --- a/drivers/gpu/drm/panel/Kconfig
> > > +++ b/drivers/gpu/drm/panel/Kconfig
> > > @@ -95,6 +95,14 @@ 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_IL9341
> > ILI9341 - so the config name matches the name of the driver IC.
> >
> > > +     tristate "Ilitek ILI9341 240x320 QVGA panels"
> > > +     depends on OF && SPI
> > > +     select REGMAP
> > > +     help
> > > +       Say Y here if you want to enable support for Ilitek IL9341
> > > +       QVGA (240x320) RGB panels.
> > See comment to the changelog, the driver is more generic - I assume.
> > So the wording here can be improved to express this.
> >
> > Add support RGB 16bits and RGB 18bits bus only ?
> 
> > > +
> > >  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 96a883c..d123543 100644
> > > --- a/drivers/gpu/drm/panel/Makefile
> > > +++ b/drivers/gpu/drm/panel/Makefile
> > > @@ -8,6 +8,7 @@ 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-$(CONFIG_DRM_PANEL_ILITEK_IL9341) += panel-ilitek-ili9341.o
> > >  obj-$(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 0000000..ec22d80
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> > > @@ -0,0 +1,561 @@
> > > +// 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
> > The interface to ILI9341 is SPI, and the interface between the ILI9341
> > and the panel is more of an itnernal thing. Or did I get this worng?
> >
> > SPI is for register configuration.  RGB parallel for data transfer
> 
> > + *
> > > + * 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/regmap.h>
> > > +#include <linux/regulator/consumer.h>
> > > +#include <linux/spi/spi.h>
> > > +
> > > +#include <video/mipi_display.h>
> > > +#include <video/of_videomode.h>
> > > +#include <video/videomode.h>
> > > +
> > > +#include <drm/drm_modes.h>
> > > +#include <drm/drm_panel.h>
> > > +#include <drm/drm_print.h>
> > > +
> > > +#define DEFAULT_SPI_SPEED    10000000
> > > +
> >
> > Please use same case for hex numbers in the driver.
> > My personal preferences is lower-case.
> >
> > in next patch, spi speed will be configured by dts, not hardcode here.
> below register address will change to lower-case hex numbers.
> 
> 
> > > +#define ILI9341_SLEEP_OUT            0x11   /* Sleep out register */
> > > +#define ILI9341_GAMMA                0x26   /* Gamma register */
> > > +#define ILI9341_DISPLAY_OFF          0x28   /* Display off register */
> > > +#define ILI9341_DISPLAY_ON           0x29   /* Display on register */
> > > +#define ILI9341_COLUMN_ADDR          0x2A   /* Colomn address register
> > */
> > > +#define ILI9341_PAGE_ADDR            0x2B   /* Page address register */
> > > +#define ILI9341_GRAM                 0x2C   /* GRAM register */
> > > +#define ILI9341_MAC                  0x36   /* Memory Access Control
> > register*/
> > > +#define ILI9341_PIXEL_FORMAT         0x3A   /* Pixel Format register */
> > > +#define ILI9341_WDB                  0x51   /* Write Brightness Display
> > > +                                          * register
> > > +                                          */
> > > +#define ILI9341_WCD                  0x53   /* Write Control Display
> > > +                                          * register
> > > +                                          */
> > > +#define ILI9341_RGB_INTERFACE        0xB0   /* RGB Interface Signal
> > Control */
> > > +#define ILI9341_FRC                  0xB1   /* Frame Rate Control
> > register */
> > > +#define ILI9341_BPC                  0xB5   /* Blanking Porch 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 */
> > > +
> >
> > All the following should be const.
> >
> ok
> 
> 
> > Can any of the below be replaces by DEFINED constants?
> > > +static u8 ili9341_cmd0[] = {0xc3, 0x08, 0x50};
> > > +static u8 ili9341_powerb[] = {0x00, 0xc1, 0x30};
> > > +static u8 ili9341_power_seq[] = {0x64, 0x03, 0x12, 0x81};
> > > +static u8 ili9341_dtca[] = {0x85, 0x00, 0x78};
> > > +static u8 ili9341_powera[] = {0x39, 0x2c, 0x00, 0x34, 0x02};
> > > +static u8 ili9341_prc[] = {0x20};
> > > +static u8 ili9341_dtcb[] = {0x00, 0x00};
> > > +static u8 ili9341_frc[] = {0x00, 0x1b};
> > > +static u8 ili9341_dfc1[] = {0x0a, 0xa2};
> > > +static u8 ili9341_power1[] = {0x10};
> > > +static u8 ili9341_power2[] = {0x10};
> > > +static u8 ili9341_vcom1[] = {0x45, 0x15};
> > > +static u8 ili9341_vcom2[] = {0x90};
> > > +static u8 ili9341_mac[] = {0xc8};
> > > +static u8 ili9341_gamma_en[] = {0x00};
> > > +static u8 ili9341_rgb_intr[] = {0xc2};
> > > +static u8 ili9341_dfc2[] = {0x0a, 0xa7, 0x27, 0x04};
> > > +static u8 ili9341_column_addr[] = {0x00, 0x00, 0x00, 0xef};
> > > +static u8 ili9341_page_addr[] = {0x00, 0x00, 0x01, 0x3f};
> > > +static u8 ili9341_intr[] = {0x01, 0x00, 0x06};
> > > +static u8 ili9341_gamma[] = {0x01};
> > > +static u8 ili9341_pgamma[] = {0x0f, 0x29, 0x24, 0x0c, 0x0e, 0x09, 0x4e,
> > 0x78,
> > > +                             0x3c, 0x09, 0x13, 0x05, 0x17, 0x11, 0x00};
> > > +static u8 ili9341_ngamma[] = {0x00, 0x16, 0x1b, 0x04, 0x11, 0x07, 0x31,
> > 0x33,
> > > +                             0x42, 0x05, 0x0c, 0x0a, 0x28, 0x2f, 0x0f};
> > > +
> > > +/**
> > > + * enum ili9341_input - the format of the incoming signal to the panel
> > > + *
> > > + * The panel can be connected to various input streams and four of them
> > can
> > > + * be selected by electronic straps on the display. However it is
> > possible
> > > + * to select another mode or override the electronic default with this
> > > + * setting.
> > > + */
> > > +enum ili9341_input {
> > > +     ILI9341_INPUT_PRGB_THROUGH = 0x0,
> > > +     ILI9341_INPUT_PRGB_ALIGNED = 0x1,
> > > +     ILI9341_INPUT_UNKNOWN = 0xf,
> > > +};
> > > +
> > > +/**
> > > + * struct ili9341_config - the system specific ILI9341 configuration
> > > + * @width_mm: physical panel width [mm]
> > > + * @height_mm: physical panel height [mm]
> > > + * @input: the input/entry type used in this system, if this is set to
> > > + * ILI9341_INPUT_UNKNOWN the driver will try to figure it out by probing
> > > + * the hardware
> > > + * @dclk_active_high: data/pixel clock active high, data will be clocked
> > > + * in on the rising edge of the DCLK (this is usually the case).
> > > + * @de_active_high: DE (data entry) is active high
> > > + * @hsync_active_high: HSYNC is active high
> > > + * @vsync_active_high: VSYNC is active high
> > > + */
> > > +struct ili9341_config {
> > > +     u32 width_mm;
> > > +     u32 height_mm;
> > > +     enum ili9341_input input;
> > > +     bool dclk_active_high;
> > > +     bool de_active_high;
> > > +     bool hsync_active_high;
> > > +     bool vsync_active_high;
> > > +};
> > > +
> > > +struct ili9341 {
> > > +     struct device *dev;
> > > +     const struct ili9341_config *conf;
> > > +     struct drm_panel panel;
> > > +     struct regmap *regmap;
> > > +     struct gpio_desc *reset_gpio;
> > > +     struct gpio_desc *dc_gpio;
> > > +     enum ili9341_input input;
> >
> > > +     struct videomode vm;
> > videomode is not used. So drop this field and drop the include files
> > that are no logner needed.
> >
> > ok
> 
> > > +};
> > > +
> > > +static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
> > > +{
> > > +     return container_of(panel, struct ili9341, panel);
> > > +}
> > > +
> > > +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 = {
> > const?
> >
> > ok
> 
> > > +             .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)
> > > +                     return ret;
> > > +     }
> > > +     return 0;
> > > +}
> > > +static int ili9341_regmap_spi_write(void *context, const void *data,
> > > +                                 size_t count)
> > > +{
> > > +     struct device *dev = context;
> > > +     struct spi_device *spi = to_spi_device(dev);
> > > +     struct ili9341 *ili = spi_get_drvdata(spi);
> > > +     int ret = 0;
> > > +
> > > +     gpiod_set_value_cansleep(ili->dc_gpio, 0);
> > > +
> > > +     ret = ili9341_spi_transfer(spi, DEFAULT_SPI_SPEED, 8, data+0, 1);
> > > +     if (ret || count == 1 ||
> > > +                     ((u8 *)data)[0] == ILI9341_GRAM ||
> > > +                     ((u8 *)data)[0] == ILI9341_DISPLAY_ON ||
> > > +                     ((u8 *)data)[0] == ILI9341_SLEEP_OUT ||
> > > +                     ((u8 *)data)[0] == ILI9341_DISPLAY_OFF)
> > > +             return ret;
> > > +
> > > +     gpiod_set_value_cansleep(ili->dc_gpio, 1);
> > > +
> > > +     return ili9341_spi_transfer(spi, DEFAULT_SPI_SPEED, 8, data+1,
> > count-1);
> > > +}
> > > +
> > > +static int ili9341_regmap_spi_read(void *context, const void *reg,
> > > +                                size_t reg_size, void *val, size_t
> > val_size)
> > > +{
> > > +     return 0;
> > > +}
> > Is this function really needed? If not delete it.
> >
> > regmap will be drop in next patch.
> 
> > > +
> > > +static struct regmap_bus ili9341_regmap_bus = {
> > > +     .write = ili9341_regmap_spi_write,
> > > +     .read = ili9341_regmap_spi_read,
> > > +     .reg_format_endian_default = REGMAP_ENDIAN_BIG,
> > > +     .val_format_endian_default = REGMAP_ENDIAN_BIG,
> > > +};
> > > +
> > > +static bool ili9341_volatile_reg(struct device *dev, unsigned int reg)
> > > +{
> > > +     return false;
> > > +}
> > Is this function really nedded? If not delete it.
> >
> > > +
> > > +static bool ili9341_writeable_reg(struct device *dev, unsigned int reg)
> > > +{
> > > +     /* Just register 0 is read-only */
> > > +     if (reg == 0x00)
> > > +             return false;
> > > +     return true;
> > > +}
> > > +
> > > +static const struct regmap_config ili9341_regmap_config = {
> > > +     .reg_bits = 8,
> > > +     .val_bits = 8,
> > > +     .max_register = 0xff,
> > > +     .cache_type = REGCACHE_RBTREE,
> > > +     .volatile_reg = ili9341_volatile_reg,
> > > +     .writeable_reg = ili9341_writeable_reg,
> > > +};
> > > +
> >
> > No error checks - consider something like:
> >
> > static int bulk_write(struct ili9341 *ili, u8 reg, const u8[] data, int
> > len)
> > {
> >         int err = ili->err;
> >
> >         if (!err) {
> >                 err = regmap_bulk_write(ili->regmap, reg, data, len);
> >                 if (err) {
> >                         dev_err(...);
> >                         ili->err = err;
> >                 }
> >         }
> >
> >         return err;
> > }
> >
> > Then you can use this in the following, and make this more readable.
> >
> > ok, thanks for detail guide.
> 
> 
> > > +static int ili9341_init(struct drm_panel *panel, struct ili9341 *ili)
> > > +{
> > > +     regmap_bulk_write(ili->regmap, 0xca,
> > > +                                     ili9341_cmd0,
> > sizeof(ili9341_cmd0));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_POWERB,
> > > +                             ili9341_powerb, sizeof(ili9341_powerb));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_POWER_SEQ,
> > > +                             ili9341_power_seq,
> > sizeof(ili9341_power_seq));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_DTCA,
> > > +                             ili9341_dtca, sizeof(ili9341_dtca));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_POWERA,
> > > +                             ili9341_powera, sizeof(ili9341_powera));
> > > +     regmap_write(ili->regmap, ILI9341_PRC, ili9341_prc[0]);
> > > +     regmap_bulk_write(ili->regmap, ILI9341_DTCB,
> > > +                             ili9341_dtcb, sizeof(ili9341_dtcb));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_FRC,
> > > +                             ili9341_frc, sizeof(ili9341_frc));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_DFC,
> > > +                             ili9341_dfc1, sizeof(ili9341_dfc1));
> > > +     regmap_write(ili->regmap, ILI9341_POWER1, ili9341_power1[0]);
> > > +     regmap_write(ili->regmap, ILI9341_POWER2, ili9341_power2[0]);
> > > +     regmap_bulk_write(ili->regmap, ILI9341_VCOM1,
> > > +                             ili9341_vcom1, sizeof(ili9341_vcom1));
> > > +     regmap_write(ili->regmap, ILI9341_VCOM2, ili9341_vcom2[0]);
> > > +     regmap_write(ili->regmap, ILI9341_MAC, ili9341_mac[0]);
> > > +     regmap_write(ili->regmap, ILI9341_3GAMMA_EN, ili9341_gamma_en[0]);
> > > +     regmap_write(ili->regmap, ILI9341_RGB_INTERFACE,
> > ili9341_rgb_intr[0]);
> > > +     regmap_bulk_write(ili->regmap, ILI9341_DFC,
> > > +                             ili9341_dfc2, sizeof(ili9341_dfc2));
> > > +
> > > +     /* colomn address set */
> > > +     regmap_bulk_write(ili->regmap, ILI9341_COLUMN_ADDR,
> > > +                     ili9341_column_addr, sizeof(ili9341_column_addr));
> > > +
> > > +     /* Page Address Set */
> > > +     regmap_bulk_write(ili->regmap, ILI9341_PAGE_ADDR,
> > > +                             ili9341_page_addr,
> > sizeof(ili9341_page_addr));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_INTERFACE,
> > > +                             ili9341_intr, sizeof(ili9341_intr));
> > > +     regmap_write(ili->regmap, ILI9341_GRAM, 0);
> > > +     msleep(200);
> > > +
> > > +     regmap_write(ili->regmap, ILI9341_GAMMA, ili9341_gamma[0]);
> > > +     regmap_bulk_write(ili->regmap, ILI9341_PGAMMA,
> > > +                             ili9341_pgamma, sizeof(ili9341_pgamma));
> > > +     regmap_bulk_write(ili->regmap, ILI9341_NGAMMA,
> > > +                             ili9341_ngamma, sizeof(ili9341_ngamma));
> > > +     regmap_write(ili->regmap, ILI9341_SLEEP_OUT, 0);
> > > +     msleep(200);
> > > +
> > > +     regmap_write(ili->regmap, ILI9341_DISPLAY_ON, 0);
> > > +
> > > +     /* GRAM start writing */
> > > +     regmap_write(ili->regmap, ILI9341_GRAM, 0);
> > > +
> > > +     dev_info(ili->dev, "initialized display\n");
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +/*
> > > + * This power-on sequence if from the datasheet, page 57.
> > > + */
> > > +static int ili9341_power_on(struct ili9341 *ili)
> > > +{
> > > +     /* Assert RESET */
> > > +     gpiod_set_value(ili->reset_gpio, 1);
> > > +
> > > +     msleep(20);
> > > +
> > > +     /* De-assert RESET */
> > > +     gpiod_set_value(ili->reset_gpio, 0);
> > > +
> > > +     msleep(10);
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static int ili9341_power_off(struct ili9341 *ili)
> > > +{
> >
> >         Assert reset?
> > will add reset-pin control here.
> >
> 
> 
> > > +     return 0;
> > > +}
> > > +
> > > +static int ili9341_disable(struct drm_panel *panel)
> > > +{
> > > +     struct ili9341 *ili = panel_to_ili9341(panel);
> > > +     int ret;
> > > +
> > > +     ret = regmap_write(ili->regmap, ILI9341_DISPLAY_OFF, 0);
> > > +     if (ret) {
> > > +             dev_err(ili->dev, "unable to go to standby mode\n");
> > > +             return ret;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static int ili9341_unprepare(struct drm_panel *panel)
> > > +{
> > > +     struct ili9341 *ili = panel_to_ili9341(panel);
> > > +
> > > +     return ili9341_power_off(ili);
> > > +}
> > > +
> > > +static int ili9341_prepare(struct drm_panel *panel)
> > > +{
> > > +     struct ili9341 *ili = panel_to_ili9341(panel);
> > > +     int ret;
> > > +
> > > +     ret = ili9341_power_on(ili);
> > > +     if (ret < 0)
> > > +             return ret;
> > > +
> > > +     ret = ili9341_init(panel, ili);
> > > +     if (ret < 0)
> > > +             ili9341_unprepare(panel);
> > > +
> > > +     return ret;
> > > +}
> > > +
> > > +static int ili9341_enable(struct drm_panel *panel)
> > > +{
> > > +     struct ili9341 *ili = panel_to_ili9341(panel);
> > > +     int ret;
> > > +
> > > +     ret = regmap_write(ili->regmap, ILI9341_DISPLAY_ON, 0);
> > > +     if (ret) {
> > > +             dev_err(ili->dev, "unable to enable panel\n");
> > > +             return ret;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +/* This is the only mode listed for parallel RGB in the datasheet */
> > > +static const struct drm_display_mode prgb_320x240_mode = {
> > > +     .clock = 6100,
> > > +     .hdisplay = 240,
> > > +     .hsync_start = 240 + 10,
> > > +     .hsync_end = 240 + 10 + 10,
> > > +     .htotal = 280,
> > > +     .vdisplay = 320,
> > > +     .vsync_start = 320 + 4,
> > > +     .vsync_end = 320 + 4 + 2,
> > > +     .vtotal = 328,
> > > +     .vrefresh = 60,
> > > +     .flags = 0,
> > > +};
> > > +
> > > +static int ili9341_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->width_mm;
> > > +     info->height_mm = ili->conf->height_mm;
> > > +     if (ili->conf->dclk_active_high)
> > > +             info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
> > > +     else
> > > +             info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
> > > +
> > > +     if (ili->conf->de_active_high)
> > > +             info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;
> > > +     else
> > > +             info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
> > > +
> > > +     switch (ili->input) {
> > > +     case ILI9341_INPUT_PRGB_THROUGH:
> > > +     case ILI9341_INPUT_PRGB_ALIGNED:
> > > +             mode = drm_mode_duplicate(drm, &prgb_320x240_mode);
> > > +             break;
> > > +     default:
> > > +             mode = NULL;
> > > +             break;
> > > +     }
> > > +     if (!mode) {
> > > +             DRM_ERROR("bad mode or failed to add mode\n");
> > > +             return -EINVAL;
> > > +     }
> > > +     drm_mode_set_name(mode);
> > > +     /*
> > > +      * This is the preferred mode because most people are going
> > > +      * to want to use the display with VGA type graphics.
> > > +      */
> > > +     mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> > > +
> > > +     /* Set up the polarity */
> > > +     if (ili->conf->hsync_active_high)
> > > +             mode->flags |= DRM_MODE_FLAG_PHSYNC;
> > > +     else
> > > +             mode->flags |= DRM_MODE_FLAG_NHSYNC;
> > > +     if (ili->conf->vsync_active_high)
> > > +             mode->flags |= DRM_MODE_FLAG_PVSYNC;
> > > +     else
> > > +             mode->flags |= DRM_MODE_FLAG_NVSYNC;
> > > +
> > > +     mode->width_mm = ili->conf->width_mm;
> > > +     mode->height_mm = ili->conf->height_mm;
> > > +     drm_mode_probed_add(connector, mode);
> > > +
> > > +     return 1; /* Number of modes */
> > > +}
> > > +
> > > +static const struct drm_panel_funcs ili9341_drm_funcs = {
> > > +     .disable = ili9341_disable,
> > > +     .unprepare = ili9341_unprepare,
> > > +     .prepare = ili9341_prepare,
> > > +     .enable = ili9341_enable,
> > > +     .get_modes = ili9341_get_modes,
> > > +};
> > > +
> > > +static int ili9341_probe(struct spi_device *spi)
> > > +{
> > > +     struct device *dev = &spi->dev;
> > > +     struct ili9341 *ili;
> > > +     const struct regmap_config *regmap_config;
> > > +     int ret;
> > > +
> > > +     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->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_optional(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;
> > > +     }
> > > +
> > > +     regmap_config = &ili9341_regmap_config;
> > > +
> > > +     ili->regmap = devm_regmap_init(dev, &ili9341_regmap_bus, dev,
> > > +                                    regmap_config);
> > > +     if (IS_ERR(ili->regmap)) {
> > > +             dev_err(dev, "failed to allocate register map\n");
> > > +             return PTR_ERR(ili->regmap);
> > > +     }
> > > +
> > > +     ili->input = ili->conf->input;
> > > +
> > > +     drm_panel_init(&ili->panel, dev, &ili9341_drm_funcs,
> > > +                    DRM_MODE_CONNECTOR_DPI);
> > > +
> > > +     return drm_panel_add(&ili->panel);
> > > +}
> > > +
> > > +static int ili9341_remove(struct spi_device *spi)
> > > +{
> > > +     struct ili9341 *ili = spi_get_drvdata(spi);
> > > +
> > > +     ili9341_power_off(ili);
> > > +     drm_panel_remove(&ili->panel);
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +/*
> > > + * The Stm32f429-disco board has a panel ili9341 connected to ltdc
> > controller
> > > + */
> > > +static const struct ili9341_config ili9341_data = {
> > This should be named "disco" something as this is m32f429-disco
> > specific.
> >
> > ok
> 
> > > +     .width_mm = 65,
> > > +     .height_mm = 50,
> > > +     .input = ILI9341_INPUT_PRGB_THROUGH,
> > > +     .dclk_active_high = true,
> > > +     .de_active_high = false,
> > > +     .hsync_active_high = false,
> > > +     .vsync_active_high = false,
> > > +};
> > > +
> > > +static const struct of_device_id ili9341_of_match[] = {
> > > +     {
> > > +             .compatible = "stm32f429,ltdc-panel",
> > > +             .data = &ili9341_data,
> > > +     },
> >
> >
> > > +     {
> > > +             .compatible = "ilitek,ili9341",
> > > +             .data = NULL,
> > This part is wrong, as ilitek,ili9341 is just the generic part.
> > Only the first entry is relevant.
> >
> >
> > ok
> 
> > > +     },
> > > +     { }
> > > +};
> > > +MODULE_DEVICE_TABLE(of, ili9341_of_match);
> > > +
> > > +static struct spi_driver ili9341_driver = {
> > > +     .probe = ili9341_probe,
> > > +     .remove = ili9341_remove,
> > > +     .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");
> > > --
> > > 2.7.4
> >

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