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Date:   Thu, 5 Apr 2018 17:04:24 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Felix Brack <fb@...c.ch>, linux-fbdev@...r.kernel.org
Cc:     lee.jones@...aro.org, jingoohan1@...il.com,
        b.zolnierkie@...sung.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] backlight: otm3225a: add support for ORISE OTM3225A
 LCD SoC

On 27/12/17 15:20, Felix Brack wrote:
> This patch adds a LCD driver supporting the OTM3225A LCD SoC
> from ORISE Technology. This device can drive TFT LC panels having a
> resolution of 240x320 pixels. After initializing the OTM3225A using
> it's SPI interface it switches to use 16-bib RGB as external
> display interface.
> 
> Signed-off-by: Felix Brack <fb@...c.ch>

Many apologies for the slow review.


> Changes in v2:
> - use descriptive names for registers instead of hard coding them
> - remove unnecessary registers in initialization sequence
> - make use of resource-managed functions like devm_kzalloc()
>    instead of kzalloc() which simplifies and shortens the code
> - replace mdelay() by msleep()
> - use module_spi_init() since we do not do anything special
>    in init/exit
> - use dev_name() instead of hard coding driver name multiple times
> - use static storage class for structure otm3225a_ops
> - sort include files alphabetically
> - use standardized licensing header
> - modify Makefile respecting alphabetical sort order
> ---
>   drivers/video/backlight/Kconfig    |   7 ++
>   drivers/video/backlight/Makefile   |   1 +
>   drivers/video/backlight/otm3225a.c | 251 +++++++++++++++++++++++++++++++++++++
>   3 files changed, 259 insertions(+)
>   create mode 100644 drivers/video/backlight/otm3225a.c
> 
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 4e1d2ad..06e187b 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -150,6 +150,13 @@ config LCD_HX8357
>   	  If you have a HX-8357 LCD panel, say Y to enable its LCD control
>   	  driver.
>   
> +  config LCD_OTM3225A
> +  	tristate "ORISE Technology OTM3225A support"
> +  	depends on SPI
> +  	help
> +  	  If you have a panel based on the OTM3225A controller
> +  	  chip then say y to include a driver for it.
> +
>   endif # LCD_CLASS_DEVICE
>   
>   #
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index 8905129..2473377 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_LCD_LD9040)		+= ld9040.o
>   obj-$(CONFIG_LCD_LMS283GF05)		+= lms283gf05.o
>   obj-$(CONFIG_LCD_LMS501KF03)		+= lms501kf03.o
>   obj-$(CONFIG_LCD_LTV350QV)		+= ltv350qv.o
> +obj-$(CONFIG_LCD_OTM3225A)		+= otm3225a.o
>   obj-$(CONFIG_LCD_PLATFORM)		+= platform_lcd.o
>   obj-$(CONFIG_LCD_S6E63M0)		+= s6e63m0.o
>   obj-$(CONFIG_LCD_TDO24M)		+= tdo24m.o
> diff --git a/drivers/video/backlight/otm3225a.c b/drivers/video/backlight/otm3225a.c
> new file mode 100644
> index 0000000..cb1df6c
> --- /dev/null
> +++ b/drivers/video/backlight/otm3225a.c
> @@ -0,0 +1,251 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Driver for ORISE Technology OTM3225A SOC for TFT LCD
> + * Copyright (C) 2017, EETS GmbH, Felix Brack <fb@...c.ch>
> + *
> + * This driver implements a lcd device for the ORISE OTM3225A display
> + * controller. The control interface to the display is SPI and the display's
> + * memory is updated over the 16-bit RGB interface.
> + * The main source of information for writing this driver was provided by the
> + * OTM3225A datasheet from ORISE Technology. Some information arise from the
> + * ILI9328 datasheet from ILITEK as well as from the datasheets and sample code
> + * provided by Crystalfontz America Inc. who sells the CFAF240320A-032T, a 3.2"
> + * TFT LC display using the OTM3225A controller.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/lcd.h>
> +#include <linux/module.h>
> +#include <linux/spi/spi.h>
> +
> +#define OTM3225A_INDEX_REG	0x70
> +#define OTM3225A_DATA_REG	0x72
> +
> +/* instruncton register list */

Spelling error.


> +#define DRIVER_OUTPUT_CTRL_1	0x01
> +#define DRIVER_WAVEFORM_CTRL	0x02
> +#define ENTRY_MODE		0x03
> +#define SCALING_CTRL		0x04
> +#define DISPLAY_CTRL_1		0x07
> +#define DISPLAY_CTRL_2		0x08
> +#define DISPLAY_CTRL_3		0x09
> +#define FRAME_CYCLE_CTRL	0x0A
> +#define EXT_DISP_IFACE_CTRL_1	0x0C
> +#define FRAME_MAKER_POS		0x0D
> +#define EXT_DISP_IFACE_CTRL_2	0x0F
> +#define POWER_CTRL_1		0x10
> +#define POWER_CTRL_2		0x11
> +#define POWER_CTRL_3		0x12
> +#define POWER_CTRL_4		0x13
> +#define GRAM_ADDR_HORIZ_SET	0x20
> +#define GRAM_ADDR_VERT_SET	0x21
> +#define GRAM_READ_WRITE		0x22
> +#define POWER_CTRL_7		0x29
> +#define FRAME_RATE_CTRL		0x2B
> +#define GAMMA_CTRL_1		0x30
> +#define GAMMA_CTRL_2		0x31
> +#define GAMMA_CTRL_3		0x32
> +#define GAMMA_CTRL_4		0x35
> +#define GAMMA_CTRL_5		0x36
> +#define GAMMA_CTRL_6		0x37
> +#define GAMMA_CTRL_7		0x38
> +#define GAMMA_CTRL_8		0x39
> +#define GAMMA_CTRL_9		0x3C
> +#define GAMMA_CTRL_10		0x3D
> +#define WINDOW_HORIZ_RAM_START	0x50
> +#define WINDOW_HORIZ_RAM_END	0x51
> +#define WINDOW_VERT_RAM_START	0x52
> +#define WINDOW_VERT_RAM_END	0x53
> +#define DRIVER_OUTPUT_CTRL_2	0x60
> +#define BASE_IMG_DISPLAY_CTRL	0x61
> +#define VERT_SCROLL_CTRL	0x6A
> +#define PD1_DISPLAY_POS		0x80
> +#define PD1_RAM_START		0x81
> +#define PD1_RAM_END		0x82
> +#define PD2_DISPLAY_POS		0x83
> +#define PD2_RAM_START		0x84
> +#define PD2_RAM_END		0x85
> +#define PANEL_IFACE_CTRL_1	0x90
> +#define PANEL_IFACE_CTRL_2	0x92
> +#define PANEL_IFACE_CTRL_4	0x95
> +#define PANEL_IFACE_CTRL_5	0x97
> +
> +struct otm3225a_data {
> +	struct spi_device *spi;
> +	struct lcd_device *ld;
> +	int power;
> +};
> +
> +struct otm3225a_spi_instruction {
> +	unsigned char reg;	/* register to write */
> +	unsigned short value;	/* data to write to 'reg' */
> +	unsigned short delay;	/* delay in ms after write */
> +};
> +
> +static struct otm3225a_spi_instruction display_init[] = {
> +	{ DRIVER_OUTPUT_CTRL_1,		0x0000, 0 },
> +	{ DRIVER_WAVEFORM_CTRL,		0x0700, 0 },
> +	{ ENTRY_MODE,			0x50A0, 0 },
> +	{ SCALING_CTRL,			0x0000, 0 },
> +	{ DISPLAY_CTRL_2,		0x0606, 0 },
> +	{ DISPLAY_CTRL_3,		0x0000, 0 },
> +	{ FRAME_CYCLE_CTRL,		0x0000, 0 },
> +	{ EXT_DISP_IFACE_CTRL_1,	0x0000, 0 },
> +	{ FRAME_MAKER_POS,		0x0000, 0 },
> +	{ EXT_DISP_IFACE_CTRL_2,	0x0002, 0 },
> +	{ POWER_CTRL_2,			0x0007, 0 },
> +	{ POWER_CTRL_3,			0x0000, 0 },
> +	{ POWER_CTRL_4,			0x0000, 200 },
> +	{ DISPLAY_CTRL_1,		0x0101, 0 },
> +	{ POWER_CTRL_1,			0x12B0, 0 },
> +	{ POWER_CTRL_2,			0x0007, 0 },
> +	{ POWER_CTRL_3,			0x01BB, 50 },
> +	{ POWER_CTRL_4,			0x0013, 0 },
> +	{ POWER_CTRL_7,			0x0010, 50 },
> +	{ GAMMA_CTRL_1,			0x000A, 0 },
> +	{ GAMMA_CTRL_2,			0x1326, 0 },
> +	{ GAMMA_CTRL_3,			0x0A29, 0 },
> +	{ GAMMA_CTRL_4,			0x0A0A, 0 },
> +	{ GAMMA_CTRL_5,			0x1E03, 0 },
> +	{ GAMMA_CTRL_6,			0x031E, 0 },
> +	{ GAMMA_CTRL_7,			0x0706, 0 },
> +	{ GAMMA_CTRL_8,			0x0303, 0 },
> +	{ GAMMA_CTRL_9,			0x010E, 0 },
> +	{ GAMMA_CTRL_10,		0x040E, 0 },
> +	{ WINDOW_HORIZ_RAM_START,	0x0000, 0 },
> +	{ WINDOW_HORIZ_RAM_END,		0x00EF, 0 },
> +	{ WINDOW_VERT_RAM_START,	0x0000, 0 },
> +	{ WINDOW_VERT_RAM_END,		0x013F, 0 },
> +	{ DRIVER_OUTPUT_CTRL_2,		0x2700, 0 },
> +	{ BASE_IMG_DISPLAY_CTRL,	0x0001, 0 },
> +	{ VERT_SCROLL_CTRL,		0x0000, 0 },
> +	{ PD1_DISPLAY_POS,		0x0000, 0 },
> +	{ PD1_RAM_START,		0x0000, 0 },
> +	{ PD1_RAM_END,			0x0000, 0 },
> +	{ PD2_DISPLAY_POS,		0x0000, 0 },
> +	{ PD2_RAM_START,		0x0000, 0 },
> +	{ PD2_RAM_END,			0x0000, 0 },
> +	{ PANEL_IFACE_CTRL_1,		0x0010, 0 },
> +	{ PANEL_IFACE_CTRL_2,		0x0000, 0 },
> +	{ PANEL_IFACE_CTRL_4,		0x0210, 0 },
> +	{ PANEL_IFACE_CTRL_5,		0x0000, 0 },
> +	{ DISPLAY_CTRL_1,		0x0133, 0 },
> +};
> +
> +static struct otm3225a_spi_instruction display_enable_rgb_interface[] = {
> +	{ ENTRY_MODE,			0x1080, 0 },
> +	{ GRAM_ADDR_HORIZ_SET,		0x0000, 0 },
> +	{ GRAM_ADDR_VERT_SET,		0x0000, 0 },
> +	{ EXT_DISP_IFACE_CTRL_1,	0x0111, 500 },
> +};
> +
> +static struct otm3225a_spi_instruction display_off[] = {
> +	{ DISPLAY_CTRL_1,	0x0131, 100 },
> +	{ DISPLAY_CTRL_1,	0x0130, 100 },
> +	{ DISPLAY_CTRL_1,	0x0100, 0 },
> +	{ POWER_CTRL_1,		0x0280, 0 },
> +	{ POWER_CTRL_3,		0x018B, 0 },
> +};
> +
> +static struct otm3225a_spi_instruction display_on[] = {
> +	{ POWER_CTRL_1,		0x1280, 0 },
> +	{ DISPLAY_CTRL_1,	0x0101, 100 },
> +	{ DISPLAY_CTRL_1,	0x0121, 0 },
> +	{ DISPLAY_CTRL_1,	0x0123, 100 },
> +	{ DISPLAY_CTRL_1,	0x0133, 10 },
> +};
> +
> +static void otm3225a_write(struct spi_device *spi,
> +			   struct otm3225a_spi_instruction *instruction,
> +			   unsigned int count)
> +{
> +	unsigned char buf[3];
> +
> +	while (count--) {
> +		/* address register using index register */
> +		buf[0] = OTM3225A_INDEX_REG;
> +		buf[1] = 0x00;
> +		buf[2] = instruction->reg;
> +		spi_write(spi, buf, 3);
> +
> +		/* write data to addressed register */
> +		buf[0] = OTM3225A_DATA_REG;
> +		buf[1] = (instruction->value >> 8) & 0xff;
> +		buf[2] = instruction->value & 0xff;
> +		spi_write(spi, buf, 3);
> +
> +		/* execute delay if any */
> +		msleep(instruction->delay);

Shouldn't this be:

                 if (instruction->delay)
			msleep(instruction->delay);

msleep(0) will still deschedule...

If these are fixed in v3 then feel free to add my:
Acked-by: Daniel Thompson <daniel.thompson@...aro.org>


> +		instruction++;
> +	}
> +}
> +
> +static int otm3225a_set_power(struct lcd_device *ld, int power)
> +{
> +	struct otm3225a_data *dd = lcd_get_data(ld);
> +
> +	if (power == dd->power)
> +		return 0;
> +
> +	if (power > FB_BLANK_UNBLANK)
> +		otm3225a_write(dd->spi, display_off, ARRAY_SIZE(display_off));
> +	else
> +		otm3225a_write(dd->spi, display_on, ARRAY_SIZE(display_on));
> +	dd->power = power;
> +
> +	return 0;
> +}
> +
> +static int otm3225a_get_power(struct lcd_device *ld)
> +{
> +	struct otm3225a_data *dd = lcd_get_data(ld);
> +
> +	return dd->power;
> +}
> +
> +static struct lcd_ops otm3225a_ops = {
> +	.set_power = otm3225a_set_power,
> +	.get_power = otm3225a_get_power,
> +};
> +
> +static int otm3225a_probe(struct spi_device *spi)
> +{
> +	struct otm3225a_data *dd;
> +	struct lcd_device *ld;
> +	struct device *dev = &spi->dev;
> +
> +	dd = devm_kzalloc(dev, sizeof(struct otm3225a_data), GFP_KERNEL);
> +	if (dd == NULL)
> +		return -ENOMEM;
> +
> +	ld = devm_lcd_device_register(dev, dev_name(dev), dev, dd,
> +				      &otm3225a_ops);
> +	if (IS_ERR(ld))
> +		return PTR_ERR(ld);
> +
> +	dd->spi = spi;
> +	dd->ld = ld;
> +	dev_set_drvdata(dev, dd);
> +
> +	dev_info(dev, "Initializing and switching to RGB interface");
> +	otm3225a_write(spi, display_init, ARRAY_SIZE(display_init));
> +	otm3225a_write(spi, display_enable_rgb_interface,
> +		       ARRAY_SIZE(display_enable_rgb_interface));
> +	return 0;
> +}
> +
> +static struct spi_driver otm3225a_driver = {
> +	.driver = {
> +		.name = "otm3225a",
> +		.owner = THIS_MODULE,
> +	},
> +	.probe = otm3225a_probe,
> +};
> +
> +module_spi_driver(otm3225a_driver);
> +
> +MODULE_AUTHOR("Felix Brack <fb@...c.ch>");
> +MODULE_DESCRIPTION("OTM3225A TFT LCD driver");
> +MODULE_VERSION("1.0.0");
> +MODULE_LICENSE("GPL v2");
> 

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