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Date: Fri, 21 Jun 2013 20:49:21 +0200
From: Maxime Ripard <maxime.ripard@...e-electrons.com>
To: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc: linux-fbdev@...r.kernel.org,
Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
jimwall@...om, brian@...stalfontz.com,
linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>,
Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: Re: [PATCH 2/2] fb: backlight: HX8357: Add HX8369 support
Hi Alex,
On Fri, Jun 21, 2013 at 08:27:39PM +0200, Alexandre Belloni wrote:
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> ---
> drivers/video/backlight/hx8357.c | 183 +++++++++++++++++++++++++++++++++++++--
> 1 file changed, 175 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/video/backlight/hx8357.c b/drivers/video/backlight/hx8357.c
> index 69f5672..b1c4042 100644
> --- a/drivers/video/backlight/hx8357.c
> +++ b/drivers/video/backlight/hx8357.c
> @@ -71,6 +71,18 @@
> #define HX8357_SET_POWER_NORMAL 0xd2
> #define HX8357_SET_PANEL_RELATED 0xe9
>
> +#define HX8369_SET_DISPLAY_BRIGHTNESS 0x51
> +#define HX8369_WRITE_CABC_DISPLAY_VALUE 0x53
> +#define HX8369_WRITE_CABC_BRIGHT_CTRL 0x55
> +#define HX8369_WRITE_CABC_MIN_BRIGHTNESS 0x5e
> +#define HX8369_SET_POWER 0xb1
> +#define HX8369_SET_DISPLAY_MODE 0xb2
> +#define HX8369_SET_DISPLAY_WAVEFORM_CYC 0xb4
> +#define HX8369_SET_VCOM 0xb6
> +#define HX8369_SET_EXTENSION_COMMAND 0xb9
> +#define HX8369_SET_GIP 0xd5
> +#define HX8369_SET_GAMMA_CURVE_RELATED 0xe0
> +
> struct hx8357_data {
> unsigned im_pins[HX8357_NUM_IM_PINS];
> unsigned reset;
> @@ -144,6 +156,61 @@ static u8 hx8357_seq_display_mode[] = {
> HX8357_SET_DISPLAY_MODE_RGB_INTERFACE,
> };
>
> +static u8 hx8369_seq_write_CABC_min_brightness[] = {
> + HX8369_WRITE_CABC_MIN_BRIGHTNESS, 0x00,
> +};
> +
> +static u8 hx8369_seq_write_CABC_control[] = {
> + HX8369_WRITE_CABC_DISPLAY_VALUE, 0x24,
> +};
> +
> +static u8 hx8369_seq_set_display_brightness[] = {
> + HX8369_SET_DISPLAY_BRIGHTNESS, 0xFF,
> +};
> +
> +static u8 hx8369_seq_write_CABC_control_setting[] = {
> + HX8369_WRITE_CABC_BRIGHT_CTRL, 0x02,
> +};
> +
> +static u8 hx8369_seq_extension_command[] = {
> + HX8369_SET_EXTENSION_COMMAND, 0xff, 0x83, 0x69,
> +};
> +
> +static u8 hx8369_seq_display_related[] = {
> + HX8369_SET_DISPLAY_MODE, 0x00, 0x2b, 0x03, 0x03, 0x70, 0x00,
> + 0xff, 0x00, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x01,
> +};
> +
> +static u8 hx8369_seq_panel_waveform_cycle[] = {
> + HX8369_SET_DISPLAY_WAVEFORM_CYC, 0x0a, 0x1d, 0x80, 0x06, 0x02,
> +};
> +
> +static u8 hx8369_seq_set_address_mode[] = {
> + HX8357_SET_ADDRESS_MODE, 0x00,
> +};
> +
> +static u8 hx8369_seq_vcom[] = {
> + HX8369_SET_VCOM, 0x3e, 0x3e,
> +};
> +
> +static u8 hx8369_seq_gip[] = {
> + HX8369_SET_GIP, 0x00, 0x01, 0x03, 0x25, 0x01, 0x02, 0x28, 0x70,
> + 0x11, 0x13, 0x00, 0x00, 0x40, 0x26, 0x51, 0x37, 0x00, 0x00, 0x71,
> + 0x35, 0x60, 0x24, 0x07, 0x0f, 0x04, 0x04,
> +};
> +
> +static u8 hx8369_seq_power[] = {
> + HX8369_SET_POWER, 0x01, 0x00, 0x34, 0x03, 0x00, 0x11, 0x11, 0x32,
> + 0x2f, 0x3f, 0x3f, 0x01, 0x3a, 0x01, 0xe6, 0xe6, 0xe6, 0xe6, 0xe6,
> +};
> +
> +static u8 hx8369_seq_gamma_curve_related[] = {
> + HX8369_SET_GAMMA_CURVE_RELATED, 0x00, 0x0d, 0x19, 0x2f, 0x3b, 0x3d,
> + 0x2e, 0x4a, 0x08, 0x0e, 0x0f, 0x14, 0x16, 0x14, 0x14, 0x14, 0x1e,
> + 0x00, 0x0d, 0x19, 0x2f, 0x3b, 0x3d, 0x2e, 0x4a, 0x08, 0x0e, 0x0f,
> + 0x14, 0x16, 0x14, 0x14, 0x14, 0x1e,
> +};
> +
> static int hx8357_spi_write_then_read(struct lcd_device *lcdev,
> u8 *txbuf, u16 txlen,
> u8 *rxbuf, u16 rxlen)
> @@ -242,6 +309,16 @@ static int hx8357_exit_standby(struct lcd_device *lcdev)
> return 0;
> }
>
> +static void hx8357_lcd_reset(struct hx8357_data *lcd)
> +{
> + gpio_set_value(lcd->reset, 1);
> + usleep_range(10000, 12000);
> + gpio_set_value(lcd->reset, 0);
> + usleep_range(10000, 12000);
> + gpio_set_value(lcd->reset, 1);
> + msleep(120);
> +}
We should probably use the new reset framework here, especially
reset-gpio (I'm not sure what's the current status of the patch though).
> +
> static int hx8357_lcd_init(struct lcd_device *lcdev)
> {
> struct hx8357_data *lcd = lcd_get_data(lcdev);
> @@ -257,13 +334,7 @@ static int hx8357_lcd_init(struct lcd_device *lcdev)
> gpio_set_value_cansleep(lcd->im_pins[2], 1);
> }
>
> - /* Reset the screen */
> - gpio_set_value(lcd->reset, 1);
> - usleep_range(10000, 12000);
> - gpio_set_value(lcd->reset, 0);
> - usleep_range(10000, 12000);
> - gpio_set_value(lcd->reset, 1);
> - msleep(120);
> + hx8357_lcd_reset(lcd);
And that would become reset_device_reset
> ret = hx8357_spi_write_array(lcdev, hx8357_seq_power,
> ARRAY_SIZE(hx8357_seq_power));
> @@ -359,6 +430,97 @@ static int hx8357_lcd_init(struct lcd_device *lcdev)
> return 0;
> }
>
> +static int hx8369_lcd_init(struct lcd_device *lcdev)
> +{
> + struct hx8357_data *lcd = lcd_get_data(lcdev);
> + int ret;
> +
> + hx8357_lcd_reset(lcd);
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_extension_command,
> + ARRAY_SIZE(hx8369_seq_extension_command));
> + if (ret < 0)
> + return ret;
> + usleep_range(10000, 12000);
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_display_related,
> + ARRAY_SIZE(hx8369_seq_display_related));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_panel_waveform_cycle,
> + ARRAY_SIZE(hx8369_seq_panel_waveform_cycle));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_set_address_mode,
> + ARRAY_SIZE(hx8369_seq_set_address_mode));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_vcom,
> + ARRAY_SIZE(hx8369_seq_vcom));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_gip,
> + ARRAY_SIZE(hx8369_seq_gip));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_power,
> + ARRAY_SIZE(hx8369_seq_power));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_byte(lcdev, HX8357_EXIT_SLEEP_MODE);
> + if (ret < 0)
> + return ret;
> +
> + msleep(120);
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_gamma_curve_related,
> + ARRAY_SIZE(hx8369_seq_gamma_curve_related));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_byte(lcdev, HX8357_EXIT_SLEEP_MODE);
> + if (ret < 0)
> + return ret;
> + usleep_range(1000, 1200);
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_write_CABC_control,
> + ARRAY_SIZE(hx8369_seq_write_CABC_control));
> + if (ret < 0)
> + return ret;
> + usleep_range(10000, 12000);
> +
> + ret = hx8357_spi_write_array(lcdev,
> + hx8369_seq_write_CABC_control_setting,
> + ARRAY_SIZE(hx8369_seq_write_CABC_control_setting));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_array(lcdev,
> + hx8369_seq_write_CABC_min_brightness,
> + ARRAY_SIZE(hx8369_seq_write_CABC_min_brightness));
> + if (ret < 0)
> + return ret;
> + usleep_range(10000, 12000);
> +
> + ret = hx8357_spi_write_array(lcdev, hx8369_seq_set_display_brightness,
> + ARRAY_SIZE(hx8369_seq_set_display_brightness));
> + if (ret < 0)
> + return ret;
> +
> + ret = hx8357_spi_write_byte(lcdev, HX8357_SET_DISPLAY_ON);
> + if (ret < 0)
> + return ret;
> + msleep(100);
> +
> + return 0;
> +}
> +
> #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
>
> static int hx8357_set_power(struct lcd_device *lcdev, int power)
> @@ -461,7 +623,11 @@ static int hx8357_probe(struct spi_device *spi)
> }
> spi_set_drvdata(spi, lcdev);
>
> - ret = hx8357_lcd_init(lcdev);
> + ret = -ENODEV;
> + if (of_device_is_compatible(spi->dev.of_node, "himax,hx8357"))
> + ret = hx8357_lcd_init(lcdev);
> + else if (of_device_is_compatible(spi->dev.of_node, "himax,hx8369"))
> + ret = hx8369_lcd_init(lcdev);
> if (ret) {
> dev_err(&spi->dev, "Couldn't initialize panel\n");
> goto init_error;
> @@ -486,6 +652,7 @@ static int hx8357_remove(struct spi_device *spi)
>
> static const struct of_device_id hx8357_dt_ids[] = {
> { .compatible = "himax,hx8357" },
> + { .compatible = "himax,hx8369" },
Maybe you could use the .data field and of_match_device here.
> {},
> };
> MODULE_DEVICE_TABLE(of, hx8357_dt_ids);
> --
> 1.8.1.2
>
Thanks,
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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