diff options
Diffstat (limited to 'drivers/gpu/drm/panel/panel-sony-acx424akp.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-sony-acx424akp.c | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-sony-acx424akp.c b/drivers/gpu/drm/panel/panel-sony-acx424akp.c new file mode 100644 index 000000000..95659a4d1 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-sony-acx424akp.c @@ -0,0 +1,520 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * MIPI-DSI Sony ACX424AKP panel driver. This is a 480x864 + * AMOLED panel with a command-only DSI interface. + * + * Copyright (C) Linaro Ltd. 2019 + * Author: Linus Walleij + * Based on code and know-how from Marcus Lorentzon + * Copyright (C) ST-Ericsson SA 2010 + */ +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/regulator/consumer.h> + +#include <video/mipi_display.h> + +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_modes.h> +#include <drm/drm_panel.h> + +#define ACX424_DCS_READ_ID1 0xDA +#define ACX424_DCS_READ_ID2 0xDB +#define ACX424_DCS_READ_ID3 0xDC +#define ACX424_DCS_SET_MDDI 0xAE + +/* + * Sony seems to use vendor ID 0x81 + */ +#define DISPLAY_SONY_ACX424AKP_ID1 0x811b +#define DISPLAY_SONY_ACX424AKP_ID2 0x811a +/* + * The third ID looks like a bug, vendor IDs begin at 0x80 + * and panel 00 ... seems like default values. + */ +#define DISPLAY_SONY_ACX424AKP_ID3 0x8000 + +struct acx424akp { + struct drm_panel panel; + struct device *dev; + struct backlight_device *bl; + struct regulator *supply; + struct gpio_desc *reset_gpio; + bool video_mode; +}; + +static const struct drm_display_mode sony_acx424akp_vid_mode = { + .clock = 27234, + .hdisplay = 480, + .hsync_start = 480 + 15, + .hsync_end = 480 + 15 + 0, + .htotal = 480 + 15 + 0 + 15, + .vdisplay = 864, + .vsync_start = 864 + 14, + .vsync_end = 864 + 14 + 1, + .vtotal = 864 + 14 + 1 + 11, + .width_mm = 48, + .height_mm = 84, + .flags = DRM_MODE_FLAG_PVSYNC, +}; + +/* + * The timings are not very helpful as the display is used in + * command mode using the maximum HS frequency. + */ +static const struct drm_display_mode sony_acx424akp_cmd_mode = { + .clock = 35478, + .hdisplay = 480, + .hsync_start = 480 + 154, + .hsync_end = 480 + 154 + 16, + .htotal = 480 + 154 + 16 + 32, + .vdisplay = 864, + .vsync_start = 864 + 1, + .vsync_end = 864 + 1 + 1, + .vtotal = 864 + 1 + 1 + 1, + /* + * Some desired refresh rate, experiments at the maximum "pixel" + * clock speed (HS clock 420 MHz) yields around 117Hz. + */ + .width_mm = 48, + .height_mm = 84, +}; + +static inline struct acx424akp *panel_to_acx424akp(struct drm_panel *panel) +{ + return container_of(panel, struct acx424akp, panel); +} + +#define FOSC 20 /* 20Mhz */ +#define SCALE_FACTOR_NS_DIV_MHZ 1000 + +static int acx424akp_set_brightness(struct backlight_device *bl) +{ + struct acx424akp *acx = bl_get_data(bl); + struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev); + int period_ns = 1023; + int duty_ns = bl->props.brightness; + u8 pwm_ratio; + u8 pwm_div; + u8 par; + int ret; + + /* Calculate the PWM duty cycle in n/256's */ + pwm_ratio = max(((duty_ns * 256) / period_ns) - 1, 1); + pwm_div = max(1, + ((FOSC * period_ns) / 256) / + SCALE_FACTOR_NS_DIV_MHZ); + + /* Set up PWM dutycycle ONE byte (differs from the standard) */ + dev_dbg(acx->dev, "calculated duty cycle %02x\n", pwm_ratio); + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, + &pwm_ratio, 1); + if (ret < 0) { + dev_err(acx->dev, "failed to set display PWM ratio (%d)\n", ret); + return ret; + } + + /* + * Sequence to write PWMDIV: + * address data + * 0xF3 0xAA CMD2 Unlock + * 0x00 0x01 Enter CMD2 page 0 + * 0X7D 0x01 No reload MTP of CMD2 P1 + * 0x22 PWMDIV + * 0x7F 0xAA CMD2 page 1 lock + */ + par = 0xaa; + ret = mipi_dsi_dcs_write(dsi, 0xf3, &par, 1); + if (ret < 0) { + dev_err(acx->dev, "failed to unlock CMD 2 (%d)\n", ret); + return ret; + } + par = 0x01; + ret = mipi_dsi_dcs_write(dsi, 0x00, &par, 1); + if (ret < 0) { + dev_err(acx->dev, "failed to enter page 1 (%d)\n", ret); + return ret; + } + par = 0x01; + ret = mipi_dsi_dcs_write(dsi, 0x7d, &par, 1); + if (ret < 0) { + dev_err(acx->dev, "failed to disable MTP reload (%d)\n", ret); + return ret; + } + ret = mipi_dsi_dcs_write(dsi, 0x22, &pwm_div, 1); + if (ret < 0) { + dev_err(acx->dev, "failed to set PWM divisor (%d)\n", ret); + return ret; + } + par = 0xaa; + ret = mipi_dsi_dcs_write(dsi, 0x7f, &par, 1); + if (ret < 0) { + dev_err(acx->dev, "failed to lock CMD 2 (%d)\n", ret); + return ret; + } + + /* Enable backlight */ + par = 0x24; + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, + &par, 1); + if (ret < 0) { + dev_err(acx->dev, "failed to enable display backlight (%d)\n", ret); + return ret; + } + + return 0; +} + +static const struct backlight_ops acx424akp_bl_ops = { + .update_status = acx424akp_set_brightness, +}; + +static int acx424akp_read_id(struct acx424akp *acx) +{ + struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev); + u8 vendor, version, panel; + u16 val; + int ret; + + ret = mipi_dsi_dcs_read(dsi, ACX424_DCS_READ_ID1, &vendor, 1); + if (ret < 0) { + dev_err(acx->dev, "could not vendor ID byte\n"); + return ret; + } + ret = mipi_dsi_dcs_read(dsi, ACX424_DCS_READ_ID2, &version, 1); + if (ret < 0) { + dev_err(acx->dev, "could not read device version byte\n"); + return ret; + } + ret = mipi_dsi_dcs_read(dsi, ACX424_DCS_READ_ID3, &panel, 1); + if (ret < 0) { + dev_err(acx->dev, "could not read panel ID byte\n"); + return ret; + } + + if (vendor == 0x00) { + dev_err(acx->dev, "device vendor ID is zero\n"); + return -ENODEV; + } + + val = (vendor << 8) | panel; + switch (val) { + case DISPLAY_SONY_ACX424AKP_ID1: + case DISPLAY_SONY_ACX424AKP_ID2: + case DISPLAY_SONY_ACX424AKP_ID3: + dev_info(acx->dev, "MTP vendor: %02x, version: %02x, panel: %02x\n", + vendor, version, panel); + break; + default: + dev_info(acx->dev, "unknown vendor: %02x, version: %02x, panel: %02x\n", + vendor, version, panel); + break; + } + + return 0; +} + +static int acx424akp_power_on(struct acx424akp *acx) +{ + int ret; + + ret = regulator_enable(acx->supply); + if (ret) { + dev_err(acx->dev, "failed to enable supply (%d)\n", ret); + return ret; + } + + /* Assert RESET */ + gpiod_set_value_cansleep(acx->reset_gpio, 1); + udelay(20); + /* De-assert RESET */ + gpiod_set_value_cansleep(acx->reset_gpio, 0); + usleep_range(11000, 20000); + + return 0; +} + +static void acx424akp_power_off(struct acx424akp *acx) +{ + /* Assert RESET */ + gpiod_set_value_cansleep(acx->reset_gpio, 1); + usleep_range(11000, 20000); + + regulator_disable(acx->supply); +} + +static int acx424akp_prepare(struct drm_panel *panel) +{ + struct acx424akp *acx = panel_to_acx424akp(panel); + struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev); + const u8 mddi = 3; + int ret; + + ret = acx424akp_power_on(acx); + if (ret) + return ret; + + ret = acx424akp_read_id(acx); + if (ret) { + dev_err(acx->dev, "failed to read panel ID (%d)\n", ret); + goto err_power_off; + } + + /* Enabe tearing mode: send TE (tearing effect) at VBLANK */ + ret = mipi_dsi_dcs_set_tear_on(dsi, + MIPI_DSI_DCS_TEAR_MODE_VBLANK); + if (ret) { + dev_err(acx->dev, "failed to enable vblank TE (%d)\n", ret); + goto err_power_off; + } + + /* + * Set MDDI + * + * This presumably deactivates the Qualcomm MDDI interface and + * selects DSI, similar code is found in other drivers such as the + * Sharp LS043T1LE01 which makes us suspect that this panel may be + * using a Novatek NT35565 or similar display driver chip that shares + * this command. Due to the lack of documentation we cannot know for + * sure. + */ + ret = mipi_dsi_dcs_write(dsi, ACX424_DCS_SET_MDDI, + &mddi, sizeof(mddi)); + if (ret < 0) { + dev_err(acx->dev, "failed to set MDDI (%d)\n", ret); + goto err_power_off; + } + + /* Exit sleep mode */ + ret = mipi_dsi_dcs_exit_sleep_mode(dsi); + if (ret) { + dev_err(acx->dev, "failed to exit sleep mode (%d)\n", ret); + goto err_power_off; + } + msleep(140); + + ret = mipi_dsi_dcs_set_display_on(dsi); + if (ret) { + dev_err(acx->dev, "failed to turn display on (%d)\n", ret); + goto err_power_off; + } + if (acx->video_mode) { + /* In video mode turn peripheral on */ + ret = mipi_dsi_turn_on_peripheral(dsi); + if (ret) { + dev_err(acx->dev, "failed to turn on peripheral\n"); + goto err_power_off; + } + } + + acx->bl->props.power = FB_BLANK_NORMAL; + + return 0; + +err_power_off: + acx424akp_power_off(acx); + return ret; +} + +static int acx424akp_unprepare(struct drm_panel *panel) +{ + struct acx424akp *acx = panel_to_acx424akp(panel); + struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev); + u8 par; + int ret; + + /* Disable backlight */ + par = 0x00; + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, + &par, 1); + if (ret) { + dev_err(acx->dev, "failed to disable display backlight (%d)\n", ret); + return ret; + } + + ret = mipi_dsi_dcs_set_display_off(dsi); + if (ret) { + dev_err(acx->dev, "failed to turn display off (%d)\n", ret); + return ret; + } + + /* Enter sleep mode */ + ret = mipi_dsi_dcs_enter_sleep_mode(dsi); + if (ret) { + dev_err(acx->dev, "failed to enter sleep mode (%d)\n", ret); + return ret; + } + msleep(85); + + acx424akp_power_off(acx); + acx->bl->props.power = FB_BLANK_POWERDOWN; + + return 0; +} + +static int acx424akp_enable(struct drm_panel *panel) +{ + struct acx424akp *acx = panel_to_acx424akp(panel); + + /* + * The backlight is on as long as the display is on + * so no use to call backlight_enable() here. + */ + acx->bl->props.power = FB_BLANK_UNBLANK; + + return 0; +} + +static int acx424akp_disable(struct drm_panel *panel) +{ + struct acx424akp *acx = panel_to_acx424akp(panel); + + /* + * The backlight is on as long as the display is on + * so no use to call backlight_disable() here. + */ + acx->bl->props.power = FB_BLANK_NORMAL; + + return 0; +} + +static int acx424akp_get_modes(struct drm_panel *panel, + struct drm_connector *connector) +{ + struct acx424akp *acx = panel_to_acx424akp(panel); + struct drm_display_mode *mode; + + if (acx->video_mode) + mode = drm_mode_duplicate(connector->dev, + &sony_acx424akp_vid_mode); + else + mode = drm_mode_duplicate(connector->dev, + &sony_acx424akp_cmd_mode); + if (!mode) { + dev_err(panel->dev, "bad mode or failed to add mode\n"); + return -EINVAL; + } + drm_mode_set_name(mode); + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; + + connector->display_info.width_mm = mode->width_mm; + connector->display_info.height_mm = mode->height_mm; + + drm_mode_probed_add(connector, mode); + + return 1; /* Number of modes */ +} + +static const struct drm_panel_funcs acx424akp_drm_funcs = { + .disable = acx424akp_disable, + .unprepare = acx424akp_unprepare, + .prepare = acx424akp_prepare, + .enable = acx424akp_enable, + .get_modes = acx424akp_get_modes, +}; + +static int acx424akp_probe(struct mipi_dsi_device *dsi) +{ + struct device *dev = &dsi->dev; + struct acx424akp *acx; + int ret; + + acx = devm_kzalloc(dev, sizeof(struct acx424akp), GFP_KERNEL); + if (!acx) + return -ENOMEM; + acx->video_mode = of_property_read_bool(dev->of_node, + "enforce-video-mode"); + + mipi_dsi_set_drvdata(dsi, acx); + acx->dev = dev; + + dsi->lanes = 2; + dsi->format = MIPI_DSI_FMT_RGB888; + /* + * FIXME: these come from the ST-Ericsson vendor driver for the + * HREF520 and seems to reflect limitations in the PLLs on that + * platform, if you have the datasheet, please cross-check the + * actual max rates. + */ + dsi->lp_rate = 19200000; + dsi->hs_rate = 420160000; + + if (acx->video_mode) + /* Burst mode using event for sync */ + dsi->mode_flags = + MIPI_DSI_MODE_VIDEO | + MIPI_DSI_MODE_VIDEO_BURST; + else + dsi->mode_flags = + MIPI_DSI_CLOCK_NON_CONTINUOUS; + + acx->supply = devm_regulator_get(dev, "vddi"); + if (IS_ERR(acx->supply)) + return PTR_ERR(acx->supply); + + /* This asserts RESET by default */ + acx->reset_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(acx->reset_gpio)) { + ret = PTR_ERR(acx->reset_gpio); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to request GPIO (%d)\n", ret); + return ret; + } + + drm_panel_init(&acx->panel, dev, &acx424akp_drm_funcs, + DRM_MODE_CONNECTOR_DSI); + + acx->bl = devm_backlight_device_register(dev, "acx424akp", dev, acx, + &acx424akp_bl_ops, NULL); + if (IS_ERR(acx->bl)) { + dev_err(dev, "failed to register backlight device\n"); + return PTR_ERR(acx->bl); + } + acx->bl->props.max_brightness = 1023; + acx->bl->props.brightness = 512; + acx->bl->props.power = FB_BLANK_POWERDOWN; + + drm_panel_add(&acx->panel); + + ret = mipi_dsi_attach(dsi); + if (ret < 0) { + drm_panel_remove(&acx->panel); + return ret; + } + + return 0; +} + +static int acx424akp_remove(struct mipi_dsi_device *dsi) +{ + struct acx424akp *acx = mipi_dsi_get_drvdata(dsi); + + mipi_dsi_detach(dsi); + drm_panel_remove(&acx->panel); + + return 0; +} + +static const struct of_device_id acx424akp_of_match[] = { + { .compatible = "sony,acx424akp" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, acx424akp_of_match); + +static struct mipi_dsi_driver acx424akp_driver = { + .probe = acx424akp_probe, + .remove = acx424akp_remove, + .driver = { + .name = "panel-sony-acx424akp", + .of_match_table = acx424akp_of_match, + }, +}; +module_mipi_dsi_driver(acx424akp_driver); + +MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>"); +MODULE_DESCRIPTION("MIPI-DSI Sony acx424akp Panel Driver"); +MODULE_LICENSE("GPL v2"); |