The patch adds LD9040 parallel RGB panel driver with SPI control interface. The driver uses drm_panel framework.
Signed-off-by: Andrzej Hajda a.hajda@samsung.com --- v2: removed useless include --- drivers/gpu/drm/panel/Kconfig | 6 + drivers/gpu/drm/panel/Makefile | 1 + drivers/gpu/drm/panel/panel-ld9040.c | 376 +++++++++++++++++++++++++++++++++++ 3 files changed, 383 insertions(+) create mode 100644 drivers/gpu/drm/panel/panel-ld9040.c
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index 3e0f13d..94cc0c7 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -16,4 +16,10 @@ config DRM_PANEL_SIMPLE that it can be automatically turned off when the panel goes into a low power state.
+config DRM_PANEL_LD9040 + tristate "LD9040 RGB/SPI panel" + depends on DRM && DRM_PANEL + depends on OF + select VIDEOMODE_HELPERS + endmenu diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile index af9dfa2..4f7dfce 100644 --- a/drivers/gpu/drm/panel/Makefile +++ b/drivers/gpu/drm/panel/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o +obj-$(CONFIG_DRM_PANEL_LD9040) += panel-ld9040.o diff --git a/drivers/gpu/drm/panel/panel-ld9040.c b/drivers/gpu/drm/panel/panel-ld9040.c new file mode 100644 index 0000000..1f1f837 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-ld9040.c @@ -0,0 +1,376 @@ +/* + * ld9040 AMOLED LCD drm_panel driver. + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd + * Derived from drivers/video/backlight/ld9040.c + * + * Andrzej Hajda a.hajda@samsung.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include <drm/drmP.h> +#include <drm/drm_panel.h> + +#include <linux/gpio/consumer.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> + +/* Manufacturer Command Set */ +#define MCS_MANPWR 0xb0 +#define MCS_ELVSS_ON 0xb1 +#define MCS_USER_SETTING 0xf0 +#define MCS_DISPCTL 0xf2 +#define MCS_GTCON 0xf7 +#define MCS_PANEL_CONDITION 0xf8 +#define MCS_GAMMA_SET1 0xf9 +#define MCS_GAMMA_CTRL 0xfb + +/* array of gamma tables for gamma value 2.2 */ +static u8 const ld9040_gammas[25][22] = { + { 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0, + 0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 }, + { 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf, + 0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 }, + { 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe, + 0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 }, + { 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc, + 0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d }, + { 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc, + 0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 }, + { 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb, + 0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 }, + { 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb, + 0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c }, + { 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb, + 0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 }, + { 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba, + 0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 }, + { 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba, + 0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a }, + { 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba, + 0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e }, + { 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8, + 0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 }, + { 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9, + 0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 }, + { 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8, + 0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 }, + { 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8, + 0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d }, + { 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8, + 0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 }, + { 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8, + 0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 }, + { 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7, + 0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 }, + { 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7, + 0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a }, + { 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6, + 0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d }, + { 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6, + 0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 }, + { 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7, + 0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 }, + { 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5, + 0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 }, + { 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6, + 0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa }, + { 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4, + 0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 }, +}; + +struct ld9040 { + struct device *dev; + struct drm_panel panel; + + struct regulator_bulk_data supplies[2]; + struct gpio_desc *reset_gpio; + u32 power_on_delay; + u32 reset_delay; + struct videomode vm; + u32 width_mm; + u32 height_mm; + + int brightness; + + /* This field is tested by functions directly accessing bus before + * transfer, transfer is skipped if it is set. In case of transfer + * failure or unexpected response the field is set to error value. + * Such construct allows to eliminate many checks in higher level + * functions. + */ + int error; +}; + +#define panel_to_ld9040(p) container_of(p, struct ld9040, panel) + +static int ld9040_clear_error(struct ld9040 *ctx) +{ + int ret = ctx->error; + + ctx->error = 0; + return ret; +} + +static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data) +{ + struct spi_device *spi = to_spi_device(ctx->dev); + struct spi_transfer xfer = { + .len = 2, + .tx_buf = &data, + }; + struct spi_message msg; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + + return spi_sync(spi, &msg); +} + +static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len) +{ + int ret = 0; + + if (ctx->error < 0 || len == 0) + return; + + dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", len, data); + ret = ld9040_spi_write_word(ctx, *data); + + while (!ret && --len) { + ++data; + ret = ld9040_spi_write_word(ctx, *data | 0x100); + } + + if (ret) { + dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret, len, + data); + ctx->error = ret; + } + + usleep_range(300, 310); +} + +#define ld9040_dcs_write_seq_static(ctx, seq...) \ +({\ + static const u8 d[] = { seq };\ + ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\ +}) + +static void ld9040_brightness_set(struct ld9040 *ctx) +{ + ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness], + ARRAY_SIZE(ld9040_gammas[ctx->brightness])); + + ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a); +} + +static void ld9040_init(struct ld9040 *ctx) +{ + ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a); + ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION, + 0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d, + 0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d, + 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02); + ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL, + 0x02, 0x08, 0x08, 0x10, 0x10); + ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04); + ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16); + ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00); + ld9040_brightness_set(ctx); + ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE); + ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON); +} + +static int ld9040_power_on(struct ld9040 *ctx) +{ + int ret; + + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); + if (ret < 0) + return ret; + + msleep(ctx->power_on_delay); + gpiod_set_value(ctx->reset_gpio, 0); + msleep(ctx->reset_delay); + gpiod_set_value(ctx->reset_gpio, 1); + msleep(ctx->reset_delay); + + return 0; +} + +static int ld9040_power_off(struct ld9040 *ctx) +{ + return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); +} + +static int ld9040_disable(struct drm_panel *panel) +{ + struct ld9040 *ctx = panel_to_ld9040(panel); + + msleep(120); + ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF); + ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE); + msleep(40); + + ld9040_clear_error(ctx); + + return ld9040_power_off(ctx); +} + +static int ld9040_enable(struct drm_panel *panel) +{ + struct ld9040 *ctx = panel_to_ld9040(panel); + int ret; + + ret = ld9040_power_on(ctx); + if (ret < 0) + return ret; + + ld9040_init(ctx); + + ret = ld9040_clear_error(ctx); + + if (ret < 0) + ld9040_disable(panel); + + return ret; +} + +static int ld9040_get_modes(struct drm_panel *panel) +{ + struct drm_connector *connector = panel->connector; + struct ld9040 *ctx = panel_to_ld9040(panel); + struct drm_display_mode *mode; + + mode = drm_mode_create(connector->dev); + if (!mode) { + DRM_ERROR("failed to create a new display mode\n"); + return 0; + } + + drm_display_mode_from_videomode(&ctx->vm, mode); + mode->width_mm = ctx->width_mm; + mode->height_mm = ctx->height_mm; + connector->display_info.width_mm = mode->width_mm; + connector->display_info.height_mm = mode->height_mm; + + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; + drm_mode_probed_add(connector, mode); + + return 1; +} + +static const struct drm_panel_funcs ld9040_drm_funcs = { + .disable = ld9040_disable, + .enable = ld9040_enable, + .get_modes = ld9040_get_modes, +}; + +static int ld9040_parse_dt(struct ld9040 *ctx) +{ + struct device *dev = ctx->dev; + struct device_node *np = dev->of_node; + int ret; + + ret = of_get_videomode(np, &ctx->vm, 0); + if (ret < 0) + return ret; + + of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay); + of_property_read_u32(np, "reset-delay", &ctx->reset_delay); + of_property_read_u32(np, "panel-width-mm", &ctx->width_mm); + of_property_read_u32(np, "panel-height-mm", &ctx->height_mm); + + return 0; +} + +static int ld9040_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct ld9040 *ctx; + int ret; + + ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + spi_set_drvdata(spi, ctx); + + ctx->dev = dev; + ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1; + + ret = ld9040_parse_dt(ctx); + if (ret < 0) + return ret; + + ctx->supplies[0].supply = "vdd3"; + ctx->supplies[1].supply = "vci"; + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies), + ctx->supplies); + if (ret < 0) + return ret; + + ctx->reset_gpio = devm_gpiod_get(dev, "reset"); + if (IS_ERR(ctx->reset_gpio)) { + dev_err(dev, "cannot get reset-gpios %ld\n", + PTR_ERR(ctx->reset_gpio)); + return PTR_ERR(ctx->reset_gpio); + } + ret = gpiod_direction_output(ctx->reset_gpio, 1); + if (ret < 0) { + dev_err(dev, "cannot configure reset-gpios %d\n", ret); + return ret; + } + + spi->bits_per_word = 9; + ret = spi_setup(spi); + if (ret < 0) { + dev_err(dev, "spi setup failed.\n"); + return ret; + } + + drm_panel_init(&ctx->panel); + ctx->panel.dev = dev; + ctx->panel.funcs = &ld9040_drm_funcs; + + return drm_panel_add(&ctx->panel); +} + +static int ld9040_remove(struct spi_device *spi) +{ + struct ld9040 *ctx = spi_get_drvdata(spi); + + ld9040_power_off(ctx); + drm_panel_remove(&ctx->panel); + + return 0; +} + +static struct of_device_id ld9040_of_match[] = { + { .compatible = "samsung,ld9040" }, + { } +}; +MODULE_DEVICE_TABLE(of, ld9040_of_match); + +static struct spi_driver ld9040_driver = { + .probe = ld9040_probe, + .remove = ld9040_remove, + .driver = { + .name = "ld9040", + .owner = THIS_MODULE, + .of_match_table = ld9040_of_match, + }, +}; +module_spi_driver(ld9040_driver); + +MODULE_AUTHOR("Andrzej Hajda a.hajda@samsung.com"); +MODULE_DESCRIPTION("ld9040 LCD Driver"); +MODULE_LICENSE("GPL v2");