[PATCH] drm/panel: add lg4573 driver
Heiko Schocher
hs at denx.de
Wed May 6 00:49:33 PDT 2015
The patch adds LG4573 parallel RGB panel driver with SPI control interface.
The driver uses drm_panel framework.
Signed-off-by: Heiko Schocher <hs at denx.de>
---
.../devicetree/bindings/panel/lg,lg4573.txt | 42 +++
drivers/gpu/drm/panel/Kconfig | 8 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-lg4573.c | 367 +++++++++++++++++++++
4 files changed, 418 insertions(+)
create mode 100644 Documentation/devicetree/bindings/panel/lg,lg4573.txt
create mode 100644 drivers/gpu/drm/panel/panel-lg4573.c
diff --git a/Documentation/devicetree/bindings/panel/lg,lg4573.txt b/Documentation/devicetree/bindings/panel/lg,lg4573.txt
new file mode 100644
index 0000000..55f495d
--- /dev/null
+++ b/Documentation/devicetree/bindings/panel/lg,lg4573.txt
@@ -0,0 +1,42 @@
+LG LG4573 TFT liquid crystal display with SPI control bus
+
+Required properties:
+ - compatible: "lg4573"
+ - reg: address of the panel on SPI bus
+ - display-timings: timings for the connected panel according to [1]
+
+The panel must obey rules for SPI slave device specified in document [2].
+
+Optional properties:
+ - power-on-delay: delay after turning regulators on [ms]
+
+[1]: Documentation/devicetree/bindings/video/display-timing.txt
+[2]: Documentation/devicetree/bindings/spi/spi-bus.txt
+
+Example:
+
+ lcd_panel: display at 0 {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "lg,lg4573";
+ spi-max-frequency = <10000000>;
+ reset-gpios = <&gpio2 11 0>;
+ reg = <0>;
+ power-on-delay = <10>;
+ display-timings {
+ 480x800p57 {
+ native-mode;
+ clock-frequency = <27000027>;
+ hactive = <480>;
+ vactive = <800>;
+ hfront-porch = <10>;
+ hback-porch = <59>;
+ hsync-len = <10>;
+ vback-porch = <15>;
+ vfront-porch = <15>;
+ vsync-len = <15>;
+ hsync-active = <1>;
+ vsync-active = <1>;
+ };
+ };
+ };
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 6d64c7b..29c3407 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -23,6 +23,14 @@ config DRM_PANEL_LD9040
depends on OF && SPI
select VIDEOMODE_HELPERS
+config DRM_PANEL_LG4573
+ tristate "LG4573 RGB/SPI panel"
+ depends on OF && SPI
+ select VIDEOMODE_HELPERS
+ help
+ Say Y here if you want to enable support for LG4573 RGB panel.
+ To compile this driver as a module, choose M here.
+
config DRM_PANEL_S6E8AA0
tristate "S6E8AA0 DSI video mode panel"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 4b2a043..715b95d 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
obj-$(CONFIG_DRM_PANEL_LD9040) += panel-ld9040.o
+obj-$(CONFIG_DRM_PANEL_LG4573) += panel-lg4573.o
obj-$(CONFIG_DRM_PANEL_S6E8AA0) += panel-s6e8aa0.o
obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
diff --git a/drivers/gpu/drm/panel/panel-lg4573.c b/drivers/gpu/drm/panel/panel-lg4573.c
new file mode 100644
index 0000000..9d5e5a5
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-lg4573.c
@@ -0,0 +1,367 @@
+/*
+ *
+ * Copyright (C) 2015 Heiko Schocher <hs at denx.de>
+ *
+ * from:
+ * drivers/gpu/drm/panel/panel-ld9040.c
+ * ld9040 AMOLED LCD drm_panel driver.
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd
+ * Derived from drivers/video/backlight/ld9040.c
+ *
+ * Andrzej Hajda <a.hajda at 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>
+
+struct lg4573 {
+ struct device *dev;
+ struct drm_panel panel;
+ u32 power_on_delay;
+ struct videomode vm;
+};
+
+static inline struct lg4573 *panel_to_lg4573(struct drm_panel *panel)
+{
+ return container_of(panel, struct lg4573, panel);
+}
+
+static int lg4573_spi_write_u16(struct lg4573 *ctx, u16 data)
+{
+ struct spi_device *spi = to_spi_device(ctx->dev);
+ struct spi_transfer xfer = {
+ .len = 2,
+ };
+ struct spi_message msg;
+ u16 temp = htons(data);
+
+ dev_dbg(ctx->dev, "writing data: %x\n", data);
+ xfer.tx_buf = &temp;
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ return spi_sync(spi, &msg);
+}
+
+static void lg4573_spi_write_u16_array(struct lg4573 *ctx, u16 *buff, int size)
+{
+ int idx;
+
+ for (idx = 0; idx < size; idx++)
+ lg4573_spi_write_u16(ctx, buff[idx]);
+}
+
+static void lg4573_display_on(struct lg4573 *ctx)
+{
+ static u16 sleep_out = 0x7011;
+ static u16 display_on = 0x7029;
+
+ lg4573_spi_write_u16(ctx, sleep_out);
+ msleep(ctx->power_on_delay);
+ lg4573_spi_write_u16(ctx, display_on);
+}
+
+static int lg4573_display_off(struct lg4573 *ctx)
+{
+ static u16 display_off = 0x7028;
+ static u16 sleep_in = 0x7010;
+
+ lg4573_spi_write_u16(ctx, display_off);
+ msleep(ctx->power_on_delay);
+ lg4573_spi_write_u16(ctx, sleep_in);
+ return 0;
+}
+
+static void lg4573_display_mode_settings(struct lg4573 *ctx)
+{
+ static u16 display_mode_settings[] = {
+ 0x703A,
+ 0x7270,
+ 0x70B1,
+ 0x7208,
+ 0x723B,
+ 0x720F,
+ 0x70B2,
+ 0x7200,
+ 0x72C8,
+ 0x70B3,
+ 0x7200,
+ 0x70B4,
+ 0x7200,
+ 0x70B5,
+ 0x7242,
+ 0x7210,
+ 0x7210,
+ 0x7200,
+ 0x7220,
+ 0x70B6,
+ 0x720B,
+ 0x720F,
+ 0x723C,
+ 0x7213,
+ 0x7213,
+ 0x72E8,
+ 0x70B7,
+ 0x7246,
+ 0x7206,
+ 0x720C,
+ 0x7200,
+ 0x7200,
+ };
+
+ dev_dbg(ctx->dev, "transfer display mode settings\n");
+ lg4573_spi_write_u16_array(ctx, display_mode_settings,
+ ARRAY_SIZE(display_mode_settings));
+}
+
+static void lg4573_power_settings(struct lg4573 *ctx)
+{
+ static u16 power_settings[] = {
+ 0x70C0,
+ 0x7201,
+ 0x7211,
+ 0x70C3,
+ 0x7207,
+ 0x7203,
+ 0x7204,
+ 0x7204,
+ 0x7204,
+ 0x70C4,
+ 0x7212,
+ 0x7224,
+ 0x7218,
+ 0x7218,
+ 0x7202,
+ 0x7249,
+ 0x70C5,
+ 0x726F,
+ 0x70C6,
+ 0x7241,
+ 0x7263,
+ };
+
+ dev_dbg(ctx->dev, "transfer power settings\n");
+ lg4573_spi_write_u16_array(ctx, power_settings,
+ ARRAY_SIZE(power_settings));
+}
+
+static void lg4573_gamma_settings(struct lg4573 *ctx)
+{
+ static u16 gamma_settings[] = {
+ 0x70D0,
+ 0x7203,
+ 0x7207,
+ 0x7273,
+ 0x7235,
+ 0x7200,
+ 0x7201,
+ 0x7220,
+ 0x7200,
+ 0x7203,
+ 0x70D1,
+ 0x7203,
+ 0x7207,
+ 0x7273,
+ 0x7235,
+ 0x7200,
+ 0x7201,
+ 0x7220,
+ 0x7200,
+ 0x7203,
+ 0x70D2,
+ 0x7203,
+ 0x7207,
+ 0x7273,
+ 0x7235,
+ 0x7200,
+ 0x7201,
+ 0x7220,
+ 0x7200,
+ 0x7203,
+ 0x70D3,
+ 0x7203,
+ 0x7207,
+ 0x7273,
+ 0x7235,
+ 0x7200,
+ 0x7201,
+ 0x7220,
+ 0x7200,
+ 0x7203,
+ 0x70D4,
+ 0x7203,
+ 0x7207,
+ 0x7273,
+ 0x7235,
+ 0x7200,
+ 0x7201,
+ 0x7220,
+ 0x7200,
+ 0x7203,
+ 0x70D5,
+ 0x7203,
+ 0x7207,
+ 0x7273,
+ 0x7235,
+ 0x7200,
+ 0x7201,
+ 0x7220,
+ 0x7200,
+ 0x7203,
+ };
+
+ dev_dbg(ctx->dev, "transfer gamma settings\n");
+ lg4573_spi_write_u16_array(ctx, gamma_settings,
+ ARRAY_SIZE(gamma_settings));
+}
+
+static void lg4573_init(struct lg4573 *ctx)
+{
+ dev_dbg(ctx->dev, "initializing LCD\n");
+
+ lg4573_display_mode_settings(ctx);
+ lg4573_power_settings(ctx);
+ lg4573_gamma_settings(ctx);
+}
+
+static int lg4573_power_on(struct lg4573 *ctx)
+{
+ msleep(ctx->power_on_delay);
+ lg4573_display_on(ctx);
+ return 0;
+}
+
+static int lg4573_disable(struct drm_panel *panel)
+{
+ struct lg4573 *ctx = panel_to_lg4573(panel);
+
+ return lg4573_display_off(ctx);
+}
+
+static int lg4573_enable(struct drm_panel *panel)
+{
+ struct lg4573 *ctx = panel_to_lg4573(panel);
+ int ret;
+
+ lg4573_init(ctx);
+
+ ret = lg4573_power_on(ctx);
+
+ return ret;
+}
+
+static int lg4573_get_modes(struct drm_panel *panel)
+{
+ struct drm_connector *connector = panel->connector;
+ struct lg4573 *ctx = panel_to_lg4573(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->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(connector, mode);
+
+ return 1;
+}
+
+static const struct drm_panel_funcs lg4573_drm_funcs = {
+ .disable = lg4573_disable,
+ .enable = lg4573_enable,
+ .get_modes = lg4573_get_modes,
+};
+
+static int lg4573_parse_dt(struct lg4573 *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);
+
+ return 0;
+}
+
+static int lg4573_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct lg4573 *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(dev, sizeof(struct lg4573), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, ctx);
+ ctx->dev = dev;
+
+ ret = lg4573_parse_dt(ctx);
+ if (ret < 0)
+ return ret;
+
+ spi->bits_per_word = 8;
+ 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 = &lg4573_drm_funcs;
+
+ return drm_panel_add(&ctx->panel);
+}
+
+static int lg4573_remove(struct spi_device *spi)
+{
+ struct lg4573 *ctx = spi_get_drvdata(spi);
+
+ lg4573_display_off(ctx);
+ drm_panel_remove(&ctx->panel);
+
+ return 0;
+}
+
+static const struct of_device_id lg4573_of_match[] = {
+ { .compatible = "lg,lg4573" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, lg4573_of_match);
+
+static struct spi_driver lg4573_driver = {
+ .probe = lg4573_probe,
+ .remove = lg4573_remove,
+ .driver = {
+ .name = "lg4573",
+ .owner = THIS_MODULE,
+ .of_match_table = lg4573_of_match,
+ },
+};
+module_spi_driver(lg4573_driver);
+
+MODULE_AUTHOR("Heiko Schocher <hs at denx.de>");
+MODULE_DESCRIPTION("lg4573 LCD Driver");
+MODULE_LICENSE("GPL v2");
--
2.1.0
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