drm/panel: Add driver for the Toppoly TD043MTEA1 panel
authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Tue, 13 Aug 2019 20:11:01 +0000 (23:11 +0300)
committerSam Ravnborg <sam@ravnborg.org>
Wed, 14 Aug 2019 20:23:11 +0000 (22:23 +0200)
This panel is used on the OMAP3 Pandora.

The code is based on the omapdrm-specific panel-tpo-td043mtea1 driver.

v2:
- fix checkpatch warnings
  o (lcd == NULL) => (!lcd) (sam)
  o alignment to open '(' (sam)

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190813201101.30980-10-laurent.pinchart@ideasonboard.com
drivers/gpu/drm/panel/Kconfig
drivers/gpu/drm/panel/Makefile
drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
drivers/gpu/drm/panel/panel-tpo-td043mtea1.c [new file with mode: 0644]

index c2689420d2dd4ddb557c224847ecad3151986eb7..f152bc4eeb535efde0e4005bf514b9c3e3ea4a2e 100644 (file)
@@ -332,6 +332,13 @@ config DRM_PANEL_TPO_TD028TTEC1
          Say Y here if you want to enable support for TPO TD028TTEC1 480x640
          2.8" panel (found on the OpenMoko Neo FreeRunner and Neo 1973).
 
+config DRM_PANEL_TPO_TD043MTEA1
+       tristate "Toppoly (TPO) TD043MTEA1 panel driver"
+       depends on GPIOLIB && OF && REGULATOR && SPI
+       help
+         Say Y here if you want to enable support for TPO TD043MTEA1 800x480
+         4.3" panel (found on the OMAP3 Pandora board).
+
 config DRM_PANEL_TPO_TPG110
        tristate "TPO TPG 800x400 panel"
        depends on OF && SPI && GPIOLIB
index 27b776737ad39bab28089d60eba849141429531d..b6cd39fe0f206c9177ffd87a68bd591f0895eb10 100644 (file)
@@ -35,5 +35,6 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
 obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
 obj-$(CONFIG_DRM_PANEL_TPO_TD028TTEC1) += panel-tpo-td028ttec1.o
+obj-$(CONFIG_DRM_PANEL_TPO_TD043MTEA1) += panel-tpo-td043mtea1.o
 obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
 obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
index a400c83486b49360b5f35528a95a54448f8171b5..d7b2e34626efe81435a632711fb8b5dc2e1b3d01 100644 (file)
@@ -328,7 +328,7 @@ static int td028ttec1_probe(struct spi_device *spi)
        int ret;
 
        lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
-       if (lcd == NULL)
+       if (!lcd)
                return -ENOMEM;
 
        spi_set_drvdata(spi, lcd);
diff --git a/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c b/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c
new file mode 100644 (file)
index 0000000..3b4f30c
--- /dev/null
@@ -0,0 +1,509 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Toppoly TD043MTEA1 Panel Driver
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated
+ *
+ * Based on the omapdrm-specific panel-tpo-td043mtea1 driver
+ *
+ * Author: Gražvydas Ignotas <notasas@gmail.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#define TPO_R02_MODE(x)                        ((x) & 7)
+#define TPO_R02_MODE_800x480           7
+#define TPO_R02_NCLK_RISING            BIT(3)
+#define TPO_R02_HSYNC_HIGH             BIT(4)
+#define TPO_R02_VSYNC_HIGH             BIT(5)
+
+#define TPO_R03_NSTANDBY               BIT(0)
+#define TPO_R03_EN_CP_CLK              BIT(1)
+#define TPO_R03_EN_VGL_PUMP            BIT(2)
+#define TPO_R03_EN_PWM                 BIT(3)
+#define TPO_R03_DRIVING_CAP_100                BIT(4)
+#define TPO_R03_EN_PRE_CHARGE          BIT(6)
+#define TPO_R03_SOFTWARE_CTL           BIT(7)
+
+#define TPO_R04_NFLIP_H                        BIT(0)
+#define TPO_R04_NFLIP_V                        BIT(1)
+#define TPO_R04_CP_CLK_FREQ_1H         BIT(2)
+#define TPO_R04_VGL_FREQ_1H            BIT(4)
+
+#define TPO_R03_VAL_NORMAL \
+       (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | TPO_R03_EN_VGL_PUMP | \
+        TPO_R03_EN_PWM | TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
+        TPO_R03_SOFTWARE_CTL)
+
+#define TPO_R03_VAL_STANDBY \
+       (TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
+        TPO_R03_SOFTWARE_CTL)
+
+static const u16 td043mtea1_def_gamma[12] = {
+       105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
+};
+
+struct td043mtea1_panel {
+       struct drm_panel panel;
+
+       struct spi_device *spi;
+       struct regulator *vcc_reg;
+       struct gpio_desc *reset_gpio;
+
+       unsigned int mode;
+       u16 gamma[12];
+       bool vmirror;
+       bool powered_on;
+       bool spi_suspended;
+       bool power_on_resume;
+};
+
+#define to_td043mtea1_device(p) container_of(p, struct td043mtea1_panel, panel)
+
+/* -----------------------------------------------------------------------------
+ * Hardware Access
+ */
+
+static int td043mtea1_write(struct td043mtea1_panel *lcd, u8 addr, u8 value)
+{
+       struct spi_message msg;
+       struct spi_transfer xfer;
+       u16 data;
+       int ret;
+
+       spi_message_init(&msg);
+
+       memset(&xfer, 0, sizeof(xfer));
+
+       data = ((u16)addr << 10) | (1 << 8) | value;
+       xfer.tx_buf = &data;
+       xfer.bits_per_word = 16;
+       xfer.len = 2;
+       spi_message_add_tail(&xfer, &msg);
+
+       ret = spi_sync(lcd->spi, &msg);
+       if (ret < 0)
+               dev_warn(&lcd->spi->dev, "failed to write to LCD reg (%d)\n",
+                        ret);
+
+       return ret;
+}
+
+static void td043mtea1_write_gamma(struct td043mtea1_panel *lcd)
+{
+       const u16 *gamma = lcd->gamma;
+       unsigned int i;
+       u8 val;
+
+       /* gamma bits [9:8] */
+       for (val = i = 0; i < 4; i++)
+               val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
+       td043mtea1_write(lcd, 0x11, val);
+
+       for (val = i = 0; i < 4; i++)
+               val |= (gamma[i + 4] & 0x300) >> ((i + 1) * 2);
+       td043mtea1_write(lcd, 0x12, val);
+
+       for (val = i = 0; i < 4; i++)
+               val |= (gamma[i + 8] & 0x300) >> ((i + 1) * 2);
+       td043mtea1_write(lcd, 0x13, val);
+
+       /* gamma bits [7:0] */
+       for (val = i = 0; i < 12; i++)
+               td043mtea1_write(lcd, 0x14 + i, gamma[i] & 0xff);
+}
+
+static int td043mtea1_write_mirror(struct td043mtea1_panel *lcd)
+{
+       u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V |
+               TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
+       if (lcd->vmirror)
+               reg4 &= ~TPO_R04_NFLIP_V;
+
+       return td043mtea1_write(lcd, 4, reg4);
+}
+
+static int td043mtea1_power_on(struct td043mtea1_panel *lcd)
+{
+       int ret;
+
+       if (lcd->powered_on)
+               return 0;
+
+       ret = regulator_enable(lcd->vcc_reg);
+       if (ret < 0)
+               return ret;
+
+       /* Wait for the panel to stabilize. */
+       msleep(160);
+
+       gpiod_set_value(lcd->reset_gpio, 0);
+
+       td043mtea1_write(lcd, 2, TPO_R02_MODE(lcd->mode) | TPO_R02_NCLK_RISING);
+       td043mtea1_write(lcd, 3, TPO_R03_VAL_NORMAL);
+       td043mtea1_write(lcd, 0x20, 0xf0);
+       td043mtea1_write(lcd, 0x21, 0xf0);
+       td043mtea1_write_mirror(lcd);
+       td043mtea1_write_gamma(lcd);
+
+       lcd->powered_on = true;
+
+       return 0;
+}
+
+static void td043mtea1_power_off(struct td043mtea1_panel *lcd)
+{
+       if (!lcd->powered_on)
+               return;
+
+       td043mtea1_write(lcd, 3, TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
+
+       gpiod_set_value(lcd->reset_gpio, 1);
+
+       /* wait for at least 2 vsyncs before cutting off power */
+       msleep(50);
+
+       td043mtea1_write(lcd, 3, TPO_R03_VAL_STANDBY);
+
+       regulator_disable(lcd->vcc_reg);
+
+       lcd->powered_on = false;
+}
+
+/* -----------------------------------------------------------------------------
+ * sysfs
+ */
+
+static ssize_t vmirror_show(struct device *dev, struct device_attribute *attr,
+                           char *buf)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+
+       return snprintf(buf, PAGE_SIZE, "%d\n", lcd->vmirror);
+}
+
+static ssize_t vmirror_store(struct device *dev, struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+       int val;
+       int ret;
+
+       ret = kstrtoint(buf, 0, &val);
+       if (ret < 0)
+               return ret;
+
+       lcd->vmirror = !!val;
+
+       ret = td043mtea1_write_mirror(lcd);
+       if (ret < 0)
+               return ret;
+
+       return count;
+}
+
+static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
+                        char *buf)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+
+       return snprintf(buf, PAGE_SIZE, "%d\n", lcd->mode);
+}
+
+static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
+                         const char *buf, size_t count)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+       long val;
+       int ret;
+
+       ret = kstrtol(buf, 0, &val);
+       if (ret != 0 || val & ~7)
+               return -EINVAL;
+
+       lcd->mode = val;
+
+       val |= TPO_R02_NCLK_RISING;
+       td043mtea1_write(lcd, 2, val);
+
+       return count;
+}
+
+static ssize_t gamma_show(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+       ssize_t len = 0;
+       unsigned int i;
+       int ret;
+
+       for (i = 0; i < ARRAY_SIZE(lcd->gamma); i++) {
+               ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
+                              lcd->gamma[i]);
+               if (ret < 0)
+                       return ret;
+               len += ret;
+       }
+       buf[len - 1] = '\n';
+
+       return len;
+}
+
+static ssize_t gamma_store(struct device *dev, struct device_attribute *attr,
+                          const char *buf, size_t count)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+       unsigned int g[12];
+       unsigned int i;
+       int ret;
+
+       ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
+                    &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
+                    &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
+       if (ret != 12)
+               return -EINVAL;
+
+       for (i = 0; i < 12; i++)
+               lcd->gamma[i] = g[i];
+
+       td043mtea1_write_gamma(lcd);
+
+       return count;
+}
+
+static DEVICE_ATTR_RW(vmirror);
+static DEVICE_ATTR_RW(mode);
+static DEVICE_ATTR_RW(gamma);
+
+static struct attribute *td043mtea1_attrs[] = {
+       &dev_attr_vmirror.attr,
+       &dev_attr_mode.attr,
+       &dev_attr_gamma.attr,
+       NULL,
+};
+
+static const struct attribute_group td043mtea1_attr_group = {
+       .attrs = td043mtea1_attrs,
+};
+
+/* -----------------------------------------------------------------------------
+ * Panel Operations
+ */
+
+static int td043mtea1_unprepare(struct drm_panel *panel)
+{
+       struct td043mtea1_panel *lcd = to_td043mtea1_device(panel);
+
+       if (!lcd->spi_suspended)
+               td043mtea1_power_off(lcd);
+
+       return 0;
+}
+
+static int td043mtea1_prepare(struct drm_panel *panel)
+{
+       struct td043mtea1_panel *lcd = to_td043mtea1_device(panel);
+       int ret;
+
+       /*
+        * If we are resuming from system suspend, SPI might not be enabled
+        * yet, so we'll program the LCD from SPI PM resume callback.
+        */
+       if (lcd->spi_suspended)
+               return 0;
+
+       ret = td043mtea1_power_on(lcd);
+       if (ret) {
+               dev_err(&lcd->spi->dev, "%s: power on failed (%d)\n",
+                       __func__, ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static const struct drm_display_mode td043mtea1_mode = {
+       .clock = 36000,
+       .hdisplay = 800,
+       .hsync_start = 800 + 68,
+       .hsync_end = 800 + 68 + 1,
+       .htotal = 800 + 68 + 1 + 214,
+       .vdisplay = 480,
+       .vsync_start = 480 + 39,
+       .vsync_end = 480 + 39 + 1,
+       .vtotal = 480 + 39 + 1 + 34,
+       .vrefresh = 60,
+       .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+       .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+       .width_mm = 94,
+       .height_mm = 56,
+};
+
+static int td043mtea1_get_modes(struct drm_panel *panel)
+{
+       struct drm_connector *connector = panel->connector;
+       struct drm_display_mode *mode;
+
+       mode = drm_mode_duplicate(panel->drm, &td043mtea1_mode);
+       if (!mode)
+               return -ENOMEM;
+
+       drm_mode_set_name(mode);
+       drm_mode_probed_add(connector, mode);
+
+       connector->display_info.width_mm = td043mtea1_mode.width_mm;
+       connector->display_info.height_mm = td043mtea1_mode.height_mm;
+       /*
+        * FIXME: According to the datasheet sync signals are sampled on the
+        * rising edge of the clock, but the code running on the OMAP3 Pandora
+        * indicates sampling on the falling edge. This should be tested on a
+        * real device.
+        */
+       connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
+                                         | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
+                                         | DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE;
+
+       return 1;
+}
+
+static const struct drm_panel_funcs td043mtea1_funcs = {
+       .unprepare = td043mtea1_unprepare,
+       .prepare = td043mtea1_prepare,
+       .get_modes = td043mtea1_get_modes,
+};
+
+/* -----------------------------------------------------------------------------
+ * Power Management, Probe and Remove
+ */
+
+static int __maybe_unused td043mtea1_suspend(struct device *dev)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+
+       if (lcd->powered_on) {
+               td043mtea1_power_off(lcd);
+               lcd->powered_on = true;
+       }
+
+       lcd->spi_suspended = true;
+
+       return 0;
+}
+
+static int __maybe_unused td043mtea1_resume(struct device *dev)
+{
+       struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
+       int ret;
+
+       lcd->spi_suspended = false;
+
+       if (lcd->powered_on) {
+               lcd->powered_on = false;
+               ret = td043mtea1_power_on(lcd);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(td043mtea1_pm_ops, td043mtea1_suspend,
+                        td043mtea1_resume);
+
+static int td043mtea1_probe(struct spi_device *spi)
+{
+       struct td043mtea1_panel *lcd;
+       int ret;
+
+       lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
+       if (lcd == NULL)
+               return -ENOMEM;
+
+       spi_set_drvdata(spi, lcd);
+       lcd->spi = spi;
+       lcd->mode = TPO_R02_MODE_800x480;
+       memcpy(lcd->gamma, td043mtea1_def_gamma, sizeof(lcd->gamma));
+
+       lcd->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
+       if (IS_ERR(lcd->vcc_reg)) {
+               dev_err(&spi->dev, "failed to get VCC regulator\n");
+               return PTR_ERR(lcd->vcc_reg);
+       }
+
+       lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
+       if (IS_ERR(lcd->reset_gpio)) {
+               dev_err(&spi->dev, "failed to get reset GPIO\n");
+               return PTR_ERR(lcd->reset_gpio);
+       }
+
+       spi->bits_per_word = 16;
+       spi->mode = SPI_MODE_0;
+
+       ret = spi_setup(spi);
+       if (ret < 0) {
+               dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
+               return ret;
+       }
+
+       ret = sysfs_create_group(&spi->dev.kobj, &td043mtea1_attr_group);
+       if (ret < 0) {
+               dev_err(&spi->dev, "failed to create sysfs files\n");
+               return ret;
+       }
+
+       drm_panel_init(&lcd->panel);
+       lcd->panel.dev = &lcd->spi->dev;
+       lcd->panel.funcs = &td043mtea1_funcs;
+
+       ret = drm_panel_add(&lcd->panel);
+       if (ret < 0) {
+               sysfs_remove_group(&spi->dev.kobj, &td043mtea1_attr_group);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int td043mtea1_remove(struct spi_device *spi)
+{
+       struct td043mtea1_panel *lcd = spi_get_drvdata(spi);
+
+       drm_panel_remove(&lcd->panel);
+       drm_panel_disable(&lcd->panel);
+       drm_panel_unprepare(&lcd->panel);
+
+       sysfs_remove_group(&spi->dev.kobj, &td043mtea1_attr_group);
+
+       return 0;
+}
+
+static const struct of_device_id td043mtea1_of_match[] = {
+       { .compatible = "tpo,td043mtea1", },
+       { /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, td043mtea1_of_match);
+
+static struct spi_driver td043mtea1_driver = {
+       .probe          = td043mtea1_probe,
+       .remove         = td043mtea1_remove,
+       .driver         = {
+               .name   = "panel-tpo-td043mtea1",
+               .pm     = &td043mtea1_pm_ops,
+               .of_match_table = td043mtea1_of_match,
+       },
+};
+
+module_spi_driver(td043mtea1_driver);
+
+MODULE_ALIAS("spi:tpo,td043mtea1");
+MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
+MODULE_DESCRIPTION("TPO TD043MTEA1 Panel Driver");
+MODULE_LICENSE("GPL");