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    Subject[PATCH v4 2/2] drm: panel: Add tianma nt36672a panel driver
    Date
    Some Poco F1 phones have an LCD panel from Tianma, model nt36672a,
    with a resolution of 1080x2246 that operates in DSI video mode.

    Add the drm panel driver for it.

    During testing, Benni Steini <bennisteinir@gmail.com> helped us fix
    the reset sequence timing (from 10ms to 20ms), to get the bootanimation
    to work on Android.

    With current AOSP, we need to increase it to 200ms - this seems to be a
    safe high value to avoid a white screen occasionally.

    Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
    Cc: Benni Steini <bennisteinir@gmail.com>

    ---
    v2: increase reset sequence timing to a safe 200ms
    v4: Since "0425662fdf05: drm: Nuke mode->vrefresh", we have to calculate
    vrefresh on demand. Update for it.
    ---
    MAINTAINERS | 7 +
    drivers/gpu/drm/panel/Kconfig | 11 +
    drivers/gpu/drm/panel/Makefile | 1 +
    drivers/gpu/drm/panel/panel-tianma-nt36672a.c | 858 ++++++++++++++++++
    4 files changed, 877 insertions(+)
    create mode 100644 drivers/gpu/drm/panel/panel-tianma-nt36672a.c

    diff --git a/MAINTAINERS b/MAINTAINERS
    index f77df02e4121..9e4bc8da9b2d 100644
    --- a/MAINTAINERS
    +++ b/MAINTAINERS
    @@ -5611,6 +5611,13 @@ T: git git://anongit.freedesktop.org/drm/drm-misc
    F: Documentation/devicetree/bindings/display/ste,mcde.txt
    F: drivers/gpu/drm/mcde/

    +DRM DRIVER FOR TIANMA NT36672A PANELS
    +M: Sumit Semwal <sumit.semwal@linaro.org>
    +S: Maintained
    +T: git git://anongit.freedesktop.org/drm/drm-misc
    +F: Documentation/devicetree/bindings/display/panel/tianma,nt36672a-panel.yaml
    +F: drivers/gpu/drm/panel/panel-tianma-nt36672a.c
    +
    DRM DRIVER FOR TDFX VIDEO CARDS
    S: Orphan / Obsolete
    F: drivers/gpu/drm/tdfx/
    diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
    index de2f2a452be5..8108a682dcb0 100644
    --- a/drivers/gpu/drm/panel/Kconfig
    +++ b/drivers/gpu/drm/panel/Kconfig
    @@ -437,6 +437,17 @@ config DRM_PANEL_TPO_TD043MTEA1
    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_TIANMA_FHD_NT36672A
    + tristate "TIANMA NT36672A panel"
    + depends on OF
    + depends on DRM_MIPI_DSI
    + depends on BACKLIGHT_CLASS_DEVICE
    + help
    + Say Y here if you want to enable support for the Tianma NT36672A
    + panel. It is seen mostly in Xiaomi Poco F1 mobile phone.
    + The panel has a 1080x2246 resolution and uses 24 bit RGB per pixel.
    + It provides a MIPI DSI interface to the host.
    +
    config DRM_PANEL_TPO_TPG110
    tristate "TPO TPG 800x400 panel"
    depends on OF && SPI && GPIOLIB
    diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
    index e45ceac6286f..472ae9ba8788 100644
    --- a/drivers/gpu/drm/panel/Makefile
    +++ b/drivers/gpu/drm/panel/Makefile
    @@ -44,6 +44,7 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
    obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
    obj-$(CONFIG_DRM_PANEL_SONY_ACX424AKP) += panel-sony-acx424akp.o
    obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
    +obj-$(CONFIG_DRM_PANEL_TIANMA_FHD_NT36672A) += panel-tianma-nt36672a.o
    obj-$(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
    diff --git a/drivers/gpu/drm/panel/panel-tianma-nt36672a.c b/drivers/gpu/drm/panel/panel-tianma-nt36672a.c
    new file mode 100644
    index 000000000000..2941975e039c
    --- /dev/null
    +++ b/drivers/gpu/drm/panel/panel-tianma-nt36672a.c
    @@ -0,0 +1,858 @@
    +// SPDX-License-Identifier: GPL-2.0+
    +/*
    + * Copyright (C) 2020 Linaro Ltd
    + * Author: Sumit Semwal <sumit.semwal@linaro.org>
    + */
    +
    +#include <linux/delay.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/of.h>
    +#include <linux/of_device.h>
    +
    +#include <linux/gpio/consumer.h>
    +#include <linux/pinctrl/consumer.h>
    +#include <linux/regulator/consumer.h>
    +
    +#include <drm/drm_device.h>
    +#include <drm/drm_mipi_dsi.h>
    +#include <drm/drm_modes.h>
    +#include <drm/drm_panel.h>
    +#include <drm/drm_print.h>
    +
    +#include <video/mipi_display.h>
    +
    +struct panel_cmd {
    + size_t len;
    + const char *data;
    +};
    +
    +#define _INIT_CMD(...) { \
    + .len = sizeof((char[]){__VA_ARGS__}), \
    + .data = (char[]){__VA_ARGS__} }
    +
    +static const char * const regulator_names[] = {
    + "vddio",
    + "vddpos",
    + "vddneg",
    +};
    +
    +static unsigned long const regulator_enable_loads[] = {
    + 62000,
    + 100000,
    + 100000
    +};
    +
    +static unsigned long const regulator_disable_loads[] = {
    + 80,
    + 100,
    + 100
    +};
    +
    +struct panel_desc {
    + const struct drm_display_mode *display_mode;
    + const char *panel_name;
    +
    + unsigned int width_mm;
    + unsigned int height_mm;
    +
    + unsigned long mode_flags;
    + enum mipi_dsi_pixel_format format;
    + unsigned int lanes;
    +
    + const struct panel_cmd *on_cmds_1;
    + const struct panel_cmd *on_cmds_2;
    +
    + const struct panel_cmd *off_cmds;
    +};
    +
    +struct panel_info {
    + struct drm_panel base;
    + struct mipi_dsi_device *link;
    + const struct panel_desc *desc;
    +
    + struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
    +
    + struct gpio_desc *reset_gpio;
    +
    + struct pinctrl *pinctrl;
    + struct pinctrl_state *active;
    + struct pinctrl_state *suspend;
    +
    +
    + bool prepared;
    + bool enabled;
    +};
    +
    +static inline struct panel_info *to_panel_info(struct drm_panel *panel)
    +{
    + return container_of(panel, struct panel_info, base);
    +}
    +
    +static int send_mipi_cmds(struct drm_panel *panel, const struct panel_cmd *cmds)
    +{
    + struct panel_info *pinfo = to_panel_info(panel);
    + unsigned int i = 0;
    + int err;
    +
    + if (!cmds)
    + return -EFAULT;
    +
    + for (i = 0; cmds[i].len != 0; i++) {
    + const struct panel_cmd *cmd = &cmds[i];
    +
    + if (cmd->len == 2)
    + err = mipi_dsi_dcs_write(pinfo->link,
    + cmd->data[1], NULL, 0);
    + else
    + err = mipi_dsi_dcs_write(pinfo->link,
    + cmd->data[1], cmd->data + 2,
    + cmd->len - 2);
    +
    + if (err < 0)
    + return err;
    +
    + }
    +
    + return 0;
    +}
    +
    +static int panel_set_pinctrl_state(struct panel_info *panel, bool enable)
    +{
    + int rc = 0;
    + struct pinctrl_state *state;
    +
    + if (enable)
    + state = panel->active;
    + else
    + state = panel->suspend;
    +
    + rc = pinctrl_select_state(panel->pinctrl, state);
    + if (rc)
    + pr_err("[%s] failed to set pin state, rc=%d\n", panel->desc->panel_name,
    + rc);
    + return rc;
    +}
    +
    +static int tianma_panel_disable(struct drm_panel *panel)
    +{
    + struct panel_info *pinfo = to_panel_info(panel);
    +
    + pinfo->enabled = false;
    +
    + return 0;
    +}
    +
    +static int tianma_panel_power_off(struct drm_panel *panel)
    +{
    + struct panel_info *pinfo = to_panel_info(panel);
    + int i, ret = 0;
    +
    + gpiod_set_value(pinfo->reset_gpio, 0);
    +
    + ret = panel_set_pinctrl_state(pinfo, false);
    + if (ret) {
    + pr_err("[%s] failed to set pinctrl, rc=%d\n", pinfo->desc->panel_name, ret);
    + return ret;
    + }
    +
    + for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
    + ret = regulator_set_load(pinfo->supplies[i].consumer,
    + regulator_disable_loads[i]);
    + if (ret) {
    + DRM_DEV_ERROR(panel->dev,
    + "regulator_set_load failed %d\n", ret);
    + return ret;
    + }
    + }
    +
    + ret = regulator_bulk_disable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
    + if (ret) {
    + DRM_DEV_ERROR(panel->dev,
    + "regulator_bulk_disable failed %d\n", ret);
    + }
    + return ret;
    +}
    +
    +static int tianma_panel_unprepare(struct drm_panel *panel)
    +{
    + struct panel_info *pinfo = to_panel_info(panel);
    + int ret;
    +
    + if (!pinfo->prepared)
    + return 0;
    +
    + /* send off cmds */
    + ret = send_mipi_cmds(panel, pinfo->desc->off_cmds);
    +
    + if (ret < 0) {
    + DRM_DEV_ERROR(panel->dev,
    + "failed to send DCS off cmds: %d\n", ret);
    + }
    +
    + ret = mipi_dsi_dcs_set_display_off(pinfo->link);
    + if (ret < 0) {
    + DRM_DEV_ERROR(panel->dev,
    + "set_display_off cmd failed ret = %d\n",
    + ret);
    + }
    +
    + /* 120ms delay required here as per DCS spec */
    + msleep(120);
    +
    + ret = mipi_dsi_dcs_enter_sleep_mode(pinfo->link);
    + if (ret < 0) {
    + DRM_DEV_ERROR(panel->dev,
    + "enter_sleep cmd failed ret = %d\n", ret);
    + }
    + /* 0x3C = 60ms delay */
    + msleep(60);
    +
    + ret = tianma_panel_power_off(panel);
    + if (ret < 0)
    + DRM_DEV_ERROR(panel->dev, "power_off failed ret = %d\n", ret);
    +
    + pinfo->prepared = false;
    +
    + return ret;
    +
    +}
    +
    +static int tianma_panel_power_on(struct panel_info *pinfo)
    +{
    + int ret, i;
    +
    + for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
    + ret = regulator_set_load(pinfo->supplies[i].consumer,
    + regulator_enable_loads[i]);
    + if (ret)
    + return ret;
    + }
    +
    + ret = regulator_bulk_enable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
    + if (ret < 0)
    + return ret;
    +
    + ret = panel_set_pinctrl_state(pinfo, true);
    + if (ret) {
    + pr_err("[%s] failed to set pinctrl, rc=%d\n", pinfo->desc->panel_name, ret);
    + return ret;
    + }
    +
    + /*
    + * As per downstream kernel, Reset sequence of Tianma nt36672a panel requires the panel to
    + * be out of reset for 10ms, followed by being held in reset for 10ms. But for Android
    + * AOSP, we needed to bump it upto 200ms otherwise we get white screen sometimes.
    + * FIXME: Try to reduce this 200ms to a lesser value.
    + */
    + gpiod_set_value(pinfo->reset_gpio, 0);
    + msleep(200);
    + gpiod_set_value(pinfo->reset_gpio, 1);
    + msleep(200);
    +
    + return 0;
    +}
    +
    +static int tianma_panel_prepare(struct drm_panel *panel)
    +{
    + struct panel_info *pinfo = to_panel_info(panel);
    + int err;
    +
    + if (pinfo->prepared)
    + return 0;
    +
    + err = tianma_panel_power_on(pinfo);
    + if (err < 0)
    + goto poweroff;
    +
    + /* send first part of init cmds */
    + err = send_mipi_cmds(panel, pinfo->desc->on_cmds_1);
    +
    + if (err < 0) {
    + DRM_DEV_ERROR(panel->dev,
    + "failed to send DCS Init 1st Code: %d\n", err);
    + goto poweroff;
    + }
    +
    + err = mipi_dsi_dcs_set_display_on(pinfo->link);
    + if (err < 0) {
    + DRM_DEV_ERROR(panel->dev,
    + "failed to Set Display ON: %d\n", err);
    + goto poweroff;
    + }
    +
    + err = mipi_dsi_dcs_exit_sleep_mode(pinfo->link);
    + if (err < 0) {
    + DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
    + err);
    + goto poweroff;
    + }
    + /* 0x46 = 70 ms delay */
    + msleep(70);
    +
    + /* Send rest of the init cmds */
    + err = send_mipi_cmds(panel, pinfo->desc->on_cmds_2);
    +
    + if (err < 0) {
    + DRM_DEV_ERROR(panel->dev,
    + "failed to send DCS Init 2nd Code: %d\n", err);
    + goto poweroff;
    + }
    +
    + msleep(120);
    +
    + pinfo->prepared = true;
    +
    + return 0;
    +
    +poweroff:
    + gpiod_set_value(pinfo->reset_gpio, 1);
    + return err;
    +}
    +
    +
    +static int tianma_panel_enable(struct drm_panel *panel)
    +{
    + struct panel_info *pinfo = to_panel_info(panel);
    +
    + if (pinfo->enabled)
    + return 0;
    +
    + pinfo->enabled = true;
    +
    + return 0;
    +}
    +
    +static int tianma_panel_get_modes(struct drm_panel *panel,
    + struct drm_connector *connector)
    +{
    + struct panel_info *pinfo = to_panel_info(panel);
    + const struct drm_display_mode *m = pinfo->desc->display_mode;
    + struct drm_display_mode *mode;
    +
    + mode = drm_mode_duplicate(connector->dev, m);
    + if (!mode) {
    + DRM_DEV_ERROR(panel->dev, "failed to add mode %ux%u@%u\n",
    + m->hdisplay, m->vdisplay, drm_mode_vrefresh(m));
    + return -ENOMEM;
    + }
    +
    + connector->display_info.width_mm = pinfo->desc->width_mm;
    + connector->display_info.height_mm = pinfo->desc->height_mm;
    +
    + drm_mode_set_name(mode);
    + drm_mode_probed_add(connector, mode);
    +
    + return 1;
    +}
    +
    +static const struct drm_panel_funcs panel_funcs = {
    + .disable = tianma_panel_disable,
    + .unprepare = tianma_panel_unprepare,
    + .prepare = tianma_panel_prepare,
    + .enable = tianma_panel_enable,
    + .get_modes = tianma_panel_get_modes,
    +};
    +
    +static const struct panel_cmd tianma_nt36672a_on_cmds_1[] = {
    + /* skin enhancement mode */
    + _INIT_CMD(0x00, 0xFF, 0x22),
    + _INIT_CMD(0x00, 0x00, 0x40),
    + _INIT_CMD(0x00, 0x01, 0xC0),
    + _INIT_CMD(0x00, 0x02, 0x40),
    + _INIT_CMD(0x00, 0x03, 0x40),
    + _INIT_CMD(0x00, 0x04, 0x40),
    + _INIT_CMD(0x00, 0x05, 0x40),
    + _INIT_CMD(0x00, 0x06, 0x40),
    + _INIT_CMD(0x00, 0x07, 0x40),
    + _INIT_CMD(0x00, 0x08, 0x40),
    + _INIT_CMD(0x00, 0x09, 0x40),
    + _INIT_CMD(0x00, 0x0A, 0x40),
    + _INIT_CMD(0x00, 0x0B, 0x40),
    + _INIT_CMD(0x00, 0x0C, 0x40),
    + _INIT_CMD(0x00, 0x0D, 0x40),
    + _INIT_CMD(0x00, 0x0E, 0x40),
    + _INIT_CMD(0x00, 0x0F, 0x40),
    + _INIT_CMD(0x00, 0x10, 0x40),
    + _INIT_CMD(0x00, 0x11, 0x50),
    + _INIT_CMD(0x00, 0x12, 0x60),
    + _INIT_CMD(0x00, 0x13, 0x70),
    + _INIT_CMD(0x00, 0x14, 0x58),
    + _INIT_CMD(0x00, 0x15, 0x68),
    + _INIT_CMD(0x00, 0x16, 0x78),
    + _INIT_CMD(0x00, 0x17, 0x77),
    + _INIT_CMD(0x00, 0x18, 0x39),
    + _INIT_CMD(0x00, 0x19, 0x2D),
    + _INIT_CMD(0x00, 0x1A, 0x2E),
    + _INIT_CMD(0x00, 0x1B, 0x32),
    + _INIT_CMD(0x00, 0x1C, 0x37),
    + _INIT_CMD(0x00, 0x1D, 0x3A),
    + _INIT_CMD(0x00, 0x1E, 0x40),
    + _INIT_CMD(0x00, 0x1F, 0x40),
    + _INIT_CMD(0x00, 0x20, 0x40),
    + _INIT_CMD(0x00, 0x21, 0x40),
    + _INIT_CMD(0x00, 0x22, 0x40),
    + _INIT_CMD(0x00, 0x23, 0x40),
    + _INIT_CMD(0x00, 0x24, 0x40),
    + _INIT_CMD(0x00, 0x25, 0x40),
    + _INIT_CMD(0x00, 0x26, 0x40),
    + _INIT_CMD(0x00, 0x27, 0x40),
    + _INIT_CMD(0x00, 0x28, 0x40),
    + _INIT_CMD(0x00, 0x2D, 0x00),
    + _INIT_CMD(0x00, 0x2F, 0x40),
    + _INIT_CMD(0x00, 0x30, 0x40),
    + _INIT_CMD(0x00, 0x31, 0x40),
    + _INIT_CMD(0x00, 0x32, 0x40),
    + _INIT_CMD(0x00, 0x33, 0x40),
    + _INIT_CMD(0x00, 0x34, 0x40),
    + _INIT_CMD(0x00, 0x35, 0x40),
    + _INIT_CMD(0x00, 0x36, 0x40),
    + _INIT_CMD(0x00, 0x37, 0x40),
    + _INIT_CMD(0x00, 0x38, 0x40),
    + _INIT_CMD(0x00, 0x39, 0x40),
    + _INIT_CMD(0x00, 0x3A, 0x40),
    + _INIT_CMD(0x00, 0x3B, 0x40),
    + _INIT_CMD(0x00, 0x3D, 0x40),
    + _INIT_CMD(0x00, 0x3F, 0x40),
    + _INIT_CMD(0x00, 0x40, 0x40),
    + _INIT_CMD(0x00, 0x41, 0x40),
    + _INIT_CMD(0x00, 0x42, 0x40),
    + _INIT_CMD(0x00, 0x43, 0x40),
    + _INIT_CMD(0x00, 0x44, 0x40),
    + _INIT_CMD(0x00, 0x45, 0x40),
    + _INIT_CMD(0x00, 0x46, 0x40),
    + _INIT_CMD(0x00, 0x47, 0x40),
    + _INIT_CMD(0x00, 0x48, 0x40),
    + _INIT_CMD(0x00, 0x49, 0x40),
    + _INIT_CMD(0x00, 0x4A, 0x40),
    + _INIT_CMD(0x00, 0x4B, 0x40),
    + _INIT_CMD(0x00, 0x4C, 0x40),
    + _INIT_CMD(0x00, 0x4D, 0x40),
    + _INIT_CMD(0x00, 0x4E, 0x40),
    + _INIT_CMD(0x00, 0x4F, 0x40),
    + _INIT_CMD(0x00, 0x50, 0x40),
    + _INIT_CMD(0x00, 0x51, 0x40),
    + _INIT_CMD(0x00, 0x52, 0x40),
    + _INIT_CMD(0x00, 0x53, 0x01),
    + _INIT_CMD(0x00, 0x54, 0x01),
    + _INIT_CMD(0x00, 0x55, 0xFE),
    + _INIT_CMD(0x00, 0x56, 0x77),
    + _INIT_CMD(0x00, 0x58, 0xCD),
    + _INIT_CMD(0x00, 0x59, 0xD0),
    + _INIT_CMD(0x00, 0x5A, 0xD0),
    + _INIT_CMD(0x00, 0x5B, 0x50),
    + _INIT_CMD(0x00, 0x5C, 0x50),
    + _INIT_CMD(0x00, 0x5D, 0x50),
    + _INIT_CMD(0x00, 0x5E, 0x50),
    + _INIT_CMD(0x00, 0x5F, 0x50),
    + _INIT_CMD(0x00, 0x60, 0x50),
    + _INIT_CMD(0x00, 0x61, 0x50),
    + _INIT_CMD(0x00, 0x62, 0x50),
    + _INIT_CMD(0x00, 0x63, 0x50),
    + _INIT_CMD(0x00, 0x64, 0x50),
    + _INIT_CMD(0x00, 0x65, 0x50),
    + _INIT_CMD(0x00, 0x66, 0x50),
    + _INIT_CMD(0x00, 0x67, 0x50),
    + _INIT_CMD(0x00, 0x68, 0x50),
    + _INIT_CMD(0x00, 0x69, 0x50),
    + _INIT_CMD(0x00, 0x6A, 0x50),
    + _INIT_CMD(0x00, 0x6B, 0x50),
    + _INIT_CMD(0x00, 0x6C, 0x50),
    + _INIT_CMD(0x00, 0x6D, 0x50),
    + _INIT_CMD(0x00, 0x6E, 0x50),
    + _INIT_CMD(0x00, 0x6F, 0x50),
    + _INIT_CMD(0x00, 0x70, 0x07),
    + _INIT_CMD(0x00, 0x71, 0x00),
    + _INIT_CMD(0x00, 0x72, 0x00),
    + _INIT_CMD(0x00, 0x73, 0x00),
    + _INIT_CMD(0x00, 0x74, 0x06),
    + _INIT_CMD(0x00, 0x75, 0x0C),
    + _INIT_CMD(0x00, 0x76, 0x03),
    + _INIT_CMD(0x00, 0x77, 0x09),
    + _INIT_CMD(0x00, 0x78, 0x0F),
    + _INIT_CMD(0x00, 0x79, 0x68),
    + _INIT_CMD(0x00, 0x7A, 0x88),
    + _INIT_CMD(0x00, 0x7C, 0x80),
    + _INIT_CMD(0x00, 0x7D, 0x80),
    + _INIT_CMD(0x00, 0x7E, 0x80),
    + _INIT_CMD(0x00, 0x7F, 0x00),
    + _INIT_CMD(0x00, 0x80, 0x00),
    + _INIT_CMD(0x00, 0x81, 0x00),
    + _INIT_CMD(0x00, 0x83, 0x01),
    + _INIT_CMD(0x00, 0x84, 0x00),
    + _INIT_CMD(0x00, 0x85, 0x80),
    + _INIT_CMD(0x00, 0x86, 0x80),
    + _INIT_CMD(0x00, 0x87, 0x80),
    + _INIT_CMD(0x00, 0x88, 0x40),
    + _INIT_CMD(0x00, 0x89, 0x91),
    + _INIT_CMD(0x00, 0x8A, 0x98),
    + _INIT_CMD(0x00, 0x8B, 0x80),
    + _INIT_CMD(0x00, 0x8C, 0x80),
    + _INIT_CMD(0x00, 0x8D, 0x80),
    + _INIT_CMD(0x00, 0x8E, 0x80),
    + _INIT_CMD(0x00, 0x8F, 0x80),
    + _INIT_CMD(0x00, 0x90, 0x80),
    + _INIT_CMD(0x00, 0x91, 0x80),
    + _INIT_CMD(0x00, 0x92, 0x80),
    + _INIT_CMD(0x00, 0x93, 0x80),
    + _INIT_CMD(0x00, 0x94, 0x80),
    + _INIT_CMD(0x00, 0x95, 0x80),
    + _INIT_CMD(0x00, 0x96, 0x80),
    + _INIT_CMD(0x00, 0x97, 0x80),
    + _INIT_CMD(0x00, 0x98, 0x80),
    + _INIT_CMD(0x00, 0x99, 0x80),
    + _INIT_CMD(0x00, 0x9A, 0x80),
    + _INIT_CMD(0x00, 0x9B, 0x80),
    + _INIT_CMD(0x00, 0x9C, 0x80),
    + _INIT_CMD(0x00, 0x9D, 0x80),
    + _INIT_CMD(0x00, 0x9E, 0x80),
    + _INIT_CMD(0x00, 0x9F, 0x80),
    + _INIT_CMD(0x00, 0xA0, 0x8A),
    + _INIT_CMD(0x00, 0xA2, 0x80),
    + _INIT_CMD(0x00, 0xA6, 0x80),
    + _INIT_CMD(0x00, 0xA7, 0x80),
    + _INIT_CMD(0x00, 0xA9, 0x80),
    + _INIT_CMD(0x00, 0xAA, 0x80),
    + _INIT_CMD(0x00, 0xAB, 0x80),
    + _INIT_CMD(0x00, 0xAC, 0x80),
    + _INIT_CMD(0x00, 0xAD, 0x80),
    + _INIT_CMD(0x00, 0xAE, 0x80),
    + _INIT_CMD(0x00, 0xAF, 0x80),
    + _INIT_CMD(0x00, 0xB7, 0x76),
    + _INIT_CMD(0x00, 0xB8, 0x76),
    + _INIT_CMD(0x00, 0xB9, 0x05),
    + _INIT_CMD(0x00, 0xBA, 0x0D),
    + _INIT_CMD(0x00, 0xBB, 0x14),
    + _INIT_CMD(0x00, 0xBC, 0x0F),
    + _INIT_CMD(0x00, 0xBD, 0x18),
    + _INIT_CMD(0x00, 0xBE, 0x1F),
    + _INIT_CMD(0x00, 0xBF, 0x05),
    + _INIT_CMD(0x00, 0xC0, 0x0D),
    + _INIT_CMD(0x00, 0xC1, 0x14),
    + _INIT_CMD(0x00, 0xC2, 0x03),
    + _INIT_CMD(0x00, 0xC3, 0x07),
    + _INIT_CMD(0x00, 0xC4, 0x0A),
    + _INIT_CMD(0x00, 0xC5, 0xA0),
    + _INIT_CMD(0x00, 0xC6, 0x55),
    + _INIT_CMD(0x00, 0xC7, 0xFF),
    + _INIT_CMD(0x00, 0xC8, 0x39),
    + _INIT_CMD(0x00, 0xC9, 0x44),
    + _INIT_CMD(0x00, 0xCA, 0x12),
    + _INIT_CMD(0x00, 0xCD, 0x80),
    + _INIT_CMD(0x00, 0xDB, 0x80),
    + _INIT_CMD(0x00, 0xDC, 0x80),
    + _INIT_CMD(0x00, 0xDD, 0x80),
    + _INIT_CMD(0x00, 0xE0, 0x80),
    + _INIT_CMD(0x00, 0xE1, 0x80),
    + _INIT_CMD(0x00, 0xE2, 0x80),
    + _INIT_CMD(0x00, 0xE3, 0x80),
    + _INIT_CMD(0x00, 0xE4, 0x80),
    + _INIT_CMD(0x00, 0xE5, 0x40),
    + _INIT_CMD(0x00, 0xE6, 0x40),
    + _INIT_CMD(0x00, 0xE7, 0x40),
    + _INIT_CMD(0x00, 0xE8, 0x40),
    + _INIT_CMD(0x00, 0xE9, 0x40),
    + _INIT_CMD(0x00, 0xEA, 0x40),
    + _INIT_CMD(0x00, 0xEB, 0x40),
    + _INIT_CMD(0x00, 0xEC, 0x40),
    + _INIT_CMD(0x00, 0xED, 0x40),
    + _INIT_CMD(0x00, 0xEE, 0x40),
    + _INIT_CMD(0x00, 0xEF, 0x40),
    + _INIT_CMD(0x00, 0xF0, 0x40),
    + _INIT_CMD(0x00, 0xF1, 0x40),
    + _INIT_CMD(0x00, 0xF2, 0x40),
    + _INIT_CMD(0x00, 0xF3, 0x40),
    + _INIT_CMD(0x00, 0xF4, 0x40),
    + _INIT_CMD(0x00, 0xF5, 0x40),
    + _INIT_CMD(0x00, 0xF6, 0x40),
    + _INIT_CMD(0x00, 0xFB, 0x1),
    + _INIT_CMD(0x00, 0xFF, 0x23),
    + _INIT_CMD(0x00, 0xFB, 0x01),
    + /* dimming enable */
    + _INIT_CMD(0x00, 0x01, 0x84),
    + _INIT_CMD(0x00, 0x05, 0x2D),
    + _INIT_CMD(0x00, 0x06, 0x00),
    + /* resolution 1080*2246 */
    + _INIT_CMD(0x00, 0x11, 0x01),
    + _INIT_CMD(0x00, 0x12, 0x7B),
    + _INIT_CMD(0x00, 0x15, 0x6F),
    + _INIT_CMD(0x00, 0x16, 0x0B),
    + /* UI mode */
    + _INIT_CMD(0x00, 0x29, 0x0A),
    + _INIT_CMD(0x00, 0x30, 0xFF),
    + _INIT_CMD(0x00, 0x31, 0xFF),
    + _INIT_CMD(0x00, 0x32, 0xFF),
    + _INIT_CMD(0x00, 0x33, 0xFF),
    + _INIT_CMD(0x00, 0x34, 0xFF),
    + _INIT_CMD(0x00, 0x35, 0xFF),
    + _INIT_CMD(0x00, 0x36, 0xFF),
    + _INIT_CMD(0x00, 0x37, 0xFF),
    + _INIT_CMD(0x00, 0x38, 0xFC),
    + _INIT_CMD(0x00, 0x39, 0xF8),
    + _INIT_CMD(0x00, 0x3A, 0xF4),
    + _INIT_CMD(0x00, 0x3B, 0xF1),
    + _INIT_CMD(0x00, 0x3D, 0xEE),
    + _INIT_CMD(0x00, 0x3F, 0xEB),
    + _INIT_CMD(0x00, 0x40, 0xE8),
    + _INIT_CMD(0x00, 0x41, 0xE5),
    + /* STILL mode */
    + _INIT_CMD(0x00, 0x2A, 0x13),
    + _INIT_CMD(0x00, 0x45, 0xFF),
    + _INIT_CMD(0x00, 0x46, 0xFF),
    + _INIT_CMD(0x00, 0x47, 0xFF),
    + _INIT_CMD(0x00, 0x48, 0xFF),
    + _INIT_CMD(0x00, 0x49, 0xFF),
    + _INIT_CMD(0x00, 0x4A, 0xFF),
    + _INIT_CMD(0x00, 0x4B, 0xFF),
    + _INIT_CMD(0x00, 0x4C, 0xFF),
    + _INIT_CMD(0x00, 0x4D, 0xED),
    + _INIT_CMD(0x00, 0x4E, 0xD5),
    + _INIT_CMD(0x00, 0x4F, 0xBF),
    + _INIT_CMD(0x00, 0x50, 0xA6),
    + _INIT_CMD(0x00, 0x51, 0x96),
    + _INIT_CMD(0x00, 0x52, 0x86),
    + _INIT_CMD(0x00, 0x53, 0x76),
    + _INIT_CMD(0x00, 0x54, 0x66),
    + /* MOVING mode */
    + _INIT_CMD(0x00, 0x2B, 0x0E),
    + _INIT_CMD(0x00, 0x58, 0xFF),
    + _INIT_CMD(0x00, 0x59, 0xFF),
    + _INIT_CMD(0x00, 0x5A, 0xFF),
    + _INIT_CMD(0x00, 0x5B, 0xFF),
    + _INIT_CMD(0x00, 0x5C, 0xFF),
    + _INIT_CMD(0x00, 0x5D, 0xFF),
    + _INIT_CMD(0x00, 0x5E, 0xFF),
    + _INIT_CMD(0x00, 0x5F, 0xFF),
    + _INIT_CMD(0x00, 0x60, 0xF6),
    + _INIT_CMD(0x00, 0x61, 0xEA),
    + _INIT_CMD(0x00, 0x62, 0xE1),
    + _INIT_CMD(0x00, 0x63, 0xD8),
    + _INIT_CMD(0x00, 0x64, 0xCE),
    + _INIT_CMD(0x00, 0x65, 0xC3),
    + _INIT_CMD(0x00, 0x66, 0xBA),
    + _INIT_CMD(0x00, 0x67, 0xB3),
    + _INIT_CMD(0x00, 0xFF, 0x25),
    + _INIT_CMD(0x00, 0xFB, 0x01),
    + _INIT_CMD(0x00, 0x05, 0x04),
    + _INIT_CMD(0x00, 0xFF, 0x26),
    + _INIT_CMD(0x00, 0xFB, 0x01),
    + _INIT_CMD(0x00, 0x1C, 0xAF),
    + _INIT_CMD(0x00, 0xFF, 0x10),
    + _INIT_CMD(0x00, 0xFB, 0x01),
    + _INIT_CMD(0x00, 0x51, 0xFF),
    + _INIT_CMD(0x00, 0x53, 0x24),
    + _INIT_CMD(0x00, 0x55, 0x00),
    +
    + {},
    +};
    +
    +static const struct panel_cmd tianma_nt36672a_on_cmds_2[] = {
    + _INIT_CMD(0x00, 0xFF, 0x24),
    + _INIT_CMD(0x00, 0xFB, 0x01),
    + _INIT_CMD(0x00, 0xC3, 0x01),
    + _INIT_CMD(0x00, 0xC4, 0x54),
    + _INIT_CMD(0x00, 0xFF, 0x10),
    +
    + {},
    +};
    +
    +static const struct panel_cmd tianma_nt36672a_off_cmds[] = {
    + _INIT_CMD(0x00, 0xFF, 0x24),
    + _INIT_CMD(0x00, 0xFB, 0x01),
    + _INIT_CMD(0x00, 0xC3, 0x01),
    + _INIT_CMD(0x00, 0xFF, 0x10),
    +
    + {},
    +};
    +
    +static const struct drm_display_mode tianma_panel_default_mode = {
    + .clock = 161331,
    +
    + .hdisplay = 1080,
    + .hsync_start = 1080 + 40,
    + .hsync_end = 1080 + 40 + 20,
    + .htotal = 1080 + 40 + 20 + 44,
    +
    + .vdisplay = 2246,
    + .vsync_start = 2246 + 15,
    + .vsync_end = 2246 + 15 + 2,
    + .vtotal = 2246 + 15 + 2 + 8,
    +
    + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
    +};
    +
    +static const struct panel_desc tianma_panel_desc = {
    + .display_mode = &tianma_panel_default_mode,
    +
    + .width_mm = 68,
    + .height_mm = 136,
    +
    + .mode_flags = MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_VIDEO
    + | MIPI_DSI_MODE_VIDEO_HSE
    + | MIPI_DSI_CLOCK_NON_CONTINUOUS
    + | MIPI_DSI_MODE_VIDEO_BURST,
    + .format = MIPI_DSI_FMT_RGB888,
    + .lanes = 4,
    + .on_cmds_1 = tianma_nt36672a_on_cmds_1,
    + .on_cmds_2 = tianma_nt36672a_on_cmds_2,
    + .off_cmds = tianma_nt36672a_off_cmds
    +};
    +
    +
    +static const struct of_device_id panel_of_match[] = {
    + { .compatible = "tianma,nt36672a",
    + .data = &tianma_panel_desc
    + },
    + {
    + /* sentinel */
    + }
    +};
    +MODULE_DEVICE_TABLE(of, panel_of_match);
    +
    +
    +static int panel_pinctrl_init(struct panel_info *panel)
    +{
    + struct device *dev = &panel->link->dev;
    + int rc = 0;
    +
    + panel->pinctrl = devm_pinctrl_get(dev);
    + if (IS_ERR_OR_NULL(panel->pinctrl)) {
    + rc = PTR_ERR(panel->pinctrl);
    + pr_err("failed to get pinctrl, rc=%d\n", rc);
    + goto error;
    + }
    +
    + panel->active = pinctrl_lookup_state(panel->pinctrl,
    + "panel_active");
    + if (IS_ERR_OR_NULL(panel->active)) {
    + rc = PTR_ERR(panel->active);
    + pr_err("failed to get pinctrl active state, rc=%d\n", rc);
    + goto error;
    + }
    +
    + panel->suspend =
    + pinctrl_lookup_state(panel->pinctrl, "panel_suspend");
    +
    + if (IS_ERR_OR_NULL(panel->suspend)) {
    + rc = PTR_ERR(panel->suspend);
    + pr_err("failed to get pinctrl suspend state, rc=%d\n", rc);
    + goto error;
    + }
    +
    +error:
    + return rc;
    +}
    +
    +static int panel_add(struct panel_info *pinfo)
    +{
    + struct device *dev = &pinfo->link->dev;
    + int i, ret;
    +
    + for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++)
    + pinfo->supplies[i].supply = regulator_names[i];
    +
    + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pinfo->supplies),
    + pinfo->supplies);
    + if (ret < 0)
    + return ret;
    +
    + pinfo->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
    + if (IS_ERR(pinfo->reset_gpio)) {
    + DRM_DEV_ERROR(dev, "cannot get reset gpio %ld\n",
    + PTR_ERR(pinfo->reset_gpio));
    + return PTR_ERR(pinfo->reset_gpio);
    + }
    +
    + ret = panel_pinctrl_init(pinfo);
    + if (ret < 0)
    + return ret;
    +
    + drm_panel_init(&pinfo->base, dev, &panel_funcs,
    + DRM_MODE_CONNECTOR_DSI);
    +
    + ret = drm_panel_add(&pinfo->base);
    + if (ret < 0)
    + return ret;
    + return 0;
    +}
    +
    +static void panel_del(struct panel_info *pinfo)
    +{
    + if (pinfo->base.dev)
    + drm_panel_remove(&pinfo->base);
    +}
    +
    +static int panel_probe(struct mipi_dsi_device *dsi)
    +{
    + struct panel_info *pinfo;
    + const struct panel_desc *desc;
    + int err;
    +
    + pinfo = devm_kzalloc(&dsi->dev, sizeof(*pinfo), GFP_KERNEL);
    + if (!pinfo)
    + return -ENOMEM;
    +
    + desc = of_device_get_match_data(&dsi->dev);
    + dsi->mode_flags = desc->mode_flags;
    + dsi->format = desc->format;
    + dsi->lanes = desc->lanes;
    + pinfo->desc = desc;
    + pinfo->link = dsi;
    +
    + mipi_dsi_set_drvdata(dsi, pinfo);
    +
    + err = panel_add(pinfo);
    + if (err < 0)
    + return err;
    +
    + err = mipi_dsi_attach(dsi);
    + return err;
    +}
    +
    +static int panel_remove(struct mipi_dsi_device *dsi)
    +{
    + struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
    + int err;
    +
    + err = tianma_panel_unprepare(&pinfo->base);
    + if (err < 0)
    + DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
    + err);
    +
    + err = tianma_panel_disable(&pinfo->base);
    + if (err < 0)
    + DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
    +
    + err = mipi_dsi_detach(dsi);
    + if (err < 0)
    + DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
    + err);
    +
    + drm_panel_detach(&pinfo->base);
    + panel_del(pinfo);
    +
    + return 0;
    +}
    +
    +static void panel_shutdown(struct mipi_dsi_device *dsi)
    +{
    + struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
    +
    + tianma_panel_disable(&pinfo->base);
    + tianma_panel_unprepare(&pinfo->base);
    +}
    +
    +static struct mipi_dsi_driver panel_driver = {
    + .driver = {
    + .name = "panel-tianma-nt36672a",
    + .of_match_table = panel_of_match,
    + },
    + .probe = panel_probe,
    + .remove = panel_remove,
    + .shutdown = panel_shutdown,
    +};
    +module_mipi_dsi_driver(panel_driver);
    +
    +MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
    +MODULE_DESCRIPTION("TIANMA NT36672A MIPI-DSI LCD panel");
    +MODULE_LICENSE("GPL");
    --
    2.28.0
    \
     
     \ /
      Last update: 2020-08-11 20:22    [W:3.023 / U:0.012 seconds]
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