Re: [RESEND][PATCH] drm/panel: Add JDI LT070ME05000 WUXGA DSI Panel

On Thu, Apr 14, 2016 at 04:17:45PM +0530, Vinay Simha BN wrote:

Add support for the JDI lt070me05000 WUXGA DSI panel used in Nexus 7 2013 devices.

Programming sequence for the panel is was originally found in the android-msm-flo-3.4-lollipop-release branch from: https://android.googlesource.com/kernel/msm.git

And video mode setting is from dsi-panel-jdi-dualmipi1-video.dtsi file in: git://codeaurora.org/kernel/msm-3.10.git LNX.LA.3.6_rb1.27

Other fixes folded in were provided by Archit Taneja archit.taneja@gmail.com

Cc: Archit Taneja archit.taneja@gmail.com Signed-off-by: Vinay Simha BN simhavcs@gmail.com [sumit.semwal: Ported to the drm/panel framework] Signed-off-by: Sumit Semwal sumit.semwal@linaro.org [jstultz: Cherry-picked to mainline, folded down other fixes from Vinay and Archit] Signed-off-by: John Stultz john.stultz@linaro.org Acked-by: John Stultz john.stultz@linaro.org [vinay simha bn: added interface setting cmd mode, cmd or video mode panel setting selection in panel_init based on mode_flags] Signed-off-by: Vinay Simha BN simhavcs@gmail.com

---

.../bindings/display/panel/jdi,lt070me05000.txt | 27 + .../devicetree/bindings/vendor-prefixes.txt | 1 + drivers/gpu/drm/panel/Kconfig | 11 + drivers/gpu/drm/panel/Makefile | 1 + drivers/gpu/drm/panel/panel-jdi-lt070me05000.c | 685 +++++++++++++++++++++ 5 files changed, 725 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt create mode 100644 drivers/gpu/drm/panel/panel-jdi-lt070me05000.c

diff --git a/Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt b/Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt new file mode 100644 index 0000000..35c5ac7 --- /dev/null +++ b/Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt @@ -0,0 +1,27 @@ +JDI model LT070ME05000 1920x1200 7" DSI Panel

+Basic data sheet is at:

• http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet

+This panel has video mode implemented currently in the driver.

As Thierry already mentioned, this has nothing to do with the binding.

+Required properties: +- compatible: should be "jdi,lt070me05000"

+Optional properties: +- power-supply: phandle of the regulator that provides the supply voltage +- reset-gpio: phandle of gpio for reset line

reset-gpios

+- backlight: phandle of the backlight device attached to the panel

+Example:

• dsi@54300000 {

• panel: panel@0 {
  

• 	compatible = "jdi,lt070me05000";
  

• 	reg = <0>;
  

• 	power-supply = <...>;
  

• 	reset-gpio = <...>;
  

• 	backlight = <...>;
  

• };
  

• };

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt index a580f3e..ec42bb4 100644 --- a/Documentation/devicetree/bindings/vendor-prefixes.txt +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt @@ -130,6 +130,7 @@ invensense InvenSense Inc. isee ISEE 2007 S.L. isil Intersil issi Integrated Silicon Solutions Inc. +jdi Japan Display Inc. jedec JEDEC Solid State Technology Association karo Ka-Ro electronics GmbH keymile Keymile GmbH diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index 1500ab9..f41690e 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -61,6 +61,17 @@ config DRM_PANEL_SHARP_LQ101R1SX01 To compile this driver as a module, choose M here: the module will be called panel-sharp-lq101r1sx01.

+config DRM_PANEL_JDI_LT070ME05000

• tristate "JDI LT070ME05000 WUXGA DSI 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 JDI WUXGA DSI video/
  

•  command mode panel as found in Google Nexus 7 (2013) devices.
  

•  The panel has a 1200(RGB)×1920 (WUXGA) resolution and uses
  

•  24 bit RGB per pixel.
  

config DRM_PANEL_SHARP_LS043T1LE01 tristate "Sharp LS043T1LE01 qHD video mode panel" depends on OF diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile index f277eed..e6c6fc8 100644 --- a/drivers/gpu/drm/panel/Makefile +++ b/drivers/gpu/drm/panel/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o +obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o diff --git a/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c new file mode 100644 index 0000000..051aa1b --- /dev/null +++ b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c @@ -0,0 +1,685 @@ +/*

• • Copyright (C) 2015 InforceComputing
• • Author: Vinay Simha BN simhavcs@gmail.com
• • Copyright (C) 2015 Linaro Ltd
• • Author: Sumit Semwal sumit.semwal@linaro.org
• • 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.
• • This program is distributed in the hope that it will be useful, but WITHOUT
• • ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
• • FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
• • more details.
• • You should have received a copy of the GNU General Public License along with
• • this program. If not, see http://www.gnu.org/licenses/.
• */

+#include <linux/backlight.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/regulator/consumer.h>

+#include <drm/drmP.h> +#include <drm/drm_crtc.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_panel.h>

+#include <video/mipi_display.h>

+/*

• • From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
• • JDI model LT070ME05000, and its data sheet is at:
• • http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
• */

+struct jdi_panel {

• struct drm_panel base;
• struct mipi_dsi_device *dsi;
• /* TODO: Add backilght support */
• struct backlight_device *backlight;
• struct regulator *supply;
• struct gpio_desc *reset_gpio;
• struct gpio_desc *enable_gpio;
• struct gpio_desc *vcc_gpio;
• struct regulator *backlit;
• struct regulator *lvs7;
• struct regulator *avdd;
• struct regulator *iovdd;
• struct gpio_desc *pwm_gpio;
• bool prepared;
• bool enabled;
• const struct drm_display_mode *mode;

+};

+static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel) +{

• return container_of(panel, struct jdi_panel, base);

+}

+static char MCAP[2] = {0xB0, 0x00}; +static char interface_setting_cmd[6] = {0xB3, 0x04, 0x08, 0x00, 0x22, 0x00}; +static char interface_setting[6] = {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00};

+static char interface_ID_setting[2] = {0xB4, 0x0C}; +static char DSI_control[3] = {0xB6, 0x3A, 0xD3};

+static char tear_scan_line[3] = {0x44, 0x03, 0x00};

+/* for fps control, set fps to 60.32Hz */ +static char LTPS_timing_setting[2] = {0xC6, 0x78}; +static char sequencer_timing_control[2] = {0xD6, 0x01};

+/* set brightness */ +static char write_display_brightness[] = {0x51, 0xFF}; +/* enable LEDPWM pin output, turn on LEDPWM output, turn off pwm dimming */ +static char write_control_display[] = {0x53, 0x24}; +/*

• • choose cabc mode, 0x00(-0%), 0x01(-15%), 0x02(-40%), 0x03(-54%),
• • disable SRE(sunlight readability enhancement)
• */

+static char write_cabc[] = {0x55, 0x00}; +/* for cabc mode 0x1(-15%) */ +static char backlight_control1[] = {0xB8, 0x07, 0x87, 0x26, 0x18, 0x00, 0x32}; +/* for cabc mode 0x2(-40%) */ +static char backlight_control2[] = {0xB9, 0x07, 0x75, 0x61, 0x20, 0x16, 0x87}; +/* for cabc mode 0x3(-54%) */ +static char backlight_control3[] = {0xBA, 0x07, 0x70, 0x81, 0x20, 0x45, 0xB4}; +/* for pwm frequency and dimming control */ +static char backlight_control4[] = {0xCE, 0x7D, 0x40, 0x48, 0x56, 0x67, 0x78,

• 0x88, 0x98, 0xA7, 0xB5, 0xC3, 0xD1, 0xDE, 0xE9, 0xF2, 0xFA,
  

• 0xFF, 0x37, 0xF5, 0x0F, 0x0F, 0x42, 0x00};
  

+static int jdi_panel_init(struct jdi_panel *jdi) +{

• struct mipi_dsi_device *dsi = jdi->dsi;
• int ret;
• dsi->mode_flags |= MIPI_DSI_MODE_LPM;
• if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {

• ret = mipi_dsi_dcs_soft_reset(dsi);
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(10);
  

• ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x70);
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_set_column_address(dsi, 0x0000, 0x04AF);
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_set_page_address(dsi, 0x0000, 0x077F);
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_set_tear_on(dsi,
  

• 			       MIPI_DSI_DCS_TEAR_MODE_VBLANK);
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(5);
  

• ret = mipi_dsi_generic_write(dsi, tear_scan_line,
  

• 			     sizeof(tear_scan_line));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_write_buffer(dsi, write_display_brightness,
  

• 				sizeof(write_display_brightness)
  

• 				);
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_write_buffer(dsi, write_control_display,
  

• 				sizeof(write_control_display));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_write_buffer(dsi, write_cabc,
  

• 				sizeof(write_cabc));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(120);
  

• ret = mipi_dsi_generic_write(dsi, MCAP, sizeof(MCAP));
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(10);
  

• ret = mipi_dsi_generic_write(dsi, interface_setting,
  

• 			     sizeof(interface_setting));
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(20);
  

• backlight_control4[18] = 0x04;
  

• backlight_control4[19] = 0x00;
  

• ret = mipi_dsi_generic_write(dsi, backlight_control4,
  

• 			     sizeof(backlight_control4));
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(20);
  

• MCAP[1] = 0x03;
  

• ret = mipi_dsi_generic_write(dsi, MCAP, sizeof(MCAP));
  

• if (ret < 0)
  

• 	return ret;
  

• } else {

• /*
  

•  * TODO : need to verify panel settings when
  

•  * dsi cmd mode supported for apq8064 - simhavcs
  

•  */
  

• ret = mipi_dsi_dcs_soft_reset(dsi);
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(5);
  

• ret = mipi_dsi_generic_write(dsi, MCAP, sizeof(MCAP));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, interface_setting_cmd,
  

• 			     sizeof(interface_setting_cmd));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, interface_ID_setting,
  

• 			     sizeof(interface_ID_setting));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, DSI_control,
  

• 			     sizeof(DSI_control));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, LTPS_timing_setting,
  

• 			     sizeof(LTPS_timing_setting));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, sequencer_timing_control,
  

• 			     sizeof(sequencer_timing_control));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_write_buffer(dsi, write_display_brightness,
  

• 				sizeof(write_display_brightness)
  

• 				);
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_write_buffer(dsi, write_control_display,
  

• 				sizeof(write_control_display));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_write_buffer(dsi, write_cabc,
  

• 				sizeof(write_cabc));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, backlight_control1,
  

• 			     sizeof(backlight_control1));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, backlight_control2,
  

• 			     sizeof(backlight_control2));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, backlight_control3,
  

• 			     sizeof(backlight_control3));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_generic_write(dsi, backlight_control4,
  

• 			     sizeof(backlight_control4));
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x77);
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_set_column_address(dsi, 0x0000, 0x04AF);
  

• if (ret < 0)
  

• 	return ret;
  

• ret = mipi_dsi_dcs_set_page_address(dsi, 0x0000, 0x077F);
  

• if (ret < 0)
  

• 	return ret;
  

• mdelay(120);
  

• ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
  

• if (ret < 0)
  

• 	return ret;
  

• }
• return 0;

+}

+static int jdi_panel_on(struct jdi_panel *jdi) +{

• struct mipi_dsi_device *dsi = jdi->dsi;
• int ret;
• dsi->mode_flags |= MIPI_DSI_MODE_LPM;
• ret = mipi_dsi_dcs_set_display_on(dsi);
• if (ret < 0)

• return ret;
  

• return 0;

+}

+static int jdi_panel_off(struct jdi_panel *jdi) +{

• struct mipi_dsi_device *dsi = jdi->dsi;
• int ret;
• dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
• ret = mipi_dsi_dcs_set_display_off(dsi);
• if (ret < 0)

• return ret;
  

• ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
• if (ret < 0)

• return ret;
  

• ret = mipi_dsi_dcs_set_tear_off(dsi);
• if (ret < 0)

• return ret;
  

• msleep(100);
• return 0;

+}

+static int jdi_panel_disable(struct drm_panel *panel) +{

• struct jdi_panel *jdi = to_jdi_panel(panel);
• if (!jdi->enabled)

• return 0;
  

• DRM_DEBUG("disable\n");
• if (jdi->backlight) {

• jdi->backlight->props.power = FB_BLANK_POWERDOWN;
  

• backlight_update_status(jdi->backlight);
  

• }
• jdi->enabled = false;
• return 0;

+}

+static int jdi_panel_unprepare(struct drm_panel *panel) +{

• struct jdi_panel *jdi = to_jdi_panel(panel);
• int ret;
• if (!jdi->prepared)

• return 0;
  

• DRM_DEBUG("unprepare\n");
• ret = jdi_panel_off(jdi);
• if (ret) {

• dev_err(panel->dev, "failed to set panel off: %d\n", ret);
  

• return ret;
  

• }
• regulator_disable(jdi->supply);
• if (jdi->vcc_gpio)

• gpiod_set_value(jdi->vcc_gpio, 0);
  

• if (jdi->reset_gpio)

• gpiod_set_value(jdi->reset_gpio, 0);
  

• if (jdi->enable_gpio)

• gpiod_set_value(jdi->enable_gpio, 0);
  

• jdi->prepared = false;
• return 0;

+}

+static int jdi_panel_prepare(struct drm_panel *panel) +{

• struct jdi_panel *jdi = to_jdi_panel(panel);
• int ret;
• if (jdi->prepared)

• return 0;
  

• DRM_DEBUG("prepare\n");
• ret = regulator_enable(jdi->iovdd);
• if (ret < 0)

• return ret;
  

• ret = regulator_enable(jdi->avdd);
• if (ret < 0)

• return ret;
  

• ret = regulator_enable(jdi->backlit);
• if (ret < 0)

• return ret;
  

• ret = regulator_enable(jdi->lvs7);
• if (ret < 0)

• return ret;
  

• ret = regulator_enable(jdi->supply);
• if (ret < 0)

• return ret;
  

• msleep(20);
• if (jdi->vcc_gpio) {

• gpiod_set_value(jdi->vcc_gpio, 1);
  

• usleep_range(10, 20);
  

• }
• if (jdi->reset_gpio) {

• gpiod_set_value(jdi->reset_gpio, 1);
  

• usleep_range(10, 20);
  

• }
• if (jdi->pwm_gpio) {

• gpiod_set_value(jdi->pwm_gpio, 1);
  

• usleep_range(10, 20);
  

• }
• if (jdi->enable_gpio) {

• gpiod_set_value(jdi->enable_gpio, 1);
  

• usleep_range(10, 20);
  

• }
• ret = jdi_panel_init(jdi);
• if (ret) {

• dev_err(panel->dev, "failed to init panel: %d\n", ret);
  

• goto poweroff;
  

• }
• ret = jdi_panel_on(jdi);
• if (ret) {

• dev_err(panel->dev, "failed to set panel on: %d\n", ret);
  

• goto poweroff;
  

• }
• jdi->prepared = true;
• return 0;

+poweroff:

• regulator_disable(jdi->supply);
• if (jdi->reset_gpio)

• gpiod_set_value(jdi->reset_gpio, 0);
  

• if (jdi->enable_gpio)

• gpiod_set_value(jdi->enable_gpio, 0);
  

• if (jdi->vcc_gpio)

• gpiod_set_value(jdi->vcc_gpio, 0);
  

• return ret;

+}

+static int jdi_panel_enable(struct drm_panel *panel) +{

• struct jdi_panel *jdi = to_jdi_panel(panel);
• if (jdi->enabled)

• return 0;
  

• DRM_DEBUG("enable\n");
• if (jdi->backlight) {

• jdi->backlight->props.power = FB_BLANK_UNBLANK;
  

• backlight_update_status(jdi->backlight);
  

• }
• jdi->enabled = true;
• return 0;

+}

+static const struct drm_display_mode default_mode = {

• .clock = 155000,
  

• .hdisplay = 1200,
  

• .hsync_start = 1200 + 48,
  

• .hsync_end = 1200 + 48 + 32,
  

• .htotal = 1200 + 48 + 32 + 60,
  

• .vdisplay = 1920,
  

• .vsync_start = 1920 + 3,
  

• .vsync_end = 1920 + 3 + 5,
  

• .vtotal = 1920 + 3 + 5 + 6,
  

• .vrefresh = 60,
  

• .flags = 0,
  

+};

+static int jdi_panel_get_modes(struct drm_panel *panel) +{

• struct drm_display_mode *mode;
• mode = drm_mode_duplicate(panel->drm, &default_mode);
• if (!mode) {

• dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
  

• 	default_mode.hdisplay, default_mode.vdisplay,
  

• 	default_mode.vrefresh);
  

• return -ENOMEM;
  

• }
• drm_mode_set_name(mode);
• drm_mode_probed_add(panel->connector, mode);
• return 1;

+}

+static const struct drm_panel_funcs jdi_panel_funcs = {

• .disable = jdi_panel_disable,
  

• .unprepare = jdi_panel_unprepare,
  

• .prepare = jdi_panel_prepare,
  

• .enable = jdi_panel_enable,
  

• .get_modes = jdi_panel_get_modes,
  

+};

+static const struct of_device_id jdi_of_match[] = {

• { .compatible = "jdi,lt070me05000", },
  

• { }
  

+}; +MODULE_DEVICE_TABLE(of, jdi_of_match);

+static int jdi_panel_add(struct jdi_panel *jdi) +{

• struct device *dev = &jdi->dsi->dev;
• int ret;
• jdi->mode = &default_mode;
• /* lvs5 */
• jdi->supply = devm_regulator_get(dev, "power");
• if (IS_ERR(jdi->supply))

• return PTR_ERR(jdi->supply);
  

• /* l17 */
• jdi->backlit = devm_regulator_get(dev, "backlit");
• if (IS_ERR(jdi->supply))

• return PTR_ERR(jdi->supply);
  

• jdi->lvs7 = devm_regulator_get(dev, "lvs7");
• if (IS_ERR(jdi->lvs7))

• return PTR_ERR(jdi->lvs7);
  

• jdi->avdd = devm_regulator_get(dev, "avdd");
• if (IS_ERR(jdi->avdd))

• return PTR_ERR(jdi->avdd);
  

• jdi->iovdd = devm_regulator_get(dev, "iovdd");
• if (IS_ERR(jdi->iovdd))

• return PTR_ERR(jdi->iovdd);
  

• jdi->vcc_gpio = devm_gpiod_get(dev, "vcc", GPIOD_OUT_LOW);
• if (IS_ERR(jdi->vcc_gpio)) {

• dev_err(dev, "cannot get vcc-gpio %ld\n",
  

• 	PTR_ERR(jdi->vcc_gpio));
  

• jdi->vcc_gpio = NULL;
  

• } else {

• gpiod_direction_output(jdi->vcc_gpio, 0);
  

• }
• jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
• if (IS_ERR(jdi->reset_gpio)) {

• dev_err(dev, "cannot get reset-gpios %ld\n",
  

• 	PTR_ERR(jdi->reset_gpio));
  

• jdi->reset_gpio = NULL;
  

• } else {

• gpiod_direction_output(jdi->reset_gpio, 0);
  

• }
• jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
• if (IS_ERR(jdi->enable_gpio)) {

• dev_err(dev, "cannot get enable-gpio %ld\n",
  

• 	PTR_ERR(jdi->enable_gpio));
  

• jdi->enable_gpio = NULL;
  

• } else {

• gpiod_direction_output(jdi->enable_gpio, 0);
  

• }
• jdi->pwm_gpio = devm_gpiod_get(dev, "pwm", GPIOD_OUT_LOW);
• if (IS_ERR(jdi->pwm_gpio)) {

• dev_err(dev, "cannot get pwm-gpio %ld\n",
  

• 	PTR_ERR(jdi->pwm_gpio));
  

• jdi->pwm_gpio = NULL;
  

• } else {

• gpiod_direction_output(jdi->pwm_gpio, 0);
  

• }
• /* we don't have backlight right now, proceed further */

+#ifdef BACKLIGHT

• np = of_parse_phandle(dev->of_node, "backlight", 0);
• if (np) {

• jdi->backlight = of_find_backlight_by_node(np);
  

• of_node_put(np);
  

• if (!jdi->backlight)
  

• 	return -EPROBE_DEFER;
  

• }

+#endif

• drm_panel_init(&jdi->base);
• jdi->base.funcs = &jdi_panel_funcs;
• jdi->base.dev = &jdi->dsi->dev;
• ret = drm_panel_add(&jdi->base);
• if (ret < 0)

• goto put_backlight;
  

• return 0;

+put_backlight:

• if (jdi->backlight)

• put_device(&jdi->backlight->dev);
  

• return ret;

+}

+static void jdi_panel_del(struct jdi_panel *jdi) +{

• if (jdi->base.dev)

• drm_panel_remove(&jdi->base);
  

• if (jdi->backlight)

• put_device(&jdi->backlight->dev);
  

+}

+static int jdi_panel_probe(struct mipi_dsi_device *dsi) +{

• struct jdi_panel *jdi;
• int ret;
• dsi->lanes = 4;
• dsi->format = MIPI_DSI_FMT_RGB888;
• dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |

• 	MIPI_DSI_MODE_VIDEO_HFP | MIPI_DSI_MODE_VIDEO_HBP |
  

• 	MIPI_DSI_MODE_VIDEO_HSA |
  

• 	MIPI_DSI_CLOCK_NON_CONTINUOUS;
  

• jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
• if (!jdi)

• return -ENOMEM;
  

• mipi_dsi_set_drvdata(dsi, jdi);
• jdi->dsi = dsi;
• ret = jdi_panel_add(jdi);
• if (ret < 0)

• return ret;
  

• return mipi_dsi_attach(dsi);

+}

+static int jdi_panel_remove(struct mipi_dsi_device *dsi) +{

• struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
• int ret;
• ret = jdi_panel_disable(&jdi->base);
• if (ret < 0)

• dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
  

• ret = mipi_dsi_detach(dsi);
• if (ret < 0)

• dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
  

• 	ret);
  

• drm_panel_detach(&jdi->base);
• jdi_panel_del(jdi);
• return 0;

+}

+static void jdi_panel_shutdown(struct mipi_dsi_device *dsi) +{

• struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
• jdi_panel_disable(&jdi->base);

+}

+static struct mipi_dsi_driver jdi_panel_driver = {

• .driver = {

• .name = "panel-jdi-lt070me05000",
  

• .of_match_table = jdi_of_match,
  

• },
• .probe = jdi_panel_probe,
• .remove = jdi_panel_remove,
• .shutdown = jdi_panel_shutdown,

+}; +module_mipi_dsi_driver(jdi_panel_driver);

+MODULE_AUTHOR("Sumit Semwal sumit.semwal@linaro.org"); +MODULE_AUTHOR("Vinay Simha BN simhavcs@gmail.com"); +MODULE_DESCRIPTION("JDI WUXGA LT070ME05000 DSI video/command mode panel driver");

+MODULE_LICENSE("GPL v2");

2.1.2