On Thu, Apr 14, 2016 at 8:10 PM, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote: > > > On 4/13/2016 11:58 AM, 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@xxxxxxxxx> >> >> Signed-off-by: Vinay Simha BN <simhavcs@xxxxxxxxx> >> [sumit.semwal: Ported to the drm/panel framework] >> Signed-off-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx> >> [jstultz: Cherry-picked to mainline, folded down other fixes >> from Vinay and Archit] >> Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx> >> --- >> .../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. >> + >> +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 >> +- 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@xxxxxxxxx> >> + * >> + * Copyright (C) 2015 Linaro Ltd >> + * Author: Sumit Semwal <sumit.semwal@xxxxxxxxxx> >> + * >> + * 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}; > > > Apart from the u8 conversion as mentioned by Thierry, you should > convert these to const too. > > >> + >> +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; > > > Any reason why these are overwritten? It would be better to have these > values in the array itself. > > >> + >> + 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; >> +} > > > The prepare/enable split seems a bit strange. Don't we want to put > mipi_dsi_dcs_set_display_on in the enable() op too? enable will be called after the prepare(). enable() - usually the backlight update status BLANK/UNBLANK is done > >> + >> +static const struct drm_display_mode default_mode = { >> + .clock = 155000, > > > htotal * vtotal * vrefresh (1934 * 1340 * 60.32(as in comment)) comes > at around 156.3 Mhz. Could you plug in the correct frequency? > >> + .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); > > > We should use the dsi->dev device pointer here like used elsewhere, not > the drm device pointer. > > >> + 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); > > > You could consider using regulator_get_bulk() api here, it would clean > up the code a bit. > > >> + >> + /* 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); > > > Ideally, the driver's remove op shouldn't try to disable the panel. It > should be done by the dsi host's connector itself. We can drop this > unless there is a specfic reason to do so. > panel_disable() - sets the backlight brightness off fyi, include/drm/drm_panel.h Before stopping video transmission from the display controller it can be necessary to turn off the panel to avoid visual glitches. This is done in the .disable() function. > Thanks for working on this. > > Archit > > -- > Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, > a Linux Foundation Collaborative Project -- Regards, Vinay Simha.B.N. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
