Message-ID: <CAGWqDJ69niD4S4rWnqjp+jvuWDf8X1HG2phJHzhdHPMjeNqJBg@mail.gmail.com>
Date:	Tue, 28 Jun 2016 21:29:39 +0530
From:	Vinay Simha <simhavcs@...il.com>
To:	Vinay Simha BN <simhavcs@...il.com>
Cc:	Archit Taneja <archit.taneja@...il.com>,
	Rob Clark <robdclark@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	John Stultz <john.stultz@...aro.org>,
	Emil Velikov <emil.l.velikov@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	David Airlie <airlied@...ux.ie>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v7 2/2] drm/panel: Add JDI LT070ME05000 WUXGA DSI Panel

hi,

Any further comments or reviews?

On Mon, Jun 20, 2016 at 11:23 AM, Vinay Simha BN <simhavcs@...il.com> 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
>
> Cc: Archit Taneja <archit.taneja@...il.com>
> Cc: Rob Clark <robdclark@...il.com>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Emil Velikov <emil.l.velikov@...il.com>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: David Airlie <airlied@...ux.ie>
> Signed-off-by: Sumit Semwal <sumit.semwal@...aro.org>
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> Signed-off-by: Vinay Simha BN <simhavcs@...il.com>
>
> ---
> v1:
>  * sumit ported to drm/panel framework, john cherry-picked to mainline,
>    folded down other fixes from Vinay and Archit, vinay removed interface
>    setting cmd mode, video mode panel selected
>
> v2:
>  * incorporated code reviews from theiry, archit
>    code style, alphabetical soring in Makefile, Kconfig, regulator_bulk,
>    arrays of u8, generic helper function, documentation bindings,
>
> v3:
>  * dcs backlight support added
>  * tested this panel driver in nexus7 2013 device
>
> v4:
>  * backlight interface added in the panel driver
>  * incorporated width_mm and height_mm suggested by rob herring
>
> v5:
>  * theirry review comments incorporated
>    panel model naming consistent, alphabetical soring in Kconfig
>    Makefile, MAX_BRIGHTNESS dropped, regulator_names, parameterize
>    panel width and height, descprition for control display, cabc
>    and interface setting, temporary variable removed, consistent
>    error reporting and commit message
>  * removed tear on/off, scanline, since these are required only
>    for command mode panels
>
> v6:
>  * emil review comments incorporated
>    PANEL_NUM_REGULATORS dropped, return ret added at necessary
>    places, if checks dropped for backlight and gpios
>
> v7:
>  * emil review comments incorporated
>    added ARRAY_SIZE in struct, regulator_bulk_disable in poweroff,
>    gpios checks dropped.
>    some returns cannot be dropped, since drm panel framework return
>    type required.
> ---
>  drivers/gpu/drm/panel/Kconfig                  |  11 +
>  drivers/gpu/drm/panel/Makefile                 |   1 +
>  drivers/gpu/drm/panel/panel-jdi-lt070me05000.c | 495 +++++++++++++++++++++++++
>  3 files changed, 507 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 1500ab9..62aba97 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -18,6 +18,17 @@ config DRM_PANEL_SIMPLE
>           that it can be automatically turned off when the panel goes into a
>           low power state.
>
> +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 DSI video mode
> +         panel as found in Google Nexus 7 (2013) devices.
> +         The panel has a 1200(RGB)×1920 (WUXGA) resolution and uses
> +         24 bit per pixel.
> +
>  config DRM_PANEL_SAMSUNG_LD9040
>         tristate "Samsung LD9040 RGB/SPI panel"
>         depends on OF && SPI
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index f277eed..a5c7ec0 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_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
>  obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
>  obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.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..888fe2b
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
> @@ -0,0 +1,495 @@
> +/*
> + * Copyright (C) 2016 InforceComputing
> + * Author: Vinay Simha BN <simhavcs@...il.com>
> + *
> + * Copyright (C) 2016 Linaro Ltd
> + * Author: Sumit Semwal <sumit.semwal@...aro.org>
> + *
> + * 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
> + *
> + * 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>
> +
> +static const char * const regulator_names[] = {
> +       "vddp",
> +       "dcdc_en",
> +       "vcc"
> +};
> +
> +struct jdi_panel {
> +       struct drm_panel base;
> +       struct mipi_dsi_device *dsi;
> +
> +       struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> +
> +       struct gpio_desc *reset_gpio;
> +       struct gpio_desc *enable_gpio;
> +       struct backlight_device *backlight;
> +
> +       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 int jdi_panel_init(struct jdi_panel *jdi)
> +{
> +       struct mipi_dsi_device *dsi = jdi->dsi;
> +       int ret;
> +
> +       dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +       ret = mipi_dsi_dcs_soft_reset(dsi);
> +       if (ret < 0)
> +               return ret;
> +
> +       usleep_range(10000, 20000);
> +
> +       ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
> +       if (ret < 0)
> +               return ret;
> +
> +       ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
> +       if (ret < 0)
> +               return ret;
> +
> +       ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
> +       if (ret < 0)
> +               return ret;
> +
> +       /*
> +        * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
> +        *                  are active
> +        * BIT(3) BL = 1    Backlight Control On
> +        * BIT(2) DD = 0    Display Dimming is Off
> +        */
> +       ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
> +                                (u8[]){ 0x24 }, 1);
> +       if (ret < 0)
> +               return ret;
> +
> +       /* CABC off */
> +       ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
> +                                (u8[]){ 0x00 }, 1);
> +       if (ret < 0)
> +               return ret;
> +
> +       ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> +       if (ret < 0)
> +               return ret;
> +
> +       msleep(120);
> +
> +       ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
> +       if (ret < 0)
> +               return ret;
> +
> +       mdelay(10);
> +
> +       /* Interface setting, video mode */
> +       ret = mipi_dsi_generic_write(dsi, (u8[])
> +                                    {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
> +       if (ret < 0)
> +               return ret;
> +
> +       mdelay(20);
> +
> +       ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
> +
> +       return ret;
> +}
> +
> +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);
> +
> +       return ret;
> +}
> +
> +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);
> +
> +       msleep(100);
> +
> +       return ret;
> +}
> +
> +static int jdi_panel_disable(struct drm_panel *panel)
> +{
> +       struct jdi_panel *jdi = to_jdi_panel(panel);
> +
> +       if (!jdi->enabled)
> +               return 0;
> +
> +       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);
> +       struct device *dev = &jdi->dsi->dev;
> +       int ret;
> +
> +       if (!jdi->prepared)
> +               return 0;
> +
> +       ret = jdi_panel_off(jdi);
> +       if (ret) {
> +               dev_err(panel->dev, "failed to set panel off: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
> +       if (ret < 0)
> +               dev_err(dev, "regulator disable failed, %d\n", ret);
> +
> +       gpiod_set_value(jdi->enable_gpio, 0);
> +
> +       gpiod_set_value(jdi->reset_gpio, 0);
> +
> +       jdi->prepared = false;
> +
> +       return ret;
> +}
> +
> +static int jdi_panel_prepare(struct drm_panel *panel)
> +{
> +       struct jdi_panel *jdi = to_jdi_panel(panel);
> +       struct device *dev = &jdi->dsi->dev;
> +       int ret;
> +
> +       if (jdi->prepared)
> +               return 0;
> +
> +       ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
> +       if (ret < 0) {
> +               dev_err(dev, "regulator enable failed, %d\n", ret);
> +               return ret;
> +       }
> +
> +       msleep(20);
> +
> +       gpiod_set_value(jdi->reset_gpio, 1);
> +       usleep_range(10, 20);
> +
> +       gpiod_set_value(jdi->enable_gpio, 1);
> +       usleep_range(10, 20);
> +
> +       ret = jdi_panel_init(jdi);
> +       if (ret < 0) {
> +               dev_err(panel->dev, "failed to init panel: %d\n", ret);
> +               goto poweroff;
> +       }
> +
> +       ret = jdi_panel_on(jdi);
> +       if (ret < 0) {
> +               dev_err(panel->dev, "failed to set panel on: %d\n", ret);
> +               goto poweroff;
> +       }
> +
> +       jdi->prepared = true;
> +
> +       return 0;
> +
> +poweroff:
> +       ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
> +       if (ret < 0)
> +               dev_err(dev, "regulator disable failed, %d\n", ret);
> +
> +       gpiod_set_value(jdi->enable_gpio, 0);
> +
> +       gpiod_set_value(jdi->reset_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;
> +
> +       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 = 155493,
> +               .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;
> +       struct jdi_panel *jdi = to_jdi_panel(panel);
> +       struct device *dev = &jdi->dsi->dev;
> +
> +       mode = drm_mode_duplicate(panel->drm, &default_mode);
> +       if (!mode) {
> +               dev_err(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);
> +
> +       panel->connector->display_info.width_mm = 95;
> +       panel->connector->display_info.height_mm = 151;
> +
> +       return 1;
> +}
> +
> +static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
> +{
> +       struct mipi_dsi_device *dsi = bl_get_data(bl);
> +       int ret;
> +       u16 brightness = bl->props.brightness;
> +
> +       dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +       ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
> +       if (ret < 0)
> +               return ret;
> +
> +       dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +       return brightness & 0xff;
> +}
> +
> +static int dsi_dcs_bl_update_status(struct backlight_device *bl)
> +{
> +       struct mipi_dsi_device *dsi = bl_get_data(bl);
> +       int ret;
> +
> +       dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +       ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
> +       if (ret < 0)
> +               return ret;
> +
> +       dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +       return 0;
> +}
> +
> +static const struct backlight_ops dsi_bl_ops = {
> +       .update_status = dsi_dcs_bl_update_status,
> +       .get_brightness = dsi_dcs_bl_get_brightness,
> +};
> +
> +struct backlight_device *
> +drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
> +{
> +       struct device *dev = &dsi->dev;
> +       struct backlight_properties props;
> +
> +       memset(&props, 0, sizeof(props));
> +       props.type = BACKLIGHT_RAW;
> +       props.brightness = 255;
> +       props.max_brightness = 255;
> +
> +       return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
> +                                             &dsi_bl_ops, &props);
> +}
> +
> +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;
> +       unsigned int i;
> +
> +       jdi->mode = &default_mode;
> +
> +       for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
> +               jdi->supplies[i].supply = regulator_names[i];
> +
> +       ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
> +                                     jdi->supplies);
> +       if (ret < 0) {
> +               dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> +               return ret;
> +       }
> +
> +       jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +       if (IS_ERR(jdi->reset_gpio)) {
> +               ret = PTR_ERR(jdi->reset_gpio);
> +               dev_err(dev, "cannot get reset-gpios %d\n", ret);
> +               return ret;
> +       }
> +
> +       jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
> +       if (IS_ERR(jdi->enable_gpio)) {
> +               ret = PTR_ERR(jdi->enable_gpio);
> +               dev_err(dev, "cannot get enable-gpio %d\n", ret);
> +               return ret;
> +       }
> +
> +       jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
> +       if (IS_ERR(jdi->backlight)) {
> +               ret = PTR_ERR(jdi->backlight);
> +               dev_err(dev, "failed to register backlight %d\n", ret);
> +               return ret;
> +       }
> +
> +       drm_panel_init(&jdi->base);
> +       jdi->base.funcs = &jdi_panel_funcs;
> +       jdi->base.dev = &jdi->dsi->dev;
> +
> +       ret = drm_panel_add(&jdi->base);
> +
> +       return ret;
> +}
> +
> +static void jdi_panel_del(struct jdi_panel *jdi)
> +{
> +       if (jdi->base.dev)
> +               drm_panel_remove(&jdi->base);
> +}
> +
> +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_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@...aro.org>");
> +MODULE_AUTHOR("Vinay Simha BN <simhavcs@...il.com>");
> +MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
> +MODULE_LICENSE("GPL v2");
> --
> 2.1.2
>



-- 
Regards,

Vinay Simha.B.N.

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