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Date:   Sun, 9 Jun 2019 13:51:05 +0200
From:   Sam Ravnborg <sam@ravnborg.org>
To:     Jitao Shi <jitao.shi@mediatek.com>
Cc:     Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        linux-pwm@vger.kernel.org, David Airlie <airlied@linux.ie>,
        Matthias Brugger <matthias.bgg@gmail.com>, stonea168@163.com,
        dri-devel@lists.freedesktop.org,
        Andy Yan <andy.yan@rock-chips.com>,
        Ajay Kumar <ajaykumar.rs@samsung.com>,
        Vincent Palatin <vpalatin@chromium.org>,
        cawa.cheng@mediatek.com,
        Russell King <rmk+kernel@arm.linux.org.uk>,
        Thierry Reding <treding@nvidia.com>,
        devicetree@vger.kernel.org, linux-mediatek@lists.infradead.org,
        yingjoe.chen@mediatek.com, eddie.huang@mediatek.com,
        linux-arm-kernel@lists.infradead.org,
        Rahul Sharma <rahul.sharma@samsung.com>,
        srv_heupstream@mediatek.com, linux-kernel@vger.kernel.org,
        Sascha Hauer <kernel@pengutronix.de>,
        Sean Paul <seanpaul@chromium.org>
Subject: Re: [2/2] drm/panel: support for AUO kd101n80-45na wuxga dsi video
 mode panel
Message-ID: <20190609115105.GA31079@ravnborg.org>
References: <20190608112342.64416-1-jitao.shi@mediatek.com>
 <20190608112342.64416-2-jitao.shi@mediatek.com>
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In-Reply-To: <20190608112342.64416-2-jitao.shi@mediatek.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Jitao.

Thanks for another panel driver.

The comments for the panel-boe-tv101wum-nl6 diver to extent
applies to this driver too.
Please address these and I will do a proper review of the next version.

I notice that error handlign is a little bit less in this driver.
consier what approch to use and see if you can align between these
drivers, and if in doubt use panel-simple as your role model.

	Sam

On Sat, Jun 08, 2019 at 07:23:42PM +0800, Jitao Shi wrote:
> Add driver for AUO kd101n80-45na panel.
> This panel supports the resolution 1200x1920, dsi video mode
> and 4 lanes.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |  10 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  .../gpu/drm/panel/panel-auo-kd101n80-45na.c   | 352 ++++++++++++++++++
>  3 files changed, 363 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-auo-kd101n80-45na.c
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index e36dbb4df867..f5cd5af9ce42 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -272,4 +272,14 @@ config DRM_PANEL_TRULY_NT35597_WQXGA
>  	help
>  	  Say Y here if you want to enable support for Truly NT35597 WQXGA Dual DSI
>  	  Video Mode panel
> +
> +config DRM_PANEL_AUO_KD101N80_45NA
> +	tristate "AUO KD101N80_45NA 1200x1920 panel"
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	help
> +	  Say Y here if you want to support for AUO KD101N80_45NA WUXGA PANEL
> +	  DSI Video Mode panel
> +
>  endmenu
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 78e3dc376bdd..1056933bdf2e 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -28,3 +28,4 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
>  obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
>  obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
>  obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
> +obj-$(CONFIG_DRM_PANEL_AUO_KD101N80_45NA) += panel-auo-kd101n80-45na.o
> diff --git a/drivers/gpu/drm/panel/panel-auo-kd101n80-45na.c b/drivers/gpu/drm/panel/panel-auo-kd101n80-45na.c
> new file mode 100644
> index 000000000000..ab7bfc059e8a
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-auo-kd101n80-45na.c
> @@ -0,0 +1,352 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018 MediaTek Inc.
> + * Author: Jitao Shi <jitao.shi@mediatek.com>
> + */
> +
> +#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>
> +
> +struct auo_panel {
> +	struct drm_panel base;
> +	struct mipi_dsi_device *dsi;
> +
> +	struct backlight_device *backlight;
> +	struct regulator *pp1800;
> +	struct regulator *avee;
> +	struct regulator *avdd;
> +	struct gpio_desc *enable_gpio;
> +
> +	bool prepared;
> +	bool enabled;
> +
> +	const struct drm_display_mode *mode;
> +};
> +
> +static inline struct auo_panel *to_auo_panel(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct auo_panel, base);
> +}
> +
> +static int auo_panel_init(struct auo_panel *auo)
> +{
> +	struct drm_panel *panel = &auo->base;
> +	int err;
> +
> +	err = mipi_dsi_dcs_exit_sleep_mode(auo->dsi);
> +	if (err < 0) {
> +		DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
> +			      err);
> +		return err;
> +	}
> +
> +	/* T3.1*/
> +	msleep(120);
> +
> +	err = mipi_dsi_dcs_set_display_on(auo->dsi);
> +	if (err < 0) {
> +		DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
> +			      err);
> +	}
> +	/* T3.1 + T3.2: > 200ms */
> +	msleep(120);
> +
> +	return err;
> +}
> +
> +static int auo_panel_off(struct auo_panel *auo)
> +{
> +	struct mipi_dsi_device *dsi = auo->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;
> +
> +	return 0;
> +}
> +
> +static int auo_panel_disable(struct drm_panel *panel)
> +{
> +	struct auo_panel *auo = to_auo_panel(panel);
> +
> +	if (!auo->enabled)
> +		return 0;
> +
> +	backlight_disable(auo->backlight);
> +
> +	auo->enabled = false;
> +
> +	return 0;
> +}
> +
> +static int auo_panel_unprepare(struct drm_panel *panel)
> +{
> +	struct auo_panel *auo = to_auo_panel(panel);
> +	int ret;
> +
> +	if (!auo->prepared)
> +		return 0;
> +
> +	ret = auo_panel_off(auo);
> +	if (ret < 0) {
> +		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
> +		return ret;
> +	}
> +
> +	msleep(150);
> +	regulator_disable(auo->avee);
> +	regulator_disable(auo->avdd);
> +	usleep_range(5000, 7000);
> +	regulator_disable(auo->pp1800);
> +	if (auo->enable_gpio)
> +		gpiod_set_value(auo->enable_gpio, 0);
> +
> +	auo->prepared = false;
> +
> +	return 0;
> +}
> +
> +static int auo_panel_prepare(struct drm_panel *panel)
> +{
> +	struct auo_panel *auo = to_auo_panel(panel);
> +	int ret;
> +
> +	if (auo->prepared)
> +		return 0;
> +
> +	if (auo->enable_gpio) {
> +		gpiod_set_value(auo->enable_gpio, 0);
> +		usleep_range(1000, 1500);
> +	}
> +
> +	ret = regulator_enable(auo->pp1800);
> +	if (ret < 0)
> +		return ret;
> +	ret = regulator_enable(auo->avdd);
> +	if (ret < 0)
> +		goto poweroff1v8;
> +	ret = regulator_enable(auo->avee);
> +	if (ret < 0)
> +		goto poweroffavdd;
> +
> +	if (auo->enable_gpio) {
> +		gpiod_set_value(auo->enable_gpio, 1);
> +		usleep_range(10000, 12000);
> +	}
> +
> +	ret = auo_panel_init(auo);
> +	if (ret < 0) {
> +		dev_err(panel->dev, "failed to init panel: %d\n", ret);
> +		goto poweroff;
> +	}
> +
> +	auo->prepared = true;
> +
> +	return 0;
> +
> +poweroff:
> +	regulator_disable(auo->avee);
> +poweroffavdd:
> +	regulator_disable(auo->avdd);
> +poweroff1v8:
> +	usleep_range(5000, 7000);
> +	regulator_disable(auo->pp1800);
> +	if (auo->enable_gpio)
> +		gpiod_set_value(auo->enable_gpio, 0);
> +	return ret;
> +}
> +
> +static int auo_panel_enable(struct drm_panel *panel)
> +{
> +	struct auo_panel *auo = to_auo_panel(panel);
> +	int ret;
> +
> +	if (auo->enabled)
> +		return 0;
> +
> +	ret = backlight_enable(auo->backlight);
> +	if (ret) {
> +		DRM_DEV_ERROR(panel->drm->dev,
> +			      "Failed to enable backlight %d\n", ret);
> +		return ret;
> +	}
> +
> +	auo->enabled = true;
> +
> +	return 0;
> +}
> +
> +static const struct drm_display_mode default_mode = {
> +	.clock = 157000,
> +	.hdisplay = 1200,
> +	.hsync_start = 1200 + 80,
> +	.hsync_end = 1200 + 80 + 24,
> +	.htotal = 1200 + 80 + 24 + 36,
> +	.vdisplay = 1920,
> +	.vsync_start = 1920 + 16,
> +	.vsync_end = 1920 + 16 + 4,
> +	.vtotal = 1920 + 16 + 4 + 16,
> +	.vrefresh = 60,
> +};
> +
> +static int auo_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);
> +
> +	panel->connector->display_info.width_mm = 135;
> +	panel->connector->display_info.height_mm = 216;
> +	panel->connector->display_info.bpc = 8;
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs auo_panel_funcs = {
> +	.disable = auo_panel_disable,
> +	.unprepare = auo_panel_unprepare,
> +	.prepare = auo_panel_prepare,
> +	.enable = auo_panel_enable,
> +	.get_modes = auo_panel_get_modes,
> +};
> +
> +static int auo_panel_add(struct auo_panel *auo)
> +{
> +	struct device *dev = &auo->dsi->dev;
> +
> +	auo->avdd = devm_regulator_get(dev, "avdd");
> +	if (IS_ERR(auo->avdd))
> +		return PTR_ERR(auo->avdd);
> +
> +	auo->avee = devm_regulator_get(dev, "avee");
> +	if (IS_ERR(auo->avee))
> +		return PTR_ERR(auo->avee);
> +
> +	auo->pp1800 = devm_regulator_get(dev, "pp1800");
> +	if (IS_ERR(auo->pp1800))
> +		return PTR_ERR(auo->pp1800);
> +
> +	auo->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
> +	if (IS_ERR(auo->enable_gpio)) {
> +		dev_err(dev, "cannot get reset-gpios %ld\n",
> +			PTR_ERR(auo->enable_gpio));
> +		auo->enable_gpio = NULL;
> +	} else {
> +		gpiod_set_value(auo->enable_gpio, 0);
> +	}
> +
> +	auo->backlight = devm_of_find_backlight(dev);
> +	if (IS_ERR(auo->backlight))
> +		return PTR_ERR(auo->backlight);
> +
> +	drm_panel_init(&auo->base);
> +	auo->base.funcs = &auo_panel_funcs;
> +	auo->base.dev = &auo->dsi->dev;
> +
> +	return drm_panel_add(&auo->base);
> +}
> +
> +static void auo_panel_del(struct auo_panel *auo)
> +{
> +	if (auo->base.dev)
> +		drm_panel_remove(&auo->base);
> +}
> +
> +static int auo_panel_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct auo_panel *auo;
> +	int ret;
> +
> +	dsi->lanes = 4;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
> +		 MIPI_DSI_MODE_LPM;
> +
> +	auo = devm_kzalloc(&dsi->dev, sizeof(*auo), GFP_KERNEL);
> +	if (!auo)
> +		return -ENOMEM;
> +
> +	mipi_dsi_set_drvdata(dsi, auo);
> +
> +	auo->dsi = dsi;
> +
> +	ret = auo_panel_add(auo);
> +	if (ret < 0)
> +		return ret;
> +
> +	return mipi_dsi_attach(dsi);
> +}
> +
> +static int auo_panel_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct auo_panel *auo = mipi_dsi_get_drvdata(dsi);
> +	int ret;
> +
> +	ret = auo_panel_disable(&auo->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);
> +
> +	auo_panel_del(auo);
> +
> +	return 0;
> +}
> +
> +static void auo_panel_shutdown(struct mipi_dsi_device *dsi)
> +{
> +	struct auo_panel *auo = mipi_dsi_get_drvdata(dsi);
> +
> +	auo_panel_disable(&auo->base);
> +}
> +
> +static const struct of_device_id auo_of_match[] = {
> +	{ .compatible = "auo,kd101n80-45na", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, auo_of_match);
> +
> +static struct mipi_dsi_driver auo_panel_driver = {
> +	.driver = {
> +		.name = "panel-auo-kd101n80-45na",
> +		.of_match_table = auo_of_match,
> +	},
> +	.probe = auo_panel_probe,
> +	.remove = auo_panel_remove,
> +	.shutdown = auo_panel_shutdown,
> +};
> +module_mipi_dsi_driver(auo_panel_driver);
> +
> +MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
> +MODULE_DESCRIPTION("AUO kd101n80-45na wuxga (1200x1920) video mode panel driver");
> +MODULE_LICENSE("GPL v2");
> +
> -- 
> 2.21.0
> 
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