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Date: Sat, 14 Mar 2020 16:02:35 +0800
From: Icenowy Zheng <icenowy@...c.io>
To: Sam Ravnborg <sam@...nborg.org>
CC: Thierry Reding <thierry.reding@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Maxime Ripard <mripard@...nel.org>,
Chen-Yu Tsai <wens@...e.org>,
Ondrej Jirman <megous@...ous.com>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-sunxi@...glegroups.com
Subject: Re: [PATCH 3/5] drm: panel: add Xingbangda XBD599 panel
于 2020年3月14日 GMT+08:00 下午4:00:00, Sam Ravnborg <sam@...nborg.org> 写到:
>Hi Icenowy
>
>A few details in the following.
>
> Sam
>
>On Thu, Mar 12, 2020 at 12:33:27AM +0800, Icenowy Zheng wrote:
>> Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI IPS LCD panel made by
>> Xingbangda, which is used on PinePhone final assembled phones.
>>
>> Add support for it.
>>
>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>> ---
>> drivers/gpu/drm/panel/Kconfig | 9 +
>> drivers/gpu/drm/panel/Makefile | 1 +
>> .../gpu/drm/panel/panel-xingbangda-xbd599.c | 367
>++++++++++++++++++
>> 3 files changed, 377 insertions(+)
>> create mode 100644 drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
>>
>> +++ b/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
>> @@ -0,0 +1,367 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Xingbangda XBD599 MIPI-DSI panel driver
>> + *
>> + * Copyright (C) 2019 Icenowy Zheng <icenowy@...c.io>
>2020?
The work started at Mid 2019.
Is 2019-2020 okay?
>
>> + *
>> + * Based on panel-rocktech-jh057n00900.c, which is:
>> + * Copyright (C) Purism SPC 2019
>> + */
>> +
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/delay.h>
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/regulator/consumer.h>
>Sort alphabetically.
>
>> +
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_modes.h>
>> +#include <drm/drm_panel.h>
>> +#include <drm/drm_print.h>
>> +
>> +#define DRV_NAME "panel-xingbangda-xbd599"
>No reason for this indirection, it is only used once
>
>> +
>> +/* Manufacturer specific Commands send via DSI */
>> +#define ST7703_CMD_ALL_PIXEL_OFF 0x22
>> +#define ST7703_CMD_ALL_PIXEL_ON 0x23
>> +#define ST7703_CMD_SETDISP 0xB2
>> +#define ST7703_CMD_SETRGBIF 0xB3
>> +#define ST7703_CMD_SETCYC 0xB4
>> +#define ST7703_CMD_SETBGP 0xB5
>> +#define ST7703_CMD_SETVCOM 0xB6
>> +#define ST7703_CMD_SETOTP 0xB7
>> +#define ST7703_CMD_SETPOWER_EXT 0xB8
>> +#define ST7703_CMD_SETEXTC 0xB9
>> +#define ST7703_CMD_SETMIPI 0xBA
>> +#define ST7703_CMD_SETVDC 0xBC
>> +#define ST7703_CMD_SETSCR 0xC0
>> +#define ST7703_CMD_SETPOWER 0xC1
>> +#define ST7703_CMD_UNK_C6 0xC6
>> +#define ST7703_CMD_SETPANEL 0xCC
>> +#define ST7703_CMD_SETGAMMA 0xE0
>> +#define ST7703_CMD_SETEQ 0xE3
>> +#define ST7703_CMD_SETGIP1 0xE9
>> +#define ST7703_CMD_SETGIP2 0xEA
>> +
>> +static const char * const regulator_names[] = {
>> + "iovcc",
>> + "vcc",
>> +};
>> +
>> +struct xbd599 {
>> + struct device *dev;
>> + struct drm_panel panel;
>> + struct gpio_desc *reset_gpio;
>> + struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
>> + bool prepared;
>> +};
>> +
>> +static inline struct xbd599 *panel_to_xbd599(struct drm_panel
>*panel)
>> +{
>> + return container_of(panel, struct xbd599, panel);
>> +}
>> +
>> +#define dsi_dcs_write_seq(dsi, cmd, seq...) do { \
>> + static const u8 d[] = { seq }; \
>> + int ret; \
>> + ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d)); \
>> + if (ret < 0) \
>> + return ret; \
>> + } while (0)
>> +
>> +static int xbd599_init_sequence(struct xbd599 *ctx)
>> +{
>> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> + struct device *dev = ctx->dev;
>> + int ret;
>> +
>> + /*
>> + * Init sequence was supplied by the panel vendor.
>> + */
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETEXTC,
>> + 0xF1, 0x12, 0x83);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETMIPI,
>> + 0x33, 0x81, 0x05, 0xF9, 0x0E, 0x0E, 0x20, 0x00,
>> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x25,
>> + 0x00, 0x91, 0x0a, 0x00, 0x00, 0x02, 0x4F, 0x11,
>> + 0x00, 0x00, 0x37);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT,
>> + 0x25, 0x22, 0x20, 0x03);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF,
>> + 0x10, 0x10, 0x05, 0x05, 0x03, 0xFF, 0x00, 0x00,
>> + 0x00, 0x00);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR,
>> + 0x73, 0x73, 0x50, 0x50, 0x00, 0xC0, 0x08, 0x70,
>> + 0x00);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETDISP, 0xF0, 0x12, 0xF0);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETEQ,
>> + 0x00, 0x00, 0x0B, 0x0B, 0x10, 0x10, 0x00, 0x00,
>> + 0x00, 0x00, 0xFF, 0x00, 0xC0, 0x10);
>> + dsi_dcs_write_seq(dsi, 0xC6, 0x01, 0x00, 0xFF, 0xFF, 0x00);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER,
>> + 0x74, 0x00, 0x32, 0x32, 0x77, 0xF1, 0xFF, 0xFF,
>> + 0xCC, 0xCC, 0x77, 0x77);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP, 0x07, 0x07);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM, 0x2C, 0x2C);
>> + dsi_dcs_write_seq(dsi, 0xBF, 0x02, 0x11, 0x00);
>> +
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1,
>> + 0x82, 0x10, 0x06, 0x05, 0xA2, 0x0A, 0xA5, 0x12,
>> + 0x31, 0x23, 0x37, 0x83, 0x04, 0xBC, 0x27, 0x38,
>> + 0x0C, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0C, 0x00,
>> + 0x03, 0x00, 0x00, 0x00, 0x75, 0x75, 0x31, 0x88,
>> + 0x88, 0x88, 0x88, 0x88, 0x88, 0x13, 0x88, 0x64,
>> + 0x64, 0x20, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
>> + 0x02, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP2,
>> + 0x02, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> + 0x00, 0x00, 0x00, 0x00, 0x02, 0x46, 0x02, 0x88,
>> + 0x88, 0x88, 0x88, 0x88, 0x88, 0x64, 0x88, 0x13,
>> + 0x57, 0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
>> + 0x75, 0x88, 0x23, 0x14, 0x00, 0x00, 0x02, 0x00,
>> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> + 0x00, 0x00, 0x00 ,0x00, 0x00, 0x00, 0x03, 0x0A,
>> + 0xA5, 0x00, 0x00, 0x00, 0x00);
>> + dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA,
>> + 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41, 0x35,
>> + 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12, 0x12,
>> + 0x18, 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41,
>> + 0x35, 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12,
>> + 0x12, 0x18);
>> + msleep(20);
>> +
>> + ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>> + if (ret < 0) {
>> + DRM_DEV_ERROR(dev, "Failed to exit sleep mode\n");
>> + return ret;
>> + }
>> + msleep(250);
>> +
>> + ret = mipi_dsi_dcs_set_display_on(dsi);
>> + if (ret)
>> + return ret;
>> + msleep(50);
>> +
>> + DRM_DEV_DEBUG_DRIVER(dev, "Panel init sequence done\n");
>> + return 0;
>> +}
>> +
>> +static int xbd599_disable(struct drm_panel *panel)
>> +{
>> + struct xbd599 *ctx = panel_to_xbd599(panel);
>> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> +
>> + return mipi_dsi_dcs_set_display_off(dsi);
>> +}
>The following is the same for many panels but anyway.
>
>The init order for a display is
>
> prepare
> enable
>
> # Display is now fully operational
>
> disable
> unprepare
>
> # display is now off and turned off (no power)
>
>So when reading panel drivers my personal preference is to read the
>functions in that order - this makes it easier to follow the sequence.
>
>Thats just my personal opinion - so feel free to ignore.
>
>> +
>> +static int xbd599_unprepare(struct drm_panel *panel)
>> +{
>> + struct xbd599 *ctx = panel_to_xbd599(panel);
>> +
>> + if (!ctx->prepared)
>> + return 0;
>> +
>> + regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
>> + ctx->prepared = false;
>> +
>> + return 0;
>> +}
>Maybe activate reset before power is turned off.
>So when power is turned on again later the panel is kept in reset.
>
>This would also make this a closer mirror of what is done in prepare()
>
>> +
>> +static int xbd599_enable(struct drm_panel *panel)
>> +{
>> + struct xbd599 *ctx = panel_to_xbd599(panel);
>> + int ret;
>> +
>> + ret = xbd599_init_sequence(ctx);
>> + if (ret < 0) {
>> + DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n",
>> + ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int xbd599_prepare(struct drm_panel *panel)
>> +{
>> + struct xbd599 *ctx = panel_to_xbd599(panel);
>> + int ret;
>> +
>> + if (ctx->prepared)
>> + return 0;
>> +
>> + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
>ctx->supplies);
>> + if (ret)
>> + return ret;
>> +
>> + DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel\n");
>> + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> + usleep_range(20, 40);
>> + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> + msleep(20);
>> +
>> + ctx->prepared = true;
>> +
>> + return 0;
>> +}
>> +
>> +static const struct drm_display_mode xbd599_default_mode = {
>> + .hdisplay = 720,
>> + .hsync_start = 720 + 40,
>> + .hsync_end = 720 + 40 + 40,
>> + .htotal = 720 + 40 + 40 + 40,
>> + .vdisplay = 1440,
>> + .vsync_start = 1440 + 18,
>> + .vsync_end = 1440 + 18 + 10,
>> + .vtotal = 1440 + 18 + 10 + 17,
>> + .vrefresh = 60,
>> + .clock = 69000,
>> + .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>> +
>> + .width_mm = 68,
>> + .height_mm = 136,
>> + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
>> +};
>> +
>> +static int xbd599_get_modes(struct drm_panel *panel,
>> + struct drm_connector *connector)
>> +{
>> + struct xbd599 *ctx = panel_to_xbd599(panel);
>> + struct drm_display_mode *mode;
>> +
>> + mode = drm_mode_duplicate(connector->dev, &xbd599_default_mode);
>> + if (!mode) {
>> + DRM_DEV_ERROR(ctx->dev, "Failed to add mode\n");
>> + return -ENOMEM;
>> + }
>> +
>> + drm_mode_set_name(mode);
>> +
>> + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
>> + connector->display_info.width_mm = mode->width_mm;
>> + connector->display_info.height_mm = mode->height_mm;
>> + drm_mode_probed_add(connector, mode);
>> +
>> + return 1;
>> +}
>> +
>> +static const struct drm_panel_funcs xbd599_drm_funcs = {
>> + .disable = xbd599_disable,
>> + .unprepare = xbd599_unprepare,
>> + .enable = xbd599_enable,
>> + .prepare = xbd599_prepare,
>> + .get_modes = xbd599_get_modes,
>> +};
>> +
>> +static int xbd599_probe(struct mipi_dsi_device *dsi)
>> +{
>> + struct device *dev = &dsi->dev;
>> + struct xbd599 *ctx;
>> + int i, ret;
>> +
>> + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> + if (!ctx)
>> + return -ENOMEM;
>> +
>> + for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
>> + ctx->supplies[i].supply = regulator_names[i];
>> +
>> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
>> + ctx->supplies);
>> + if (ret < 0) {
>> + DRM_DEV_ERROR(&dsi->dev, "cannot get regulators\n");
>> + return ret;
>> + }
>> +
>> + ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
>> + if (IS_ERR(ctx->reset_gpio)) {
>> + DRM_DEV_ERROR(dev, "cannot get reset gpio\n");
>> + return PTR_ERR(ctx->reset_gpio);
>> + }
>> +
>> + mipi_dsi_set_drvdata(dsi, ctx);
>> +
>> + ctx->dev = dev;
>> +
>> + dsi->lanes = 4;
>> + dsi->format = MIPI_DSI_FMT_RGB888;
>> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
>MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
>> +
>> + drm_panel_init(&ctx->panel, &dsi->dev, &xbd599_drm_funcs,
>> + DRM_MODE_CONNECTOR_DSI);
>> +
>> + ret = drm_panel_of_backlight(&ctx->panel);
>> + if (ret)
>> + return ret;
>> +
>> + drm_panel_add(&ctx->panel);
>> +
>> + ret = mipi_dsi_attach(dsi);
>> + if (ret < 0) {
>> + DRM_DEV_ERROR(dev, "mipi_dsi_attach failed. Is host ready?\n");
>> + drm_panel_remove(&ctx->panel);
>> + return ret;
>> + }
>> +
>> + DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
>> + xbd599_default_mode.hdisplay,
>> + xbd599_default_mode.vdisplay,
>> + xbd599_default_mode.vrefresh,
>> + mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
>> +
>> + return 0;
>> +}
>> +
>> +static void xbd599_shutdown(struct mipi_dsi_device *dsi)
>> +{
>> + struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
>> + int ret;
>> +
>> + ret = xbd599_unprepare(&ctx->panel);
>
>Use drm_panel_unprepare().
>There may be, or may come functionality in drm_panel that is required.
>
>> + if (ret < 0)
>> + DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",
>> + ret);
>> +}
>> +
>> +static int xbd599_remove(struct mipi_dsi_device *dsi)
>> +{
>> + struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
>> + int ret;
>> +
>> + xbd599_shutdown(dsi);
>> +
>> + ret = mipi_dsi_detach(dsi);
>> + if (ret < 0)
>> + DRM_DEV_ERROR(&dsi->dev, "Failed to detach from DSI host: %d\n",
>> + ret);
>> +
>> + drm_panel_remove(&ctx->panel);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id xbd599_of_match[] = {
>> + { .compatible = "xingbangda,xbd599", },
>> + { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, xbd599_of_match);
>> +
>> +static struct mipi_dsi_driver xbd599_driver = {
>> + .probe = xbd599_probe,
>> + .remove = xbd599_remove,
>> + .shutdown = xbd599_shutdown,
>> + .driver = {
>> + .name = DRV_NAME,
>> + .of_match_table = xbd599_of_match,
>> + },
>> +};
>> +module_mipi_dsi_driver(xbd599_driver);
>> +
>> +MODULE_AUTHOR("Icenowy Zheng <icenowy@...c.io>");
>> +MODULE_DESCRIPTION("DRM driver for Xingbangda XBD599 MIPI DSI
>panel");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 2.24.1
--
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