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SubjectRe: [PATCH v1 2/2] drm/panel: add support for rm69299 visionox panel driver
Hi Harigovindan.

Thanks for re-submitting this driver.
There is several more or less trivial comments below.
Please fix and send a v3.

Thanks,

Sam

On Fri, Nov 29, 2019 at 12:25:45PM +0530, Harigovindan P wrote:
> Add support for Visionox panel driver.
>
> Changes in v1:
> -Split out panel driver patch from dsi config changes(Rob Clark).
> -Remove unrelated code(Stephen Boyd).
> -Remove static arrays to make regulator setup open coded
> in probe(Stephen Boyd).
> -Remove pre-assigning variables(Stephen Boyd).
> -Inline panel_add function into probe(Stephen Boyd).
> -Use mipi_dsi_dcs_write directly(Rob Clark).
> -Remove qcom_rm69299_1080p_panel_magic_cmds array(Rob Clark).
>
> Signed-off-by: Harigovindan P <harigovi@codeaurora.org>
> ---
> drivers/gpu/drm/panel/Kconfig | 9 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-visionox-rm69299.c | 412 +++++++++++++++++++++++++
> 3 files changed, 422 insertions(+)
> create mode 100755 drivers/gpu/drm/panel/panel-visionox-rm69299.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index f152bc4..c06c403 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -355,4 +355,13 @@ 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_VISIONOX_RM69299
> + tristate "Visionox RM69299"
> + depends on OF
> + depends on DRM_MIPI_DSI
> + help
> + Say Y here if you want to enable support for Visionox
> + RM69299 DSI Video Mode panel.
Drop redundant space.

> +
> endmenu
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index b6cd39f..6f1e4c6 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -38,3 +38,4 @@ obj-$(CONFIG_DRM_PANEL_TPO_TD028TTEC1) += panel-tpo-td028ttec1.o
> obj-$(CONFIG_DRM_PANEL_TPO_TD043MTEA1) += panel-tpo-td043mtea1.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_VISIONOX_RM69299) += panel-visionox-rm69299.o
> diff --git a/drivers/gpu/drm/panel/panel-visionox-rm69299.c b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
> new file mode 100755
> index 0000000..da86714
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
> @@ -0,0 +1,412 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <drm/drm_panel.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_print.h>
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/of_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/backlight.h>
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +
> +#include <video/mipi_display.h>

Please use following structure for include files:
#include <linux/*>

#include <video/*>

#include <drm/*>

#include ""

And within each block sort the include lines alphabetically.

> +
> +struct rm69299_config {
> + unsigned long width_mm;
> + unsigned long height_mm;
> + const char *panel_name;
> + u32 num_on_cmds;
> + const struct drm_display_mode *dm;
> +};
> +
> +struct visionox_rm69299 {
> + struct device *dev;
> + struct drm_panel panel;
> +
> + struct regulator_bulk_data supplies[2];
> +
> + struct gpio_desc *reset_gpio;
> +
> + struct backlight_device *backlight;
backlight is never assigned - drop it.
Your binding does not mention backligth so
this seems to be correct to drop it.

> +
> + struct mipi_dsi_device *dsi;
> + const struct rm69299_config *config;
> + bool prepared;
> + bool enabled;
> +};
> +
> +static inline struct visionox_rm69299 *panel_to_ctx(struct drm_panel *panel)
> +{
> + return container_of(panel, struct visionox_rm69299, panel);
> +}
> +
> +static int visionox_35597_power_on(struct visionox_rm69299 *ctx)
> +{
> + int ret;
> +
> + ret = regulator_set_load(ctx->supplies[0].consumer, 32000);
> + if (ret)
> + return ret;
> +
> + ret = regulator_set_load(ctx->supplies[1].consumer, 13200);
> + if (ret)
> + return ret;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * Reset sequence of visionox panel requires the panel to be
> + * out of reset for 10ms, followed by being held in reset
> + * for 10ms and then out again
> + */
> + gpiod_set_value(ctx->reset_gpio, 1);
> + usleep_range(10000, 20000);
> + gpiod_set_value(ctx->reset_gpio, 0);
> + usleep_range(10000, 20000);
> + gpiod_set_value(ctx->reset_gpio, 1);
> + usleep_range(10000, 20000);
> +
> + return 0;
> +}
> +
> +static int visionox_rm69299_power_off(struct visionox_rm69299 *ctx)
> +{
> + int ret;
> +
> + gpiod_set_value(ctx->reset_gpio, 0);
> +
> + ret = regulator_set_load(ctx->supplies[0].consumer, 80);
> +
> + if (ret) {
> + DRM_DEV_ERROR(ctx->dev,
> + "regulator_set_load failed %d\n", ret);
> + return ret;
> + }
> +
> + ret = regulator_set_load(ctx->supplies[1].consumer, 80);

It looks wrong that you have to change regulator_set_load()
just before the regulators are disabled.
> +
> + if (ret) {
> + DRM_DEV_ERROR(ctx->dev,
> + "regulator_set_load failed %d\n", ret);
> + return ret;
> + }
> +
> + ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> + if (ret) {
> + DRM_DEV_ERROR(ctx->dev,
> + "regulator_bulk_disable failed %d\n", ret);
> + }
> + return ret;
> +}
> +
> +static int visionox_rm69299_disable(struct drm_panel *panel)
> +{
> + struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> + int ret;
> +
> + if (!ctx->enabled)
> + return 0;
> +
> + ret = backlight_disable(ctx->backlight);
> + if (ret < 0)
> + DRM_DEV_ERROR(ctx->dev, "backlight disable failed %d\n",
> + ret);
> +
> + ctx->enabled = false;
> + return 0;
> +}
With backlight dropped this function is no logner needed.

> +
> +static int visionox_rm69299_unprepare(struct drm_panel *panel)
> +{
> + struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> + int ret;
> +
> + if (!ctx->prepared)
> + return 0;
> +
> + ctx->dsi->mode_flags = 0;
> +
> + ret = mipi_dsi_dcs_write(ctx->dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "set_display_off cmd failed ret = %d\n",
> + ret);
> + }
> +
> + /* 120ms delay required here as per DCS spec */
> + msleep(120);
> +
> + ret = mipi_dsi_dcs_write(ctx->dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "enter_sleep cmd failed ret = %d\n", ret);
> + }
> +
> + ret = visionox_rm69299_power_off(ctx);
> + if (ret < 0)
> + DRM_DEV_ERROR(ctx->dev, "power_off failed ret = %d\n", ret);
visionox_rm69299_power_off() already printed an error message. No need
for two errors messages.
> +
> + ctx->prepared = false;
> + return ret;
> +}
> +
> +static int visionox_rm69299_prepare(struct drm_panel *panel)
> +{
> + struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> + int ret;
> + const struct rm69299_config *config;
> +
> + if (ctx->prepared)
> + return 0;
> +
> + ret = visionox_35597_power_on(ctx);
> + if (ret < 0)
> + return ret;
> +
> + ctx->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> + config = ctx->config;
> +
> + ret = mipi_dsi_dcs_write_buffer(ctx->dsi, (u8[]){ 0xfe, 0x00 }, 2);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "cmd set tx 0 failed, ret = %d\n",
> + ret);
> + goto power_off;
> + }
> +
> + ret = mipi_dsi_dcs_write_buffer(ctx->dsi, (u8[]){ 0xc2, 0x08 }, 2);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "cmd set tx 1 failed, ret = %d\n",
> + ret);
> + goto power_off;
> + }
> +
> + ret = mipi_dsi_dcs_write_buffer(ctx->dsi, (u8[]){ 0x35, 0x00 }, 2);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "cmd set tx 2 failed, ret = %d\n",
> + ret);
> + goto power_off;
> + }
> +
> + ret = mipi_dsi_dcs_write_buffer(ctx->dsi, (u8[]){ 0x51, 0xff }, 2);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "cmd set tx 3 failed, ret = %d\n",
> + ret);
> + goto power_off;
> + }
> +
> + ret = mipi_dsi_dcs_write(ctx->dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "exit_sleep_mode cmd failed ret = %d\n",
> + ret);
> + goto power_off;
> + }
> +
> + /* Per DSI spec wait 120ms after sending exit sleep DCS command */
> + msleep(120);
> +
> + ret = mipi_dsi_dcs_write(ctx->dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
> + if (ret < 0) {
> + DRM_DEV_ERROR(ctx->dev,
> + "set_display_on cmd failed ret = %d\n", ret);
> + goto power_off;
> + }
> +
> + /* Per DSI spec wait 120ms after sending set_display_on DCS command */
> + msleep(120);
> +
> + ctx->prepared = true;
> +
> + return 0;
> +
> +power_off:
> + if (visionox_rm69299_power_off(ctx))
> + DRM_DEV_ERROR(ctx->dev, "power_off failed\n");
No need for two error messages. visionox_rm69299_power_off() alredy
printed an error message.

> + return ret;
> +}
> +
> +static int visionox_rm69299_enable(struct drm_panel *panel)
> +{
> + struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> + int ret;
> +
> + if (ctx->enabled)
> + return 0;
> +
> + ret = backlight_enable(ctx->backlight);
> + if (ret < 0)
> + DRM_DEV_ERROR(ctx->dev, "backlight enable failed %d\n",
> + ret);
> +
> + ctx->enabled = true;
> +
> + return 0;
> +}
With backlight dropped there is no need for this function.

> +
> +static int visionox_rm69299_get_modes(struct drm_panel *panel)
In drm-misc-next this function takes drm_connector as an argument.
Please update.

> +{
> + struct drm_connector *connector = panel->connector;
> + struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> + struct drm_display_mode *mode;
> + const struct rm69299_config *config;
> +
> + config = ctx->config;
> + mode = drm_mode_create(connector->dev);
> + if (!mode) {
> + DRM_DEV_ERROR(ctx->dev,
> + "failed to create a new display mode\n");
> + return 0;
> + }
> +
> + connector->display_info.width_mm = config->width_mm;
> + connector->display_info.height_mm = config->height_mm;
> + drm_mode_copy(mode, config->dm);
> + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> + drm_mode_probed_add(connector, mode);
> +
> + return 1;
> +}
> +
> +static const struct drm_panel_funcs visionox_rm69299_drm_funcs = {
> + .disable = visionox_rm69299_disable,
> + .unprepare = visionox_rm69299_unprepare,
> + .prepare = visionox_rm69299_prepare,
> + .enable = visionox_rm69299_enable,
> + .get_modes = visionox_rm69299_get_modes,
> +};
> +
> +static const struct drm_display_mode qcom_sc7180_mtp_1080p_mode = {
> + .name = "1080x2248",
> + .clock = 158695,
> + .hdisplay = 1080,
> + .hsync_start = 1080 + 26,
> + .hsync_end = 1080 + 26 + 2,
> + .htotal = 1080 + 26 + 2 + 36,
> + .vdisplay = 2248,
> + .vsync_start = 2248 + 56,
> + .vsync_end = 2248 + 56 + 4,
> + .vtotal = 2248 + 56 + 4 + 4,
> + .vrefresh = 60,
> + .flags = 0,
> +};
> +
> +static const struct rm69299_config rm69299_dir = {
> + .width_mm = 74,
> + .height_mm = 131,
> + .panel_name = "qcom_sc7180_mtp_1080p_panel",
> + .dm = &qcom_sc7180_mtp_1080p_mode,
> +};
> +
> +static int visionox_rm69299_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device *dev = &dsi->dev;
> + struct device *device;
> + struct visionox_rm69299 *ctx;
> + const struct rm69299_config *config;
> + int ret;
> +
> + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +
> + if (!ctx)
> + return -ENOMEM;
> +
> + ctx->config = device_get_match_data(dev);
> +
> + if (!ctx->config) {
> + dev_err(dev, "missing device configuration\n");
> + return -ENODEV;
> + }
> +
> + mipi_dsi_set_drvdata(dsi, ctx);
> +
> + ctx->dev = dev;
> + ctx->dsi = dsi;
> +
> + device = ctx->dev;
> +
> + config = ctx->config;
> + ctx->supplies[0].supply = "vdda";
> + ctx->supplies[1].supply = "vdd3p3";
> +
> + ret = devm_regulator_bulk_get(device, ARRAY_SIZE(ctx->supplies),
> + ctx->supplies);
> + if (ret < 0)
> + return ret;
> +
> + ctx->reset_gpio = devm_gpiod_get(device, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(ctx->reset_gpio)) {
> + DRM_DEV_ERROR(dev, "cannot get reset gpio %ld\n",
> + PTR_ERR(ctx->reset_gpio));
> + return PTR_ERR(ctx->reset_gpio);
> + }
> +
> + drm_panel_init(&ctx->panel);
> + ctx->panel.dev = device;
> + ctx->panel.funcs = &visionox_rm69299_drm_funcs;
> + drm_panel_add(&ctx->panel);
> +
> + dsi->lanes = 4;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM |
> + MIPI_DSI_CLOCK_NON_CONTINUOUS;
> + ret = mipi_dsi_attach(dsi);
> + if (ret < 0) {
> + DRM_DEV_ERROR(dev,
> + "dsi attach failed ret = %d\n", ret);
> + goto err_dsi_attach;
> + }
> +
> + return 0;
> +
> +err_dsi_attach:
> + drm_panel_remove(&ctx->panel);
> + return ret;
> +}
> +
> +static int visionox_rm69299_remove(struct mipi_dsi_device *dsi)
> +{
> + struct visionox_rm69299 *ctx = mipi_dsi_get_drvdata(dsi);
> +
> + if (ctx->dsi) {
> + mipi_dsi_detach(ctx->dsi);
> + mipi_dsi_device_unregister(ctx->dsi);
> + }
> +
> + drm_panel_remove(&ctx->panel);
> + return 0;
> +}
> +
> +static const struct of_device_id visionox_rm69299_of_match[] = {
> + {
> + .compatible = "visionox,rm69299-1080p-display",
Must be updated to the new binding as per Rob's comments.

> + .data = &rm69299_dir,
> + },
> + { }
Use { /* sentinel */ },


> +};
> +MODULE_DEVICE_TABLE(of, visionox_rm69299_of_match);
> +
> +static struct mipi_dsi_driver visionox_rm69299_driver = {
> + .driver = {
> + .name = "panel-visionox-rm69299",
> + .of_match_table = visionox_rm69299_of_match,
> + },
> + .probe = visionox_rm69299_probe,
> + .remove = visionox_rm69299_remove,
> +};
> +module_mipi_dsi_driver(visionox_rm69299_driver);
> +
> +MODULE_DESCRIPTION("VISIONOX RM69299 DSI Panel Driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>
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> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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