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References: <20200421045508.21137-1-harigovi@codeaurora.org>
 <20200421045508.21137-2-harigovi@codeaurora.org> <20200506185703.GB8227@ravnborg.org>
In-Reply-To: <20200506185703.GB8227@ravnborg.org>
From:   Dave Airlie <airlied@gmail.com>
Date:   Thu, 14 May 2020 13:35:22 +1000
Message-ID: <CAPM=9twxp8xBRyBCGntn8OVuwOX0i+ZSMfZBcHEtT5zQ=L7foA@mail.gmail.com>
Subject: Re: [PATCH v11 1/2] drm/panel: add support for rm69299 visionox panel driver
To:     Sam Ravnborg <sam@ravnborg.org>
Cc:     Harigovindan P <harigovi@codeaurora.org>,
        freedreno <freedreno@lists.freedesktop.org>,
        devicetree@vger.kernel.org,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Matthias Kaehlcke <mka@chromium.org>,
        Sean Paul <seanpaul@chromium.org>, Sean Paul <sean@poorly.run>
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On Thu, 7 May 2020 at 04:57, Sam Ravnborg <sam@ravnborg.org> wrote:
>
> Hi Harigovindan
>
> On Wed, Apr 29, 2020 at 11:15:14AM +0530, Harigovindan P wrote:
> > Add support for Visionox panel driver.
> >
> > Signed-off-by: Harigovindan P <harigovi@codeaurora.org>
> > Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
>
> Thanks for your persistence on this.
> Patch applied.
>
> I fixed a few lingering --strict releated checkpatch warnings
> when I applied.
>
>         Sam

I'm seeing

WARNING: modpost: missing MODULE_LICENSE() in
drivers/gpu/drm/panel/panel-visionox-rm69299.o

Can we fix that up?

Dave.

>
> > ---
> >
> > Changes in v2:
> >       - Dropping redundant space in Kconfig(Sam Ravnborg).
> >       - Changing structure for include files(Sam Ravnborg).
> >       - Removing backlight related code and functions(Sam Ravnborg).
> >       - Removing repeated printing of error message(Sam Ravnborg).
> >       - Adding drm_connector as an argument for get_modes function.
> > Changes in v3:
> >       - Adding arguments for drm_panel_init to support against mainline.
> > Changes in v4:
> >       - Removing error messages from regulator_set_load.
> >       - Removing dev struct entry.
> >       - Removing checks.
> >       - Dropping empty comment lines.
> > Changes in v5:
> >       - Removing unused struct member variables.
> >       - Removing blank lines.
> >       - Fixed indentation.
> >       - Invoking dsi_detach and panel_remove while early exiting from probe.
> > Changes in v6:
> >       - Changed "35597" to "rm69299" for power_on function.
> >       - Removing rm69299_config since it supports single type of panel for now.
> >       - Fixed alignment.
> >       - Using goto statements when regulator_set_load fails.
> > Changes in v7:
> >       - Added new goto statement when regulator_set_load fails.
> > Changes in v8,v9,v10:
> >       - Had changes in first patch, did not make any change in panel driver.
> > Changes in v11:
> >       - Fixing checkpatch script errors.
> >       - Updated assignment of panel.dev property in  probe.
> >
> >  drivers/gpu/drm/panel/Kconfig                 |   8 +
> >  drivers/gpu/drm/panel/Makefile                |   1 +
> >  .../gpu/drm/panel/panel-visionox-rm69299.c    | 304 ++++++++++++++++++
> >  3 files changed, 313 insertions(+)
> >  create mode 100644 drivers/gpu/drm/panel/panel-visionox-rm69299.c
> >
> > diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> > index d56258b9fcaf..4b6131f5893d 100644
> > --- a/drivers/gpu/drm/panel/Kconfig
> > +++ b/drivers/gpu/drm/panel/Kconfig
> > @@ -444,6 +444,14 @@ config DRM_PANEL_TRULY_NT35597_WQXGA
> >         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.
> > +
> >  config DRM_PANEL_XINPENG_XPP055C272
> >       tristate "Xinpeng XPP055C272 panel driver"
> >       depends on OF
> > diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> > index 2335a1e32ae0..8eac3e6fa82c 100644
> > --- a/drivers/gpu/drm/panel/Makefile
> > +++ b/drivers/gpu/drm/panel/Makefile
> > @@ -47,4 +47,5 @@ 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-$(CONFIG_DRM_PANEL_VISIONOX_RM69299) += panel-visionox-rm69299.o
> >  obj-$(CONFIG_DRM_PANEL_XINPENG_XPP055C272) += panel-xinpeng-xpp055c272.o
> > diff --git a/drivers/gpu/drm/panel/panel-visionox-rm69299.c b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
> > new file mode 100644
> > index 000000000000..3ef4cc80044a
> > --- /dev/null
> > +++ b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
> > @@ -0,0 +1,304 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/regulator/consumer.h>
> > +
> > +#include <video/mipi_display.h>
> > +
> > +#include <drm/drm_mipi_dsi.h>
> > +#include <drm/drm_modes.h>
> > +#include <drm/drm_panel.h>
> > +#include <drm/drm_print.h>
> > +
> > +struct visionox_rm69299 {
> > +     struct drm_panel panel;
> > +     struct regulator_bulk_data supplies[2];
> > +     struct gpio_desc *reset_gpio;
> > +     struct mipi_dsi_device *dsi;
> > +     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_rm69299_power_on(struct visionox_rm69299 *ctx)
> > +{
> > +     int 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)
> > +{
> > +     gpiod_set_value(ctx->reset_gpio, 0);
> > +
> > +     return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> > +}
> > +
> > +static int visionox_rm69299_unprepare(struct drm_panel *panel)
> > +{
> > +     struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> > +     int ret;
> > +
> > +     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->panel.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->panel.dev,
> > +                     "enter_sleep cmd failed ret = %d\n", ret);
> > +     }
> > +
> > +     ret = visionox_rm69299_power_off(ctx);
> > +
> > +     ctx->prepared = false;
> > +     return ret;
> > +}
> > +
> > +static int visionox_rm69299_prepare(struct drm_panel *panel)
> > +{
> > +     struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> > +     int ret;
> > +
> > +     if (ctx->prepared)
> > +             return 0;
> > +
> > +     ret = visionox_rm69299_power_on(ctx);
> > +     if (ret < 0)
> > +             return ret;
> > +
> > +     ctx->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> > +
> > +     ret = mipi_dsi_dcs_write_buffer(ctx->dsi, (u8[]){ 0xfe, 0x00 }, 2);
> > +     if (ret < 0) {
> > +             DRM_DEV_ERROR(ctx->panel.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->panel.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->panel.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->panel.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->panel.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->panel.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:
> > +     return ret;
> > +}
> > +
> > +static const struct drm_display_mode visionox_rm69299_1080x2248_60hz = {
> > +     .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 int visionox_rm69299_get_modes(struct drm_panel *panel,
> > +                                   struct drm_connector *connector)
> > +{
> > +     struct visionox_rm69299 *ctx = panel_to_ctx(panel);
> > +     struct drm_display_mode *mode;
> > +
> > +     mode = drm_mode_create(connector->dev);
> > +     if (!mode) {
> > +             DRM_DEV_ERROR(ctx->panel.dev,
> > +                     "failed to create a new display mode\n");
> > +             return 0;
> > +     }
> > +
> > +     connector->display_info.width_mm = 74;
> > +     connector->display_info.height_mm = 131;
> > +     drm_mode_copy(mode, &visionox_rm69299_1080x2248_60hz);
> > +     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 = {
> > +     .unprepare = visionox_rm69299_unprepare,
> > +     .prepare = visionox_rm69299_prepare,
> > +     .get_modes = visionox_rm69299_get_modes,
> > +};
> > +
> > +static int visionox_rm69299_probe(struct mipi_dsi_device *dsi)
> > +{
> > +     struct device *dev = &dsi->dev;
> > +     struct visionox_rm69299 *ctx;
> > +     int ret;
> > +
> > +     ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> > +     if (!ctx)
> > +             return -ENOMEM;
> > +
> > +     mipi_dsi_set_drvdata(dsi, ctx);
> > +
> > +     ctx->panel.dev = dev;
> > +     ctx->dsi = dsi;
> > +
> > +     ctx->supplies[0].supply = "vdda";
> > +     ctx->supplies[1].supply = "vdd3p3";
> > +
> > +     ret = devm_regulator_bulk_get(ctx->panel.dev, ARRAY_SIZE(ctx->supplies),
> > +                                   ctx->supplies);
> > +     if (ret < 0)
> > +             return ret;
> > +
> > +     ctx->reset_gpio = devm_gpiod_get(ctx->panel.dev,
> > +                                     "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, dev, &visionox_rm69299_drm_funcs,
> > +                    DRM_MODE_CONNECTOR_DSI);
> > +     ctx->panel.dev = dev;
> > +     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;
> > +     }
> > +
> > +     ret = regulator_set_load(ctx->supplies[0].consumer, 32000);
> > +     if (ret) {
> > +             DRM_DEV_ERROR(dev,
> > +                     "regulator set load failed for vdda supply ret = %d\n",
> > +                     ret);
> > +             goto err_set_load;
> > +     }
> > +
> > +     ret = regulator_set_load(ctx->supplies[1].consumer, 13200);
> > +     if (ret) {
> > +             DRM_DEV_ERROR(dev,
> > +                     "regulator set load failed for vdd3p3 supply ret = %d\n",
> > +                     ret);
> > +             goto err_set_load;
> > +     }
> > +
> > +     return 0;
> > +
> > +err_set_load:
> > +     mipi_dsi_detach(dsi);
> > +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);
> > +
> > +     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",
> > +     }
> > +};
> > +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");
> > +
> > --
> > 2.25.1
> > _______________________________________________
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> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
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