Re: [PATCH v2 3/3] drm/panel: Add panel driver for the Mantix MLAF057WE51-X DSI panel

From: Guido Günther
Date: Sun Aug 16 2020 - 13:55:34 EST

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Hi Sam,
thanks for having a look!

On Sat, Aug 15, 2020 at 11:27:27PM +0200, Sam Ravnborg wrote:
> Hi Guido.
>
> On Sat, Aug 15, 2020 at 11:16:22PM +0200, Guido Günther wrote:
> > The panel uses a Focaltech FT8006p, the touch part is handled by the
> > already existing edt-ft5x06.
> >
> > Signed-off-by: Guido Günther <agx@xxxxxxxxxxx>
>
> Two small nits - otherwise looks good.
> Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
>
> I can fix while applying or you can send a new revision,
> but I cannot apply until drm-misc-next have seen a backmerge
> due to dev_err_probe() usage.

I'll send out a v3 with this fixed.

> Did you have commit rights yet?
> If yes, then please apply yourself.

No commit rights here. So it would be great if you could apply the
patches. Should I look for commit rights? I assume that means following

https://drm.pages.freedesktop.org/maintainer-tools/commit-access.html#drm-misc

Cheers,
-- Guido

>
> Sam
>
> > ---
> > MAINTAINERS | 7 +
> > drivers/gpu/drm/panel/Kconfig | 11 +
> > drivers/gpu/drm/panel/Makefile | 1 +
> > .../gpu/drm/panel/panel-mantix-mlaf057we51.c | 328 ++++++++++++++++++
> > 4 files changed, 347 insertions(+)
> > create mode 100644 drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 83ba7b62651f7..7dfe4cc3d4ec8 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -5474,6 +5474,13 @@ S: Maintained
> > F: drivers/gpu/drm/panel/panel-lvds.c
> > F: Documentation/devicetree/bindings/display/panel/lvds.yaml
> >
> > +DRM DRIVER FOR MANTIX MLAF057WE51 PANELS
> > +M: Guido Günther <agx@xxxxxxxxxxx>
> > +R: Purism Kernel Team <kernel@xxxxxxx>
> > +S: Maintained
> > +F: Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > +F: drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
> > +
> > DRM DRIVER FOR MATROX G200/G400 GRAPHICS CARDS
> > S: Orphan / Obsolete
> > F: drivers/gpu/drm/mga/
> > diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> > index de2f2a452be55..8d97d07c58713 100644
> > --- a/drivers/gpu/drm/panel/Kconfig
> > +++ b/drivers/gpu/drm/panel/Kconfig
> > @@ -217,6 +217,17 @@ config DRM_PANEL_NOVATEK_NT39016
> > Say Y here if you want to enable support for the panels built
> > around the Novatek NT39016 display controller.
> >
> > +config DRM_PANEL_MANTIX_MLAF057WE51
> > + tristate "Mantix MLAF057WE51-X MIPI-DSI LCD 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 the Mantix
> > + MLAF057WE51-X MIPI DSI panel as e.g. used in the Librem 5. It
> > + has a resolution of 720x1440 pixels, a built in backlight and touch
> > + controller.
> > +
> > config DRM_PANEL_OLIMEX_LCD_OLINUXINO
> > tristate "Olimex LCD-OLinuXino panel"
> > depends on OF
> > diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> > index e45ceac6286fd..15a4e77529514 100644
> > --- a/drivers/gpu/drm/panel/Makefile
> > +++ b/drivers/gpu/drm/panel/Makefile
> > @@ -20,6 +20,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
> > obj-$(CONFIG_DRM_PANEL_NEC_NL8048HL11) += panel-nec-nl8048hl11.o
> > obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35510) += panel-novatek-nt35510.o
> > obj-$(CONFIG_DRM_PANEL_NOVATEK_NT39016) += panel-novatek-nt39016.o
> > +obj-$(CONFIG_DRM_PANEL_MANTIX_MLAF057WE51) += panel-mantix-mlaf057we51.o
> > obj-$(CONFIG_DRM_PANEL_OLIMEX_LCD_OLINUXINO) += panel-olimex-lcd-olinuxino.o
> > obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o
> > obj-$(CONFIG_DRM_PANEL_OSD_OSD101T2587_53TS) += panel-osd-osd101t2587-53ts.o
> > diff --git a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
> > new file mode 100644
> > index 0000000000000..cd5424d5bdb63
> > --- /dev/null
> > +++ b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
> > @@ -0,0 +1,328 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Mantix MLAF057WE51 5.7" MIPI-DSI panel driver
> > + *
> > + * Copyright (C) Purism SPC 2020
> > + */
> > +
> > +#include <linux/backlight.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/module.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>
> drm_print.h is no longer used - drop.
>
> > +
> > +#define DRV_NAME "panel-mantix-mlaf057we51"
> > +
> > +/* Manufacturer specific Commands send via DSI */
> > +#define MANTIX_CMD_OTP_STOP_RELOAD_MIPI 0x41
> > +#define MANTIX_CMD_INT_CANCEL 0x4C
> > +
> > +struct mantix {
> > + struct device *dev;
> > + struct drm_panel panel;
> > + struct gpio_desc *reset_gpio;
> > +
> > + struct regulator *avdd;
> > + struct regulator *avee;
> > + struct regulator *vddi;
> > +};
> > +
> > +static inline struct mantix *panel_to_mantix(struct drm_panel *panel)
> > +{
> > + return container_of(panel, struct mantix, panel);
> > +}
> > +
> > +#define dsi_generic_write_seq(dsi, seq...) do { \
> > + static const u8 d[] = { seq }; \
> > + int ret; \
> > + ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d)); \
> > + if (ret < 0) \
> > + return ret; \
> > + } while (0)
> > +
> > +static int mantix_init_sequence(struct mantix *ctx)
> > +{
> > + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> > + struct device *dev = ctx->dev;
> > +
> > + /*
> > + * Init sequence was supplied by the panel vendor.
> > + */
> > + dsi_generic_write_seq(dsi, MANTIX_CMD_OTP_STOP_RELOAD_MIPI, 0x5A);
> > +
> > + dsi_generic_write_seq(dsi, MANTIX_CMD_INT_CANCEL, 0x03);
> > + dsi_generic_write_seq(dsi, MANTIX_CMD_OTP_STOP_RELOAD_MIPI, 0x5A, 0x03);
> > + dsi_generic_write_seq(dsi, 0x80, 0xA9, 0x00);
> > +
> > + dsi_generic_write_seq(dsi, MANTIX_CMD_OTP_STOP_RELOAD_MIPI, 0x5A, 0x09);
> > + dsi_generic_write_seq(dsi, 0x80, 0x64, 0x00, 0x64, 0x00, 0x00);
> > + msleep(20);
> > +
> > + dev_dbg(dev, "Panel init sequence done\n");
> > + return 0;
> > +}
> > +
> > +static int mantix_enable(struct drm_panel *panel)
> > +{
> > + struct mantix *ctx = panel_to_mantix(panel);
> > + struct device *dev = ctx->dev;
> > + struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
> > + int ret;
> > +
> > + ret = mantix_init_sequence(ctx);
> > + if (ret < 0) {
> > + dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> > + if (ret < 0) {
> > + dev_err(dev, "Failed to exit sleep mode\n");
> > + return ret;
> > + }
> > + msleep(20);
> > +
> > + ret = mipi_dsi_dcs_set_display_on(dsi);
> > + if (ret)
> > + return ret;
> > + usleep_range(10000, 12000);
> > +
> > + ret = mipi_dsi_turn_on_peripheral(dsi);
> > + if (ret < 0) {
> > + dev_err(dev, "Failed to turn on peripheral\n");
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int mantix_disable(struct drm_panel *panel)
> > +{
> > + struct mantix *ctx = panel_to_mantix(panel);
> > + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> > + int ret;
> > +
> > + ret = mipi_dsi_dcs_set_display_off(dsi);
> > + if (ret < 0)
> > + dev_err(ctx->dev, "Failed to turn off the display: %d\n", ret);
> > +
> > + ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> > + if (ret < 0)
> > + dev_err(ctx->dev, "Failed to enter sleep mode: %d\n", ret);
> > +
> > +
> > + return 0;
> > +}
> > +
> > +static int mantix_unprepare(struct drm_panel *panel)
> > +{
> > + struct mantix *ctx = panel_to_mantix(panel);
> > +
> > + regulator_disable(ctx->avee);
> > + regulator_disable(ctx->avdd);
> > + /* T11 */
> > + usleep_range(5000, 6000);
> > + regulator_disable(ctx->vddi);
> > + /* T14 */
> > + msleep(50);
> > +
> > + return 0;
> > +}
> > +
> > +static int mantix_prepare(struct drm_panel *panel)
> > +{
> > + struct mantix *ctx = panel_to_mantix(panel);
> > + int ret;
> > +
> > + /* Focaltech FT8006P, section 7.3.1 and 7.3.4 */
> > + dev_dbg(ctx->dev, "Resetting the panel\n");
> > + ret = regulator_enable(ctx->vddi);
> > + if (ret < 0) {
> > + dev_err(ctx->dev, "Failed to enable vddi supply: %d\n", ret);
> > + return ret;
> > + }
> Maybe add one empty line here
> > + /* T1 + T2 */
> > + usleep_range(8000, 10000);
> > +
> > + ret = regulator_enable(ctx->avdd);
> > + if (ret < 0) {
> > + dev_err(ctx->dev, "Failed to enable avdd supply: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + /* T2d */
> > + usleep_range(3500, 4000);
> > + ret = regulator_enable(ctx->avee);
> > + if (ret < 0) {
> > + dev_err(ctx->dev, "Failed to enable avee supply: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + /* T3+T5 */
> > + usleep_range(10000, 12000);
> > +
> > + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > + usleep_range(5150, 7000);
> > +
> > + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> > +
> > + /* T6 */
> > + msleep(50);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct drm_display_mode default_mode = {
> > + .hdisplay = 720,
> > + .hsync_start = 720 + 45,
> > + .hsync_end = 720 + 45 + 14,
> > + .htotal = 720 + 45 + 14 + 25,
> > + .vdisplay = 1440,
> > + .vsync_start = 1440 + 130,
> > + .vsync_end = 1440 + 130 + 8,
> > + .vtotal = 1440 + 130 + 8 + 106,
> > + .clock = 85298,
> > + .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> > + .width_mm = 65,
> > + .height_mm = 130,
> > +};
> > +
> > +static int mantix_get_modes(struct drm_panel *panel,
> > + struct drm_connector *connector)
> > +{
> > + struct mantix *ctx = panel_to_mantix(panel);
> > + struct drm_display_mode *mode;
> > +
> > + mode = drm_mode_duplicate(connector->dev, &default_mode);
> > + if (!mode) {
> > + dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
> > + default_mode.hdisplay, default_mode.vdisplay,
> > + drm_mode_vrefresh(mode));
> > + 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 mantix_drm_funcs = {
> > + .disable = mantix_disable,
> > + .unprepare = mantix_unprepare,
> > + .prepare = mantix_prepare,
> > + .enable = mantix_enable,
> > + .get_modes = mantix_get_modes,
> > +};
> > +
> > +static int mantix_probe(struct mipi_dsi_device *dsi)
> > +{
> > + struct device *dev = &dsi->dev;
> > + struct mantix *ctx;
> > + int ret;
> > +
> > + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> > + if (!ctx)
> > + return -ENOMEM;
> > +
> > + ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> > + if (IS_ERR(ctx->reset_gpio)) {
> > + dev_err(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_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> > +
> > + ctx->avdd = devm_regulator_get(dev, "avdd");
> > + if (IS_ERR(ctx->avdd))
> > + return dev_err_probe(dev, PTR_ERR(ctx->avdd), "Failed to request avdd regulator\n");
> > +
> > + ctx->avee = devm_regulator_get(dev, "avee");
> > + if (IS_ERR(ctx->avee))
> > + return dev_err_probe(dev, PTR_ERR(ctx->avee), "Failed to request avee regulator\n");
> > +
> > + ctx->vddi = devm_regulator_get(dev, "vddi");
> > + if (IS_ERR(ctx->vddi))
> > + return dev_err_probe(dev, PTR_ERR(ctx->vddi), "Failed to request vddi regulator\n");
> > +
> > + drm_panel_init(&ctx->panel, dev, &mantix_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) {
> > + dev_err(dev, "mipi_dsi_attach failed (%d). Is host ready?\n", ret);
> > + drm_panel_remove(&ctx->panel);
> > + return ret;
> > + }
> > +
> > + dev_info(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
> > + default_mode.hdisplay, default_mode.vdisplay,
> > + drm_mode_vrefresh(&default_mode),
> > + mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
> > +
> > + return 0;
> > +}
> > +
> > +static void mantix_shutdown(struct mipi_dsi_device *dsi)
> > +{
> > + struct mantix *ctx = mipi_dsi_get_drvdata(dsi);
> > +
> > + drm_panel_unprepare(&ctx->panel);
> > + drm_panel_disable(&ctx->panel);
> > +}
> > +
> > +static int mantix_remove(struct mipi_dsi_device *dsi)
> > +{
> > + struct mantix *ctx = mipi_dsi_get_drvdata(dsi);
> > +
> > + mantix_shutdown(dsi);
> > +
> > + mipi_dsi_detach(dsi);
> > + drm_panel_remove(&ctx->panel);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id mantix_of_match[] = {
> > + { .compatible = "mantix,mlaf057we51-x" },
> > + { /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, mantix_of_match);
> > +
> > +static struct mipi_dsi_driver mantix_driver = {
> > + .probe = mantix_probe,
> > + .remove = mantix_remove,
> > + .shutdown = mantix_shutdown,
> > + .driver = {
> > + .name = DRV_NAME,
> > + .of_match_table = mantix_of_match,
> > + },
> > +};
> > +module_mipi_dsi_driver(mantix_driver);
> > +
> > +MODULE_AUTHOR("Guido Günther <agx@xxxxxxxxxxx>");
> > +MODULE_DESCRIPTION("DRM driver for Mantix MLAF057WE51-X MIPI DSI panel");
> > +MODULE_LICENSE("GPL v2");
> > --
> > 2.26.2
>

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