Re: [DPU PATCH v2 1/2] drm/panel: Add Truly NT35597 panel

[Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

Hi,

On Saturday 14 April 2018 12:55 PM, Abhinav Kumar wrote:
> From: Archit Taneja <architt@codeaurora.org>

You can drop DPU from the subject. Also, you'd need to add
Theirry Reading for panel related patches, and Rob Herring
for an Ack on the DT bindings.

I think you can change the author to yourself. You've had to
make plenty of changes to get this in upstream state. You
can keep my Signed-off-by, though.

> 
> Add support for Truly NT35597 panel used
> in MSM reference platforms.

You can mention here that the panel supports both single
and dual DSI modes, and that we support only dual-DSI
mode for now.

> 
> Changes in v2:
> - Renamed panel to truly,nt35597
> - Added SPDX license
> - Used endpoints instead of custom node
> - Renamed and cleaned up power supplies
> 
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
> ---
>   .../devicetree/bindings/display/truly,nt35597.txt  |  47 ++
>   drivers/gpu/drm/panel/Kconfig                      |   7 +
>   drivers/gpu/drm/panel/Makefile                     |   1 +
>   drivers/gpu/drm/panel/panel-truly-nt35597.c        | 597 +++++++++++++++++++++
>   4 files changed, 652 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/display/truly,nt35597.txt
>   create mode 100644 drivers/gpu/drm/panel/panel-truly-nt35597.c
> 
> diff --git a/Documentation/devicetree/bindings/display/truly,nt35597.txt b/Documentation/devicetree/bindings/display/truly,nt35597.txt
> new file mode 100644
> index 0000000..22b6f19
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/truly,nt35597.txt
> @@ -0,0 +1,47 @@
> +Truly model NT35597 1440x2560 DSI Panel
> +
> +Required properties:
> +- compatible: should be "truly,nt35597"
> +- vdda-supply: phandle of the regulator that provides the supply voltage
> +  Power IC supply
> +- vdispp-supply: phandle of the regulator that provides the supply voltage
> +  for positive LCD bias
> +- vdispn-supply: phandle of the regulator that provides the supply voltage
> +  for negative LCD bias
> +- reset-gpios: phandle of gpio for reset line
> +  This should be 8mA, gpio can be configured using mux, pinctrl, pinctrl-names
> +- mode-gpios: phandle of the gpio for choosing the mode of the display
> +  for single DSI or Dual DSI
> +  This should be low for dual DSI and high for single DSI mode
> +- display-timings: Node for the Panel timings
> +

You need to specify the of-graph bindings here. Especially, what port #
corresponds to master DSI, and what # for slave DSI.

> +Example:
> +
> +	dsi@ae94000 {
> +		panel@0 {
> +			compatible = "truly,nt35597";
> +			reg = <0>;
> +			vdda-supply = <&pm8998_l14>;
> +			vdispp-supply = <&lab_regulator>;
> +			vdispn-supply = <&ibb_regulator>;
> +			pinctrl-names = "default", "suspend";
> +			pinctrl-0 = <&sde_dsi_active>;
> +			pinctrl-1 = <&sde_dsi_suspend>;
> +
> +			reset-gpios = <&tlmm 6 0>;
> +			mode-gpios = <&tlmm 52 0>;
> +			display-timings {
> +				timing0: timing-0 {
> +					clock-frequency = <268316138>;
> +					hactive = <1440>;
> +					vactie = <2560>;
> +					hfront-porch = <200>;
> +					hback-porch = <64>;
> +					hsync-len = <32>;
> +					vfront-porch = <8>;
> +					vback-porch = <7>;
> +					vsync-len = <1>;
> +				};
> +			};
> +		};

The example should specify the port too.

> +	};
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 988048e..9f0c490 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -168,4 +168,11 @@ config DRM_PANEL_SITRONIX_ST7789V
>   	  Say Y here if you want to enable support for the Sitronix
>   	  ST7789V controller for 240x320 LCD panels
>   
> +config DRM_PANEL_TRULY_NT35597_WQXGA
> +	tristate "Truly WQXGA"
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	help
> +	  Say Y here if you want to enable support for Truly NT35597 WQXGA Dual DSI
> +	  Video Mode panel
>   endmenu
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 3d2a88d..b5b4b60 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -17,3 +17,4 @@ obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
>   obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
>   obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
>   obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
> +obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
> diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
> new file mode 100644
> index 0000000..5bd5fdc
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
> @@ -0,0 +1,597 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/pinctrl/consumer.h>
> +
> +#include <video/mipi_display.h>
> +#include <video/of_videomode.h>
> +#include <video/videomode.h>
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_mipi_dsi.h>
> +
> +static const char * const regulator_names[] = {
> +	"vdda",
> +	"vdispp",
> +	"vdispn"
> +};
> +
> +static unsigned long regulator_enable_loads[] = {
> +	62000,
> +	100000,
> +	100000};

coding style nit: the closing bracket should come on the next line.
> +
> +static unsigned long regulator_disable_loads[] = {
> +	80,
> +	100,
> +	100};
> +

Same here.

> +struct truly_wqxga {
> +	struct device *dev;
> +	struct drm_panel panel;
> +
> +	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> +
> +	struct gpio_desc *reset_gpio;
> +	struct gpio_desc *mode_gpio;
> +
> +	struct backlight_device *backlight;
> +	struct videomode vm;
> +
> +	struct mipi_dsi_device *dsi[2];
> +
> +	bool prepared;
> +	bool enabled;
> +};
> +
> +static inline struct truly_wqxga *panel_to_truly_wqxga(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct truly_wqxga, panel);
> +}
> +
> +static int truly_wqxga_power_on(struct truly_wqxga *ctx)
> +{
> +	int ret, i;
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
> +		ret = regulator_set_load(ctx->supplies[i].consumer,
> +				regulator_enable_loads[i]);

coding style nit: the func argument should be aligned with the opening
parenthesis.

> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(20);
> +	gpiod_set_value(ctx->reset_gpio, 1);
> +	usleep_range(20000, 20100);
> +	gpiod_set_value(ctx->reset_gpio, 0);
> +	usleep_range(20000, 20100);
> +	gpiod_set_value(ctx->reset_gpio, 1);
> +	usleep_range(50000, 50100);

Accoridng to Documentation/timers/timers-howto.txt, you're supposed to
use msleep if the delays are >= 20 ms.

> +
> +	/* dual port */
> +	gpiod_set_value(ctx->mode_gpio, 0);

Maybe we can set this just once during probe, since we don't support
single channel DSI?

> +
> +	return 0;
> +}
> +
> +static int truly_wqxga_power_off(struct truly_wqxga *ctx)
> +{
> +	int ret, i;
> +
> +	gpiod_set_value(ctx->reset_gpio, 0);
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
> +		ret = regulator_set_load(ctx->supplies[i].consumer,
> +				regulator_disable_loads[i]);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +}
> +
> +static int truly_wqxga_disable(struct drm_panel *panel)
> +{
> +	struct truly_wqxga *ctx = panel_to_truly_wqxga(panel);
> +
> +	if (!ctx->enabled)
> +		return 0;
> +
> +	if (ctx->backlight) {
> +		ctx->backlight->props.power = FB_BLANK_POWERDOWN;
> +		backlight_update_status(ctx->backlight);
> +	}
> +
> +	ctx->enabled = false;
> +	return 0;
> +}
> +
> +static int truly_wqxga_unprepare(struct drm_panel *panel)
> +{
> +	struct truly_wqxga *ctx = panel_to_truly_wqxga(panel);
> +	struct mipi_dsi_device **dsis = ctx->dsi;
> +	int ret = 0, i;
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	dsis[0]->mode_flags = 0;
> +	dsis[1]->mode_flags = 0;
> +
> +	for (i = 0; i < 2; i++)
> +		if (mipi_dsi_dcs_set_display_off(dsis[i]) < 0)
> +			ret = -ECOMM;
> +	msleep(78);
> +
> +	for (i = 0; i < 2; i++)
> +		if (mipi_dsi_dcs_enter_sleep_mode(dsis[i]) < 0)
> +			ret = -ECOMM;
> +	msleep(78);

Could you cross check if we need these sleeps for unprepare too?

> +
> +	truly_wqxga_power_off(ctx);
> +
> +	ctx->prepared = false;
> +	return ret;
> +}
> +
> +#define MAX_LEN	5
> +struct {
> +	u8 commands[MAX_LEN];
> +	int size;
> +} panel_cmds[] = { /* CMD2_P0 */
> +		   { { 0xff, 0x20 }, 2 },
> +		   { { 0xfb, 0x01 }, 2 },
> +		   { { 0x00, 0x01 }, 2 },
> +		   { { 0x01, 0x55 }, 2 },
> +		   { { 0x02, 0x45 }, 2 },
> +		   { { 0x05, 0x40 }, 2 },
> +		   { { 0x06, 0x19 }, 2 },
> +		   { { 0x07, 0x1e }, 2 },
> +		   { { 0x0b, 0x73 }, 2 },
> +		   { { 0x0c, 0x73 }, 2 },
> +		   { { 0x0e, 0xb0 }, 2 },
> +		   { { 0x0f, 0xae }, 2 },
> +		   { { 0x11, 0xb8 }, 2 },
> +		   { { 0x13, 0x00 }, 2 },
> +		   { { 0x58, 0x80 }, 2 },
> +		   { { 0x59, 0x01 }, 2 },
> +		   { { 0x5a, 0x00 }, 2 },
> +		   { { 0x5b, 0x01 }, 2 },
> +		   { { 0x5c, 0x80 }, 2 },
> +		   { { 0x5d, 0x81 }, 2 },
> +		   { { 0x5e, 0x00 }, 2 },
> +		   { { 0x5f, 0x01 }, 2 },
> +		   { { 0x72, 0x11 }, 2 },
> +		   { { 0x68, 0x03 }, 2 },
> +		   /* CMD2_P4 */
> +		   { { 0xFF, 0x24 }, 2 },
> +		   { { 0xFB, 0x01 }, 2 },
> +		   { { 0x00, 0x1C }, 2 },
> +		   { { 0x01, 0x0B }, 2 },
> +		   { { 0x02, 0x0C }, 2 },
> +		   { { 0x03, 0x01 }, 2 },
> +		   { { 0x04, 0x0F }, 2 },
> +		   { { 0x05, 0x10 }, 2 },
> +		   { { 0x06, 0x10 }, 2 },
> +		   { { 0x07, 0x10 }, 2 },
> +		   { { 0x08, 0x89 }, 2 },
> +		   { { 0x09, 0x8A }, 2 },
> +		   { { 0x0A, 0x13 }, 2 },
> +		   { { 0x0B, 0x13 }, 2 },
> +		   { { 0x0C, 0x15 }, 2 },
> +		   { { 0x0D, 0x15 }, 2 },
> +		   { { 0x0E, 0x17 }, 2 },
> +		   { { 0x0F, 0x17 }, 2 },
> +		   { { 0x10, 0x1C }, 2 },
> +		   { { 0x11, 0x0B }, 2 },
> +		   { { 0x12, 0x0C }, 2 },
> +		   { { 0x13, 0x01 }, 2 },
> +		   { { 0x14, 0x0F }, 2 },
> +		   { { 0x15, 0x10 }, 2 },
> +		   { { 0x16, 0x10 }, 2 },
> +		   { { 0x17, 0x10 }, 2 },
> +		   { { 0x18, 0x89 }, 2 },
> +		   { { 0x19, 0x8A }, 2 },
> +		   { { 0x1A, 0x13 }, 2 },
> +		   { { 0x1B, 0x13 }, 2 },
> +		   { { 0x1C, 0x15 }, 2 },
> +		   { { 0x1D, 0x15 }, 2 },
> +		   { { 0x1E, 0x17 }, 2 },
> +		   { { 0x1F, 0x17 }, 2 },
> +		   /* STV */
> +		   { { 0x20, 0x40 }, 2 },
> +		   { { 0x21, 0x01 }, 2 },
> +		   { { 0x22, 0x00 }, 2 },
> +		   { { 0x23, 0x40 }, 2 },
> +		   { { 0x24, 0x40 }, 2 },
> +		   { { 0x25, 0x6D }, 2 },
> +		   { { 0x26, 0x40 }, 2 },
> +		   { { 0x27, 0x40 }, 2 },
> +		   /* Vend */
> +		   { { 0xE0, 0x00 }, 2 },
> +		   { { 0xDC, 0x21 }, 2 },
> +		   { { 0xDD, 0x22 }, 2 },
> +		   { { 0xDE, 0x07 }, 2 },
> +		   { { 0xDF, 0x07 }, 2 },
> +		   { { 0xE3, 0x6D }, 2 },
> +		   { { 0xE1, 0x07 }, 2 },
> +		   { { 0xE2, 0x07 }, 2 },
> +		   /* UD */
> +		   { { 0x29, 0xD8 }, 2 },
> +		   { { 0x2A, 0x2A }, 2 },
> +		   /* CLK */
> +		   { { 0x4B, 0x03 }, 2 },
> +		   { { 0x4C, 0x11 }, 2 },
> +		   { { 0x4D, 0x10 }, 2 },
> +		   { { 0x4E, 0x01 }, 2 },
> +		   { { 0x4F, 0x01 }, 2 },
> +		   { { 0x50, 0x10 }, 2 },
> +		   { { 0x51, 0x00 }, 2 },
> +		   { { 0x52, 0x80 }, 2 },
> +		   { { 0x53, 0x00 }, 2 },
> +		   { { 0x56, 0x00 }, 2 },
> +		   { { 0x54, 0x07 }, 2 },
> +		   { { 0x58, 0x07 }, 2 },
> +		   { { 0x55, 0x25 }, 2 },
> +		   /* Reset XDONB */
> +		   { { 0x5B, 0x43 }, 2 },
> +		   { { 0x5C, 0x00 }, 2 },
> +		   { { 0x5F, 0x73 }, 2 },
> +		   { { 0x60, 0x73 }, 2 },
> +		   { { 0x63, 0x22 }, 2 },
> +		   { { 0x64, 0x00 }, 2 },
> +		   { { 0x67, 0x08 }, 2 },
> +		   { { 0x68, 0x04 }, 2 },
> +		   /* Resolution:1440x2560 */
> +		   { { 0x72, 0x02 }, 2 },
> +		   /* mux */
> +		   { { 0x7A, 0x80 }, 2 },
> +		   { { 0x7B, 0x91 }, 2 },
> +		   { { 0x7C, 0xD8 }, 2 },
> +		   { { 0x7D, 0x60 }, 2 },
> +		   { { 0x7F, 0x15 }, 2 },
> +		   { { 0x75, 0x15 }, 2 },
> +		   /* ABOFF */
> +		   { { 0xB3, 0xC0 }, 2 },
> +		   { { 0xB4, 0x00 }, 2 },
> +		   { { 0xB5, 0x00 }, 2 },
> +		   /* Source EQ */
> +		   { { 0x78, 0x00 }, 2 },
> +		   { { 0x79, 0x00 }, 2 },
> +		   { { 0x80, 0x00 }, 2 },
> +		   { { 0x83, 0x00 }, 2 },
> +		   /* FP BP */
> +		   { { 0x93, 0x0A }, 2 },
> +		   { { 0x94, 0x0A }, 2 },
> +		   /* Inversion Type */
> +		   { { 0x8A, 0x00 }, 2 },
> +		   { { 0x9B, 0xFF }, 2 },
> +		   /* IMGSWAP =1 @PortSwap=1 */
> +		   { { 0x9D, 0xB0 }, 2 },
> +		   { { 0x9F, 0x63 }, 2 },
> +		   { { 0x98, 0x10 }, 2 },
> +		   /* FRM */
> +		   { { 0xEC, 0x00 }, 2 },
> +		   /* CMD1 */
> +		   { { 0xFF, 0x10 }, 2 },
> +		    /* VBP+VSA=,VFP = 10H */
> +		   { { 0x3B, 0x03, 0x0A, 0x0A, }, 4 },
> +		   /* FTE on */
> +		   { { 0x35, 0x00 }, 2 },
> +		   /* EN_BK =1(auto black) */
> +		   { { 0xE5, 0x01 }, 2 },
> +		   /* CMD mode(10) VDO mode(03) */
> +		   { { 0xBB, 0x03 }, 2 },
> +		   /* Non Reload MTP */
> +		   { { 0xFB, 0x01 }, 2 },
> +};
> +
> +static int truly_wqxga_prepare(struct drm_panel *panel)
> +{
> +	struct truly_wqxga *ctx = panel_to_truly_wqxga(panel);
> +	struct mipi_dsi_device **dsis = ctx->dsi;
> +	struct mipi_dsi_device *d;
> +	int ret, i, j;
> +
> +	if (ctx->prepared)
> +		return 0;
> +
> +	ret = truly_wqxga_power_on(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	dsis[0]->mode_flags |= MIPI_DSI_MODE_LPM;
> +	dsis[1]->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	for (j = 0; j < ARRAY_SIZE(panel_cmds); j++) {
> +		for (i = 0; i < 2; i++) {
> +			d = dsis[i];
> +			ret = mipi_dsi_dcs_write_buffer(dsis[i],
> +					panel_cmds[j].commands,
> +					panel_cmds[j].size);
> +			if (ret < 0) {
> +				dev_err(ctx->dev, "failed to cmd no %d, err: %d\n",
> +						j, ret);
> +				return ret;
> +			}
> +		}
> +	}
> +
> +

Unnecessary extra blank here.

> +	for (i = 0; i < 2; i++)
> +		if (mipi_dsi_dcs_exit_sleep_mode(dsis[i]) < 0) {
> +			dev_err(ctx->dev, "failed to exit sleep mode\n");
> +			return -ECOMM;
> +		}
> +	msleep(78);
> +
> +	for (i = 0; i < 2; i++)
> +		if (mipi_dsi_dcs_set_display_on(dsis[i]) < 0) {
> +			dev_err(ctx->dev, "failed to send display on\n");
> +			return -ECOMM;
> +		}
> +	msleep(78);
> +
> +	ctx->prepared = true;
> +
> +	return 0;
> +}
> +
> +static int truly_wqxga_enable(struct drm_panel *panel)
> +{
> +	struct truly_wqxga *ctx = panel_to_truly_wqxga(panel);
> +
> +	if (ctx->enabled)
> +		return 0;
> +
> +	if (ctx->backlight) {
> +		ctx->backlight->props.power = FB_BLANK_UNBLANK;
> +		backlight_update_status(ctx->backlight);
> +	}
> +	ctx->enabled = true;
> +
> +	return 0;
> +}
> +
> +static int truly_wqxga_get_modes(struct drm_panel *panel)
> +{
> +	struct drm_connector *connector = panel->connector;
> +	struct truly_wqxga *ctx = panel_to_truly_wqxga(panel);
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_create(connector->dev);
> +	if (!mode) {
> +		dev_err(ctx->dev, "failed to create a new display mode\n");
> +		return 0;
> +	}
> +
> +	drm_display_mode_from_videomode(&ctx->vm, mode);
> +	connector->display_info.width_mm = 74;
> +	connector->display_info.height_mm = 131;
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	drm_mode_probed_add(connector, mode);
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs truly_wqxga_drm_funcs = {
> +	.disable = truly_wqxga_disable,
> +	.unprepare = truly_wqxga_unprepare,
> +	.prepare = truly_wqxga_prepare,
> +	.enable = truly_wqxga_enable,
> +	.get_modes = truly_wqxga_get_modes,
> +};
> +
> +static int truly_wqxga_panel_add(struct truly_wqxga *ctx)
> +{
> +	struct device *dev = ctx->dev;
> +	int ret, i;
> +
> +	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)
> +		return ret;
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		dev_err(dev, "cannot get reset-gpios %ld\n",
> +			PTR_ERR(ctx->reset_gpio));
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	ctx->mode_gpio = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->mode_gpio)) {
> +		dev_err(dev, "cannot get mode gpio %ld\n",
> +			PTR_ERR(ctx->mode_gpio));
> +		ctx->mode_gpio = NULL;
> +		return PTR_ERR(ctx->mode_gpio);
> +	}
> +
> +	ret = pinctrl_pm_select_default_state(dev);
> +	if (ret) {
> +		dev_err(dev, "%s: failed to set pinctrl default state, %d\n",
> +			__func__, ret);
> +		return ret;
> +	}

This might be unnecessary, I think this may be done in
drivers/base/dd.c. I'm not a 100% sure though.

> +
> +	ret = of_get_videomode(dev->of_node, &ctx->vm, 0);
> +	if (ret < 0)
> +		return ret;
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = dev;
> +	ctx->panel.funcs = &truly_wqxga_drm_funcs;
> +	drm_panel_add(&ctx->panel);
> +
> +	return 0;
> +}
> +
> +static void truly_wqxga_panel_del(struct truly_wqxga *ctx)
> +{
> +	if (ctx->panel.dev)
> +		drm_panel_remove(&ctx->panel);
> +}
> +
> +static int truly_wqxga_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct truly_wqxga *ctx;
> +	struct mipi_dsi_device *secondary = NULL;

We don't need to set it to NULL here.

> +	struct device_node *dsi1;
> +	struct mipi_dsi_host *dsi1_host;
> +	int ret = 0;
> +	const struct mipi_dsi_device_info info = {.type = "trulynt35597",
> +		.channel = 0,
> +		.node = NULL,
> +	};
> +
> +	/* This device represents itself as one with
> +	 * two input ports which are fed by the output
> +	 * ports of the two DSI controllers . The DSI0
> +	 * is the master controller and has most of the
> +	 * panel related info in its child node.
> +	 */
> +
> +	/* configure master DSI device */
> +	dsi->lanes = 4;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_CLOCK_NON_CONTINUOUS |
> +	MIPI_DSI_MODE_LPM;

Could we move the master DSI settings just before we call
mipi_dsi_attach() on it?

> +
> +	/* get the dsi1 output port node */
> +	dsi1 = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
> +	if (!dsi1) {
> +		dev_err(dev, "failed to get remote node\n")You could mention 'remote node for secondary DSI' for the sake of
clarity.
> +		return -ENODEV;
> +	}
> +
> +	dsi1_host = of_find_mipi_dsi_host_by_node(dsi1);
> +	if (!dsi1_host) {
> +		dev_err(dev, "failed to find dsi host\n");
> +		ret = -EPROBE_DEFER;
> +		goto err_host;
> +	}
> +
> +	/* register the second DSI device */
> +	secondary = mipi_dsi_device_register_full(dsi1_host,
> +		&info);

coding style nit: needs to be aligned with opening parenthesis.

> +
> +	if (IS_ERR(secondary)) {
> +		dev_err(dev, "failed to create dsi device\n");
> +		ret = PTR_ERR(dsi);
> +		goto err_dsi_device;
> +	}
> +
> +	/* configure secondary DSI device */
> +	secondary->lanes = 4;
> +	secondary->format = MIPI_DSI_FMT_RGB888;
> +	secondary->mode_flags = MIPI_DSI_MODE_VIDEO |
> +		MIPI_DSI_CLOCK_NON_CONTINUOUS |
> +		MIPI_DSI_MODE_LPM;

This could be similarly moved just before calling mipi_dsi_attach()
on the secondary DSI device.

> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +

Allocating context is generally the first thing done in probe. It should
simplify the error handling a bit too.

> +	if (!ctx) {
> +		ret = -ENOMEM;
> +		goto err_dsi_ctx;
> +	}
> +
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	ctx->dev = dev;
> +	ctx->dsi[0] = dsi;
> +	ctx->dsi[1] = secondary;
> +
> +	ret = truly_wqxga_panel_add(ctx);
> +	if (ret) {
> +		dev_err(dev, "failed to add panel\n");
> +		goto err_panel_add;
> +	}
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "master dsi attach failed\n");
> +		goto err_dsi_attach;
> +	}
> +
> +	ret = mipi_dsi_attach(secondary);
> +	if (ret < 0) {
> +		dev_err(dev, "mipi_dsi_attach on secondary failed\n");
> +		goto err_dsi_attach_sec;
> +	}
> +
> +	of_node_put(dsi1);

This should be done just after we call of_find_mipi_dsi_host_by_node()
for clarity.

> +
> +	return 0;
> +
> +err_dsi_attach_sec:
> +	mipi_dsi_detach(ctx->dsi[0]);
> +err_dsi_attach:
> +	truly_wqxga_panel_del(ctx);
> +err_panel_add:
> +	mipi_dsi_device_unregister(secondary);
> +err_dsi_ctx:
> +err_dsi_device:
> +err_host:
> +	of_node_put(dsi1);
> +	return ret;
> +}
> +
> +static int truly_wqxga_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct truly_wqxga *ctx = mipi_dsi_get_drvdata(dsi);
> +
> +	if (ctx) {

I don't think we need the check above.
> +		if (ctx->dsi[0])
> +			mipi_dsi_detach(ctx->dsi[0]);
> +		if (ctx->dsi[1]) {
> +			mipi_dsi_detach(ctx->dsi[1]);
> +			mipi_dsi_device_unregister(ctx->dsi[1]);
> +		}
> +		truly_wqxga_panel_del(ctx);
> +		kfree(ctx);

You shouldn't free stuff that's allocated using devm_ funcs.

> +	}
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id truly_wqxga_of_match[] = {
> +	{ .compatible = "truly,nt35597", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, truly_wqxga_of_match);
> +
> +static struct mipi_dsi_driver truly_wqxga_driver = {
> +	.driver = {
> +		.name = "panel_truly_nt35597",
> +		.of_match_table = truly_wqxga_of_match,
> +	},
> +	.probe = truly_wqxga_probe,
> +	.remove = truly_wqxga_remove,
> +};
> +module_mipi_dsi_driver(truly_wqxga_driver);
> +
> +MODULE_DESCRIPTION("truly nt35597 DSI Panel Driver");

s/truly nt35597/Truly NT35597

The driver looks in good shape now. Thanks for working on it.

Regards,
Archit

> +MODULE_LICENSE("GPL v2");
> 
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