linux-kernel - Re: [PATCH 2/2] gpu/drm/panel: Add Lenovo NT36523W BOE panel

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Date:   Tue, 7 Mar 2023 10:19:50 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] gpu/drm/panel: Add Lenovo NT36523W BOE panel

Hi,

On 17/02/2023 12:29, Konrad Dybcio wrote:
> Introduce support for the BOE panel with a NT36523W touch/driver IC
> found on some Lenovo Tab P11 devices. It's a 2000x1200, 24bit RGB
> MIPI DSI panel with integrated DCS-controlled backlight (that expects
> big-endian communication).
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>   drivers/gpu/drm/panel/Kconfig                     |  12 +
>   drivers/gpu/drm/panel/Makefile                    |   1 +
>   drivers/gpu/drm/panel/panel-lenovo-nt36523w-boe.c | 751 ++++++++++++++++++++++
>   3 files changed, 764 insertions(+)
> 

<snip>

> diff --git a/drivers/gpu/drm/panel/panel-lenovo-nt36523w-boe.c b/drivers/gpu/drm/panel/panel-lenovo-nt36523w-boe.c
> new file mode 100644
> index 000000000000..83478e471493
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-lenovo-nt36523w-boe.c
> @@ -0,0 +1,751 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2023 Linaro Limited
> + *
> + * Generated with linux-mdss-dsi-panel-driver-generator with
> + * some manual adjustments.
> + */

<snip>

> +static int nt36523w_boe_bl_update_status(struct backlight_device *bl)
> +{
> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
> +	u16 brightness = backlight_get_brightness(bl);
> +	int ret;
> +
> +	brightness = cpu_to_be16(brightness);
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
> +	if (ret < 0)
> +		return ret;

It's not wrong as is, but could you switch to mipi_dsi_dcs_set_display_brightness_large() ?

> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	return 0;
> +}
> +
> +static int nt36523w_boe_bl_get_brightness(struct backlight_device *bl)
> +{
> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
> +	u16 brightness;
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);

And here to  mipi_dsi_dcs_get_display_brightness_large() ?
> +	if (ret < 0)
> +		return ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	brightness = be16_to_cpu(brightness);
> +
> +	return brightness;
> +}
> +
Please send a v2 with those changes and keep my reviewed-by

Thanks!
Neil