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

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Date:   Tue, 7 Mar 2023 12:13:25 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     neil.armstrong@...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



On 7.03.2023 10:19, Neil Armstrong wrote:
> 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() ?
Sure!

Recent-ish panels only talk BE brightness data, very cool that
somebody made a wrapper for this!

Konrad
> 
>> +
>> +    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