linux-kernel - Re: [PATCH 3/3] drm/panel: Add Novatek NT36532 panel driver

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Message-ID: <2do3dk7gqvbloocsv46t3zrc4ghvhrpiqre6djk6heese3wz75@dlqwkdsnrkbr>
Date: Mon, 6 Oct 2025 13:39:21 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Junjie Cao <caojunjie650@...il.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Antonino Maniscalco <antomani103@...il.com>,
        Jonathan Marek <jonathan@...ek.ca>, Eugene Lepshy <fekz115@...il.com>,
        Jun Nie <jun.nie@...aro.org>, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 3/3] drm/panel: Add Novatek NT36532 panel driver

On Mon, Oct 06, 2025 at 12:10:05PM +0200, Konrad Dybcio wrote:
> On 10/6/25 12:02 PM, Dmitry Baryshkov wrote:
> > On Mon, Oct 06, 2025 at 11:24:35AM +0200, Konrad Dybcio wrote:
> >> On 10/2/25 4:04 AM, Dmitry Baryshkov wrote:
> >>> On Wed, Oct 01, 2025 at 09:59:14PM +0800, Junjie Cao wrote:
> >>>> Add a driver for panels using the Novatek NT36532 Display Driver IC,
> >>>> including support for the CSOT PPC100HB1-1, found in the OnePlus Pad 2
> >>>> tablets.
> >>>>
> >>>> Signed-off-by: Junjie Cao <caojunjie650@...il.com>
> >>>> ---
> >>>>  MAINTAINERS                                   |   7 +
> >>>>  drivers/gpu/drm/panel/Kconfig                 |  10 +
> >>>>  drivers/gpu/drm/panel/Makefile                |   1 +
> >>>>  drivers/gpu/drm/panel/panel-novatek-nt36532.c | 437 ++++++++++++++++++
> >>>>  4 files changed, 455 insertions(+)
> >>>>  create mode 100644 drivers/gpu/drm/panel/panel-novatek-nt36532.c
> >>>>
> >>>> +
> >>>> +static const struct panel_info csot_panel_info = {
> >>>> +	.width_mm = 250,
> >>>> +	.height_mm = 177,
> >>>> +	.lanes = 4,
> >>>> +	.format = MIPI_DSI_FMT_RGB888,
> >>>> +	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_CLOCK_NON_CONTINUOUS |
> >>>> +		      MIPI_DSI_MODE_LPM,
> >>>> +	.display_mode = csot_display_mode,
> >>>> +	.dsc_slice_per_pkt = 2,
> >>>
> >>> As this is not a part of the standard, what if the DSI host doesn't
> >>> support this feature?
> >>
> >> Shouldn't the core gracefully throw something like an -EINVAL?
> > 
> > There is no 'core' here. Each DSI DRM host manages DSC on their own.
> 
> drm_dsc_helper?

No, that's just for calculating PPS and some other values. It's one of
the problems of the DSI model, which I tried to solve a year ago, but
failed up to now to do it completely and clearly. The DSI device can't
check host's capabilities. It declares what it needs inside struct
mipi_dsi_device and hopes for the best.

-- 
With best wishes
Dmitry