linux-kernel - Re: [PATCH v1 4/5] gpu/drm: tegra: dsi: add support for Tegra20/Tegra30

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Message-ID: <CAPVz0n1u3=UcYvbZEfC59kMLD647pJKKiOQ308oQ9qde4vQcyQ@mail.gmail.com>
Date: Fri, 18 Jul 2025 12:19:24 +0300
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Mikko Perttunen <mperttunen@...dia.com>
Cc: 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>, 
	Thierry Reding <thierry.reding@...il.com>, Thierry Reding <treding@...dia.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, Peter De Schrijver <pdeschrijver@...dia.com>, 
	Prashant Gaikwad <pgaikwad@...dia.com>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Dmitry Osipenko <digetx@...il.com>, dri-devel@...ts.freedesktop.org, 
	devicetree@...r.kernel.org, linux-tegra@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v1 4/5] gpu/drm: tegra: dsi: add support for Tegra20/Tegra30

пт, 18 лип. 2025 р. о 12:15 Mikko Perttunen <mperttunen@...dia.com> пише:
>
> On Thursday, July 17, 2025 11:21 PM Svyatoslav Ryhel wrote:
> > Tegra20/Tegra30 are fully compatible with existing tegra DSI driver apart
>
> 'apart from'
>
> > clock configuration and MIPI calibration which are addressed by this patch.
> >
> > Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> > ---
> >  drivers/gpu/drm/tegra/drm.c |  2 ++
> >  drivers/gpu/drm/tegra/dsi.c | 69 ++++++++++++++++++++++---------------
> >  drivers/gpu/drm/tegra/dsi.h | 10 ++++++
> >  3 files changed, 54 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> > index 4596073fe28f..5d64cd57e764 100644
> > --- a/drivers/gpu/drm/tegra/drm.c
> > +++ b/drivers/gpu/drm/tegra/drm.c
> > @@ -1359,10 +1359,12 @@ static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops,
> > host1x_drm_suspend,
> >
> >  static const struct of_device_id host1x_drm_subdevs[] = {
> >       { .compatible = "nvidia,tegra20-dc", },
> > +     { .compatible = "nvidia,tegra20-dsi", },
> >       { .compatible = "nvidia,tegra20-hdmi", },
> >       { .compatible = "nvidia,tegra20-gr2d", },
> >       { .compatible = "nvidia,tegra20-gr3d", },
> >       { .compatible = "nvidia,tegra30-dc", },
> > +     { .compatible = "nvidia,tegra30-dsi", },
> >       { .compatible = "nvidia,tegra30-hdmi", },
> >       { .compatible = "nvidia,tegra30-gr2d", },
> >       { .compatible = "nvidia,tegra30-gr3d", },
> > diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
> > index 3f91a24ebef2..85bcb8bee1ae 100644
> > --- a/drivers/gpu/drm/tegra/dsi.c
> > +++ b/drivers/gpu/drm/tegra/dsi.c
> > @@ -662,39 +662,48 @@ static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
> > {
> >       u32 value;
> >
> > -     value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
> > -     tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
> > +     /* Tegra20/30 uses DSIv0 while Tegra114+ uses DSIv1 */
> > +     if (of_device_is_compatible(dsi->dev->of_node, "nvidia,tegra20-dsi")
> ||
> > +         of_device_is_compatible(dsi->dev->of_node, "nvidia,tegra30-dsi"))
>
> You need to add "soc data" structures to the of_match table instead of
> checking for compatible string in the code itself.
>

I assumed that introducing "soc data" for 2 occurrences would be excessive.

> Thanks,
> Mikko
>
>
>
>