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

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Message-ID: <10778402.NyiUUSuA9g@senjougahara>
Date: Fri, 18 Jul 2025 18:15:08 +0900
From: Mikko Perttunen <mperttunen@...dia.com>
To: 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>,
 Svyatoslav Ryhel <clamor95@...il.com>, Dmitry Osipenko <digetx@...il.com>,
 Svyatoslav Ryhel <clamor95@...il.com>
Cc: 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

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.

Thanks,
Mikko