linux-kernel - Re: [PATCH v5 10/12] drm: renesas: rz-du: mipi_dsi: Add dphy_late

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Message-ID: <CA+V-a8sxHiddge_U7SLr6jBdjVvDFCzqsr6mgZBCoyVsjo9Uxg@mail.gmail.com>
Date: Wed, 21 May 2025 14:10:24 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Biju Das <biju.das.jz@...renesas.com>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Magnus Damm <magnus.damm@...il.com>, dri-devel@...ts.freedesktop.org, 
	linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v5 10/12] drm: renesas: rz-du: mipi_dsi: Add
 dphy_late_init() callback for RZ/V2H(P)

Hi Laurent,

Thank you for the review.

On Tue, May 20, 2025 at 3:28 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Prabhakar,
>
> Thank you for the patch.
>
> On Mon, May 12, 2025 at 07:23:28PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Introduce the `dphy_late_init` callback in `rzg2l_mipi_dsi_hw_info` to
> > allow additional D-PHY register configurations after enabling data and
> > clock lanes. This is required for the RZ/V2H(P) SoC but not for the
> > RZ/G2L SoC.
> >
> > Modify `rzg2l_mipi_dsi_startup()` to invoke `dphy_late_init` if defined,
> > ensuring SoC-specific initialization is performed only when necessary.
> >
> > This change prepares for RZ/V2H(P) SoC support while maintaining
> > compatibility with existing platforms.
> >
> > Co-developed-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> > v4->v5:
> > - Added Reviewed tag from Biju
> >
> > v3->v4:
> > - No changes
> >
> > v2->v3:
> > - No changes
> >
> > v1->v2:
> > - No changes
> > ---
> >  drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> > index 55a1c1b043c8..e1ce21a9ddb3 100644
> > --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> > +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> > @@ -34,6 +34,7 @@ struct rzg2l_mipi_dsi;
> >
> >  struct rzg2l_mipi_dsi_hw_info {
> >       int (*dphy_init)(struct rzg2l_mipi_dsi *dsi, u64 hsfreq_millihz);
> > +     void (*dphy_late_init)(struct rzg2l_mipi_dsi *dsi);
>
> As this is called at startup time I would have called it dphy_startup.
> Up to you.
>
Agreed, I will rename this to dphy_startup_late_init().

Cheers,
Prabhakar

> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
>
> >       void (*dphy_exit)(struct rzg2l_mipi_dsi *dsi);
> >       u32 phy_reg_offset;
> >       u32 link_reg_offset;
> > @@ -320,6 +321,9 @@ static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi,
> >       txsetr = TXSETR_DLEN | TXSETR_NUMLANEUSE(dsi->lanes - 1) | TXSETR_CLEN;
> >       rzg2l_mipi_dsi_link_write(dsi, TXSETR, txsetr);
> >
> > +     if (dsi->info->dphy_late_init)
> > +             dsi->info->dphy_late_init(dsi);
> > +
> >       hsfreq = DIV_ROUND_CLOSEST_ULL(hsfreq_millihz, MILLI);
> >       /*
> >        * Global timings characteristic depends on high speed Clock Frequency
>
> --
> Regards,
>
> Laurent Pinchart