linux-kernel - [PATCH v3 12/15] drm: renesas: rz-du: mipi_dsi: Add dphy_late

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Message-ID: <20250418184658.456398-13-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 18 Apr 2025 19:46:55 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.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>,
	Biju Das <biju.das.jz@...renesas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Magnus Damm <magnus.damm@...il.com>
Cc: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v3 12/15] drm: renesas: rz-du: mipi_dsi: Add dphy_late_init() callback for RZ/V2H(P)

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>
---
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 36b8ef95f20b..c3bd3b21dd15 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
@@ -35,6 +35,7 @@ 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);
 	void (*dphy_exit)(struct rzg2l_mipi_dsi *dsi);
 	u32 phy_reg_offset;
 	u32 link_reg_offset;
@@ -318,6 +319,9 @@ 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, KILO);
 	/*
 	 * Global timings characteristic depends on high speed Clock Frequency
-- 
2.49.0