linux-kernel - [PATCH v3 4/7] phy: rockchip: phy-rockchip-inno-csidphy: allow writes to grf register 0

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Message-Id: <20250616-rk3588-csi-dphy-v3-4-a5ccd5f1f438@collabora.com>
Date: Mon, 01 Sep 2025 22:47:45 +0200
From: Michael Riesch via B4 Relay <devnull+michael.riesch.collabora.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, 
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Kever Yang <kever.yang@...k-chips.com>, 
 Jagan Teki <jagan@...rulasolutions.com>, 
 Sebastian Reichel <sebastian.reichel@...labora.com>, 
 Diederik de Haas <didi.debian@...ow.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Heiko Stuebner <heiko@...ech.de>, 
 Collabora Kernel Team <kernel@...labora.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-phy@...ts.infradead.org, 
 Michael Riesch <michael.riesch@...labora.com>
Subject: [PATCH v3 4/7] phy: rockchip: phy-rockchip-inno-csidphy: allow
 writes to grf register 0

From: Michael Riesch <michael.riesch@...labora.com>

The driver for the Rockchip MIPI CSI-2 DPHY uses GRF register offset
value 0 to sort out undefined registers. However, the RK3588 CSIDPHY GRF
this offset is perfectly fine (in fact, register 0 is the only one in
this register file).
Introduce a boolean variable to indicate valid registers and allow writes
to register 0.

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Signed-off-by: Michael Riesch <michael.riesch@...labora.com>
---
 drivers/phy/rockchip/phy-rockchip-inno-csidphy.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c b/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c
index 2ab99e1d47eb..75533d071025 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c
@@ -87,10 +87,11 @@ struct dphy_reg {
 	u32 offset;
 	u32 mask;
 	u32 shift;
+	u8 valid;
 };
 
 #define PHY_REG(_offset, _width, _shift) \
-	{ .offset = _offset, .mask = BIT(_width) - 1, .shift = _shift, }
+	{ .offset = _offset, .mask = BIT(_width) - 1, .shift = _shift, .valid = 1, }
 
 static const struct dphy_reg rk1808_grf_dphy_regs[] = {
 	[GRF_DPHY_CSIPHY_FORCERXMODE] = PHY_REG(RK1808_GRF_PD_VI_CON_OFFSET, 4, 0),
@@ -145,7 +146,7 @@ static inline void write_grf_reg(struct rockchip_inno_csidphy *priv,
 	const struct dphy_drv_data *drv_data = priv->drv_data;
 	const struct dphy_reg *reg = &drv_data->grf_regs[index];
 
-	if (reg->offset)
+	if (reg->valid)
 		regmap_write(priv->grf, reg->offset,
 			     HIWORD_UPDATE(value, reg->mask, reg->shift));
 }

-- 
2.39.5