linux-kernel - [PATCH v3 01/10] drm/rcar-du: dsi: Fix PHY lock bit check

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Message-Id: <20241206-rcar-gh-dsi-v3-1-d74c2166fa15@ideasonboard.com>
Date: Fri, 06 Dec 2024 11:32:34 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Kieran Bingham <kieran.bingham+renesas@...asonboard.com>, 
 Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 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>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Magnus Damm <magnus.damm@...il.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, LUU HOAI <hoai.luu.ub@...esas.com>, 
 Jagan Teki <jagan@...rulasolutions.com>, Sam Ravnborg <sam@...nborg.org>, 
 Biju Das <biju.das.jz@...renesas.com>
Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>, 
 linux-clk@...r.kernel.org, 
 Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>, 
 stable@...r.kernel.org
Subject: [PATCH v3 01/10] drm/rcar-du: dsi: Fix PHY lock bit check

From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>

The driver checks for bit 16 (using CLOCKSET1_LOCK define) in CLOCKSET1
register when waiting for the PPI clock. However, the right bit to check
is bit 17 (CLOCKSET1_LOCK_PHY define). Not only that, but there's
nothing in the documents for bit 16 for V3U nor V4H.

So, fix the check to use bit 17, and drop the define for bit 16.

Fixes: 155358310f01 ("drm: rcar-du: Add R-Car DSI driver")
Fixes: 11696c5e8924 ("drm: Place Renesas drivers in a separate dir")
Cc: stable@...r.kernel.org
Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c      | 2 +-
 drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
index 2dba7c5ffd2c..92f4261305bd 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
@@ -587,7 +587,7 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
 	for (timeout = 10; timeout > 0; --timeout) {
 		if ((rcar_mipi_dsi_read(dsi, PPICLSR) & PPICLSR_STPST) &&
 		    (rcar_mipi_dsi_read(dsi, PPIDLSR) & PPIDLSR_STPST) &&
-		    (rcar_mipi_dsi_read(dsi, CLOCKSET1) & CLOCKSET1_LOCK))
+		    (rcar_mipi_dsi_read(dsi, CLOCKSET1) & CLOCKSET1_LOCK_PHY))
 			break;
 
 		usleep_range(1000, 2000);
diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
index f8114d11f2d1..a6b276f1d6ee 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
@@ -142,7 +142,6 @@
 
 #define CLOCKSET1			0x101c
 #define CLOCKSET1_LOCK_PHY		(1 << 17)
-#define CLOCKSET1_LOCK			(1 << 16)
 #define CLOCKSET1_CLKSEL		(1 << 8)
 #define CLOCKSET1_CLKINSEL_EXTAL	(0 << 2)
 #define CLOCKSET1_CLKINSEL_DIG		(1 << 2)

-- 
2.43.0