linux-kernel - [PATCH 09/12] drm/bridge: samsung-dsim: increase timeout value for PLL

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Message-Id: <20250612-exynos7870-dsim-v1-9-1a330bca89df@disroot.org>
Date: Thu, 12 Jun 2025 20:48:13 +0530
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Inki Dae <inki.dae@...sung.com>, 
 Jagan Teki <jagan@...rulasolutions.com>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 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>, 
 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>, Seung-Woo Kim <sw0312.kim@...sung.com>, 
 Kyungmin Park <kyungmin.park@...sung.com>, 
 Krzysztof Kozlowski <krzk@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, 
 Kaustabh Chakraborty <kauschluss@...root.org>
Subject: [PATCH 09/12] drm/bridge: samsung-dsim: increase timeout value for
 PLL_STABLE

Exynos7870's DSIM requires more time to stabilize its PLL. The current
timeout value, 1000, doesn't suffice. Increase the value to 3000, which
is just about enough as observed experimentally.

Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
 drivers/gpu/drm/bridge/samsung-dsim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index 5787746c63035a94c0b8b7497df61bb1e69656cd..50dcdb9b81f68098936fbb3f121a0010b11cd8dd 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -751,7 +751,7 @@ static unsigned long samsung_dsim_set_pll(struct samsung_dsim *dsi,
 
 	samsung_dsim_write(dsi, DSIM_PLLCTRL_REG, reg);
 
-	timeout = 1000;
+	timeout = 3000;
 	do {
 		if (timeout-- == 0) {
 			dev_err(dsi->dev, "PLL failed to stabilize\n");

-- 
2.49.0