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From: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
To: Andrzej Hajda <andrzej.hajda@intel.com>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Robert Foss <rfoss@kernel.org>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Luca Ceresoli <luca.ceresoli@bootlin.com>,
	David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, Vinod Koul <vkoul@kernel.org>
Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Mohit Dsor <mohit.dsor@oss.qualcomm.com>,
	boss@oss.qualcomm.com, qc-display-maintainer@oss.qualcomm.com
Subject: [PATCH 2/4] drm/bridge: lontium-lt9611c: Increase MCU poll timeout to 200ms
Date: Thu, 11 Jun 2026 02:44:57 +0530	[thread overview]
Message-ID: <20260611-lt9611-b4-send-v1-2-42abbcd3bb1e@oss.qualcomm.com> (raw)
In-Reply-To: <20260611-lt9611-b4-send-v1-0-42abbcd3bb1e@oss.qualcomm.com>

The on-chip MCU may take longer than 100ms to respond on some hardware
variants or slower I2C buses, causing spurious -ETIMEDOUT errors during
normal operation. Double the poll timeout from 100ms to 200ms to improve
reliability without changing the poll interval.

Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
---
 drivers/gpu/drm/bridge/lontium-lt9611c.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611c.c b/drivers/gpu/drm/bridge/lontium-lt9611c.c
index cb584855fd8f..b0402726367e 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611c.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611c.c
@@ -97,7 +97,7 @@ static int lt9611c_read_write_flow(struct lt9611c *lt9611c, u8 *params,
 	regmap_write(lt9611c->regmap, 0xe0de, 0x01);
 
 	ret = regmap_read_poll_timeout(lt9611c->regmap, 0xe0ae, temp,
-				       temp == 0x01, 1000, 100 * 1000);
+				       temp == 0x01, 1000, 200 * 1000);
 	if (ret)
 		return -ETIMEDOUT;
 
@@ -107,7 +107,7 @@ static int lt9611c_read_write_flow(struct lt9611c *lt9611c, u8 *params,
 	regmap_write(lt9611c->regmap, 0xe0de, 0x02);
 
 	ret = regmap_read_poll_timeout(lt9611c->regmap, 0xe0ae, temp,
-				       temp == 0x02, 1000, 100 * 1000);
+				       temp == 0x02, 1000, 200 * 1000);
 	if (ret)
 		return -ETIMEDOUT;
 

-- 
2.34.1


  parent reply	other threads:[~2026-06-10 21:15 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-10 21:14 [PATCH 0/4] (no cover subject) Mohit Dsor
2026-06-10 21:14 ` [PATCH 1/4] dt-bindings: brige: lt9611c: add port-select property for LT9611C Mohit Dsor
2026-06-11 10:40   ` Krzysztof Kozlowski
2026-06-22 12:01     ` Mohit Dsor
2026-06-22 12:08       ` Laurent Pinchart
2026-06-22 13:16         ` Krzysztof Kozlowski
2026-06-10 21:14 ` Mohit Dsor [this message]
2026-06-26 20:25   ` [PATCH 2/4] drm/bridge: lontium-lt9611c: Increase MCU poll timeout to 200ms Dmitry Baryshkov
2026-07-03 12:33     ` Mohit Dsor
2026-06-10 21:14 ` [PATCH 3/4] drm-bridge: lontium lt9611c: fixes and improvements Mohit Dsor
2026-06-12  9:26   ` Luca Ceresoli
2026-06-22 12:08     ` Mohit Dsor
2026-06-26 16:11       ` Luca Ceresoli
2026-06-26 20:30   ` Dmitry Baryshkov
2026-07-03 12:57     ` Mohit Dsor
2026-06-10 21:14 ` [PATCH 4/4] drm/bridge: lontium-lt9611c: Add DSI port selection via DT property Mohit Dsor
2026-06-26 20:24   ` Dmitry Baryshkov
2026-06-26 20:32 ` [PATCH 0/4] (no cover subject) Dmitry Baryshkov

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