linux-kernel - [PATCH v3 12/14] drm: bridge/analogix_dp: expand the delay time for hpd detect

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Date:	Wed, 19 Aug 2015 09:52:09 -0500
From:	Yakir Yang <ykk@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>,
	Thierry Reding <treding@...dia.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Inki Dae <inki.dae@...sung.com>, joe@...ches.com,
	Russell King <rmk+kernel@....linux.org.uk>
Cc:	djkurtz@...gle.com, dianders@...gle.com, seanpaul@...gle.com,
	Takashi Iwai <tiwai@...e.de>, ajaynumb@...il.com,
	Andrzej Hajda <a.hajda@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	David Airlie <airlied@...ux.ie>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Vincent Palatin <vpalatin@...omium.org>,
	Mark Yao <mark.yao@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Kishon Vijay Abraham I <kishon@...com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Yakir Yang <ykk@...k-chips.com>
Subject: [PATCH v3 12/14] drm: bridge/analogix_dp: expand the delay time for hpd detect

Some edp screen with no hpd signal would need some delay time
to ensure that screen would be ready for work, so we can expand
the delay time in hpd detect function, it works prefectly on my
rk3288 sdk board.

Signed-off-by: Yakir Yang <ykk@...k-chips.com>
---
Changes in v3: None
Changes in v2: None

 drivers/gpu/drm/bridge/analogix_dp_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix_dp_core.c
index 99870f7..75dd44a 100644
--- a/drivers/gpu/drm/bridge/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix_dp_core.c
@@ -68,7 +68,7 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
 			return 0;
 
 		timeout_loop++;
-		usleep_range(10, 11);
+		usleep_range(100, 110);
 	}
 
 	/*
-- 
1.9.1


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