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From:   Thierry Escande <thierry.escande@collabora.com>
To:     Archit Taneja <architt@codeaurora.org>,
        Inki Dae <inki.dae@samsung.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Sandy Huang <hjc@rock-chips.com>,
        Sean Paul <seanpaul@chromium.org>,
        David Airlie <airlied@linux.ie>,
        Tomasz Figa <tfiga@chromium.org>
Cc:     Haixia Shi <hshi@chromium.org>,
        =?UTF-8?q?=C3=98rjan=20Eide?= <orjan.eide@arm.com>,
        Zain Wang <wzz@rock-chips.com>,
        Yakir Yang <ykk@rock-chips.com>, Lin Huang <hl@rock-chips.com>,
        Douglas Anderson <dianders@chromium.org>,
        Mark Yao <mark.yao@rock-chips.com>,
        linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
        dri-devel@lists.freedesktop.org
Subject: [PATCH v2 20/43] drm/bridge: analogix_dp: Extend hpd check time to 100ms
Date:   Fri, 26 Jan 2018 14:16:47 +0100
Message-Id: <20180126131710.7622-21-thierry.escande@collabora.com>
In-Reply-To: <20180126131710.7622-1-thierry.escande@collabora.com>
References: <20180126131710.7622-1-thierry.escande@collabora.com>
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From: Lin Huang <hl@rock-chips.com>

There was a 1ms delay to detect the hpd signal, which is too short to
detect a short pulse. This patch extends this delay to 100ms.

Cc: Stéphane Marchesin <marcheu@chromium.org>
Cc: 征增 王 <wzz@rock-chips.com>
Signed-off-by: Lin Huang <hl@rock-chips.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index fa4ef28e286f..9df92dc54dbe 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -76,7 +76,7 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
 			return 0;
 
 		timeout_loop++;
-		usleep_range(10, 11);
+		usleep_range(1000, 1100);
 	}
 
 	/*
-- 
2.14.1