[PATCH v4 16/38] drm/bridge: analogix_dp: Extend hpd check time to 100ms

Enric Balletbo i Serra enric.balletbo at collabora.com
Mon Mar 5 14:23:08 PST 2018

From: Lin Huang <hl at 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 at chromium.org>
Cc: 征增 王 <wzz at rock-chips.com>
Signed-off-by: Lin Huang <hl at rock-chips.com>
Signed-off-by: Sean Paul <seanpaul at chromium.org>
Signed-off-by: Thierry Escande <thierry.escande at collabora.com>
Reviewed-by: Andrzej Hajda <a.hajda at samsung.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo at collabora.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 9b7d530ad24c..0ff151f741a3 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;
-		usleep_range(10, 11);
+		usleep_range(1000, 1100);

More information about the Linux-rockchip mailing list