linux-kernel - [RFC PATCH 1/7] drm: bridge: Enable polling hpd event in dw

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Message-Id: <20170920193831.20268-2-jernej.skrabec@siol.net>
Date:   Wed, 20 Sep 2017 21:38:25 +0200
From:   Jernej Skrabec <jernej.skrabec@...l.net>
To:     maxime.ripard@...e-electrons.com, wens@...e.org
Cc:     Laurent.pinchart@...asonboard.com, narmstrong@...libre.com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, icenowy@...c.io,
        linux-sunxi@...glegroups.com
Subject: [RFC PATCH 1/7] drm: bridge: Enable polling hpd event in dw_hdmi

Some custom phys don't support hpd interrupts. Add support for polling
such events.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index bf14214fa464..09cb5a3e4c71 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1954,7 +1954,11 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
 	struct drm_connector *connector = &hdmi->connector;
 
 	connector->interlace_allowed = 1;
-	connector->polled = DRM_CONNECTOR_POLL_HPD;
+	if (hdmi->phy.ops->setup_hpd)
+		connector->polled = DRM_CONNECTOR_POLL_HPD;
+	else
+		connector->polled = DRM_CONNECTOR_POLL_CONNECT |
+				    DRM_CONNECTOR_POLL_DISCONNECT;
 
 	drm_connector_helper_add(connector, &dw_hdmi_connector_helper_funcs);
 
-- 
2.14.1