From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Wed, 2 Aug 2017 10:54:00 +0200
Subject: omapdrm: encoder-tpd12s015: keep ls_oe_gpio high
Git-commit: 3b86b9ec21031aeaa8a9c2634299c1aa5c686bfd
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

For OMAP4 CEC support the CEC pin should always be on. So keep
ls_oe_gpio high all the time in order to support CEC.

Background: even if the HPD is low it should still be possible
to use CEC. Some displays will set the HPD low when they go into standby or
when they switch to another input, but CEC is still available and able
to wake up/change input for such a display.

This is explicitly allowed by the CEC standard.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
+++ b/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
@@ -51,6 +51,8 @@ static int tpd_connect(struct omap_dss_d
 	dssdev->dst = dst;
 
 	gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
+	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
+
 	/* DC-DC converter needs at max 300us to get to 90% of 5V */
 	udelay(300);
 
@@ -69,6 +71,7 @@ static void tpd_disconnect(struct omap_d
 		return;
 
 	gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
+	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
 
 	dst->src = NULL;
 	dssdev->dst = NULL;
@@ -146,18 +149,11 @@ static int tpd_read_edid(struct omap_dss
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 	struct omap_dss_device *in = ddata->in;
-	int r;
 
 	if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
 		return -ENODEV;
 
-	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
-
-	r = in->ops.hdmi->read_edid(in, edid, len);
-
-	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
-
-	return r;
+	return in->ops.hdmi->read_edid(in, edid, len);
 }
 
 static bool tpd_detect(struct omap_dss_device *dssdev)