From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Sun, 16 Jul 2017 12:48:03 +0200
Subject: drm/vc4: prepare for CEC support
Git-commit: 10ee275cb12f884ce09bed69ea387eae73d7fece
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

In order to support CEC the hsm clock needs to be enabled in
vc4_hdmi_bind(), not in vc4_hdmi_encoder_enable(). Otherwise you wouldn't
be able to support CEC when there is no hotplug detect signal, which is
required by some monitors that turn off the HPD when in standby, but keep
the CEC bus alive so they can be woken up.

The HDMI core also has to be enabled in vc4_hdmi_bind() for the same
reason.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20170716104804.48308-3-hverkuil@xs4all.nl

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c |   59 ++++++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 30 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -463,11 +463,6 @@ static void vc4_hdmi_encoder_disable(str
 	HD_WRITE(VC4_HD_VID_CTL,
 		 HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
 
-	HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST);
-	udelay(1);
-	HD_WRITE(VC4_HD_M_CTL, 0);
-
-	clk_disable_unprepare(hdmi->hsm_clock);
 	clk_disable_unprepare(hdmi->pixel_clock);
 
 	ret = pm_runtime_put(&hdmi->pdev->dev);
@@ -509,16 +504,6 @@ static void vc4_hdmi_encoder_enable(stru
 		return;
 	}
 
-	/* This is the rate that is set by the firmware.  The number
-	 * needs to be a bit higher than the pixel clock rate
-	 * (generally 148.5Mhz).
-	 */
-	ret = clk_set_rate(hdmi->hsm_clock, 163682864);
-	if (ret) {
-		DRM_ERROR("Failed to set HSM clock rate: %d\n", ret);
-		return;
-	}
-
 	ret = clk_set_rate(hdmi->pixel_clock,
 			   mode->clock * 1000 *
 			   ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1));
@@ -533,20 +518,6 @@ static void vc4_hdmi_encoder_enable(stru
 		return;
 	}
 
-	ret = clk_prepare_enable(hdmi->hsm_clock);
-	if (ret) {
-		DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n",
-			  ret);
-		clk_disable_unprepare(hdmi->pixel_clock);
-		return;
-	}
-
-	HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST);
-	udelay(1);
-	HD_WRITE(VC4_HD_M_CTL, 0);
-
-	HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_ENABLE);
-
 	HDMI_WRITE(VC4_HDMI_SW_RESET_CONTROL,
 		   VC4_HDMI_SW_RESET_HDMI |
 		   VC4_HDMI_SW_RESET_FORMAT_DETECT);
@@ -1205,6 +1176,23 @@ static int vc4_hdmi_bind(struct device *
 		return -EPROBE_DEFER;
 	}
 
+	/* This is the rate that is set by the firmware.  The number
+	 * needs to be a bit higher than the pixel clock rate
+	 * (generally 148.5Mhz).
+	 */
+	ret = clk_set_rate(hdmi->hsm_clock, 163682864);
+	if (ret) {
+		DRM_ERROR("Failed to set HSM clock rate: %d\n", ret);
+		goto err_put_i2c;
+	}
+
+	ret = clk_prepare_enable(hdmi->hsm_clock);
+	if (ret) {
+		DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n",
+			  ret);
+		goto err_put_i2c;
+	}
+
 	/* Only use the GPIO HPD pin if present in the DT, otherwise
 	 * we'll use the HDMI core's register.
 	 */
@@ -1216,7 +1204,7 @@ static int vc4_hdmi_bind(struct device *
 							 &hpd_gpio_flags);
 		if (hdmi->hpd_gpio < 0) {
 			ret = hdmi->hpd_gpio;
-			goto err_put_i2c;
+			goto err_unprepare_hsm;
 		}
 
 		hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW;
@@ -1224,6 +1212,14 @@ static int vc4_hdmi_bind(struct device *
 
 	vc4->hdmi = hdmi;
 
+	/* HDMI core must be enabled. */
+	if (!(HD_READ(VC4_HD_M_CTL) & VC4_HD_M_ENABLE)) {
+		HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST);
+		udelay(1);
+		HD_WRITE(VC4_HD_M_CTL, 0);
+
+		HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_ENABLE);
+	}
 	pm_runtime_enable(dev);
 
 	drm_encoder_init(drm, hdmi->encoder, &vc4_hdmi_encoder_funcs,
@@ -1244,6 +1240,8 @@ static int vc4_hdmi_bind(struct device *
 
 err_destroy_encoder:
 	vc4_hdmi_encoder_destroy(hdmi->encoder);
+err_unprepare_hsm:
+	clk_disable_unprepare(hdmi->hsm_clock);
 	pm_runtime_disable(dev);
 err_put_i2c:
 	put_device(&hdmi->ddc->dev);
@@ -1263,6 +1261,7 @@ static void vc4_hdmi_unbind(struct devic
 	vc4_hdmi_connector_destroy(hdmi->connector);
 	vc4_hdmi_encoder_destroy(hdmi->encoder);
 
+	clk_disable_unprepare(hdmi->hsm_clock);
 	pm_runtime_disable(dev);
 
 	put_device(&hdmi->ddc->dev);