drm/vc4: hdmi: Move packet RAM enable to pm_runtime

Audio can be triggered by the HPD handler and start up before
video has been restored, calling vc4_hdmi_write_infoframe
for the audio infoframe.
vc4_hdmi_write_infoframe checks that the packet RAM to store
the infoframes is enabled, but that is only enabled when
video is enabled in vc4_hdmi_encoder_post_crtc_enable.

The packet RAM enable is only a power saving thing, so
move enabling/disabling to the runtime_pm hooks.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

Author: 6by9

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -846,7 +846,7 @@ static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
 
 	spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 
-	HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, 0);
+	HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, VC4_HDMI_RAM_PACKET_ENABLE);
 
 	HDMI_WRITE(HDMI_VID_CTL, HDMI_READ(HDMI_VID_CTL) | VC4_HD_VID_CTL_CLRRGB);
 
@@ -1620,9 +1620,6 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
 		WARN_ONCE(ret, "Timeout waiting for "
 			  "VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE\n");
 	} else {
-		HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
-			   HDMI_READ(HDMI_RAM_PACKET_CONFIG) &
-			   ~(VC4_HDMI_RAM_PACKET_ENABLE));
 		HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
 			   HDMI_READ(HDMI_SCHEDULER_CONTROL) &
 			   ~VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);
@@ -1641,9 +1638,6 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
 		WARN_ON(!(HDMI_READ(HDMI_SCHEDULER_CONTROL) &
 			  VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE));
 
-		HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
-			   VC4_HDMI_RAM_PACKET_ENABLE);
-
 		spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
 
 		drm_atomic_helper_connector_hdmi_update_infoframes(connector, state);
@@ -3104,6 +3098,12 @@ static int vc5_hdmi_init_resources(struct drm_device *drm,
 static int vc4_hdmi_runtime_suspend(struct device *dev)
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
+	HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, 0);
+	spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
+
 
 	clk_disable_unprepare(vc4_hdmi->audio_clock);
 	/* we no longer require a minimum clock rate */
@@ -3116,7 +3116,7 @@ static int vc4_hdmi_runtime_suspend(struct device *dev)
 static int vc4_hdmi_runtime_resume(struct device *dev)
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
-	unsigned long __maybe_unused flags;
+	unsigned long flags;
 	u32 __maybe_unused value;
 	unsigned long rate;
 	int ret;
@@ -3164,6 +3164,11 @@ static int vc4_hdmi_runtime_resume(struct device *dev)
 	}
 #endif
 
+	spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
+	HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
+		   VC4_HDMI_RAM_PACKET_ENABLE);
+	spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
+
 	return 0;
 
 err_disable_clk: