openwrt/target/linux/bcm27xx/patches-5.10/950-0684-drm-vc4-hdmi-Don-t-poll-for-the-infoframes-status-on.patch

From 643f9b3a9e48fb2378d3dde8cfef452f7628e295 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Thu, 3 Dec 2020 08:46:24 +0100
Subject: [PATCH] drm/vc4: hdmi: Don't poll for the infoframes status
 on setup

The infoframes are sent at a regular interval as a data island packet,
so we don't need to wait for them to be sent when we're setting them up.

However, we do need to poll when we're enabling since the we can't
update the packet RAM until it has been sent.

Let's add a boolean flag to tell whether we want to poll or not to
support both cases.

Suggested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201203074624.721559-1-maxime@cerno.tech
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -363,7 +363,8 @@ static int vc4_hdmi_connector_init(struc
 }
 
 static int vc4_hdmi_stop_packet(struct drm_encoder *encoder,
-				enum hdmi_infoframe_type type)
+				enum hdmi_infoframe_type type,
+				bool poll)
 {
 	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 	u32 packet_id = type - 0x80;
@@ -371,6 +372,9 @@ static int vc4_hdmi_stop_packet(struct d
 	HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
 		   HDMI_READ(HDMI_RAM_PACKET_CONFIG) & ~BIT(packet_id));
 
+	if (!poll)
+		return 0;
+
 	return wait_for(!(HDMI_READ(HDMI_RAM_PACKET_STATUS) &
 			  BIT(packet_id)), 100);
 }
@@ -399,7 +403,7 @@ static void vc4_hdmi_write_infoframe(str
 	if (len < 0)
 		return;
 
-	ret = vc4_hdmi_stop_packet(encoder, frame->any.type);
+	ret = vc4_hdmi_stop_packet(encoder, frame->any.type, true);
 	if (ret) {
 		DRM_ERROR("Failed to wait for infoframe to go idle: %d\n", ret);
 		return;
@@ -1283,7 +1287,7 @@ static void vc4_hdmi_audio_reset(struct
 	int ret;
 
 	vc4_hdmi->audio.streaming = false;
-	ret = vc4_hdmi_stop_packet(encoder, HDMI_INFOFRAME_TYPE_AUDIO);
+	ret = vc4_hdmi_stop_packet(encoder, HDMI_INFOFRAME_TYPE_AUDIO, false);
 	if (ret)
 		dev_err(dev, "Failed to stop audio infoframe: %d\n", ret);