diff mbox series

[v2,07/31] drm/vc4: hdmi: Increase audio MAI fifo dreq threshold

Message ID 20240621152055.4180873-8-dave.stevenson@raspberrypi.com (mailing list archive)
State New, archived
Headers show
Series Preparatory patches for BCM2712 (Pi5) support | expand

Commit Message

Dave Stevenson June 21, 2024, 3:20 p.m. UTC 
From: Dom Cobley <popcornmix@gmail.com>

Now we wait for write responses and have a burst
size of 4, we can set the fifo threshold much higher.

Set it to 28 (of the 32 entry size) to keep fifo
fuller and reduce chance of underflow.

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 04d32dc3e98c..ad88915306f1 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -2041,6 +2041,7 @@  static int vc4_hdmi_audio_prepare(struct device *dev, void *data,
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
 	struct drm_device *drm = vc4_hdmi->connector.dev;
 	struct drm_connector *connector = &vc4_hdmi->connector;
+	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	unsigned int sample_rate = params->sample_rate;
 	unsigned int channels = params->channels;
 	unsigned long flags;
@@ -2098,11 +2099,18 @@  static int vc4_hdmi_audio_prepare(struct device *dev, void *data,
 					     VC4_HDMI_AUDIO_PACKET_CEA_MASK);
 
 	/* Set the MAI threshold */
-	HDMI_WRITE(HDMI_MAI_THR,
-		   VC4_SET_FIELD(0x08, VC4_HD_MAI_THR_PANICHIGH) |
-		   VC4_SET_FIELD(0x08, VC4_HD_MAI_THR_PANICLOW) |
-		   VC4_SET_FIELD(0x06, VC4_HD_MAI_THR_DREQHIGH) |
-		   VC4_SET_FIELD(0x08, VC4_HD_MAI_THR_DREQLOW));
+	if (vc4->is_vc5)
+		HDMI_WRITE(HDMI_MAI_THR,
+			   VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICHIGH) |
+			   VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICLOW) |
+			   VC4_SET_FIELD(0x1c, VC4_HD_MAI_THR_DREQHIGH) |
+			   VC4_SET_FIELD(0x1c, VC4_HD_MAI_THR_DREQLOW));
+	else
+		HDMI_WRITE(HDMI_MAI_THR,
+			   VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_PANICHIGH) |
+			   VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_PANICLOW) |
+			   VC4_SET_FIELD(0x6, VC4_HD_MAI_THR_DREQHIGH) |
+			   VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_DREQLOW));
 
 	HDMI_WRITE(HDMI_MAI_CONFIG,
 		   VC4_HDMI_MAI_CONFIG_BIT_REVERSE |