diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0505-vc4-drm-Avoid-full-hdmi-audio-fifo-writes.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0505-vc4-drm-Avoid-full-hdmi-audio-fifo-writes.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0505-vc4-drm-Avoid-full-hdmi-audio-fifo-writes.patch b/target/linux/bcm27xx/patches-5.10/950-0505-vc4-drm-Avoid-full-hdmi-audio-fifo-writes.patch new file mode 100644 index 0000000000..7f9df9b0ff --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0505-vc4-drm-Avoid-full-hdmi-audio-fifo-writes.patch @@ -0,0 +1,32 @@ +From d0df79e13ab947367b86d7861e34f85aa6aad020 Mon Sep 17 00:00:00 2001 +From: Dom Cobley <popcornmix@gmail.com> +Date: Sun, 24 Jan 2021 15:44:10 +0000 +Subject: [PATCH] vc4/drm: Avoid full hdmi audio fifo writes + +We are getting occasional VC4_HD_MAI_CTL_ERRORF in +HDMI_MAI_CTL which seem to correspond with audio dropouts. + +Reduce the threshold where we deassert DREQ to avoid the fifo overfilling + +Signed-off-by: Dom Cobley <popcornmix@gmail.com> +--- + drivers/gpu/drm/vc4/vc4_hdmi.c | 8 ++++---- + 1 file changed, 4 insertions(+), 4 deletions(-) + +--- a/drivers/gpu/drm/vc4/vc4_hdmi.c ++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c +@@ -1294,10 +1294,10 @@ static int vc4_hdmi_audio_prepare(struct + + /* Set the MAI threshold */ + 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(0x10, VC4_HD_MAI_THR_DREQHIGH) | +- VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_DREQLOW)); ++ 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)); + + HDMI_WRITE(HDMI_MAI_CONFIG, + VC4_HDMI_MAI_CONFIG_BIT_REVERSE | |