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- From bf7f969a35078e4a26ca2beb562593bcbf636afa Mon Sep 17 00:00:00 2001
- From: Dom Cobley <[email protected]>
- 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 <[email protected]>
- ---
- 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
- @@ -1613,10 +1613,10 @@ 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 |
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