I get a permanent FIFO underrun when enabling FEC with big joiner,
so for now disable it.
It seems that even at 1024x768 resolution without bigjoiner we don't
get a working configuration. Flag is set but vblank timing shows that
vblanks are delivered slightly faster, so the extra overhead we
calculated for data M/N goes unused.
Not-Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 4dfb78dc7fa2..02242a16640b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1877,7 +1877,8 @@ static bool intel_dp_source_supports_dsc(struct intel_dp *intel_dp,
static bool intel_dp_supports_dsc(struct intel_dp *intel_dp,
const struct intel_crtc_state *pipe_config)
{
- if (!intel_dp_is_edp(intel_dp) && !pipe_config->fec_enable)
+ /* HACK: Disable FEC until we solved FIFO underruns */
+ if (!intel_dp_is_edp(intel_dp) && !pipe_config->fec_enable && 0)
return false;
return intel_dp_source_supports_dsc(intel_dp, pipe_config) &&
@@ -2024,8 +2025,9 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
int pipe_bpp;
int ret;
+ /* HACK: Disable FEC until we solved FIFO underruns */
pipe_config->fec_enable = !intel_dp_is_edp(intel_dp) &&
- intel_dp_supports_fec(intel_dp, pipe_config);
+ intel_dp_supports_fec(intel_dp, pipe_config) && 0;
if (!intel_dp_supports_dsc(intel_dp, pipe_config))
return -EINVAL;
--
2.20.1
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