Update the reference overhead values for audio bw calculations
for MTL onwards
v2: fix the patch description (Kai)
Bspec: 67768
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@xxxxxxxxx>
Reviewed-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index efcba6e5c452..25691f87f779 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -109,6 +109,8 @@
/* DP Audio bw params calculations. Bspec: 67768 */
#define DP_AUDIO_BW_HBLANK_OVERHEAD_AVAIL 64
#define DP_AUDIO_BW_HBLANK_OVERHEAD_REQ 80
+#define MTL_DP_AUDIO_BW_HBLANK_OVERHEAD_REQ 0
+
/* Constants for DP DSC configurations */
static const u8 valid_dsc_bpp[] = {6, 8, 10, 12, 15};
@@ -3071,10 +3073,15 @@ intel_dp_audio_compute_bw_limits(struct intel_encoder *encoder,
struct intel_display *display = to_intel_display(encoder);
struct intel_connector *connector = to_intel_connector(conn_state->connector);
int hblank_bytes_avail_overhead = DP_AUDIO_BW_HBLANK_OVERHEAD_AVAIL;
- int hblank_bytes_req_overhead = DP_AUDIO_BW_HBLANK_OVERHEAD_REQ;
+ int hblank_bytes_req_overhead;
int hblank_slots_lanes_bytes;
int line_freq_khz;
+ if (DISPLAY_VER(display) >= 14)
+ hblank_bytes_req_overhead = MTL_DP_AUDIO_BW_HBLANK_OVERHEAD_REQ;
+ else
+ hblank_bytes_req_overhead = DP_AUDIO_BW_HBLANK_OVERHEAD_REQ;
+
intel_dp_compute_audio_bwparams(crtc_state, &line_freq_khz,
&hblank_slots_lanes_bytes);
drm_dbg_kms(display->drm,
--
2.34.1
