From: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
When scalers are enabled, we need to program underrun
bubble counter to 0x50 to avoid Soft Pipe A underruns.
Make sure other bits dont get overwritten.
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
Signed-off-by: Clinton Taylor <Clinton.A.Taylor@xxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display.c | 21 ++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 7 +++++++
2 files changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index dd248995c53d..85077caa3744 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5716,8 +5716,12 @@ static void hsw_set_pipeconf(const struct intel_crtc_state *crtc_state)
static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ const struct intel_crtc_scaler_state *scaler_state =
+ &crtc_state->scaler_state;
+
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
u32 val = 0;
+ int i;
switch (crtc_state->pipe_bpp) {
case 18:
@@ -5756,6 +5760,23 @@ static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state)
if (DISPLAY_VER(dev_priv) >= 12)
val |= PIPEMISC_PIXEL_ROUNDING_TRUNC;
+ if (IS_ALDERLAKE_P(dev_priv)) {
+ bool scaler_in_use = false;
+
+ for (i = 0; i < crtc->num_scalers; i++) {
+ if (!scaler_state->scalers[i].in_use)
+ continue;
+
+ scaler_in_use = true;
+ break;
+ }
+
+ intel_de_rmw(dev_priv, PIPE_MISC2(crtc->pipe),
+ PIPE_MISC2_UNDERRUN_BUBBLE_COUNTER_MASK,
+ scaler_in_use ? PIPE_MISC2_BUBBLE_COUNTER_SCALER_EN :
+ PIPE_MISC2_BUBBLE_COUNTER_SCALER_DIS);
+ }
+
intel_de_write(dev_priv, PIPEMISC(crtc->pipe), val);
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9b8da4a6a0ae..6fd126b64727 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6163,6 +6163,13 @@ enum {
#define PIPEMISC_DITHER_TYPE_SP (0 << 2)
#define PIPEMISC(pipe) _MMIO_PIPE2(pipe, _PIPE_MISC_A)
+#define _PIPE_MISC2_A 0x7002C
+#define _PIPE_MISC2_B 0x7102C
+#define PIPE_MISC2_BUBBLE_COUNTER_SCALER_EN (0x50 << 24)
+#define PIPE_MISC2_BUBBLE_COUNTER_SCALER_DIS (0x14 << 24)
+#define PIPE_MISC2_UNDERRUN_BUBBLE_COUNTER_MASK (0xff << 24)
+#define PIPE_MISC2(pipe) _MMIO_PIPE2(pipe, _PIPE_MISC2_A)
+
/* Skylake+ pipe bottom (background) color */
#define _SKL_BOTTOM_COLOR_A 0x70034
#define SKL_BOTTOM_COLOR_GAMMA_ENABLE (1 << 31)
--
2.25.4
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