drm/i915/adlp: Add PIPE_MISC2 programming

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@intel.com>
Cc: Clint Taylor <clinton.a.taylor@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210519000625.3184321-17-lucas.demarchi@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 58be548..2bf713b 100644 (file)
--- 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 dcdc5b1..d4debb3 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6155,6 +6155,13 @@ 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)