drm/i915/adl_p: Implement Wa_22012358565

Implement Wa_22012358565 to avoid underrun with 32bpp cursor
in some high bandwidth scenarios. The implementation calls for
overriding the arbitration slots for the planes.

v2: Fix adlp_plane_ctl_arb_slots() return type
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210526173600.27708-2-ville.syrjala@linux.intel.comReviewed-by: José Roberto de Souza <jose.souza@intel.com>

drivers/gpu/drm/i915/display/intel_cursor.c

@@ -383,6 +383,10 @@ static u32 i9xx_cursor_ctl(const struct intel_crtc_state *crtc_state,
 	if (plane_state->hw.rotation & DRM_MODE_ROTATE_180)
 		cntl |= MCURSOR_ROTATE_180;
 
+	/* Wa_22012358565:adlp */
+	if (DISPLAY_VER(dev_priv) == 13)
+		cntl |= MCURSOR_ARB_SLOTS(1);
+
 	return cntl;
 }
 

drivers/gpu/drm/i915/display/intel_display.c

@@ -975,6 +975,11 @@ void intel_enable_pipe(const struct intel_crtc_state *new_crtc_state)
 		/* FIXME: assert CPU port conditions for SNB+ */
 	}
 
+	/* Wa_22012358565:adlp */
+	if (DISPLAY_VER(dev_priv) == 13)
+		intel_de_rmw(dev_priv, PIPE_ARB_CTL(pipe),
+			     0, PIPE_ARB_USE_PROG_SLOTS);
+
 	reg = PIPECONF(cpu_transcoder);
 	val = intel_de_read(dev_priv, reg);
 	if (val & PIPECONF_ENABLE) {

drivers/gpu/drm/i915/display/skl_universal_plane.c

@@ -850,6 +850,29 @@ static u32 cnl_plane_ctl_flip(unsigned int reflect)
 	return 0;
 }
 
+static u32 adlp_plane_ctl_arb_slots(const struct intel_plane_state *plane_state)
+{
+	const struct drm_framebuffer *fb = plane_state->hw.fb;
+
+	if (intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) {
+		switch (fb->format->cpp[0]) {
+		case 2:
+			return PLANE_CTL_ARB_SLOTS(1);
+		default:
+			return PLANE_CTL_ARB_SLOTS(0);
+		}
+	} else {
+		switch (fb->format->cpp[0]) {
+		case 8:
+			return PLANE_CTL_ARB_SLOTS(3);
+		case 4:
+			return PLANE_CTL_ARB_SLOTS(1);
+		default:
+			return PLANE_CTL_ARB_SLOTS(0);
+		}
+	}
+}
+
 static u32 skl_plane_ctl_crtc(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
@@ -903,6 +926,10 @@ static u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
 	else if (key->flags & I915_SET_COLORKEY_SOURCE)
 		plane_ctl |= PLANE_CTL_KEY_ENABLE_SOURCE;
 
+	/* Wa_22012358565:adlp */
+	if (DISPLAY_VER(dev_priv) == 13)
+		plane_ctl |= adlp_plane_ctl_arb_slots(plane_state);
+
 	return plane_ctl;
 }
 

drivers/gpu/drm/i915/i915_reg.h

@@ -6140,6 +6140,10 @@ enum {
 #define  _PIPEBGCMAX           0x71010
 #define PIPEGCMAX(pipe, i)     _MMIO_PIPE2(pipe, _PIPEAGCMAX + (i) * 4)
 
+#define _PIPE_ARB_CTL_A			0x70028 /* icl+ */
+#define PIPE_ARB_CTL(pipe)		_MMIO_PIPE2(pipe, _PIPE_ARB_CTL_A)
+#define   PIPE_ARB_USE_PROG_SLOTS	REG_BIT(13)
+
 #define _PIPE_MISC_A			0x70030
 #define _PIPE_MISC_B			0x71030
 #define   PIPEMISC_YUV420_ENABLE	(1 << 27) /* glk+ */
@@ -6604,6 +6608,8 @@ enum {
 #define   MCURSOR_MODE_128_ARGB_AX ((1 << 5) | MCURSOR_MODE_128_32B_AX)
 #define   MCURSOR_MODE_256_ARGB_AX ((1 << 5) | MCURSOR_MODE_256_32B_AX)
 #define   MCURSOR_MODE_64_ARGB_AX ((1 << 5) | MCURSOR_MODE_64_32B_AX)
+#define   MCURSOR_ARB_SLOTS_MASK	REG_GENMASK(30, 28) /* icl+ */
+#define   MCURSOR_ARB_SLOTS(x)		REG_FIELD_PREP(MCURSOR_ARB_SLOTS_MASK, (x)) /* icl+ */
 #define   MCURSOR_PIPE_SELECT_MASK	(0x3 << 28)
 #define   MCURSOR_PIPE_SELECT_SHIFT	28
 #define   MCURSOR_PIPE_SELECT(pipe)	((pipe) << 28)
@@ -7055,6 +7061,8 @@ enum {
 #define _PLANE_CTL_2_A				0x70280
 #define _PLANE_CTL_3_A				0x70380
 #define   PLANE_CTL_ENABLE			(1 << 31)
+#define   PLANE_CTL_ARB_SLOTS_MASK		REG_GENMASK(30, 28) /* icl+ */
+#define   PLANE_CTL_ARB_SLOTS(x)		REG_FIELD_PREP(PLANE_CTL_ARB_SLOTS_MASK, (x)) /* icl+ */
 #define   PLANE_CTL_PIPE_GAMMA_ENABLE		(1 << 30)   /* Pre-GLK */
 #define   PLANE_CTL_YUV_RANGE_CORRECTION_DISABLE	(1 << 28)
 /*