[Intel-gfx] [PATCH 2/2] drm/i915/adl_p: Implement Wa_22012358565

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

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.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_cursor.c   |  4 +++
 drivers/gpu/drm/i915/display/intel_display.c  |  5 ++++
 .../drm/i915/display/skl_universal_plane.c    | 27 +++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h               |  8 ++++++
 4 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_cursor.c b/drivers/gpu/drm/i915/display/intel_cursor.c
index 2ab389b38694..966e020331fb 100644
--- a/drivers/gpu/drm/i915/display/intel_cursor.c
+++ b/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;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index a2f3d255a906..e23dec8b0aab 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/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) {
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 59e032f3687a..64039f2138c8 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -867,6 +867,29 @@ static u32 skl_plane_ctl_crtc(const struct intel_crtc_state *crtc_state)
 	return plane_ctl;
 }
 
+static int 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(const struct intel_crtc_state *crtc_state,
 			 const struct intel_plane_state *plane_state)
 {
@@ -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;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e4d6336dab71..42f7909fc842 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6146,6 +6146,10 @@ 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+ */
@@ -6610,6 +6614,8 @@ 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)
@@ -7061,6 +7067,8 @@ 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)
 /*
-- 
2.26.3