[PATCH 26/32] drm/i915/xe3p_lpd: Enable pixel normalizer for fp16 formats for FBC

[Gustavo Sousa <gustavo.sousa@intel.com>]

From: Vinod Govindapillai <vinod.govindapillai@intel.com>

There is a hw restriction that we could enable the FBC for FP16
formats only if the pixel normalization block is enabled. Hence
enable the pixel normalizer block with normalzation factor as
1.0 for the supported FP16 formats to get the FBC enabled. Two
existing helper function definitions are moved up to avoid the
forward declarations as part of this patch as well.

Bspec: 69863, 68881
Cc: Shekhar Chauhan <shekhar.chauhan@intel.com>
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 50 ++++++++++++++--------
 .../drm/i915/display/skl_universal_plane_regs.h    |  1 +
 2 files changed, 33 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 16a9c141281b..ae1bf6beac95 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -486,6 +486,23 @@ static int skl_plane_max_height(const struct drm_framebuffer *fb,
 	return 4096;
 }
 
+static enum intel_fbc_id skl_fbc_id_for_pipe(enum pipe pipe)
+{
+	return pipe - PIPE_A + INTEL_FBC_A;
+}
+
+static bool skl_plane_has_fbc(struct intel_display *display,
+			      enum intel_fbc_id fbc_id, enum plane_id plane_id)
+{
+	if ((DISPLAY_RUNTIME_INFO(display)->fbc_mask & BIT(fbc_id)) == 0)
+		return false;
+
+	if (DISPLAY_VER(display) >= 20)
+		return icl_is_hdr_plane(display, plane_id);
+	else
+		return plane_id == PLANE_1;
+}
+
 static int icl_plane_max_height(const struct drm_framebuffer *fb,
 				int color_plane,
 				unsigned int rotation)
@@ -896,7 +913,21 @@ static void skl_write_plane_wm(struct intel_dsb *dsb,
 static void
 xe3p_lpd_plane_check_pixel_normalizer(struct intel_plane_state *plane_state)
 {
-	plane_state->pixel_normalizer = 0;
+	struct intel_display *display = to_intel_display(plane_state);
+	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
+	enum intel_fbc_id fbc_id = skl_fbc_id_for_pipe(plane->pipe);
+	u32 reg = 0;
+
+	/*
+	 * To enable FBC for FP16 formats, enable pixel normalizer with
+	 * normalization factor as 1.0
+	 */
+	if (skl_plane_has_fbc(display, fbc_id, plane->id) &&
+	    intel_fbc_is_fp16_format_supported(plane_state))
+		reg = PLANE_PIXEL_NORMALIZE_NORM_FACTOR(PLANE_PIXEL_NORMALIZE_NORM_FACTOR_1_0) |
+		      PLANE_PIXEL_NORMALIZE_ENABLE;
+
+	plane_state->pixel_normalizer = reg;
 }
 
 static void
@@ -2449,23 +2480,6 @@ void icl_link_nv12_planes(struct intel_plane_state *uv_plane_state,
 	}
 }
 
-static enum intel_fbc_id skl_fbc_id_for_pipe(enum pipe pipe)
-{
-	return pipe - PIPE_A + INTEL_FBC_A;
-}
-
-static bool skl_plane_has_fbc(struct intel_display *display,
-			      enum intel_fbc_id fbc_id, enum plane_id plane_id)
-{
-	if ((DISPLAY_RUNTIME_INFO(display)->fbc_mask & BIT(fbc_id)) == 0)
-		return false;
-
-	if (DISPLAY_VER(display) >= 20)
-		return icl_is_hdr_plane(display, plane_id);
-	else
-		return plane_id == PLANE_1;
-}
-
 static struct intel_fbc *skl_plane_fbc(struct intel_display *display,
 				       enum pipe pipe, enum plane_id plane_id)
 {
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane_regs.h b/drivers/gpu/drm/i915/display/skl_universal_plane_regs.h
index 11c713f9b237..eb25de5d1778 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane_regs.h
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane_regs.h
@@ -466,5 +466,6 @@
 #define   PLANE_PIXEL_NORMALIZE_ENABLE			REG_BIT(31)
 #define   PLANE_PIXEL_NORMALIZE_NORM_FACTOR_MASK	REG_GENMASK(15, 0)
 #define   PLANE_PIXEL_NORMALIZE_NORM_FACTOR(val)	REG_FIELD_PREP(PLANE_PIXEL_NORMALIZE_NORM_FACTOR_MASK, (val))
+#define   PLANE_PIXEL_NORMALIZE_NORM_FACTOR_1_0		0x3c00
 
 #endif /* __SKL_UNIVERSAL_PLANE_REGS_H__ */

-- 
2.51.0