[PATCH v3 035/105] drm/vc4: crtc: Add function to compute FIFO level bits

[Maxime Ripard]

The longer FIFOs in vc5 pixelvalves means that the FIFO full level
doesn't fit in the original register field and that we also have a
secondary field. In order to prepare for this, let's move the registers
fill part to a helper function.

Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index e25e81bf64e7..12cfa0fb2e19 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -275,6 +275,15 @@ static u32 vc4_get_fifo_full_level(struct vc4_crtc *vc4_crtc, u32 format)
 	}
 }
 
+static u32 vc4_crtc_get_fifo_full_level_bits(struct vc4_crtc *vc4_crtc,
+					     u32 format)
+{
+	u32 level = vc4_get_fifo_full_level(vc4_crtc, format);
+
+	return VC4_SET_FIELD(level & 0x3f,
+			     PV_CONTROL_FIFO_LEVEL);
+}
+
 /*
  * Returns the encoder attached to the CRTC.
  *
@@ -376,9 +385,8 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc)
 		CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
 
 	CRTC_WRITE(PV_CONTROL,
+		   vc4_crtc_get_fifo_full_level_bits(vc4_crtc, format) |
 		   VC4_SET_FIELD(format, PV_CONTROL_FORMAT) |
-		   VC4_SET_FIELD(vc4_get_fifo_full_level(vc4_crtc, format),
-				 PV_CONTROL_FIFO_LEVEL) |
 		   VC4_SET_FIELD(pixel_rep - 1, PV_CONTROL_PIXEL_REP) |
 		   PV_CONTROL_CLR_AT_START |
 		   PV_CONTROL_TRIGGER_UNDERFLOW |
-- 
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