openwrt/target/linux/bcm27xx/patches-6.6/950-0594-drm-vc4-hvs-Rework-LBM-alignment.patch

From ec3556d9297746b663b628fa9794d742359397c8 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Thu, 13 Apr 2023 10:12:19 +0200
Subject: [PATCH 0594/1085] drm/vc4: hvs: Rework LBM alignment

With the introduction of the support for BCM2712, the check of whether
we're running on vc5 or not to compute the LBM alignment requirement
doesn't work anymore.

Moreover, the LBM size will need to be computed in words for the
BCM2712, while we've had sizes in bytes so far.

Aligning on either 64 or 32 words is thus fairly harmful on BCM2712, so
let's just explicitly align the size when needed, and then call
drm_mm_insert_node_generic() with an alignment of 1.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_plane.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -744,6 +744,11 @@ static int vc4_plane_allocate_lbm(struct
 	if (!lbm_size)
 		return 0;
 
+	if (vc4->gen == VC4_GEN_5)
+		lbm_size = ALIGN(lbm_size, 64);
+	else if (vc4->gen == VC4_GEN_4)
+		lbm_size = ALIGN(lbm_size, 32);
+
 	drm_dbg_driver(drm, "[PLANE:%d:%s] LBM Allocation Size: %u\n",
 		       plane->base.id, plane->name, lbm_size);
 
@@ -759,8 +764,7 @@ static int vc4_plane_allocate_lbm(struct
 		spin_lock_irqsave(&vc4->hvs->mm_lock, irqflags);
 		ret = drm_mm_insert_node_generic(&vc4->hvs->lbm_mm,
 						 &vc4_state->lbm,
-						 lbm_size,
-						 vc4->gen == VC4_GEN_5 ? 64 : 32,
+						 lbm_size, 1,
 						 0, 0);
 		spin_unlock_irqrestore(&vc4->hvs->mm_lock, irqflags);