linux-kernel - [PATCH 42/89] drm/vc4: plane: Create more planes

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Message-Id: <551ec34a673f930262bf5fefe7a5e3616cbb1e7a.1582533919.git-series.maxime@cerno.tech>
Date:   Mon, 24 Feb 2020 10:06:44 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Maxime Ripard <maxime@...no.tech>
Subject: [PATCH 42/89] drm/vc4: plane: Create more planes

Let's now create more planes that can be affected to all the CRTCs.

vc4 has 3 CRTCs, 1 primary and 1 cursor each, and was having 24 (8
planes per CRTC) overlays.

However, vc5 has 5 CRTCs, so keeping the same logic would put us at 50
planes which is well above the 32 planes limit imposed by DRM.

Using 16 seems like a good tradeoff between staying under 32 and yet
providing enough planes.

Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_plane.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index ea1d848aad14..49278bccdae0 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -1387,7 +1387,7 @@ int vc4_plane_create_additional_planes(struct drm_device *drm)
 	 * modest number of planes to expose, that should hopefully
 	 * still cover any sane usecase.
 	 */
-	for (i = 0; i < 8; i++) {
+	for (i = 0; i < 16; i++) {
 		struct drm_plane *plane =
 			vc4_plane_init(drm, DRM_PLANE_TYPE_OVERLAY);
 
-- 
git-series 0.9.1