linux-kernel - [PATCH v3 020/105] drm/vc4: plane: Create overlays for any CRTC

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Message-Id: <74d84c75511974bc1ff4bc044413894a43a907a6.1590594512.git-series.maxime@cerno.tech>
Date:   Wed, 27 May 2020 17:47:50 +0200
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 v3 020/105] drm/vc4: plane: Create overlays for any CRTC

Now that we have everything in place, we can now register all the overlay
planes that can be assigned to all the CRTCs.

This has two side effects:

  - The number of overlay planes is reduced from 24 to 8. This is temporary
    and will be increased again in the next patch.

  - The ID of the various planes is changed again, and we will now have all
    the primary planes, then all the overlay planes and finally the cursor
    planes. This shouldn't cause any issue since the ordering between
    primary, overlay and cursor planes is preserved.

Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_plane.c | 35 +++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 824c188980b0..5335123ae2a0 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -1378,26 +1378,27 @@ int vc4_plane_create_additional_planes(struct drm_device *drm)
 	struct drm_crtc *crtc;
 	unsigned int i;
 
-	drm_for_each_crtc(crtc, drm) {
-		/* Set up some arbitrary number of planes.  We're not limited
-		 * by a set number of physical registers, just the space in
-		 * the HVS (16k) and how small an plane can be (28 bytes).
-		 * However, each plane we set up takes up some memory, and
-		 * increases the cost of looping over planes, which atomic
-		 * modesetting does quite a bit.  As a result, we pick a
-		 * modest number of planes to expose, that should hopefully
-		 * still cover any sane usecase.
-		 */
-		for (i = 0; i < 8; i++) {
-			struct drm_plane *plane =
-				vc4_plane_init(drm, DRM_PLANE_TYPE_OVERLAY);
+	/* Set up some arbitrary number of planes.  We're not limited
+	 * by a set number of physical registers, just the space in
+	 * the HVS (16k) and how small an plane can be (28 bytes).
+	 * However, each plane we set up takes up some memory, and
+	 * increases the cost of looping over planes, which atomic
+	 * modesetting does quite a bit.  As a result, we pick a
+	 * modest number of planes to expose, that should hopefully
+	 * still cover any sane usecase.
+	 */
+	for (i = 0; i < 8; i++) {
+		struct drm_plane *plane =
+			vc4_plane_init(drm, DRM_PLANE_TYPE_OVERLAY);
 
-			if (IS_ERR(plane))
-				continue;
+		if (IS_ERR(plane))
+			continue;
 
-			plane->possible_crtcs = drm_crtc_mask(crtc);
-		}
+		plane->possible_crtcs =
+			GENMASK(drm->mode_config.num_crtc - 1, 0);
+	}
 
+	drm_for_each_crtc(crtc, drm) {
 		/* Set up the legacy cursor after overlay initialization,
 		 * since we overlay planes on the CRTC in the order they were
 		 * initialized.
-- 
git-series 0.9.1