linux-kernel - [PATCH 38/89] drm/vc4: plane: Move planes creation to its own function

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Date:   Mon, 24 Feb 2020 10:06:40 +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 38/89] drm/vc4: plane: Move planes creation to its own function

The planes so far were created as part of the CRTC binding code with
each planes created associated only to one CRTC. However, the hardware
in the vc4 doesn't really have such constraint and can be used with any
CRTC.

In order to rework this, let's first move the overlay and cursor planes
creation to a function of its own.

Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_crtc.c  | 33 +++---------------------------
 drivers/gpu/drm/vc4/vc4_drv.h   |  2 ++-
 drivers/gpu/drm/vc4/vc4_plane.c | 38 ++++++++++++++++++++++++++++++++++-
 3 files changed, 44 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 381702b9f057..43cfc9ba18ba 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -1141,7 +1141,7 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
 	struct drm_device *drm = dev_get_drvdata(master);
 	struct vc4_crtc *vc4_crtc;
 	struct drm_crtc *crtc;
-	struct drm_plane *primary_plane, *cursor_plane, *destroy_plane, *temp;
+	struct drm_plane *primary_plane, *destroy_plane, *temp;
 	const struct of_device_id *match;
 	int ret, i;
 
@@ -1189,34 +1189,9 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
 	 */
 	drm_crtc_enable_color_mgmt(crtc, 0, true, crtc->gamma_size);
 
-	/* 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;
-
-		plane->possible_crtcs = drm_crtc_mask(crtc);
-	}
-
-	/* Set up the legacy cursor after overlay initialization,
-	 * since we overlay planes on the CRTC in the order they were
-	 * initialized.
-	 */
-	cursor_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_CURSOR);
-	if (!IS_ERR(cursor_plane)) {
-		cursor_plane->possible_crtcs = drm_crtc_mask(crtc);
-		crtc->cursor = cursor_plane;
-	}
+	ret = vc4_plane_create_additional_planes(drm, crtc);
+	if (ret)
+		goto err_destroy_planes;
 
 	vc4_crtc_get_cob_allocation(vc4_crtc);
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 63c05c764942..cc73c06e019d 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -848,6 +848,8 @@ int vc4_kms_load(struct drm_device *dev);
 /* vc4_plane.c */
 struct drm_plane *vc4_plane_init(struct drm_device *dev,
 				 enum drm_plane_type type);
+int vc4_plane_create_additional_planes(struct drm_device *dev,
+				       struct drm_crtc *crtc);
 u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist);
 u32 vc4_plane_dlist_size(const struct drm_plane_state *state);
 void vc4_plane_async_set_fb(struct drm_plane *plane,
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 26e96b15e9b4..e4dab514efef 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -1371,3 +1371,41 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
 
 	return plane;
 }
+
+int vc4_plane_create_additional_planes(struct drm_device *drm,
+				       struct drm_crtc *crtc)
+{
+	struct drm_plane *cursor_plane;
+	unsigned int i;
+
+	/* 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;
+
+		plane->possible_crtcs = drm_crtc_mask(crtc);
+	}
+
+	/* Set up the legacy cursor after overlay initialization,
+	 * since we overlay planes on the CRTC in the order they were
+	 * initialized.
+	 */
+	cursor_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_CURSOR);
+	if (!IS_ERR(cursor_plane)) {
+		cursor_plane->possible_crtcs = drm_crtc_mask(crtc);
+		crtc->cursor = cursor_plane;
+	}
+
+	return 0;
+}
-- 
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