linux-kernel - [PATCH] drm/cirrus: add plane setup

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Date:   Mon,  4 Feb 2019 12:01:31 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org (open list:DRM DRIVER FOR
        QEMU'S CIRRUS DEVICE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/cirrus: add plane setup

Commit "f4bd542bca drm/fb-helper: Scale back depth to supported maximum"
uncovered a bug in the cirrus driver.  It must create its own primary
plane, using the correct format list, depending on the bpp module
parameter, so it is consistent with mode_config->preferred_depth.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/gpu/drm/cirrus/cirrus_mode.c | 67 +++++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/cirrus/cirrus_mode.c b/drivers/gpu/drm/cirrus/cirrus_mode.c
index a830e70fc0..2e966a22c5 100644
--- a/drivers/gpu/drm/cirrus/cirrus_mode.c
+++ b/drivers/gpu/drm/cirrus/cirrus_mode.c
@@ -360,10 +360,67 @@ static const struct drm_crtc_helper_funcs cirrus_helper_funcs = {
 };
 
 /* CRTC setup */
+static const uint32_t cirrus_formats_16[] = {
+	DRM_FORMAT_RGB565,
+};
+
+static const uint32_t cirrus_formats_24[] = {
+	DRM_FORMAT_RGB888,
+};
+
+static const uint32_t cirrus_formats_32[] = {
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_ARGB8888,
+};
+
+static struct drm_plane *cirrus_primary_plane(struct drm_device *dev)
+{
+	const uint32_t *formats;
+	uint32_t nformats;
+	struct drm_plane *primary;
+	int ret;
+
+	switch (cirrus_bpp) {
+	case 16:
+		formats = cirrus_formats_16;
+		nformats = ARRAY_SIZE(cirrus_formats_16);
+		break;
+	case 24:
+		formats = cirrus_formats_24;
+		nformats = ARRAY_SIZE(cirrus_formats_24);
+		break;
+	case 32:
+		formats = cirrus_formats_32;
+		nformats = ARRAY_SIZE(cirrus_formats_32);
+		break;
+	default:
+		return NULL;
+	}
+
+	primary = kzalloc(sizeof(*primary), GFP_KERNEL);
+	if (primary == NULL) {
+		DRM_DEBUG_KMS("Failed to allocate primary plane\n");
+		return NULL;
+	}
+
+	ret = drm_universal_plane_init(dev, primary, 0,
+				       &drm_primary_helper_funcs,
+				       formats, nformats,
+				       NULL,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret) {
+		kfree(primary);
+		primary = NULL;
+	}
+
+	return primary;
+}
+
 static void cirrus_crtc_init(struct drm_device *dev)
 {
 	struct cirrus_device *cdev = dev->dev_private;
 	struct cirrus_crtc *cirrus_crtc;
+	struct drm_plane *primary;
 
 	cirrus_crtc = kzalloc(sizeof(struct cirrus_crtc) +
 			      (CIRRUSFB_CONN_LIMIT * sizeof(struct drm_connector *)),
@@ -372,7 +429,15 @@ static void cirrus_crtc_init(struct drm_device *dev)
 	if (cirrus_crtc == NULL)
 		return;
 
-	drm_crtc_init(dev, &cirrus_crtc->base, &cirrus_crtc_funcs);
+	primary = cirrus_primary_plane(dev);
+	if (primary == NULL) {
+		kfree(cirrus_crtc);
+		return;
+	}
+
+	drm_crtc_init_with_planes(dev, &cirrus_crtc->base,
+				  primary, NULL,
+				  &cirrus_crtc_funcs, NULL);
 
 	drm_mode_crtc_set_gamma_size(&cirrus_crtc->base, CIRRUS_LUT_SIZE);
 	cdev->mode_info.crtc = cirrus_crtc;
-- 
2.9.3