linux-kernel - [PATCH 2/3] drm/vkms: add support for multiple overlay planes

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Date:   Mon, 13 Dec 2021 19:11:30 +0100
From:   José Expósito <jose.exposito89@...il.com>
To:     rodrigosiqueiramelo@...il.com
Cc:     melissa.srw@...il.com, hamohammed.sa@...il.com, daniel@...ll.ch,
        airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        José Expósito <jose.exposito89@...il.com>
Subject: [PATCH 2/3] drm/vkms: add support for multiple overlay planes

Add a new module parameter to allow to set the number of overlay planes
to create. Set it to 1 by default in order to keep the "enable_overlay"
backwards compatible.

Signed-off-by: José Expósito <jose.exposito89@...il.com>
---
 drivers/gpu/drm/vkms/vkms_drv.c    | 5 +++++
 drivers/gpu/drm/vkms/vkms_drv.h    | 1 +
 drivers/gpu/drm/vkms/vkms_output.c | 9 ++++++---
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 0ffe5f0e33f7..bb98f6c6c561 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -51,6 +51,10 @@ static bool enable_overlay;
 module_param_named(enable_overlay, enable_overlay, bool, 0444);
 MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
 
+static unsigned int num_overlay_planes = 1;
+module_param_named(num_overlay_planes, num_overlay_planes, uint, 0444);
+MODULE_PARM_DESC(num_overlay_planes, "Number of overlay planes to create");
+
 DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
 
 static void vkms_release(struct drm_device *dev)
@@ -229,6 +233,7 @@ static int __init vkms_init(void)
 	config->cursor = enable_cursor;
 	config->writeback = enable_writeback;
 	config->overlay = enable_overlay;
+	config->num_overlay_planes = num_overlay_planes;
 
 	return vkms_create(config);
 }
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index d48c23d40ce5..33bdf717e3cd 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -97,6 +97,7 @@ struct vkms_config {
 	bool writeback;
 	bool cursor;
 	bool overlay;
+	unsigned int num_overlay_planes;
 	/* only set when instantiated */
 	struct vkms_device *dev;
 };
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index 2e805b2d36ae..6f26998fdb7e 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -57,15 +57,18 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
 	struct vkms_plane *primary, *cursor = NULL;
 	int ret;
 	int writeback;
+	unsigned int n;
 
 	primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index);
 	if (IS_ERR(primary))
 		return PTR_ERR(primary);
 
 	if (vkmsdev->config->overlay) {
-		ret = vkms_add_overlay_plane(vkmsdev, index, crtc);
-		if (ret)
-			return ret;
+		for (n = 0; n < vkmsdev->config->num_overlay_planes; n++) {
+			ret = vkms_add_overlay_plane(vkmsdev, index, crtc);
+			if (ret)
+				return ret;
+		}
 	}
 
 	if (vkmsdev->config->cursor) {
-- 
2.25.1