[PATCH V4 2/3] drm/vkms: Add support for writeback module

[Sumera Priyadarsini]

Add enable_writeback feature to vkms_config as a module.

Signed-off-by: Sumera Priyadarsini <sylphrena...@gmail.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 6b33975a5cb2..708f7f54001d 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -40,6 +40,10 @@ static bool enable_cursor = true;
 module_param_named(enable_cursor, enable_cursor, bool, 0444);
 MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
 
+static bool enable_writeback = true;
+module_param_named(enable_writeback, enable_writeback, bool, 0444);
+MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector 
support");
+
 DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
 
 static void vkms_release(struct drm_device *dev)
@@ -189,6 +193,7 @@ static int __init vkms_init(void)
        default_config = config;
 
        config->cursor = enable_cursor;
+       config->writeback = enable_writeback;
 
        return vkms_create(config);
 }
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 6a27bd8875f2..b9b4e2bc11c0 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -83,6 +83,7 @@ struct vkms_output {
 struct vkms_device;
 
 struct vkms_config {
+       bool writeback;
        bool cursor;
        /* 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 8f3ffb28b9d1..f5f6f15c362c 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -41,6 +41,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
        struct drm_crtc *crtc = &output->crtc;
        struct drm_plane *primary, *cursor = NULL;
        int ret;
+       int writeback;
 
        primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index);
        if (IS_ERR(primary))
@@ -80,9 +81,11 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
                goto err_attach;
        }
 
-       ret = vkms_enable_writeback_connector(vkmsdev);
-       if (ret)
-               DRM_ERROR("Failed to init writeback connector\n");
+       if (vkmsdev->config->writeback) {
+               writeback = vkms_enable_writeback_connector(vkmsdev);
+               if (writeback)
+                       DRM_ERROR("Failed to init writeback connector\n");
+       }
 
        drm_mode_config_reset(dev);
 
-- 
2.25.1