On Tue, Aug 07, 2018 at 09:39:19PM +0200, Paul Kocialkowski wrote:
> Initializing and registering fbdev requires at least one DRM connector
> and will fail otherwise. In order to support headless setups (for
> instance for GPU rendering with the GBM backend, where a DRI card node
> is required to provide GEM memory reservation), add a check on the
> number of registered connectors before initializing fbdev.
sun4i is a pure kms driver, why exactly do you need it for gbm backed
rendering? What exactly is rendering here, and why does it insist on a
display card node, even if that display card node is 100% defunct?
-Daniel
> Signed-off-by: Paul Kocialkowski <contact@xxxxxxxx>
> ---
> drivers/gpu/drm/sun4i/sun4i_framebuffer.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
> index 5f29850ef8ac..19a265e4a93a 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
> @@ -49,6 +49,8 @@ static struct drm_mode_config_helper_funcs sun4i_de_mode_config_helpers = {
>
> int sun4i_framebuffer_init(struct drm_device *drm)
> {
> + int ret;
> +
> drm_mode_config_reset(drm);
>
> drm->mode_config.max_width = 8192;
> @@ -57,7 +59,13 @@ int sun4i_framebuffer_init(struct drm_device *drm)
> drm->mode_config.funcs = &sun4i_de_mode_config_funcs;
> drm->mode_config.helper_private = &sun4i_de_mode_config_helpers;
>
> - return drm_fb_cma_fbdev_init(drm, 32, 0);
> + if (drm->mode_config.num_connector > 0) {
> + ret = drm_fb_cma_fbdev_init(drm, 32, 0);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> }
>
> void sun4i_framebuffer_free(struct drm_device *drm)
> --
> 2.18.0
>
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> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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