Hi, Luca: Luca Leonardo Scorcia <[email protected]> 於 2026年2月12日週四 下午7:26寫道： > > If a device has a framebuffer available it might be already used as > display by simple-framebuffer or simpledrm when mediatek-drm is probed. > This is actually helpful when porting to a new device as > framebuffers are simple to setup in device trees and fbcon can be > used to monitor the kernel boot process. > > When drm-mediatek loads a new fb device is initialized, however > fbcon remains attached to the initial framebuffer which is no longer > connected to the actual display - the early fb is never removed. > > We can gracefully transition from framebuffer handling to drm-managed > display by calling aperture_remove_all_conflicting_devices before > registering mediatek-drm. This takes care of unloading other fb > devices/drivers and disconnects fbcon which then automatically > reconnects to mediatekdrmfb as soon as it's available. > > The function is invoked just before drm_dev_register() to kick out > the existing framebuffer as late as possible to reduce the time the > screen is unresponsive.
Applied to mediatek-drm-next [1], thanks. [1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next Regards, Chun-Kuang. > > Signed-off-by: Luca Leonardo Scorcia <[email protected]> > --- > v2: Moved the call to aperture_remove_all_conflicting_devices to > right before drm_dev_register() > > drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c > b/drivers/gpu/drm/mediatek/mtk_drm_drv.c > index a94c51a83261..02effd9fc698 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c > @@ -4,6 +4,7 @@ > * Author: YT SHEN <[email protected]> > */ > > +#include <linux/aperture.h> > #include <linux/component.h> > #include <linux/module.h> > #include <linux/of.h> > @@ -670,6 +671,10 @@ static int mtk_drm_bind(struct device *dev) > if (ret < 0) > goto err_free; > > + ret = aperture_remove_all_conflicting_devices(DRIVER_NAME); > + if (ret < 0) > + dev_err(dev, "Error %d while removing conflicting aperture > devices", ret); > + > ret = drm_dev_register(drm, 0); > if (ret < 0) > goto err_deinit; > -- > 2.43.0 >
