diff options
| author | Luca Leonardo Scorcia <l.scorcia@gmail.com> | 2026-02-12 19:22:47 +0000 |
|---|---|---|
| committer | Chun-Kuang Hu <chunkuang.hu@kernel.org> | 2026-03-22 13:03:09 +0000 |
| commit | 86d5f60dea00a56ed3da9612028f930d78336adf (patch) | |
| tree | aae0f74310f183f5717e62e0d571b889f0be0ab9 | |
| parent | 76255024cadbe8c40462953f8193d2d78cd3b0ac (diff) | |
| download | linux-86d5f60dea00a56ed3da9612028f930d78336adf.tar.gz linux-86d5f60dea00a56ed3da9612028f930d78336adf.zip | |
drm/mediatek: Remove all conflicting aperture devices during probe
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.
Signed-off-by: Luca Leonardo Scorcia <l.scorcia@gmail.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20260212192605.263160-1-l.scorcia@gmail.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 |
1 files changed, 5 insertions, 0 deletions
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 <yt.shen@mediatek.com> */ +#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; |