Once the call to drm_fb_helper_remove_conflicting_framebuffers() has been made, simplefb has been unregistered and the KMS driver is entirely in charge of the display.
Thus, we can notify the firmware it can free whatever resource it was using to maintain simplefb functional.
Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_drv.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c index c0d7e510694f..e4bb37a191f6 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.c +++ b/drivers/gpu/drm/vc4/vc4_drv.c @@ -37,6 +37,8 @@ #include <drm/drm_fb_helper.h> #include <drm/drm_vblank.h>
+#include <soc/bcm2835/raspberrypi-firmware.h> + #include "uapi/drm/vc4_drm.h"
#include "vc4_drv.h" @@ -215,6 +217,7 @@ static void vc4_match_add_drivers(struct device *dev, static int vc4_drm_bind(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); + struct rpi_firmware *firmware = NULL; struct drm_device *drm; struct vc4_dev *vc4; struct device_node *node; @@ -251,10 +254,29 @@ static int vc4_drm_bind(struct device *dev) if (ret) return ret;
+ node = of_find_compatible_node(NULL, NULL, "raspberrypi,bcm2835-firmware"); + if (node) { + firmware = rpi_firmware_get(node); + of_node_put(node); + + if (!firmware) + return -EPROBE_DEFER; + } + ret = drm_aperture_remove_framebuffers(false, &vc4_drm_driver); if (ret) return ret;
+ if (firmware) { + ret = rpi_firmware_property(firmware, + RPI_FIRMWARE_NOTIFY_DISPLAY_DONE, + NULL, 0); + if (ret) + drm_warn(drm, "Couldn't stop firmware display driver: %d\n", ret); + + rpi_firmware_put(firmware); + } + ret = component_bind_all(dev, drm); if (ret) return ret;