From 9e9177db83609c19bbe523cc4d20119cf09ea787 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Wed, 15 Dec 2021 10:51:17 +0100 Subject: [PATCH] drm/vc4: Notify the firmware when DRM is in charge 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 Reviewed-by: Javier Martinez Canillas Acked-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20211215095117.176435-5-maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_drv.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) --- a/drivers/gpu/drm/vc4/vc4_drv.c +++ b/drivers/gpu/drm/vc4/vc4_drv.c @@ -37,6 +37,8 @@ #include #include +#include + #include "uapi/drm/vc4_drm.h" #include "vc4_drv.h" @@ -226,6 +228,7 @@ static const struct of_device_id vc4_dma 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; @@ -272,10 +275,29 @@ static int vc4_drm_bind(struct device *d 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;