[PATCH RESEND v4 v4 4/4] drm/vc4: Notify the firmware when DRM is in charge
From: Maxime Ripard <hidden>
Date: 2021-12-13 16:26:47
Also in:
dri-devel, linux-devicetree
Subsystem:
drm drivers, drm drivers and misc gpu patches, drm drivers for vc4, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Dave Stevenson, Linus Torvalds
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 <redacted> --- 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;
--
2.33.1
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