From: Maxime Ripard <maxime@cerno.tech>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Maxime Ripard <maxime@cerno.tech>,
Daniel Vetter <daniel.vetter@intel.com>,
David Airlie <airlied@linux.ie>,
Florian Fainelli <f.fainelli@gmail.com>,
Scott Branden <sbranden@broadcom.com>,
Nicolas Saenz Julienne <nsaenz@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Ray Jui <rjui@broadcom.com>
Cc: Dave Stevenson <dave.stevenson@raspberrypi.com>,
Phil Elwell <phil@raspberrypi.com>,
Tim Gover <tim.gover@raspberrypi.com>,
Dom Cobley <dom@raspberrypi.com>,
bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org,
linux-rpi-kernel@lists.infradead.org, devicetree@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: [PATCH RESEND v4 v4 4/4] drm/vc4: Notify the firmware when DRM is in charge
Date: Mon, 13 Dec 2021 17:26:35 +0100 [thread overview]
Message-ID: <20211213162635.252582-5-maxime@cerno.tech> (raw)
In-Reply-To: <20211213162635.252582-1-maxime@cerno.tech>
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;
--
2.33.1
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prev parent reply other threads:[~2021-12-13 16:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-13 16:26 [PATCH RESEND v4 v4 0/4] drm/vc4: Use the firmware to stop the display pipeline Maxime Ripard
2021-12-13 16:26 ` [PATCH RESEND v4 v4 1/4] firmware: raspberrypi: Add RPI_FIRMWARE_NOTIFY_DISPLAY_DONE Maxime Ripard
2021-12-13 16:26 ` [PATCH RESEND v4 v4 2/4] drm/vc4: Support nomodeset Maxime Ripard
2021-12-14 8:30 ` Javier Martinez Canillas
2021-12-14 8:57 ` Thomas Zimmermann
2021-12-13 16:26 ` [PATCH RESEND v4 v4 3/4] drm/vc4: Remove conflicting framebuffers before callind bind_all Maxime Ripard
2021-12-13 16:26 ` Maxime Ripard [this message]
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