diff mbox series

[3/5] drm/vblank: Remove num_crtcs argument from drm_vblank_init()

Message ID 20260814203542.1405135-4-lyude@redhat.com (mailing list archive)
State New
Headers
Series drm/vblank: Enforce all-or-nothing vblank support |

Commit Message

Lyude Paul Aug. 14, 2026, 8:35 p.m. UTC 
As it turns out: the entire reason we ever asked for the number of CRTCs as
a parameter for drm_vblank_init() is because that function was previously
in charge of setting up the legacy drm_device.num_crtcs variable, which
itself was also used to keep track of whether or not drm_vblank_init() was
called. And, that number was kept in addition to a properly maintained
drm_device->mode_config.num_crtc.

Now that we've removed that legacy variable entirely, let's stop requiring
the num_crtc argument for drm_vblank_init() entirely. The main motivation
for this is the fact that at the moment, we've had to workaround this
oddity in the Rust kernel bindings for a few reasons:

* We can't know the number of CRTCs until they've all been created, which
  meant that we had to keep track of that.
* Additionally, we also had to keep track of which CRTCs did and did not
  have vblank support. This is especially silly, because I am not aware of
  any physical hardware that only supports vblank interrupts on certain
  heads - and I can't think of any reasonable explanation for any hardware
  manufacturer making a design choice like that.
* This also implies that drivers could, with the current C API, register
  that they have a different number of CRTCs then they have actually
  created. This appears to be an edge case that could easily lead to UB
  since it's not obvious and as such has likely never really been tested.
  And we can't have that in Rust!

While the last point could technically still be an issue if a driver
doesn't fill out the vblank handling callbacks for all CRTCs, this is a
good start at cleaning this strange behavior up.

So, just get rid of this parameter entirely and start using the DRM's
internal count of CRTCs. We apply this change across the tree using this
coccinelle patch:

  virtual patch

  @depends on patch@
  expression dev;
  @@

  - drm_vblank_init(dev, ...)
  + drm_vblank_init(dev)

And then fixup some of the funky whitespace errors that introduces by hand.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Assisted-by: Coccinelle
---
 drivers/gpu/drm/adp/adp_drv.c                       | 2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c            | 2 +-
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c              | 2 +-
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c               | 2 +-
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c               | 2 +-
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c   | 2 +-
 drivers/gpu/drm/arm/display/komeda/komeda_kms.c     | 2 +-
 drivers/gpu/drm/arm/hdlcd_drv.c                     | 2 +-
 drivers/gpu/drm/arm/malidp_drv.c                    | 2 +-
 drivers/gpu/drm/armada/armada_drv.c                 | 2 +-
 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c             | 2 +-
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c        | 2 +-
 drivers/gpu/drm/drm_vblank.c                        | 6 +++---
 drivers/gpu/drm/exynos/exynos_drm_drv.c             | 2 +-
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c           | 2 +-
 drivers/gpu/drm/gma500/psb_drv.c                    | 2 +-
 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c     | 2 +-
 drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c     | 2 +-
 drivers/gpu/drm/hyperv/hyperv_drm_modeset.c         | 2 +-
 drivers/gpu/drm/i915/display/intel_display_driver.c | 3 +--
 drivers/gpu/drm/imx/dc/dc-kms.c                     | 2 +-
 drivers/gpu/drm/imx/dcss/dcss-kms.c                 | 2 +-
 drivers/gpu/drm/imx/ipuv3/imx-drm-core.c            | 2 +-
 drivers/gpu/drm/imx/lcdc/imx-lcdc.c                 | 2 +-
 drivers/gpu/drm/ingenic/ingenic-drm-drv.c           | 2 +-
 drivers/gpu/drm/kmb/kmb_drv.c                       | 2 +-
 drivers/gpu/drm/logicvc/logicvc_mode.c              | 2 +-
 drivers/gpu/drm/loongson/lsdc_drv.c                 | 2 +-
 drivers/gpu/drm/mcde/mcde_drv.c                     | 2 +-
 drivers/gpu/drm/mediatek/mtk_drm_drv.c              | 2 +-
 drivers/gpu/drm/meson/meson_drv.c                   | 2 +-
 drivers/gpu/drm/msm/msm_kms.c                       | 2 +-
 drivers/gpu/drm/mxsfb/lcdif_drv.c                   | 2 +-
 drivers/gpu/drm/mxsfb/mxsfb_drv.c                   | 2 +-
 drivers/gpu/drm/nouveau/nouveau_display.c           | 2 +-
 drivers/gpu/drm/omapdrm/omap_drv.c                  | 2 +-
 drivers/gpu/drm/pl111/pl111_drv.c                   | 2 +-
 drivers/gpu/drm/qxl/qxl_display.c                   | 2 +-
 drivers/gpu/drm/radeon/radeon_irq_kms.c             | 2 +-
 drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c       | 2 +-
 drivers/gpu/drm/renesas/rz-du/rzg2l_du_kms.c        | 2 +-
 drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c    | 2 +-
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c         | 2 +-
 drivers/gpu/drm/sprd/sprd_drm.c                     | 2 +-
 drivers/gpu/drm/sti/sti_compositor.c                | 2 +-
 drivers/gpu/drm/stm/ltdc.c                          | 2 +-
 drivers/gpu/drm/sun4i/sun4i_drv.c                   | 2 +-
 drivers/gpu/drm/tegra/drm.c                         | 2 +-
 drivers/gpu/drm/tidss/tidss_kms.c                   | 2 +-
 drivers/gpu/drm/tilcdc/tilcdc_drv.c                 | 2 +-
 drivers/gpu/drm/tiny/bochs.c                        | 2 +-
 drivers/gpu/drm/tiny/cirrus-qemu.c                  | 2 +-
 drivers/gpu/drm/tve200/tve200_drv.c                 | 2 +-
 drivers/gpu/drm/vc4/vc4_kms.c                       | 2 +-
 drivers/gpu/drm/verisilicon/vs_drm.c                | 2 +-
 drivers/gpu/drm/virtio/virtgpu_display.c            | 2 +-
 drivers/gpu/drm/vkms/vkms_drv.c                     | 3 +--
 drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c                | 2 +-
 drivers/gpu/drm/xlnx/zynqmp_kms.c                   | 2 +-
 include/drm/drm_vblank.h                            | 2 +-
 60 files changed, 62 insertions(+), 64 deletions(-)

Comments

sashiko-bot@kernel.org Aug. 14, 2026, 8:51 p.m. UTC | #1 
Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Critical] drm_vblank_init() returns -ENODEV causing probe failures in multiple drivers
--

--- Patch [3]: [PATCH 3/5] drm/vblank: Remove num_crtcs argument from drm_vblank_init() ---
commit 049e1e142facf2bbdd92cd8a8847a53f6b18b3aa
Author: Lyude Paul <lyude@redhat.com>

drm/vblank: Remove num_crtcs argument from drm_vblank_init()

This commit removes the num_crtcs argument from drm_vblank_init() and
updates callers across the tree to rely on the internal DRM count of CRTCs
instead. The change was applied mechanically using a Coccinelle patch.

> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> index d4577663a1f0e..ba78695d1015c 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> @@ -205,7 +205,7 @@ static int aspeed_gfx_load(struct drm_device *drm)
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = drm_vblank_init(drm, 1);
> +	ret = drm_vblank_init(drm);

[Severity: Critical]
Will this cause a probe regression for this driver?

By removing the explicit CRTC count, drm_vblank_init() now relies on the
DRM device's internal CRTC list being populated. However, aspeed_gfx_load()
calls drm_vblank_init() before calling aspeed_gfx_create_pipe(), which is
where the CRTC is actually created.

Because the CRTC list is empty at this point, drm_vblank_init() will
return -ENODEV and fail the probe.

>  	if (ret < 0) {
>  		dev_err(drm->dev, "Failed to initialise vblank\n");
>  		return ret;

> [ ... ]

> diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
> index 9228a7ad0dfa4..c9e29da53d056 100644
> --- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
> +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
> @@ -888,7 +888,7 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
>  	 * Initialize vertical blanking interrupts handling. Start with vblank
>  	 * disabled for all CRTCs.
>  	 */
> -	ret = drm_vblank_init(dev, rcdu->num_crtcs);
> +	ret = drm_vblank_init(dev);

[Severity: Critical]
Does this introduce a similar regression for rcar-du?

The driver calls drm_vblank_init() here, but the CRTCs are not created
until the rcar_du_crtc_create() loop further down. This means
drm_vblank_init() will see an empty CRTC list and fail with -ENODEV.

>  	if (ret < 0)
>  		return ret;

> [ ... ]

> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index 5a640b531d88f..5a830cee7fe9b 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -192,8 +192,7 @@ int vkms_create(struct vkms_config *config)
>  		goto out_devres;
>  	}
>  
> -	ret = drm_vblank_init(&vkms_device->drm,
> -			      vkms_config_get_num_crtcs(config));
> +	ret = drm_vblank_init(&vkms_device->drm);

[Severity: Critical]
Can this lead to a complete initialization failure for vkms?

The call to drm_vblank_init() occurs before vkms_modeset_init(), meaning
the pipeline components have not been created yet and the internal CRTC
count is zero.

>  	if (ret) {
>  		DRM_ERROR("Failed to vblank\n");
>  		goto out_devres;
diff mbox series

Patch

diff --git a/drivers/gpu/drm/adp/adp_drv.c b/drivers/gpu/drm/adp/adp_drv.c
index ce9dd6222634d..cc1ed68806cf1 100644
--- a/drivers/gpu/drm/adp/adp_drv.c
+++ b/drivers/gpu/drm/adp/adp_drv.c
@@ -444,7 +444,7 @@  static int adp_setup_mode_config(struct adp_drv_private *adp)
 	if (IS_ERR(adp->connector))
 		return PTR_ERR(adp->connector);
 
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret < 0) {
 		drm_err(drm, "failed to initialize vblank");
 		return ret;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
index 170adaf7e76ab..79aaa9d8fcdaf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
@@ -413,7 +413,7 @@  static int amdgpu_vkms_sw_init(struct amdgpu_ip_block *ip_block)
 			return r;
 	}
 
-	r = drm_vblank_init(adev_to_drm(adev), adev->mode_info.num_crtc);
+	r = drm_vblank_init(adev_to_drm(adev));
 	if (r)
 		return r;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index f2977fe6d8242..649d331973280 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -2809,7 +2809,7 @@  static int dce_v10_0_sw_init(struct amdgpu_ip_block *ip_block)
 	/* XXX: can this be enabled for DC? */
 	adev_to_drm(adev)->vblank_disable_immediate = true;
 
-	r = drm_vblank_init(adev_to_drm(adev), adev->mode_info.num_crtc);
+	r = drm_vblank_init(adev_to_drm(adev));
 	if (r)
 		return r;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
index c68de0fe1d7d3..d82272ca3b33d 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -2759,7 +2759,7 @@  static int dce_v6_0_sw_init(struct amdgpu_ip_block *ip_block)
 	/* XXX: can this be enabled for DC? */
 	adev_to_drm(adev)->vblank_disable_immediate = true;
 
-	r = drm_vblank_init(adev_to_drm(adev), adev->mode_info.num_crtc);
+	r = drm_vblank_init(adev_to_drm(adev));
 	if (r)
 		return r;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index c3906270f25ef..76d6db1959643 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -2728,7 +2728,7 @@  static int dce_v8_0_sw_init(struct amdgpu_ip_block *ip_block)
 	/* XXX: can this be enabled for DC? */
 	adev_to_drm(adev)->vblank_disable_immediate = true;
 
-	r = drm_vblank_init(adev_to_drm(adev), adev->mode_info.num_crtc);
+	r = drm_vblank_init(adev_to_drm(adev));
 	if (r)
 		return r;
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 38cffe1279896..07b83584c7a9d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -893,7 +893,7 @@  static int amdgpu_dm_init(struct amdgpu_device *adev)
 	adev_to_drm(adev)->mode_config.cursor_width = adev->dm.dc->caps.max_cursor_size;
 	adev_to_drm(adev)->mode_config.cursor_height = adev->dm.dc->caps.max_cursor_size;
 
-	if (drm_vblank_init(adev_to_drm(adev), adev->dm.display_indexes_num)) {
+	if (drm_vblank_init(adev_to_drm(adev))) {
 		drm_err(adev_to_drm(adev),
 		"failed to initialize vblank for display support.\n");
 		goto error;
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index faa8b041373a7..02e7037c9b46e 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -297,7 +297,7 @@  struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
 	if (err)
 		goto cleanup_mode_config;
 
-	err = drm_vblank_init(drm, kms->n_crtcs);
+	err = drm_vblank_init(drm);
 	if (err)
 		goto cleanup_mode_config;
 
diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
index 81d45f2dd6a70..f353406d0f7fd 100644
--- a/drivers/gpu/drm/arm/hdlcd_drv.c
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -275,7 +275,7 @@  static int hdlcd_drm_bind(struct device *dev)
 
 	pm_runtime_enable(dev);
 
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret < 0) {
 		DRM_ERROR("failed to initialise vblank\n");
 		goto err_vblank;
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index 23fa942ae4bbe..96df6790444fe 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -849,7 +849,7 @@  static int malidp_bind(struct device *dev)
 	if (ret < 0)
 		goto irq_init_fail;
 
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret < 0) {
 		DRM_ERROR("failed to initialise vblank\n");
 		goto vblank_fail;
diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
index cae25ad66c749..3638b13d0cee9 100644
--- a/drivers/gpu/drm/armada/armada_drv.c
+++ b/drivers/gpu/drm/armada/armada_drv.c
@@ -122,7 +122,7 @@  static int armada_drm_bind(struct device *dev)
 	if (ret)
 		goto err_kms;
 
-	ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
+	ret = drm_vblank_init(&priv->drm);
 	if (ret)
 		goto err_comp;
 
diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
index d4577663a1f0e..ba78695d1015c 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
@@ -205,7 +205,7 @@  static int aspeed_gfx_load(struct drm_device *drm)
 	if (ret < 0)
 		return ret;
 
-	ret = drm_vblank_init(drm, 1);
+	ret = drm_vblank_init(drm);
 	if (ret < 0) {
 		dev_err(drm->dev, "Failed to initialise vblank\n");
 		return ret;
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index 2f41bce574dc5..1a5f273527bb4 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -867,7 +867,7 @@  static int atmel_hlcdc_dc_load(struct drm_device *dev)
 
 	pm_runtime_enable(dev->dev);
 
-	ret = drm_vblank_init(dev, 1);
+	ret = drm_vblank_init(dev);
 	if (ret < 0) {
 		drm_err(dev, "failed to initialize vblank\n");
 		goto err_periph_clk_disable;
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index c6f61a39b5d16..17283e8920378 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -536,18 +536,18 @@  static void drm_vblank_init_release(struct drm_device *dev, void *ptr)
 /**
  * drm_vblank_init - initialize vblank support
  * @dev: DRM device
- * @num_crtcs: number of CRTCs supported by @dev
  *
- * This function initializes vblank support for @num_crtcs display pipelines.
+ * This function initializes vblank support for display pipelines.
  * Cleanup is handled automatically through a cleanup function added with
  * drmm_add_action_or_reset().
  *
  * Returns:
  * Zero on success or a negative error code on failure.
  */
-int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
+int drm_vblank_init(struct drm_device *dev)
 {
 	int ret;
+	unsigned int num_crtcs = dev->mode_config.num_crtc;
 	unsigned int i;
 
 	spin_lock_init(&dev->vbl_lock);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 9ee30086879f9..42c6053cdc9ec 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -273,7 +273,7 @@  static int exynos_drm_bind(struct device *dev)
 	if (ret)
 		goto err_mode_config_cleanup;
 
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret)
 		goto err_unbind_all;
 
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index 3bbfc1b56a655..39768565b437e 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -122,7 +122,7 @@  static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
 			return dev_err_probe(dev->dev, ret, "failed to enable pixclk\n");
 	}
 
-	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	ret = drm_vblank_init(dev);
 	if (ret < 0) {
 		dev_err(dev->dev, "failed to initialize vblank\n");
 		goto done_vblank;
diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
index d17cb5b4a4bf2..bef32d29046df 100644
--- a/drivers/gpu/drm/gma500/psb_drv.c
+++ b/drivers/gpu/drm/gma500/psb_drv.c
@@ -364,7 +364,7 @@  static int psb_driver_load(struct drm_device *dev, unsigned long flags)
 	acpi_video_register();
 
 	/* Setup vertical blanking handling */
-	ret = drm_vblank_init(dev, dev_priv->num_pipe);
+	ret = drm_vblank_init(dev);
 	if (ret)
 		goto out_err;
 
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
index 4d85c89f3f882..8f622732830e6 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
@@ -398,7 +398,7 @@  static int hibmc_load(struct drm_device *dev)
 	if (ret)
 		goto err;
 
-	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	ret = drm_vblank_init(dev);
 	if (ret) {
 		drm_err(dev, "failed to initialize vblank: %d\n", ret);
 		goto err;
diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
index 8a11c2df5b886..617d8884ef649 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
@@ -181,7 +181,7 @@  static int kirin_drm_kms_init(struct drm_device *dev,
 	}
 
 	/* vblank init */
-	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	ret = drm_vblank_init(dev);
 	if (ret) {
 		DRM_ERROR("failed to initialize vblank.\n");
 		goto err_unbind_all;
diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
index 1855749c1e41f..99833f5ce3610 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
@@ -330,7 +330,7 @@  int hv_drm_mode_config_init(struct hv_drm_device *hv)
 		return ret;
 	}
 
-	ret = drm_vblank_init(dev, 1);
+	ret = drm_vblank_init(dev);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
index bb5301b90231a..501a4bc9dfd50 100644
--- a/drivers/gpu/drm/i915/display/intel_display_driver.c
+++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
@@ -217,8 +217,7 @@  int intel_display_driver_probe_noirq(struct intel_display *display)
 	intel_bw_init_hw(display);
 
 	if (HAS_DISPLAY(display)) {
-		ret = drm_vblank_init(display->drm,
-				      INTEL_NUM_PIPES(display));
+		ret = drm_vblank_init(display->drm);
 		if (ret)
 			goto cleanup_opregion;
 	}
diff --git a/drivers/gpu/drm/imx/dc/dc-kms.c b/drivers/gpu/drm/imx/dc/dc-kms.c
index 0f8cfaf4c4d15..fbff307c87240 100644
--- a/drivers/gpu/drm/imx/dc/dc-kms.c
+++ b/drivers/gpu/drm/imx/dc/dc-kms.c
@@ -118,7 +118,7 @@  int dc_kms_init(struct dc_drm_device *dc_drm)
 			return ret;
 	}
 
-	ret = drm_vblank_init(drm, DC_DISPLAYS);
+	ret = drm_vblank_init(drm);
 	if (ret) {
 		dev_err(drm->dev, "failed to init vblank support: %d\n", ret);
 		return ret;
diff --git a/drivers/gpu/drm/imx/dcss/dcss-kms.c b/drivers/gpu/drm/imx/dcss/dcss-kms.c
index 7c5a6e2bc89ac..d3b9d69254273 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-kms.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-kms.c
@@ -129,7 +129,7 @@  struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
 
 	dcss_kms_mode_config_init(kms);
 
-	ret = drm_vblank_init(drm, 1);
+	ret = drm_vblank_init(drm);
 	if (ret)
 		goto cleanup_mode_config;
 
diff --git a/drivers/gpu/drm/imx/ipuv3/imx-drm-core.c b/drivers/gpu/drm/imx/ipuv3/imx-drm-core.c
index 51a0ec0432484..53ea896d53353 100644
--- a/drivers/gpu/drm/imx/ipuv3/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/ipuv3/imx-drm-core.c
@@ -233,7 +233,7 @@  static int imx_drm_bind(struct device *dev)
 	if (ret)
 		goto err_kms;
 
-	ret = drm_vblank_init(drm, MAX_CRTC);
+	ret = drm_vblank_init(drm);
 	if (ret)
 		goto err_kms;
 
diff --git a/drivers/gpu/drm/imx/lcdc/imx-lcdc.c b/drivers/gpu/drm/imx/lcdc/imx-lcdc.c
index c67fe80b8115e..cc2a2c386730a 100644
--- a/drivers/gpu/drm/imx/lcdc/imx-lcdc.c
+++ b/drivers/gpu/drm/imx/lcdc/imx-lcdc.c
@@ -435,7 +435,7 @@  static int imx_lcdc_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return dev_err_probe(drm->dev, ret, "Cannot setup simple display pipe\n");
 
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret < 0)
 		return dev_err_probe(drm->dev, ret, "Failed to initialize vblank\n");
 
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index 738a80b2550ff..4e17f5707e708 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -1348,7 +1348,7 @@  static int ingenic_drm_bind(struct device *dev, bool has_components)
 		goto err_drvdata;
 	}
 
-	ret = drm_vblank_init(drm, 1);
+	ret = drm_vblank_init(drm);
 	if (ret) {
 		dev_err(dev, "Failed calling drm_vblank_init()\n");
 		goto err_drvdata;
diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index 7c2eb1152fc2f..6026702fa31f9 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -191,7 +191,7 @@  static int kmb_setup_mode_config(struct drm_device *drm)
 	ret = kmb_dsi_encoder_init(drm, kmb->kmb_dsi);
 	/* Set the CRTC's port so that the encoder component can find it */
 	kmb->crtc.port = of_graph_get_port_by_id(drm->dev->of_node, 0);
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret < 0) {
 		drm_err(drm, "failed to initialize vblank\n");
 		pm_runtime_disable(drm->dev);
diff --git a/drivers/gpu/drm/logicvc/logicvc_mode.c b/drivers/gpu/drm/logicvc/logicvc_mode.c
index 3cf04b70bd271..9b67f12f32757 100644
--- a/drivers/gpu/drm/logicvc/logicvc_mode.c
+++ b/drivers/gpu/drm/logicvc/logicvc_mode.c
@@ -36,7 +36,7 @@  int logicvc_mode_init(struct logicvc_drm *logicvc)
 	uint32_t preferred_depth;
 	int ret;
 
-	ret = drm_vblank_init(drm_dev, mode_config->num_crtc);
+	ret = drm_vblank_init(drm_dev);
 	if (ret) {
 		drm_err(drm_dev, "Failed to initialize vblank\n");
 		return ret;
diff --git a/drivers/gpu/drm/loongson/lsdc_drv.c b/drivers/gpu/drm/loongson/lsdc_drv.c
index 3fd828d23271c..19a7e98e6cd04 100644
--- a/drivers/gpu/drm/loongson/lsdc_drv.c
+++ b/drivers/gpu/drm/loongson/lsdc_drv.c
@@ -296,7 +296,7 @@  static int lsdc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	drmm_kms_helper_poll_init(ddev);
 
 	if (loongson_vblank) {
-		ret = drm_vblank_init(ddev, descp->num_of_crtc);
+		ret = drm_vblank_init(ddev);
 		if (ret)
 			return ret;
 
diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
index 53275b575f0cb..f94750d93fd55 100644
--- a/drivers/gpu/drm/mcde/mcde_drv.c
+++ b/drivers/gpu/drm/mcde/mcde_drv.c
@@ -174,7 +174,7 @@  static int mcde_modeset_init(struct drm_device *drm)
 	mode_config->min_height = 1;
 	mode_config->max_height = 1080;
 
-	ret = drm_vblank_init(drm, 1);
+	ret = drm_vblank_init(drm);
 	if (ret) {
 		dev_err(drm->dev, "failed to init vblank\n");
 		return ret;
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index c86a3f54f35bc..40b3877350fd9 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -574,7 +574,7 @@  static int mtk_drm_kms_init(struct drm_device *drm)
 	 */
 	dma_set_max_seg_size(dma_dev, UINT_MAX);
 
-	ret = drm_vblank_init(drm, MAX_CRTC);
+	ret = drm_vblank_init(drm);
 	if (ret < 0)
 		goto err_component_unbind;
 
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 49ff9f1f16d32..d87a91135ecb3 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -262,7 +262,7 @@  static int meson_drv_bind_master(struct device *dev, bool has_components)
 
 	priv->vsync_irq = platform_get_irq(pdev, 0);
 
-	ret = drm_vblank_init(drm, 1);
+	ret = drm_vblank_init(drm);
 	if (ret)
 		goto free_canvas_vd1_2;
 
diff --git a/drivers/gpu/drm/msm/msm_kms.c b/drivers/gpu/drm/msm/msm_kms.c
index e5d0ea6294484..23f0f2a25ea68 100644
--- a/drivers/gpu/drm/msm/msm_kms.c
+++ b/drivers/gpu/drm/msm/msm_kms.c
@@ -317,7 +317,7 @@  int msm_drm_kms_init(struct device *dev, const struct drm_driver *drv)
 		sched_set_fifo(ev_thread->worker->task);
 	}
 
-	ret = drm_vblank_init(ddev, ddev->mode_config.num_crtc);
+	ret = drm_vblank_init(ddev);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dev, "failed to initialize vblank\n");
 		goto err_msm_uninit;
diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index e2173c4d6fc28..7fa1591a74bdd 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -175,7 +175,7 @@  static int lcdif_load(struct drm_device *drm)
 		return ret;
 	}
 
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret < 0) {
 		dev_err(drm->dev, "Failed to initialise vblank\n");
 		return ret;
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 8b4a500347fbd..87d38a84ed169 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -257,7 +257,7 @@  static int mxsfb_load(struct drm_device *drm,
 		goto err_vblank;
 	}
 
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret < 0) {
 		dev_err(drm->dev, "Failed to initialise vblank\n");
 		goto err_vblank;
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index d71dcfc6ee66b..9305876bdad33 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -713,7 +713,7 @@  nouveau_display_create(struct drm_device *dev)
 	drm_mode_config_reset(dev);
 
 	if (dev->mode_config.num_crtc) {
-		ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+		ret = drm_vblank_init(dev);
 		if (ret)
 			goto vblank_err;
 
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 92d6a1f9c0a1a..aad57533780cd 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -731,7 +731,7 @@  static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 	}
 
 	/* Initialize vblank handling, start with all CRTCs disabled. */
-	ret = drm_vblank_init(ddev, priv->num_pipes);
+	ret = drm_vblank_init(ddev);
 	if (ret) {
 		dev_err(priv->dev, "could not init vblank\n");
 		goto err_cleanup_modeset;
diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
index 8ec659b3c08eb..e20a63ad1a0e1 100644
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -175,7 +175,7 @@  static int pl111_modeset_init(struct drm_device *dev)
 		return ret;
 
 	if (!priv->variant->broken_vblank) {
-		ret = drm_vblank_init(dev, 1);
+		ret = drm_vblank_init(dev);
 		if (ret != 0) {
 			drm_err(dev, "Failed to init vblank\n");
 			goto out_bridge;
diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 7f4178800afd7..0ed93be0439f1 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -1304,7 +1304,7 @@  int qxl_modeset_init(struct qxl_device *qdev)
 
 	qxl_display_read_client_monitors_config(qdev);
 
-	ret = drm_vblank_init(&qdev->ddev, qxl_num_crtc);
+	ret = drm_vblank_init(&qdev->ddev);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 839d619e5602b..e6880d3f665ee 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -314,7 +314,7 @@  int radeon_irq_kms_init(struct radeon_device *rdev)
 	/* Disable vblank irqs aggressively for power-saving */
 	rdev_to_drm(rdev)->vblank_disable_immediate = true;
 
-	r = drm_vblank_init(rdev_to_drm(rdev), rdev->num_crtc);
+	r = drm_vblank_init(rdev_to_drm(rdev));
 	if (r) {
 		return r;
 	}
diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
index 9228a7ad0dfa4..c9e29da53d056 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
@@ -888,7 +888,7 @@  int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 	 * Initialize vertical blanking interrupts handling. Start with vblank
 	 * disabled for all CRTCs.
 	 */
-	ret = drm_vblank_init(dev, rcdu->num_crtcs);
+	ret = drm_vblank_init(dev);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_kms.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_kms.c
index 87f171145a230..497f3891c586a 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_kms.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_kms.c
@@ -430,7 +430,7 @@  int rzg2l_du_modeset_init(struct rzg2l_du_device *rcdu)
 	 * Initialize vertical blanking interrupts handling. Start with vblank
 	 * disabled for all CRTCs.
 	 */
-	ret = drm_vblank_init(dev, rcdu->num_crtcs);
+	ret = drm_vblank_init(dev);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
index 2f31822b22458..713a1abb364b9 100644
--- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
+++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
@@ -228,7 +228,7 @@  static int shmob_drm_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = drm_vblank_init(ddev, 1);
+	ret = drm_vblank_init(ddev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to initialize vblank\n");
 		return ret;
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 3099408e9d050..6e14c3832abff 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -186,7 +186,7 @@  static int rockchip_drm_bind(struct device *dev)
 	if (ret)
 		goto err_unbind_all;
 
-	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
+	ret = drm_vblank_init(drm_dev);
 	if (ret)
 		goto err_iommu_cleanup;
 
diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
index c2fd5380a834f..a49247a6cc25d 100644
--- a/drivers/gpu/drm/sprd/sprd_drm.c
+++ b/drivers/gpu/drm/sprd/sprd_drm.c
@@ -89,7 +89,7 @@  static int sprd_drm_bind(struct device *dev)
 	}
 
 	/* vblank init */
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret) {
 		drm_err(drm, "failed to initialize vblank.\n");
 		goto err_unbind_all;
diff --git a/drivers/gpu/drm/sti/sti_compositor.c b/drivers/gpu/drm/sti/sti_compositor.c
index 8c529b0cca8b4..5478826aeb420 100644
--- a/drivers/gpu/drm/sti/sti_compositor.c
+++ b/drivers/gpu/drm/sti/sti_compositor.c
@@ -145,7 +145,7 @@  static int sti_compositor_bind(struct device *dev,
 		}
 	}
 
-	drm_vblank_init(drm_dev, crtc_id);
+	drm_vblank_init(drm_dev);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 8818dcf98da79..1e8ac7bbbea5c 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -2076,7 +2076,7 @@  int ltdc_load(struct drm_device *ddev)
 		goto err;
 	}
 
-	ret = drm_vblank_init(ddev, NB_CRTC);
+	ret = drm_vblank_init(ddev);
 	if (ret) {
 		drm_err(ddev, "Failed calling drm_vblank_init()\n");
 		goto err;
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index e9baca360160b..b74ab1bcb41ee 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -95,7 +95,7 @@  static int sun4i_drv_bind(struct device *dev)
 	}
 
 	/* drm_vblank_init calls kcalloc, which can fail */
-	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	ret = drm_vblank_init(drm);
 	if (ret)
 		goto unbind_all;
 
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 324480c87fb1f..d5fe8f35107e9 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1241,7 +1241,7 @@  static int host1x_drm_probe(struct host1x_device *dev)
 	/* syncpoints are used for full 32-bit hardware VBLANK counters */
 	drm->max_vblank_count = 0xffffffff;
 
-	err = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	err = drm_vblank_init(drm);
 	if (err < 0)
 		goto hub;
 
diff --git a/drivers/gpu/drm/tidss/tidss_kms.c b/drivers/gpu/drm/tidss/tidss_kms.c
index 70c14c3be10d5..8b45ac6a5e704 100644
--- a/drivers/gpu/drm/tidss/tidss_kms.c
+++ b/drivers/gpu/drm/tidss/tidss_kms.c
@@ -289,7 +289,7 @@  int tidss_modeset_init(struct tidss_device *tidss)
 	if (ret)
 		return ret;
 
-	ret = drm_vblank_init(ddev, tidss->num_crtcs);
+	ret = drm_vblank_init(ddev);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 1d6c9a423a410..37508fcd261c0 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -405,7 +405,7 @@  static int tilcdc_pdev_probe(struct platform_device *pdev)
 		goto unregister_cpufreq_notif;
 	}
 
-	ret = drm_vblank_init(ddev, 1);
+	ret = drm_vblank_init(ddev);
 	if (ret < 0) {
 		drm_err(ddev, "failed to initialize vblank\n");
 		goto unregister_cpufreq_notif;
diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
index e2d957e51505c..36196682ace2f 100644
--- a/drivers/gpu/drm/tiny/bochs.c
+++ b/drivers/gpu/drm/tiny/bochs.c
@@ -677,7 +677,7 @@  static int bochs_kms_init(struct bochs_device *bochs)
 	drm_connector_attach_edid_property(connector);
 	drm_connector_attach_encoder(connector, encoder);
 
-	ret = drm_vblank_init(dev, 1);
+	ret = drm_vblank_init(dev);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/tiny/cirrus-qemu.c b/drivers/gpu/drm/tiny/cirrus-qemu.c
index 075221b431d37..d6730763acade 100644
--- a/drivers/gpu/drm/tiny/cirrus-qemu.c
+++ b/drivers/gpu/drm/tiny/cirrus-qemu.c
@@ -501,7 +501,7 @@  static int cirrus_pipe_init(struct cirrus_device *cirrus)
 	if (ret)
 		return ret;
 
-	ret = drm_vblank_init(dev, 1);
+	ret = drm_vblank_init(dev);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/tve200/tve200_drv.c b/drivers/gpu/drm/tve200/tve200_drv.c
index 8d0e7c7c82e84..f41748436ac5a 100644
--- a/drivers/gpu/drm/tve200/tve200_drv.c
+++ b/drivers/gpu/drm/tve200/tve200_drv.c
@@ -120,7 +120,7 @@  static int tve200_modeset_init(struct drm_device *dev)
 	dev_info(dev->dev, "attached to panel %s\n",
 		 dev_name(panel->dev));
 
-	ret = drm_vblank_init(dev, 1);
+	ret = drm_vblank_init(dev);
 	if (ret) {
 		dev_err(dev->dev, "failed to init vblank\n");
 		goto out_bridge;
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index 8f08567d28fc6..2c1c479494b12 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -1151,7 +1151,7 @@  int vc4_kms_load(struct drm_device *dev)
 	/* Set support for vblank irq fast disable, before drm_vblank_init() */
 	dev->vblank_disable_immediate = true;
 
-	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	ret = drm_vblank_init(dev);
 	if (ret < 0) {
 		dev_err(dev->dev, "failed to initialize vblank\n");
 		return ret;
diff --git a/drivers/gpu/drm/verisilicon/vs_drm.c b/drivers/gpu/drm/verisilicon/vs_drm.c
index fd259d53f49f1..3e4944eb745c4 100644
--- a/drivers/gpu/drm/verisilicon/vs_drm.c
+++ b/drivers/gpu/drm/verisilicon/vs_drm.c
@@ -121,7 +121,7 @@  int vs_drm_initialize(struct vs_dc *dc, struct platform_device *pdev)
 		vdrm->crtcs[i] = crtc;
 	}
 
-	ret = drm_vblank_init(drm, dc->identity.display_count);
+	ret = drm_vblank_init(drm);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index 44ffffec550fd..971c5a7424b37 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -381,7 +381,7 @@  int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
 	for (i = 0 ; i < vgdev->num_scanouts; ++i)
 		vgdev_output_init(vgdev, i);
 
-	ret = drm_vblank_init(vgdev->ddev, vgdev->num_scanouts);
+	ret = drm_vblank_init(vgdev->ddev);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 5a640b531d88f..5a830cee7fe9b 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -192,8 +192,7 @@  int vkms_create(struct vkms_config *config)
 		goto out_devres;
 	}
 
-	ret = drm_vblank_init(&vkms_device->drm,
-			      vkms_config_get_num_crtcs(config));
+	ret = drm_vblank_init(&vkms_device->drm);
 	if (ret) {
 		DRM_ERROR("Failed to vblank\n");
 		goto out_devres;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c
index 7b8163b5e5014..22601060727fb 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c
@@ -212,7 +212,7 @@  vmw_vkms_init(struct vmw_private *vmw)
 
 	ret = kstrtobool(buffer, &vmw->vkms_enabled);
 	if (!ret && vmw->vkms_enabled) {
-		ret = drm_vblank_init(&vmw->drm, VMWGFX_NUM_DISPLAY_UNITS);
+		ret = drm_vblank_init(&vmw->drm);
 		vmw->vkms_enabled = (ret == 0);
 	}
 
diff --git a/drivers/gpu/drm/xlnx/zynqmp_kms.c b/drivers/gpu/drm/xlnx/zynqmp_kms.c
index d5f9224505655..c5209df46afe5 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_kms.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_kms.c
@@ -504,7 +504,7 @@  int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
 	drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH;
 	drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT;
 
-	ret = drm_vblank_init(drm, 1);
+	ret = drm_vblank_init(drm);
 	if (ret)
 		return ret;
 
diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
index 2fcef9c0f5b1b..d78f40d3a85be 100644
--- a/include/drm/drm_vblank.h
+++ b/include/drm/drm_vblank.h
@@ -285,7 +285,7 @@  struct drm_vblank_crtc {
 };
 
 struct drm_vblank_crtc *drm_crtc_vblank_crtc(struct drm_crtc *crtc);
-int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
+int drm_vblank_init(struct drm_device *dev);
 bool drm_dev_has_vblank(const struct drm_device *dev);
 u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
 u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,