openwrt/target/linux/bcm27xx/patches-6.6/950-0585-drm-vc4-Introduce-generation-number-enum.patch

From 6546211b121bf4a931c9bcffb879dfed1911b8b1 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Fri, 17 Feb 2023 13:07:36 +0100
Subject: [PATCH 0585/1085] drm/vc4: Introduce generation number enum

With the introduction of the BCM2712 support, we will get yet another
generation of display engine to support.

The binary check of whether it's VC5 or not thus doesn't work anymore,
especially since some parts of the driver will have changed with BCM2711,
and some others with BCM2712.

Let's introduce an enum to store the generation the driver is running
on, which should provide more flexibility.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/tests/vc4_mock.c       | 12 +++---
 drivers/gpu/drm/vc4/vc4_bo.c               | 28 ++++++------
 drivers/gpu/drm/vc4/vc4_crtc.c             | 14 +++---
 drivers/gpu/drm/vc4/vc4_drv.c              | 22 ++++++----
 drivers/gpu/drm/vc4/vc4_drv.h              |  7 ++-
 drivers/gpu/drm/vc4/vc4_gem.c              | 24 +++++------
 drivers/gpu/drm/vc4/vc4_hdmi.c             |  2 +-
 drivers/gpu/drm/vc4/vc4_hvs.c              | 50 ++++++++++++----------
 drivers/gpu/drm/vc4/vc4_irq.c              | 10 ++---
 drivers/gpu/drm/vc4/vc4_kms.c              | 14 +++---
 drivers/gpu/drm/vc4/vc4_perfmon.c          | 20 ++++-----
 drivers/gpu/drm/vc4/vc4_plane.c            | 12 +++---
 drivers/gpu/drm/vc4/vc4_render_cl.c        |  2 +-
 drivers/gpu/drm/vc4/vc4_v3d.c              | 10 ++---
 drivers/gpu/drm/vc4/vc4_validate.c         |  8 ++--
 drivers/gpu/drm/vc4/vc4_validate_shaders.c |  2 +-
 16 files changed, 126 insertions(+), 111 deletions(-)

--- a/drivers/gpu/drm/vc4/tests/vc4_mock.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_mock.c
@@ -160,11 +160,11 @@ static void kunit_action_drm_dev_unregis
 	drm_dev_unregister(drm);
 }
 
-static struct vc4_dev *__mock_device(struct kunit *test, bool is_vc5)
+static struct vc4_dev *__mock_device(struct kunit *test, enum vc4_gen gen)
 {
 	struct drm_device *drm;
-	const struct drm_driver *drv = is_vc5 ? &vc5_drm_driver : &vc4_drm_driver;
-	const struct vc4_mock_desc *desc = is_vc5 ? &vc5_mock : &vc4_mock;
+	const struct drm_driver *drv = (gen == VC4_GEN_5) ? &vc5_drm_driver : &vc4_drm_driver;
+	const struct vc4_mock_desc *desc = (gen == VC4_GEN_5) ? &vc5_mock : &vc4_mock;
 	struct vc4_dev *vc4;
 	struct device *dev;
 	int ret;
@@ -178,7 +178,7 @@ static struct vc4_dev *__mock_device(str
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4);
 
 	vc4->dev = dev;
-	vc4->is_vc5 = is_vc5;
+	vc4->gen = gen;
 
 	vc4->hvs = __vc4_hvs_alloc(vc4, NULL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4->hvs);
@@ -203,10 +203,10 @@ static struct vc4_dev *__mock_device(str
 
 struct vc4_dev *vc4_mock_device(struct kunit *test)
 {
-	return __mock_device(test, false);
+	return __mock_device(test, VC4_GEN_4);
 }
 
 struct vc4_dev *vc5_mock_device(struct kunit *test)
 {
-	return __mock_device(test, true);
+	return __mock_device(test, VC4_GEN_5);
 }
--- a/drivers/gpu/drm/vc4/vc4_bo.c
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -251,7 +251,7 @@ void vc4_bo_add_to_purgeable_pool(struct
 {
 	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	mutex_lock(&vc4->purgeable.lock);
@@ -265,7 +265,7 @@ static void vc4_bo_remove_from_purgeable
 {
 	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	/* list_del_init() is used here because the caller might release
@@ -396,7 +396,7 @@ struct drm_gem_object *vc4_create_object
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct vc4_bo *bo;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return ERR_PTR(-ENODEV);
 
 	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
@@ -427,7 +427,7 @@ struct vc4_bo *vc4_bo_create(struct drm_
 	struct drm_gem_dma_object *dma_obj;
 	struct vc4_bo *bo;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return ERR_PTR(-ENODEV);
 
 	if (size == 0)
@@ -496,7 +496,7 @@ int vc4_bo_dumb_create(struct drm_file *
 	struct vc4_bo *bo = NULL;
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	ret = vc4_dumb_fixup_args(args);
@@ -622,7 +622,7 @@ int vc4_bo_inc_usecnt(struct vc4_bo *bo)
 	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	/* Fast path: if the BO is already retained by someone, no need to
@@ -661,7 +661,7 @@ void vc4_bo_dec_usecnt(struct vc4_bo *bo
 {
 	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	/* Fast path: if the BO is still retained by someone, no need to test
@@ -783,7 +783,7 @@ int vc4_create_bo_ioctl(struct drm_devic
 	struct vc4_bo *bo = NULL;
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	ret = vc4_grab_bin_bo(vc4, vc4file);
@@ -813,7 +813,7 @@ int vc4_mmap_bo_ioctl(struct drm_device
 	struct drm_vc4_mmap_bo *args = data;
 	struct drm_gem_object *gem_obj;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	gem_obj = drm_gem_object_lookup(file_priv, args->handle);
@@ -839,7 +839,7 @@ vc4_create_shader_bo_ioctl(struct drm_de
 	struct vc4_bo *bo = NULL;
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (args->size == 0)
@@ -918,7 +918,7 @@ int vc4_set_tiling_ioctl(struct drm_devi
 	struct vc4_bo *bo;
 	bool t_format;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (args->flags != 0)
@@ -964,7 +964,7 @@ int vc4_get_tiling_ioctl(struct drm_devi
 	struct drm_gem_object *gem_obj;
 	struct vc4_bo *bo;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (args->flags != 0 || args->modifier != 0)
@@ -1007,7 +1007,7 @@ int vc4_bo_cache_init(struct drm_device
 	int ret;
 	int i;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	/* Create the initial set of BO labels that the kernel will
@@ -1071,7 +1071,7 @@ int vc4_label_bo_ioctl(struct drm_device
 	struct drm_gem_object *gem_obj;
 	int ret = 0, label;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (!args->len)
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -264,7 +264,7 @@ static u32 vc4_get_fifo_full_level(struc
 		 * Removing 1 from the FIFO full level however
 		 * seems to completely remove that issue.
 		 */
-		if (!vc4->is_vc5)
+		if (vc4->gen == VC4_GEN_4)
 			return fifo_len_bytes - 3 * HVS_FIFO_LATENCY_PIX - 1;
 
 		return fifo_len_bytes - 3 * HVS_FIFO_LATENCY_PIX;
@@ -446,7 +446,7 @@ static void vc4_crtc_config_pv(struct dr
 	if (is_dsi)
 		CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
 
-	if (vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_5)
 		CRTC_WRITE(PV_MUX_CFG,
 			   VC4_SET_FIELD(PV_MUX_CFG_RGB_PIXEL_MUX_MODE_NO_SWAP,
 					 PV_MUX_CFG_RGB_PIXEL_MUX_MODE));
@@ -937,7 +937,7 @@ static int vc4_async_set_fence_cb(struct
 	struct dma_fence *fence;
 	int ret;
 
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 		struct vc4_bo *bo = to_vc4_bo(&dma_bo->base);
 
 		return vc4_queue_seqno_cb(dev, &flip_state->cb.seqno, bo->seqno,
@@ -1024,7 +1024,7 @@ static int vc4_async_page_flip(struct dr
 	struct vc4_bo *bo = to_vc4_bo(&dma_bo->base);
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	/*
@@ -1067,7 +1067,7 @@ int vc4_page_flip(struct drm_crtc *crtc,
 		struct drm_device *dev = crtc->dev;
 		struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-		if (vc4->is_vc5)
+		if (vc4->gen == VC4_GEN_5)
 			return vc5_async_page_flip(crtc, fb, event, flags);
 		else
 			return vc4_async_page_flip(crtc, fb, event, flags);
@@ -1356,13 +1356,13 @@ int __vc4_crtc_init(struct drm_device *d
 
 	drm_crtc_helper_add(crtc, crtc_helper_funcs);
 
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 		drm_mode_crtc_set_gamma_size(crtc, ARRAY_SIZE(vc4_crtc->lut_r));
 		drm_crtc_enable_color_mgmt(crtc, 0, false, crtc->gamma_size);
 	}
 
 
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 		/* We support CTM, but only for one CRTC at a time. It's therefore
 		 * implemented as private driver state in vc4_kms, not here.
 		 */
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -98,7 +98,7 @@ static int vc4_get_param_ioctl(struct dr
 	if (args->pad != 0)
 		return -EINVAL;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (!vc4->v3d)
@@ -147,7 +147,7 @@ static int vc4_open(struct drm_device *d
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct vc4_file *vc4file;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	vc4file = kzalloc(sizeof(*vc4file), GFP_KERNEL);
@@ -165,7 +165,7 @@ static void vc4_close(struct drm_device
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct vc4_file *vc4file = file->driver_priv;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	if (vc4file->bin_bo_used)
@@ -304,13 +304,17 @@ static int vc4_drm_bind(struct device *d
 	struct vc4_dev *vc4;
 	struct device_node *node;
 	struct drm_crtc *crtc;
-	bool is_vc5;
+	enum vc4_gen gen;
 	int ret = 0;
 
 	dev->coherent_dma_mask = DMA_BIT_MASK(32);
 
-	is_vc5 = of_device_is_compatible(dev->of_node, "brcm,bcm2711-vc5");
-	if (is_vc5)
+	if (of_device_is_compatible(dev->of_node, "brcm,bcm2711-vc5"))
+		gen = VC4_GEN_5;
+	else
+		gen = VC4_GEN_4;
+
+	if (gen == VC4_GEN_5)
 		driver = &vc5_drm_driver;
 	else
 		driver = &vc4_drm_driver;
@@ -328,13 +332,13 @@ static int vc4_drm_bind(struct device *d
 	vc4 = devm_drm_dev_alloc(dev, driver, struct vc4_dev, base);
 	if (IS_ERR(vc4))
 		return PTR_ERR(vc4);
-	vc4->is_vc5 = is_vc5;
+	vc4->gen = gen;
 	vc4->dev = dev;
 
 	drm = &vc4->base;
 	platform_set_drvdata(pdev, drm);
 
-	if (!is_vc5) {
+	if (gen == VC4_GEN_4) {
 		ret = drmm_mutex_init(drm, &vc4->bin_bo_lock);
 		if (ret)
 			return ret;
@@ -348,7 +352,7 @@ static int vc4_drm_bind(struct device *d
 	if (ret)
 		return ret;
 
-	if (!is_vc5) {
+	if (gen == VC4_GEN_4) {
 		ret = vc4_gem_init(drm);
 		if (ret)
 			return ret;
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -80,11 +80,16 @@ struct vc4_perfmon {
 	u64 counters[];
 };
 
+enum vc4_gen {
+	VC4_GEN_4,
+	VC4_GEN_5,
+};
+
 struct vc4_dev {
 	struct drm_device base;
 	struct device *dev;
 
-	bool is_vc5;
+	enum vc4_gen gen;
 
 	unsigned int irq;
 
--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -76,7 +76,7 @@ vc4_get_hang_state_ioctl(struct drm_devi
 	u32 i;
 	int ret = 0;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (!vc4->v3d) {
@@ -389,7 +389,7 @@ vc4_wait_for_seqno(struct drm_device *de
 	unsigned long timeout_expire;
 	DEFINE_WAIT(wait);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (vc4->finished_seqno >= seqno)
@@ -474,7 +474,7 @@ vc4_submit_next_bin_job(struct drm_devic
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct vc4_exec_info *exec;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 again:
@@ -522,7 +522,7 @@ vc4_submit_next_render_job(struct drm_de
 	if (!exec)
 		return;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	/* A previous RCL may have written to one of our textures, and
@@ -543,7 +543,7 @@ vc4_move_job_to_render(struct drm_device
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	bool was_empty = list_empty(&vc4->render_job_list);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	list_move_tail(&exec->head, &vc4->render_job_list);
@@ -970,7 +970,7 @@ vc4_job_handle_completed(struct vc4_dev
 	unsigned long irqflags;
 	struct vc4_seqno_cb *cb, *cb_temp;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	spin_lock_irqsave(&vc4->job_lock, irqflags);
@@ -1009,7 +1009,7 @@ int vc4_queue_seqno_cb(struct drm_device
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	unsigned long irqflags;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	cb->func = func;
@@ -1065,7 +1065,7 @@ vc4_wait_seqno_ioctl(struct drm_device *
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct drm_vc4_wait_seqno *args = data;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	return vc4_wait_for_seqno_ioctl_helper(dev, args->seqno,
@@ -1082,7 +1082,7 @@ vc4_wait_bo_ioctl(struct drm_device *dev
 	struct drm_gem_object *gem_obj;
 	struct vc4_bo *bo;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (args->pad != 0)
@@ -1131,7 +1131,7 @@ vc4_submit_cl_ioctl(struct drm_device *d
 				  args->shader_rec_size,
 				  args->bo_handle_count);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (!vc4->v3d) {
@@ -1268,7 +1268,7 @@ int vc4_gem_init(struct drm_device *dev)
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	vc4->dma_fence_context = dma_fence_context_alloc(1);
@@ -1327,7 +1327,7 @@ int vc4_gem_madvise_ioctl(struct drm_dev
 	struct vc4_bo *bo;
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	switch (args->madv) {
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -2586,7 +2586,7 @@ static int vc4_hdmi_audio_prepare(struct
 					     VC4_HDMI_AUDIO_PACKET_CEA_MASK);
 
 	/* Set the MAI threshold */
-	if (vc4->is_vc5)
+	if (vc4->gen >= VC4_GEN_5)
 		HDMI_WRITE(HDMI_MAI_THR,
 			VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICHIGH) |
 			VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICLOW) |
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -416,7 +416,7 @@ static void vc4_hvs_irq_enable_eof(const
 				   unsigned int channel)
 {
 	struct vc4_dev *vc4 = hvs->vc4;
-	u32 irq_mask = vc4->is_vc5 ?
+	u32 irq_mask = vc4->gen == VC4_GEN_5 ?
 		SCALER5_DISPCTRL_DSPEIEOF(channel) :
 		SCALER_DISPCTRL_DSPEIEOF(channel);
 
@@ -428,7 +428,7 @@ static void vc4_hvs_irq_clear_eof(const
 				  unsigned int channel)
 {
 	struct vc4_dev *vc4 = hvs->vc4;
-	u32 irq_mask = vc4->is_vc5 ?
+	u32 irq_mask = vc4->gen == VC4_GEN_5 ?
 		SCALER5_DISPCTRL_DSPEIEOF(channel) :
 		SCALER_DISPCTRL_DSPEIEOF(channel);
 
@@ -620,7 +620,7 @@ int vc4_hvs_get_fifo_from_output(struct
 	u32 reg;
 	int ret;
 
-	if (!vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_4)
 		return output;
 
 	/*
@@ -701,7 +701,7 @@ static int vc4_hvs_init_channel(struct v
 	dispctrl = SCALER_DISPCTRLX_ENABLE;
 	dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(chan));
 
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 		dispctrl |= VC4_SET_FIELD(mode->hdisplay,
 					  SCALER_DISPCTRLX_WIDTH) |
 			    VC4_SET_FIELD(mode->vdisplay,
@@ -732,7 +732,7 @@ static int vc4_hvs_init_channel(struct v
 	/* Reload the LUT, since the SRAMs would have been disabled if
 	 * all CRTCs had SCALER_DISPBKGND_GAMMA unset at once.
 	 */
-	if (!vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_4)
 		vc4_hvs_lut_load(hvs, vc4_crtc);
 	else
 		vc5_hvs_lut_load(hvs, vc4_crtc);
@@ -782,7 +782,7 @@ static int vc4_hvs_gamma_check(struct dr
 	struct drm_device *dev = crtc->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-	if (!vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_4)
 		return 0;
 
 	if (!crtc_state->color_mgmt_changed)
@@ -1036,7 +1036,7 @@ void vc4_hvs_atomic_flush(struct drm_crt
 		u32 dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(channel));
 
 		if (crtc->state->gamma_lut) {
-			if (!vc4->is_vc5) {
+			if (vc4->gen == VC4_GEN_4) {
 				vc4_hvs_update_gamma_lut(hvs, vc4_crtc);
 				dispbkgndx |= SCALER_DISPBKGND_GAMMA;
 			} else {
@@ -1053,7 +1053,7 @@ void vc4_hvs_atomic_flush(struct drm_crt
 			 * should already be disabling/enabling the pipeline
 			 * when gamma changes.
 			 */
-			if (!vc4->is_vc5)
+			if (vc4->gen == VC4_GEN_4)
 				dispbkgndx &= ~SCALER_DISPBKGND_GAMMA;
 		}
 		HVS_WRITE(SCALER_DISPBKGNDX(channel), dispbkgndx);
@@ -1069,7 +1069,8 @@ void vc4_hvs_atomic_flush(struct drm_crt
 
 void vc4_hvs_mask_underrun(struct vc4_hvs *hvs, int channel)
 {
-	struct drm_device *drm = &hvs->vc4->base;
+	struct vc4_dev *vc4 = hvs->vc4;
+	struct drm_device *drm = &vc4->base;
 	u32 dispctrl;
 	int idx;
 
@@ -1077,8 +1078,9 @@ void vc4_hvs_mask_underrun(struct vc4_hv
 		return;
 
 	dispctrl = HVS_READ(SCALER_DISPCTRL);
-	dispctrl &= ~(hvs->vc4->is_vc5 ? SCALER5_DISPCTRL_DSPEISLUR(channel) :
-					 SCALER_DISPCTRL_DSPEISLUR(channel));
+	dispctrl &= ~((vc4->gen == VC4_GEN_5) ?
+		      SCALER5_DISPCTRL_DSPEISLUR(channel) :
+		      SCALER_DISPCTRL_DSPEISLUR(channel));
 
 	HVS_WRITE(SCALER_DISPCTRL, dispctrl);
 
@@ -1087,7 +1089,8 @@ void vc4_hvs_mask_underrun(struct vc4_hv
 
 void vc4_hvs_unmask_underrun(struct vc4_hvs *hvs, int channel)
 {
-	struct drm_device *drm = &hvs->vc4->base;
+	struct vc4_dev *vc4 = hvs->vc4;
+	struct drm_device *drm = &vc4->base;
 	u32 dispctrl;
 	int idx;
 
@@ -1095,8 +1098,9 @@ void vc4_hvs_unmask_underrun(struct vc4_
 		return;
 
 	dispctrl = HVS_READ(SCALER_DISPCTRL);
-	dispctrl |= (hvs->vc4->is_vc5 ? SCALER5_DISPCTRL_DSPEISLUR(channel) :
-					SCALER_DISPCTRL_DSPEISLUR(channel));
+	dispctrl |= ((vc4->gen == VC4_GEN_5) ?
+		     SCALER5_DISPCTRL_DSPEISLUR(channel) :
+		     SCALER_DISPCTRL_DSPEISLUR(channel));
 
 	HVS_WRITE(SCALER_DISPSTAT,
 		  SCALER_DISPSTAT_EUFLOW(channel));
@@ -1139,8 +1143,10 @@ static irqreturn_t vc4_hvs_irq_handler(i
 	control = HVS_READ(SCALER_DISPCTRL);
 
 	for (channel = 0; channel < SCALER_CHANNELS_COUNT; channel++) {
-		dspeislur = vc4->is_vc5 ? SCALER5_DISPCTRL_DSPEISLUR(channel) :
-					  SCALER_DISPCTRL_DSPEISLUR(channel);
+		dspeislur = (vc4->gen == VC4_GEN_5) ?
+			SCALER5_DISPCTRL_DSPEISLUR(channel) :
+			SCALER_DISPCTRL_DSPEISLUR(channel);
+
 		/* Interrupt masking is not always honored, so check it here. */
 		if (status & SCALER_DISPSTAT_EUFLOW(channel) &&
 		    control & dspeislur) {
@@ -1176,7 +1182,7 @@ int vc4_hvs_debugfs_init(struct drm_mino
 	if (!vc4->hvs)
 		return -ENODEV;
 
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 		debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
 				    minor->debugfs_root,
 				    &vc4->load_tracker_enabled);
@@ -1225,7 +1231,7 @@ struct vc4_hvs *__vc4_hvs_alloc(struct v
 	 * between planes when they don't overlap on the screen, but
 	 * for now we just allocate globally.
 	 */
-	if (!vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_4)
 		/* 48k words of 2x12-bit pixels */
 		drm_mm_init(&hvs->lbm_mm, 0, 48 * 1024);
 	else
@@ -1259,7 +1265,7 @@ static int vc4_hvs_bind(struct device *d
 	hvs->regset.regs = hvs_regs;
 	hvs->regset.nregs = ARRAY_SIZE(hvs_regs);
 
-	if (vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_5) {
 		struct rpi_firmware *firmware;
 		struct device_node *node;
 		unsigned int max_rate;
@@ -1297,7 +1303,7 @@ static int vc4_hvs_bind(struct device *d
 		}
 	}
 
-	if (!vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_4)
 		hvs->dlist = hvs->regs + SCALER_DLIST_START;
 	else
 		hvs->dlist = hvs->regs + SCALER5_DLIST_START;
@@ -1338,7 +1344,7 @@ static int vc4_hvs_bind(struct device *d
 		    SCALER_DISPCTRL_DISPEIRQ(1) |
 		    SCALER_DISPCTRL_DISPEIRQ(2);
 
-	if (!vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_4)
 		dispctrl &= ~(SCALER_DISPCTRL_DMAEIRQ |
 			      SCALER_DISPCTRL_SLVWREIRQ |
 			      SCALER_DISPCTRL_SLVRDEIRQ |
@@ -1393,7 +1399,7 @@ static int vc4_hvs_bind(struct device *d
 
 	/* Recompute Composite Output Buffer (COB) allocations for the displays
 	 */
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 		/* The COB is 20736 pixels, or just over 10 lines at 2048 wide.
 		 * The bottom 2048 pixels are full 32bpp RGBA (intended for the
 		 * TXP composing RGBA to memory), whilst the remainder are only
--- a/drivers/gpu/drm/vc4/vc4_irq.c
+++ b/drivers/gpu/drm/vc4/vc4_irq.c
@@ -263,7 +263,7 @@ vc4_irq_enable(struct drm_device *dev)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	if (!vc4->v3d)
@@ -280,7 +280,7 @@ vc4_irq_disable(struct drm_device *dev)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	if (!vc4->v3d)
@@ -303,7 +303,7 @@ int vc4_irq_install(struct drm_device *d
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (irq == IRQ_NOTCONNECTED)
@@ -324,7 +324,7 @@ void vc4_irq_uninstall(struct drm_device
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	vc4_irq_disable(dev);
@@ -337,7 +337,7 @@ void vc4_irq_reset(struct drm_device *de
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	unsigned long irqflags;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	/* Acknowledge any stale IRQs. */
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -372,7 +372,7 @@ static void vc4_atomic_commit_tail(struc
 		old_hvs_state->fifo_state[channel].pending_commit = NULL;
 	}
 
-	if (vc4->is_vc5 && !vc4->firmware_kms) {
+	if (vc4->gen == VC4_GEN_5 && !vc4->firmware_kms) {
 		unsigned long state_rate = max(old_hvs_state->core_clock_rate,
 					       new_hvs_state->core_clock_rate);
 		unsigned long core_rate = clamp_t(unsigned long, state_rate,
@@ -392,7 +392,7 @@ static void vc4_atomic_commit_tail(struc
 	vc4_ctm_commit(vc4, state);
 
 	if (!vc4->firmware_kms) {
-		if (vc4->is_vc5)
+		if (vc4->gen == VC4_GEN_5)
 			vc5_hvs_pv_muxing_commit(vc4, state);
 		else
 			vc4_hvs_pv_muxing_commit(vc4, state);
@@ -411,7 +411,7 @@ static void vc4_atomic_commit_tail(struc
 
 	drm_atomic_helper_cleanup_planes(dev, state);
 
-	if (vc4->is_vc5 && !vc4->firmware_kms) {
+	if (vc4->gen == VC4_GEN_5 && !vc4->firmware_kms) {
 		unsigned long core_rate = min_t(unsigned long,
 						hvs->max_core_rate,
 						new_hvs_state->core_clock_rate);
@@ -476,7 +476,7 @@ static struct drm_framebuffer *vc4_fb_cr
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct drm_mode_fb_cmd2 mode_cmd_local;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return ERR_PTR(-ENODEV);
 
 	/* If the user didn't specify a modifier, use the
@@ -1059,7 +1059,7 @@ int vc4_kms_load(struct drm_device *dev)
 	 * the BCM2711, but the load tracker computations are used for
 	 * the core clock rate calculation.
 	 */
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 		/* Start with the load tracker enabled. Can be
 		 * disabled through the debugfs load_tracker file.
 		 */
@@ -1075,7 +1075,7 @@ int vc4_kms_load(struct drm_device *dev)
 		return ret;
 	}
 
-	if (vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_5) {
 		dev->mode_config.max_width = 7680;
 		dev->mode_config.max_height = 7680;
 	} else {
@@ -1083,7 +1083,7 @@ int vc4_kms_load(struct drm_device *dev)
 		dev->mode_config.max_height = 2048;
 	}
 
-	dev->mode_config.funcs = vc4->is_vc5 ? &vc5_mode_funcs : &vc4_mode_funcs;
+	dev->mode_config.funcs = (vc4->gen > VC4_GEN_4) ? &vc5_mode_funcs : &vc4_mode_funcs;
 	dev->mode_config.helper_private = &vc4_mode_config_helpers;
 	dev->mode_config.preferred_depth = 24;
 	dev->mode_config.async_page_flip = true;
--- a/drivers/gpu/drm/vc4/vc4_perfmon.c
+++ b/drivers/gpu/drm/vc4/vc4_perfmon.c
@@ -23,7 +23,7 @@ void vc4_perfmon_get(struct vc4_perfmon
 		return;
 
 	vc4 = perfmon->dev;
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	refcount_inc(&perfmon->refcnt);
@@ -37,7 +37,7 @@ void vc4_perfmon_put(struct vc4_perfmon
 		return;
 
 	vc4 = perfmon->dev;
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	if (refcount_dec_and_test(&perfmon->refcnt))
@@ -49,7 +49,7 @@ void vc4_perfmon_start(struct vc4_dev *v
 	unsigned int i;
 	u32 mask;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	if (WARN_ON_ONCE(!perfmon || vc4->active_perfmon))
@@ -69,7 +69,7 @@ void vc4_perfmon_stop(struct vc4_dev *vc
 {
 	unsigned int i;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	if (WARN_ON_ONCE(!vc4->active_perfmon ||
@@ -90,7 +90,7 @@ struct vc4_perfmon *vc4_perfmon_find(str
 	struct vc4_dev *vc4 = vc4file->dev;
 	struct vc4_perfmon *perfmon;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return NULL;
 
 	mutex_lock(&vc4file->perfmon.lock);
@@ -105,7 +105,7 @@ void vc4_perfmon_open_file(struct vc4_fi
 {
 	struct vc4_dev *vc4 = vc4file->dev;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	mutex_init(&vc4file->perfmon.lock);
@@ -131,7 +131,7 @@ void vc4_perfmon_close_file(struct vc4_f
 {
 	struct vc4_dev *vc4 = vc4file->dev;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	mutex_lock(&vc4file->perfmon.lock);
@@ -151,7 +151,7 @@ int vc4_perfmon_create_ioctl(struct drm_
 	unsigned int i;
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (!vc4->v3d) {
@@ -205,7 +205,7 @@ int vc4_perfmon_destroy_ioctl(struct drm
 	struct drm_vc4_perfmon_destroy *req = data;
 	struct vc4_perfmon *perfmon;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (!vc4->v3d) {
@@ -233,7 +233,7 @@ int vc4_perfmon_get_values_ioctl(struct
 	struct vc4_perfmon *perfmon;
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (!vc4->v3d) {
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -633,10 +633,10 @@ static u32 vc4_lbm_size(struct drm_plane
 	}
 
 	/* Align it to 64 or 128 (hvs5) bytes */
-	lbm = roundup(lbm, vc4->is_vc5 ? 128 : 64);
+	lbm = roundup(lbm, vc4->gen == VC4_GEN_5 ? 128 : 64);
 
 	/* Each "word" of the LBM memory contains 2 or 4 (hvs5) pixels */
-	lbm /= vc4->is_vc5 ? 4 : 2;
+	lbm /= vc4->gen == VC4_GEN_5 ? 4 : 2;
 
 	return lbm;
 }
@@ -760,7 +760,7 @@ static int vc4_plane_allocate_lbm(struct
 		ret = drm_mm_insert_node_generic(&vc4->hvs->lbm_mm,
 						 &vc4_state->lbm,
 						 lbm_size,
-						 vc4->is_vc5 ? 64 : 32,
+						 vc4->gen == VC4_GEN_5 ? 64 : 32,
 						 0, 0);
 		spin_unlock_irqrestore(&vc4->hvs->mm_lock, irqflags);
 
@@ -1141,7 +1141,7 @@ static int vc4_plane_mode_set(struct drm
 	mix_plane_alpha = state->alpha != DRM_BLEND_ALPHA_OPAQUE &&
 			  fb->format->has_alpha;
 
-	if (!vc4->is_vc5) {
+	if (vc4->gen == VC4_GEN_4) {
 	/* Control word */
 		vc4_dlist_write(vc4_state,
 				SCALER_CTL0_VALID |
@@ -1713,7 +1713,7 @@ struct drm_plane *vc4_plane_init(struct
 	};
 
 	for (i = 0; i < ARRAY_SIZE(hvs_formats); i++) {
-		if (!hvs_formats[i].hvs5_only || vc4->is_vc5) {
+		if (!hvs_formats[i].hvs5_only || vc4->gen == VC4_GEN_5) {
 			formats[num_formats] = hvs_formats[i].drm;
 			num_formats++;
 		}
@@ -1728,7 +1728,7 @@ struct drm_plane *vc4_plane_init(struct
 		return ERR_CAST(vc4_plane);
 	plane = &vc4_plane->base;
 
-	if (vc4->is_vc5)
+	if (vc4->gen == VC4_GEN_5)
 		drm_plane_helper_add(plane, &vc5_plane_helper_funcs);
 	else
 		drm_plane_helper_add(plane, &vc4_plane_helper_funcs);
--- a/drivers/gpu/drm/vc4/vc4_render_cl.c
+++ b/drivers/gpu/drm/vc4/vc4_render_cl.c
@@ -599,7 +599,7 @@ int vc4_get_rcl(struct drm_device *dev,
 	bool has_bin = args->bin_cl_size != 0;
 	int ret;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	if (args->min_x_tile > args->max_x_tile ||
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
@@ -127,7 +127,7 @@ static int vc4_v3d_debugfs_ident(struct
 int
 vc4_v3d_pm_get(struct vc4_dev *vc4)
 {
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	mutex_lock(&vc4->power_lock);
@@ -148,7 +148,7 @@ vc4_v3d_pm_get(struct vc4_dev *vc4)
 void
 vc4_v3d_pm_put(struct vc4_dev *vc4)
 {
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	mutex_lock(&vc4->power_lock);
@@ -178,7 +178,7 @@ int vc4_v3d_get_bin_slot(struct vc4_dev
 	uint64_t seqno = 0;
 	struct vc4_exec_info *exec;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 try_again:
@@ -325,7 +325,7 @@ int vc4_v3d_bin_bo_get(struct vc4_dev *v
 {
 	int ret = 0;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	mutex_lock(&vc4->bin_bo_lock);
@@ -360,7 +360,7 @@ static void bin_bo_release(struct kref *
 
 void vc4_v3d_bin_bo_put(struct vc4_dev *vc4)
 {
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return;
 
 	mutex_lock(&vc4->bin_bo_lock);
--- a/drivers/gpu/drm/vc4/vc4_validate.c
+++ b/drivers/gpu/drm/vc4/vc4_validate.c
@@ -109,7 +109,7 @@ vc4_use_bo(struct vc4_exec_info *exec, u
 	struct drm_gem_dma_object *obj;
 	struct vc4_bo *bo;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return NULL;
 
 	if (hindex >= exec->bo_count) {
@@ -169,7 +169,7 @@ vc4_check_tex_size(struct vc4_exec_info
 	uint32_t utile_w = utile_width(cpp);
 	uint32_t utile_h = utile_height(cpp);
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return false;
 
 	/* The shaded vertex format stores signed 12.4 fixed point
@@ -495,7 +495,7 @@ vc4_validate_bin_cl(struct drm_device *d
 	uint32_t dst_offset = 0;
 	uint32_t src_offset = 0;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	while (src_offset < len) {
@@ -942,7 +942,7 @@ vc4_validate_shader_recs(struct drm_devi
 	uint32_t i;
 	int ret = 0;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return -ENODEV;
 
 	for (i = 0; i < exec->shader_state_count; i++) {
--- a/drivers/gpu/drm/vc4/vc4_validate_shaders.c
+++ b/drivers/gpu/drm/vc4/vc4_validate_shaders.c
@@ -786,7 +786,7 @@ vc4_validate_shader(struct drm_gem_dma_o
 	struct vc4_validated_shader_info *validated_shader = NULL;
 	struct vc4_shader_validation_state validation_state;
 
-	if (WARN_ON_ONCE(vc4->is_vc5))
+	if (WARN_ON_ONCE(vc4->gen == VC4_GEN_5))
 		return NULL;
 
 	memset(&validation_state, 0, sizeof(validation_state));