drm/vc4: Consolidate Hardware Revision Check

A new generation of controller has been introduced with the
BCM2711/RaspberryPi4. This generation needs a bunch of quirks, and over
time we've piled on a number of checks in most parts of the drivers.

All these checks are performed several times, and are not always
consistent. Let's create a single, global, variable to hold it and use
it everywhere.
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220610115149.964394-3-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_crtc.c

@@ -256,7 +256,7 @@ static u32 vc4_get_fifo_full_level(struct vc4_crtc *vc4_crtc, u32 format)
 		 * Removing 1 from the FIFO full level however
 		 * seems to completely remove that issue.
 		 */
-		if (!vc4->hvs->hvs5)
+		if (!vc4->is_vc5)
 			return fifo_len_bytes - 3 * HVS_FIFO_LATENCY_PIX - 1;
 
 		return fifo_len_bytes - 3 * HVS_FIFO_LATENCY_PIX;
@@ -389,7 +389,7 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc, struct drm_encoder *encode
 	if (is_dsi)
 		CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
 
-	if (vc4->hvs->hvs5)
+	if (vc4->is_vc5)
 		CRTC_WRITE(PV_MUX_CFG,
 			   VC4_SET_FIELD(PV_MUX_CFG_RGB_PIXEL_MUX_MODE_NO_SWAP,
 					 PV_MUX_CFG_RGB_PIXEL_MUX_MODE));
@@ -1149,7 +1149,7 @@ int vc4_crtc_init(struct drm_device *drm, struct vc4_crtc *vc4_crtc,
 				  crtc_funcs, NULL);
 	drm_crtc_helper_add(crtc, crtc_helper_funcs);
 
-	if (!vc4->hvs->hvs5) {
+	if (!vc4->is_vc5) {
 		drm_mode_crtc_set_gamma_size(crtc, ARRAY_SIZE(vc4_crtc->lut_r));
 
 		drm_crtc_enable_color_mgmt(crtc, 0, false, crtc->gamma_size);

drivers/gpu/drm/vc4/vc4_drv.c

@@ -217,10 +217,13 @@ static int vc4_drm_bind(struct device *dev)
 	struct vc4_dev *vc4;
 	struct device_node *node;
 	struct drm_crtc *crtc;
+	bool is_vc5;
 	int ret = 0;
 
 	dev->coherent_dma_mask = DMA_BIT_MASK(32);
 
+	is_vc5 = of_device_is_compatible(dev->of_node, "brcm,bcm2711-vc5");
+
 	/* If VC4 V3D is missing, don't advertise render nodes. */
 	node = of_find_matching_node_and_match(NULL, vc4_v3d_dt_match, NULL);
 	if (!node || !of_device_is_available(node))
@@ -230,6 +233,7 @@ static int vc4_drm_bind(struct device *dev)
 	vc4 = devm_drm_dev_alloc(dev, &vc4_drm_driver, struct vc4_dev, base);
 	if (IS_ERR(vc4))
 		return PTR_ERR(vc4);
+	vc4->is_vc5 = is_vc5;
 
 	drm = &vc4->base;
 	platform_set_drvdata(pdev, drm);

drivers/gpu/drm/vc4/vc4_drv.h

@@ -74,6 +74,8 @@ struct vc4_perfmon {
 struct vc4_dev {
 	struct drm_device base;
 
+	bool is_vc5;
+
 	unsigned int irq;
 
 	struct vc4_hvs *hvs;
@@ -316,6 +318,7 @@ struct vc4_v3d {
 };
 
 struct vc4_hvs {
+	struct vc4_dev *vc4;
 	struct platform_device *pdev;
 	void __iomem *regs;
 	u32 __iomem *dlist;
@@ -333,9 +336,6 @@ struct vc4_hvs {
 	struct drm_mm_node mitchell_netravali_filter;
 
 	struct debugfs_regset32 regset;
-
-	/* HVS version 5 flag, therefore requires updated dlist structures */
-	bool hvs5;
 };
 
 struct vc4_plane {

drivers/gpu/drm/vc4/vc4_hvs.c

@@ -220,10 +220,11 @@ u8 vc4_hvs_get_fifo_frame_count(struct vc4_hvs *hvs, unsigned int fifo)
 
 int vc4_hvs_get_fifo_from_output(struct vc4_hvs *hvs, unsigned int output)
 {
+	struct vc4_dev *vc4 = hvs->vc4;
 	u32 reg;
 	int ret;
 
-	if (!hvs->hvs5)
+	if (!vc4->is_vc5)
 		return output;
 
 	switch (output) {
@@ -273,6 +274,7 @@ int vc4_hvs_get_fifo_from_output(struct vc4_hvs *hvs, unsigned int output)
 static int vc4_hvs_init_channel(struct vc4_hvs *hvs, struct drm_crtc *crtc,
 				struct drm_display_mode *mode, bool oneshot)
 {
+	struct vc4_dev *vc4 = hvs->vc4;
 	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 	struct vc4_crtc_state *vc4_crtc_state = to_vc4_crtc_state(crtc->state);
 	unsigned int chan = vc4_crtc_state->assigned_channel;
@@ -291,7 +293,7 @@ static int vc4_hvs_init_channel(struct vc4_hvs *hvs, struct drm_crtc *crtc,
 	 */
 	dispctrl = SCALER_DISPCTRLX_ENABLE;
 
-	if (!hvs->hvs5)
+	if (!vc4->is_vc5)
 		dispctrl |= VC4_SET_FIELD(mode->hdisplay,
 					  SCALER_DISPCTRLX_WIDTH) |
 			    VC4_SET_FIELD(mode->vdisplay,
@@ -312,7 +314,7 @@ static int vc4_hvs_init_channel(struct vc4_hvs *hvs, struct drm_crtc *crtc,
 
 	HVS_WRITE(SCALER_DISPBKGNDX(chan), dispbkgndx |
 		  SCALER_DISPBKGND_AUTOHS |
-		  ((!hvs->hvs5) ? SCALER_DISPBKGND_GAMMA : 0) |
+		  ((!vc4->is_vc5) ? SCALER_DISPBKGND_GAMMA : 0) |
 		  (interlace ? SCALER_DISPBKGND_INTERLACE : 0));
 
 	/* Reload the LUT, since the SRAMs would have been disabled if
@@ -617,11 +619,9 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
 	if (!hvs)
 		return -ENOMEM;
 
+	hvs->vc4 = vc4;
 	hvs->pdev = pdev;
 
-	if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm2711-hvs"))
-		hvs->hvs5 = true;
-
 	hvs->regs = vc4_ioremap_regs(pdev, 0);
 	if (IS_ERR(hvs->regs))
 		return PTR_ERR(hvs->regs);
@@ -630,7 +630,7 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
 	hvs->regset.regs = hvs_regs;
 	hvs->regset.nregs = ARRAY_SIZE(hvs_regs);
 
-	if (hvs->hvs5) {
+	if (vc4->is_vc5) {
 		hvs->core_clk = devm_clk_get(&pdev->dev, NULL);
 		if (IS_ERR(hvs->core_clk)) {
 			dev_err(&pdev->dev, "Couldn't get core clock\n");
@@ -644,7 +644,7 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
 		}
 	}
 
-	if (!hvs->hvs5)
+	if (!vc4->is_vc5)
 		hvs->dlist = hvs->regs + SCALER_DLIST_START;
 	else
 		hvs->dlist = hvs->regs + SCALER5_DLIST_START;
@@ -665,7 +665,7 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
 	 * between planes when they don't overlap on the screen, but
 	 * for now we just allocate globally.
 	 */
-	if (!hvs->hvs5)
+	if (!vc4->is_vc5)
 		/* 48k words of 2x12-bit pixels */
 		drm_mm_init(&hvs->lbm_mm, 0, 48 * 1024);
 	else

drivers/gpu/drm/vc4/vc4_kms.c

@@ -393,7 +393,7 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
 		old_hvs_state->fifo_state[channel].pending_commit = NULL;
 	}
 
-	if (vc4->hvs->hvs5) {
+	if (vc4->is_vc5) {
 		unsigned long state_rate = max(old_hvs_state->core_clock_rate,
 					       new_hvs_state->core_clock_rate);
 		unsigned long core_rate = max_t(unsigned long,
@@ -412,7 +412,7 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
 
 	vc4_ctm_commit(vc4, state);
 
-	if (vc4->hvs->hvs5)
+	if (vc4->is_vc5)
 		vc5_hvs_pv_muxing_commit(vc4, state);
 	else
 		vc4_hvs_pv_muxing_commit(vc4, state);
@@ -430,7 +430,7 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
 
 	drm_atomic_helper_cleanup_planes(dev, state);
 
-	if (vc4->hvs->hvs5) {
+	if (vc4->is_vc5) {
 		drm_dbg(dev, "Running the core clock at %lu Hz\n",
 			new_hvs_state->core_clock_rate);
 
@@ -1000,8 +1000,6 @@ static const struct drm_mode_config_funcs vc4_mode_funcs = {
 int vc4_kms_load(struct drm_device *dev)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	bool is_vc5 = of_device_is_compatible(dev->dev->of_node,
-					      "brcm,bcm2711-vc5");
 	int ret;
 
 	/*
@@ -1009,7 +1007,7 @@ int vc4_kms_load(struct drm_device *dev)
 	 * the BCM2711, but the load tracker computations are used for
 	 * the core clock rate calculation.
 	 */
-	if (!is_vc5) {
+	if (!vc4->is_vc5) {
 		/* Start with the load tracker enabled. Can be
 		 * disabled through the debugfs load_tracker file.
 		 */
@@ -1025,7 +1023,7 @@ int vc4_kms_load(struct drm_device *dev)
 		return ret;
 	}
 
-	if (is_vc5) {
+	if (vc4->is_vc5) {
 		dev->mode_config.max_width = 7680;
 		dev->mode_config.max_height = 7680;
 	} else {

drivers/gpu/drm/vc4/vc4_plane.c

@@ -489,10 +489,10 @@ static u32 vc4_lbm_size(struct drm_plane_state *state)
 	}
 
 	/* Align it to 64 or 128 (hvs5) bytes */
-	lbm = roundup(lbm, vc4->hvs->hvs5 ? 128 : 64);
+	lbm = roundup(lbm, vc4->is_vc5 ? 128 : 64);
 
 	/* Each "word" of the LBM memory contains 2 or 4 (hvs5) pixels */
-	lbm /= vc4->hvs->hvs5 ? 4 : 2;
+	lbm /= vc4->is_vc5 ? 4 : 2;
 
 	return lbm;
 }
@@ -608,7 +608,7 @@ static int vc4_plane_allocate_lbm(struct drm_plane_state *state)
 		ret = drm_mm_insert_node_generic(&vc4->hvs->lbm_mm,
 						 &vc4_state->lbm,
 						 lbm_size,
-						 vc4->hvs->hvs5 ? 64 : 32,
+						 vc4->is_vc5 ? 64 : 32,
 						 0, 0);
 		spin_unlock_irqrestore(&vc4->hvs->mm_lock, irqflags);
 
@@ -917,7 +917,7 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 	mix_plane_alpha = state->alpha != DRM_BLEND_ALPHA_OPAQUE &&
 			  fb->format->has_alpha;
 
-	if (!vc4->hvs->hvs5) {
+	if (!vc4->is_vc5) {
 	/* Control word */
 		vc4_dlist_write(vc4_state,
 				SCALER_CTL0_VALID |
@@ -1457,14 +1457,13 @@ static const struct drm_plane_funcs vc4_plane_funcs = {
 struct drm_plane *vc4_plane_init(struct drm_device *dev,
 				 enum drm_plane_type type)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct drm_plane *plane = NULL;
 	struct vc4_plane *vc4_plane;
 	u32 formats[ARRAY_SIZE(hvs_formats)];
 	int num_formats = 0;
 	int ret = 0;
 	unsigned i;
-	bool hvs5 = of_device_is_compatible(dev->dev->of_node,
-					    "brcm,bcm2711-vc5");
 	static const uint64_t modifiers[] = {
 		DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED,
 		DRM_FORMAT_MOD_BROADCOM_SAND128,
@@ -1480,7 +1479,7 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
 		return ERR_PTR(-ENOMEM);
 
 	for (i = 0; i < ARRAY_SIZE(hvs_formats); i++) {
-		if (!hvs_formats[i].hvs5_only || hvs5) {
+		if (!hvs_formats[i].hvs5_only || vc4->is_vc5) {
 			formats[num_formats] = hvs_formats[i].drm;
 			num_formats++;
 		}