1 files changed, 456 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
new file mode 100644
index 000000000000..5f26090b0c98
--- /dev/null
+++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-crtc.c
@@ -0,0 +1,456 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * i.MX IPUv3 Graphics driver
+ *
+ * Copyright (C) 2011 Sascha Hauer, Pengutronix
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <video/imx-ipu-v3.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "imx-drm.h"
+#include "ipuv3-plane.h"
+
+#define DRIVER_DESC		"i.MX IPUv3 Graphics"
+
+struct ipu_crtc {
+	struct device		*dev;
+	struct drm_crtc		base;
+
+	/* plane[0] is the full plane, plane[1] is the partial plane */
+	struct ipu_plane	*plane[2];
+
+	struct ipu_dc		*dc;
+	struct ipu_di		*di;
+	int			irq;
+	struct drm_pending_vblank_event *event;
+};
+
+static inline struct ipu_crtc *to_ipu_crtc(struct drm_crtc *crtc)
+{
+	return container_of(crtc, struct ipu_crtc, base);
+}
+
+static void ipu_crtc_atomic_enable(struct drm_crtc *crtc,
+				   struct drm_atomic_state *state)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
+
+	ipu_prg_enable(ipu);
+	ipu_dc_enable(ipu);
+	ipu_dc_enable_channel(ipu_crtc->dc);
+	ipu_di_enable(ipu_crtc->di);
+}
+
+static void ipu_crtc_disable_planes(struct ipu_crtc *ipu_crtc,
+				    struct drm_crtc_state *old_crtc_state)
+{
+	bool disable_partial = false;
+	bool disable_full = false;
+	struct drm_plane *plane;
+
+	drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
+		if (plane == &ipu_crtc->plane[0]->base)
+			disable_full = true;
+		if (ipu_crtc->plane[1] && plane == &ipu_crtc->plane[1]->base)
+			disable_partial = true;
+	}
+
+	if (disable_partial)
+		ipu_plane_disable(ipu_crtc->plane[1], true);
+	if (disable_full)
+		ipu_plane_disable(ipu_crtc->plane[0], true);
+}
+
+static void ipu_crtc_atomic_disable(struct drm_crtc *crtc,
+				    struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
+									      crtc);
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
+
+	ipu_dc_disable_channel(ipu_crtc->dc);
+	ipu_di_disable(ipu_crtc->di);
+	/*
+	 * Planes must be disabled before DC clock is removed, as otherwise the
+	 * attached IDMACs will be left in undefined state, possibly hanging
+	 * the IPU or even system.
+	 */
+	ipu_crtc_disable_planes(ipu_crtc, old_crtc_state);
+	ipu_dc_disable(ipu);
+	ipu_prg_disable(ipu);
+
+	drm_crtc_vblank_off(crtc);
+
+	spin_lock_irq(&crtc->dev->event_lock);
+	if (crtc->state->event && !crtc->state->active) {
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		crtc->state->event = NULL;
+	}
+	spin_unlock_irq(&crtc->dev->event_lock);
+}
+
+static void imx_drm_crtc_reset(struct drm_crtc *crtc)
+{
+	struct imx_crtc_state *state;
+
+	if (crtc->state)
+		__drm_atomic_helper_crtc_destroy_state(crtc->state);
+
+	kfree(to_imx_crtc_state(crtc->state));
+	crtc->state = NULL;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (state)
+		__drm_atomic_helper_crtc_reset(crtc, &state->base);
+}
+
+static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
+{
+	struct imx_crtc_state *state;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
+
+	WARN_ON(state->base.crtc != crtc);
+	state->base.crtc = crtc;
+
+	return &state->base;
+}
+
+static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
+				       struct drm_crtc_state *state)
+{
+	__drm_atomic_helper_crtc_destroy_state(state);
+	kfree(to_imx_crtc_state(state));
+}
+
+static int ipu_enable_vblank(struct drm_crtc *crtc)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	enable_irq(ipu_crtc->irq);
+
+	return 0;
+}
+
+static void ipu_disable_vblank(struct drm_crtc *crtc)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	disable_irq_nosync(ipu_crtc->irq);
+}
+
+static const struct drm_crtc_funcs ipu_crtc_funcs = {
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.reset = imx_drm_crtc_reset,
+	.atomic_duplicate_state = imx_drm_crtc_duplicate_state,
+	.atomic_destroy_state = imx_drm_crtc_destroy_state,
+	.enable_vblank = ipu_enable_vblank,
+	.disable_vblank = ipu_disable_vblank,
+};
+
+static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
+{
+	struct ipu_crtc *ipu_crtc = dev_id;
+	struct drm_crtc *crtc = &ipu_crtc->base;
+	unsigned long flags;
+	int i;
+
+	drm_crtc_handle_vblank(crtc);
+
+	if (ipu_crtc->event) {
+		for (i = 0; i < ARRAY_SIZE(ipu_crtc->plane); i++) {
+			struct ipu_plane *plane = ipu_crtc->plane[i];
+
+			if (!plane)
+				continue;
+
+			if (ipu_plane_atomic_update_pending(&plane->base))
+				break;
+		}
+
+		if (i == ARRAY_SIZE(ipu_crtc->plane)) {
+			spin_lock_irqsave(&crtc->dev->event_lock, flags);
+			drm_crtc_send_vblank_event(crtc, ipu_crtc->event);
+			ipu_crtc->event = NULL;
+			drm_crtc_vblank_put(crtc);
+			spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
+				  const struct drm_display_mode *mode,
+				  struct drm_display_mode *adjusted_mode)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	struct videomode vm;
+	int ret;
+
+	drm_display_mode_to_videomode(adjusted_mode, &vm);
+
+	ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
+	if (ret)
+		return false;
+
+	if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
+		return false;
+
+	drm_display_mode_from_videomode(&vm, adjusted_mode);
+
+	return true;
+}
+
+static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
+				 struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
+	u32 primary_plane_mask = drm_plane_mask(crtc->primary);
+
+	if (crtc_state->active && (primary_plane_mask & crtc_state->plane_mask) == 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
+				  struct drm_atomic_state *state)
+{
+	drm_crtc_vblank_on(crtc);
+}
+
+static void ipu_crtc_atomic_flush(struct drm_crtc *crtc,
+				  struct drm_atomic_state *state)
+{
+	spin_lock_irq(&crtc->dev->event_lock);
+	if (crtc->state->event) {
+		struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+		WARN_ON(drm_crtc_vblank_get(crtc));
+		ipu_crtc->event = crtc->state->event;
+		crtc->state->event = NULL;
+	}
+	spin_unlock_irq(&crtc->dev->event_lock);
+}
+
+static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_encoder *encoder;
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
+	struct ipu_di_signal_cfg sig_cfg = {};
+	unsigned long encoder_types = 0;
+
+	dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
+			mode->hdisplay);
+	dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
+			mode->vdisplay);
+
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+		if (encoder->crtc == crtc)
+			encoder_types |= BIT(encoder->encoder_type);
+	}
+
+	dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
+		__func__, encoder_types);
+
+	/*
+	 * If we have DAC or LDB, then we need the IPU DI clock to be
+	 * the same as the LDB DI clock. For TVDAC, derive the IPU DI
+	 * clock from 27 MHz TVE_DI clock, but allow to divide it.
+	 */
+	if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
+			     BIT(DRM_MODE_ENCODER_LVDS)))
+		sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
+	else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
+		sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
+	else
+		sig_cfg.clkflags = 0;
+
+	sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
+	/* Default to driving pixel data on negative clock edges */
+	sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
+			     DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE);
+	sig_cfg.bus_format = imx_crtc_state->bus_format;
+	sig_cfg.v_to_h_sync = 0;
+	sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
+	sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
+
+	drm_display_mode_to_videomode(mode, &sig_cfg.mode);
+	if (!IS_ALIGNED(sig_cfg.mode.hactive, 8)) {
+		unsigned int new_hactive = ALIGN(sig_cfg.mode.hactive, 8);
+
+		dev_warn(ipu_crtc->dev, "8-pixel align hactive %d -> %d\n",
+			 sig_cfg.mode.hactive, new_hactive);
+
+		sig_cfg.mode.hfront_porch = new_hactive - sig_cfg.mode.hactive;
+		sig_cfg.mode.hactive = new_hactive;
+	}
+
+	ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
+			 mode->flags & DRM_MODE_FLAG_INTERLACE,
+			 imx_crtc_state->bus_format, sig_cfg.mode.hactive);
+	ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
+}
+
+static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
+	.mode_fixup = ipu_crtc_mode_fixup,
+	.mode_set_nofb = ipu_crtc_mode_set_nofb,
+	.atomic_check = ipu_crtc_atomic_check,
+	.atomic_begin = ipu_crtc_atomic_begin,
+	.atomic_flush = ipu_crtc_atomic_flush,
+	.atomic_disable = ipu_crtc_atomic_disable,
+	.atomic_enable = ipu_crtc_atomic_enable,
+};
+
+static void ipu_put_resources(struct drm_device *dev, void *ptr)
+{
+	struct ipu_crtc *ipu_crtc = ptr;
+
+	if (!IS_ERR_OR_NULL(ipu_crtc->dc))
+		ipu_dc_put(ipu_crtc->dc);
+	if (!IS_ERR_OR_NULL(ipu_crtc->di))
+		ipu_di_put(ipu_crtc->di);
+}
+
+static int ipu_get_resources(struct drm_device *dev, struct ipu_crtc *ipu_crtc,
+			     struct ipu_client_platformdata *pdata)
+{
+	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
+	int ret;
+
+	ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
+	if (IS_ERR(ipu_crtc->dc))
+		return PTR_ERR(ipu_crtc->dc);
+
+	ret = drmm_add_action_or_reset(dev, ipu_put_resources, ipu_crtc);
+	if (ret)
+		return ret;
+
+	ipu_crtc->di = ipu_di_get(ipu, pdata->di);
+	if (IS_ERR(ipu_crtc->di))
+		return PTR_ERR(ipu_crtc->di);
+
+	return 0;
+}
+
+static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
+{
+	struct ipu_client_platformdata *pdata = dev->platform_data;
+	struct ipu_soc *ipu = dev_get_drvdata(dev->parent);
+	struct drm_device *drm = data;
+	struct ipu_plane *primary_plane;
+	struct ipu_crtc *ipu_crtc;
+	struct drm_crtc *crtc;
+	int dp = -EINVAL;
+	int ret;
+
+	if (pdata->dp >= 0)
+		dp = IPU_DP_FLOW_SYNC_BG;
+	primary_plane = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
+				       DRM_PLANE_TYPE_PRIMARY);
+	if (IS_ERR(primary_plane))
+		return PTR_ERR(primary_plane);
+
+	ipu_crtc = drmm_crtc_alloc_with_planes(drm, struct ipu_crtc, base,
+					       &primary_plane->base, NULL,
+					       &ipu_crtc_funcs, NULL);
+	if (IS_ERR(ipu_crtc))
+		return PTR_ERR(ipu_crtc);
+
+	ipu_crtc->dev = dev;
+	ipu_crtc->plane[0] = primary_plane;
+
+	crtc = &ipu_crtc->base;
+	crtc->port = pdata->of_node;
+	drm_crtc_helper_add(crtc, &ipu_helper_funcs);
+
+	ret = ipu_get_resources(drm, ipu_crtc, pdata);
+	if (ret) {
+		dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
+			ret);
+		return ret;
+	}
+
+	/* If this crtc is using the DP, add an overlay plane */
+	if (pdata->dp >= 0 && pdata->dma[1] > 0) {
+		ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
+						IPU_DP_FLOW_SYNC_FG,
+						drm_crtc_mask(&ipu_crtc->base),
+						DRM_PLANE_TYPE_OVERLAY);
+		if (IS_ERR(ipu_crtc->plane[1]))
+			ipu_crtc->plane[1] = NULL;
+	}
+
+	ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
+	ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
+			"imx_drm", ipu_crtc);
+	if (ret < 0) {
+		dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
+		return ret;
+	}
+	/* Only enable IRQ when we actually need it to trigger work. */
+	disable_irq(ipu_crtc->irq);
+
+	return 0;
+}
+
+static const struct component_ops ipu_crtc_ops = {
+	.bind = ipu_drm_bind,
+};
+
+static int ipu_drm_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	if (!dev->platform_data)
+		return -EINVAL;
+
+	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	return component_add(dev, &ipu_crtc_ops);
+}
+
+static int ipu_drm_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &ipu_crtc_ops);
+	return 0;
+}
+
+struct platform_driver ipu_drm_driver = {
+	.driver = {
+		.name = "imx-ipuv3-crtc",
+	},
+	.probe = ipu_drm_probe,
+	.remove = ipu_drm_remove,
+};