drm/tegra: dc: Add Tegra186 support

The display architecture has changed in several signifcant ways with the
new Tegra186 SoC. Display controllers are a completely different design,
but have been given a frontend that simulates the register interface for
earlier chips.

Unfortunately the frontend isn't completely backwards compatible, so the
driver needs parameterization to take the changes into account.

One big change is that the total number of display controllers has been
increased to three. At the same time the number of planes available has
remained constant. However, planes can now be freely assigned between
the display controllers, giving applications more flexibility in making
the best use of the available resources.

Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 200 insertions, 50 deletions

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 25e998f..5878d42 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -19,6 +19,7 @@
 #include "dc.h"
 #include "drm.h"
 #include "gem.h"
+#include "hub.h"
 #include "plane.h"
 
 #include <drm/drm_atomic.h>
@@ -419,8 +420,8 @@ static const struct drm_plane_helper_funcs tegra_plane_helper_funcs = {
 	.atomic_update = tegra_plane_atomic_update,
 };
 
-static struct drm_plane *tegra_dc_primary_plane_create(struct drm_device *drm,
-						       struct tegra_dc *dc)
+static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm,
+						    struct tegra_dc *dc)
 {
 	/*
 	 * Ideally this would use drm_crtc_mask(), but that would require the
@@ -435,6 +436,7 @@ static struct drm_plane *tegra_dc_primary_plane_create(struct drm_device *drm,
 	 * the same as drm_crtc_index() after registration.
 	 */
 	unsigned long possible_crtcs = 1 << drm->mode_config.num_crtc;
+	enum drm_plane_type type = DRM_PLANE_TYPE_PRIMARY;
 	struct tegra_plane *plane;
 	unsigned int num_formats;
 	const u32 *formats;
@@ -458,8 +460,7 @@ static struct drm_plane *tegra_dc_primary_plane_create(struct drm_device *drm,
 
 	err = drm_universal_plane_init(drm, &plane->base, possible_crtcs,
 				       &tegra_plane_funcs, formats,
-				       num_formats, NULL,
-				       DRM_PLANE_TYPE_PRIMARY, NULL);
+				       num_formats, NULL, type, NULL);
 	if (err < 0) {
 		kfree(plane);
 		return ERR_PTR(err);
@@ -672,18 +673,61 @@ static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm,
 	return &plane->base;
 }
 
-static int tegra_dc_add_planes(struct drm_device *drm, struct tegra_dc *dc)
+static struct drm_plane *tegra_dc_add_shared_planes(struct drm_device *drm,
+						    struct tegra_dc *dc)
+{
+	struct drm_plane *plane, *primary = NULL;
+	unsigned int i, j;
+
+	for (i = 0; i < dc->soc->num_wgrps; i++) {
+		const struct tegra_windowgroup_soc *wgrp = &dc->soc->wgrps[i];
+
+		if (wgrp->dc == dc->pipe) {
+			for (j = 0; j < wgrp->num_windows; j++) {
+				unsigned int index = wgrp->windows[j];
+
+				plane = tegra_shared_plane_create(drm, dc,
+								  wgrp->index,
+								  index);
+				if (IS_ERR(plane))
+					return plane;
+
+				/*
+				 * Choose the first shared plane owned by this
+				 * head as the primary plane.
+				 */
+				if (!primary) {
+					plane->type = DRM_PLANE_TYPE_PRIMARY;
+					primary = plane;
+				}
+			}
+		}
+	}
+
+	return primary;
+}
+
+static struct drm_plane *tegra_dc_add_planes(struct drm_device *drm,
+					     struct tegra_dc *dc)
 {
-	struct drm_plane *plane;
+	struct drm_plane *plane, *primary;
 	unsigned int i;
 
+	primary = tegra_primary_plane_create(drm, dc);
+	if (IS_ERR(primary))
+		return primary;
+
 	for (i = 0; i < 2; i++) {
 		plane = tegra_dc_overlay_plane_create(drm, dc, 1 + i);
-		if (IS_ERR(plane))
-			return PTR_ERR(plane);
+		if (IS_ERR(plane)) {
+			/* XXX tegra_plane_destroy() */
+			drm_plane_cleanup(primary);
+			kfree(primary);
+			return plane;
+		}
 	}
 
-	return 0;
+	return primary;
 }
 
 static void tegra_dc_destroy(struct drm_crtc *crtc)
@@ -1073,7 +1117,8 @@ static u32 tegra_dc_get_vblank_counter(struct drm_crtc *crtc)
 {
 	struct tegra_dc *dc = to_tegra_dc(crtc);
 
-	if (dc->syncpt)
+	/* XXX vblank syncpoints don't work with nvdisplay yet */
+	if (dc->syncpt && !dc->soc->has_nvdisplay)
 		return host1x_syncpt_read(dc->syncpt);
 
 	/* fallback to software emulated VBLANK counter */
@@ -1131,10 +1176,12 @@ static int tegra_dc_set_timings(struct tegra_dc *dc,
 	unsigned int v_ref_to_sync = 1;
 	unsigned long value;
 
-	tegra_dc_writel(dc, 0x0, DC_DISP_DISP_TIMING_OPTIONS);
+	if (!dc->soc->has_nvdisplay) {
+		tegra_dc_writel(dc, 0x0, DC_DISP_DISP_TIMING_OPTIONS);
 
-	value = (v_ref_to_sync << 16) | h_ref_to_sync;
-	tegra_dc_writel(dc, value, DC_DISP_REF_TO_SYNC);
+		value = (v_ref_to_sync << 16) | h_ref_to_sync;
+		tegra_dc_writel(dc, value, DC_DISP_REF_TO_SYNC);
+	}
 
 	value = ((mode->vsync_end - mode->vsync_start) << 16) |
 		((mode->hsync_end - mode->hsync_start) <<  0);
@@ -1213,8 +1260,10 @@ static void tegra_dc_commit_state(struct tegra_dc *dc,
 		      state->div);
 	DRM_DEBUG_KMS("pclk: %lu\n", state->pclk);
 
-	value = SHIFT_CLK_DIVIDER(state->div) | PIXEL_CLK_DIVIDER_PCD1;
-	tegra_dc_writel(dc, value, DC_DISP_DISP_CLOCK_CONTROL);
+	if (!dc->soc->has_nvdisplay) {
+		value = SHIFT_CLK_DIVIDER(state->div) | PIXEL_CLK_DIVIDER_PCD1;
+		tegra_dc_writel(dc, value, DC_DISP_DISP_CLOCK_CONTROL);
+	}
 
 	err = clk_set_rate(dc->clk, state->pclk);
 	if (err < 0)
@@ -1324,39 +1373,66 @@ static void tegra_crtc_atomic_enable(struct drm_crtc *crtc,
 
 	/* initialize display controller */
 	if (dc->syncpt) {
-		u32 syncpt = host1x_syncpt_id(dc->syncpt);
+		u32 syncpt = host1x_syncpt_id(dc->syncpt), enable;
+
+		if (dc->soc->has_nvdisplay)
+			enable = 1 << 31;
+		else
+			enable = 1 << 8;
 
 		value = SYNCPT_CNTRL_NO_STALL;
 		tegra_dc_writel(dc, value, DC_CMD_GENERAL_INCR_SYNCPT_CNTRL);
 
-		value = SYNCPT_VSYNC_ENABLE | syncpt;
+		value = enable | syncpt;
 		tegra_dc_writel(dc, value, DC_CMD_CONT_SYNCPT_VSYNC);
 	}
 
-	value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
-		WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
-	tegra_dc_writel(dc, value, DC_CMD_INT_TYPE);
-
-	value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
-		WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
-	tegra_dc_writel(dc, value, DC_CMD_INT_POLARITY);
+	if (dc->soc->has_nvdisplay) {
+		value = DSC_TO_UF_INT | DSC_BBUF_UF_INT | DSC_RBUF_UF_INT |
+			DSC_OBUF_UF_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_TYPE);
 
-	/* initialize timer */
-	value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(0x20) |
-		WINDOW_B_THRESHOLD(0x20) | WINDOW_C_THRESHOLD(0x20);
-	tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY);
+		value = DSC_TO_UF_INT | DSC_BBUF_UF_INT | DSC_RBUF_UF_INT |
+			DSC_OBUF_UF_INT | SD3_BUCKET_WALK_DONE_INT |
+			HEAD_UF_INT | MSF_INT | REG_TMOUT_INT |
+			REGION_CRC_INT | V_PULSE2_INT | V_PULSE3_INT |
+			VBLANK_INT | FRAME_END_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_POLARITY);
 
-	value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(1) |
-		WINDOW_B_THRESHOLD(1) | WINDOW_C_THRESHOLD(1);
-	tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY_TIMER);
+		value = SD3_BUCKET_WALK_DONE_INT | HEAD_UF_INT | VBLANK_INT |
+			FRAME_END_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_ENABLE);
 
-	value = VBLANK_INT | WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
-		WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
-	tegra_dc_writel(dc, value, DC_CMD_INT_ENABLE);
+		value = HEAD_UF_INT | REG_TMOUT_INT | FRAME_END_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
 
-	value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
-		WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
-	tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
+		tegra_dc_writel(dc, READ_MUX, DC_CMD_STATE_ACCESS);
+	} else {
+		value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
+			WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_TYPE);
+
+		value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
+			WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_POLARITY);
+
+		/* initialize timer */
+		value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(0x20) |
+			WINDOW_B_THRESHOLD(0x20) | WINDOW_C_THRESHOLD(0x20);
+		tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY);
+
+		value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(1) |
+			WINDOW_B_THRESHOLD(1) | WINDOW_C_THRESHOLD(1);
+		tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY_TIMER);
+
+		value = VBLANK_INT | WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
+			WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_ENABLE);
+
+		value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
+			WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
+		tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
+	}
 
 	if (dc->soc->supports_background_color)
 		tegra_dc_writel(dc, 0, DC_DISP_BLEND_BACKGROUND_COLOR);
@@ -1381,10 +1457,18 @@ static void tegra_crtc_atomic_enable(struct drm_crtc *crtc,
 	value |= DISP_CTRL_MODE_C_DISPLAY;
 	tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);
 
-	value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
-	value |= PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
-		 PW4_ENABLE | PM0_ENABLE | PM1_ENABLE;
-	tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);
+	if (!dc->soc->has_nvdisplay) {
+		value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
+		value |= PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
+			 PW4_ENABLE | PM0_ENABLE | PM1_ENABLE;
+		tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);
+	}
+
+	/* enable underflow reporting and display red for missing pixels */
+	if (dc->soc->has_nvdisplay) {
+		value = UNDERFLOW_MODE_RED | UNDERFLOW_REPORT_ENABLE;
+		tegra_dc_writel(dc, value, DC_COM_RG_UNDERFLOW);
+	}
 
 	tegra_dc_commit(dc);
 
@@ -1440,9 +1524,15 @@ static void tegra_crtc_atomic_flush(struct drm_crtc *crtc,
 {
 	struct tegra_dc_state *state = to_dc_state(crtc->state);
 	struct tegra_dc *dc = to_tegra_dc(crtc);
+	u32 value;
+
+	value = state->planes << 8 | GENERAL_UPDATE;
+	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
+	value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL);
 
-	tegra_dc_writel(dc, state->planes << 8, DC_CMD_STATE_CONTROL);
-	tegra_dc_writel(dc, state->planes, DC_CMD_STATE_CONTROL);
+	value = state->planes | GENERAL_ACT_REQ;
+	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
+	value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL);
 }
 
 static const struct drm_crtc_helper_funcs tegra_crtc_helper_funcs = {
@@ -1490,6 +1580,11 @@ static irqreturn_t tegra_dc_irq(int irq, void *data)
 		dc->stats.overflow++;
 	}
 
+	if (status & HEAD_UF_INT) {
+		dev_dbg_ratelimited(dc->dev, "%s(): head underflow\n", __func__);
+		dc->stats.underflow++;
+	}
+
 	return IRQ_HANDLED;
 }
 
@@ -1518,7 +1613,11 @@ static int tegra_dc_init(struct host1x_client *client)
 		dc->domain = tegra->domain;
 	}
 
-	primary = tegra_dc_primary_plane_create(drm, dc);
+	if (dc->soc->wgrps)
+		primary = tegra_dc_add_shared_planes(drm, dc);
+	else
+		primary = tegra_dc_add_planes(drm, dc);
+
 	if (IS_ERR(primary)) {
 		err = PTR_ERR(primary);
 		goto cleanup;
@@ -1552,10 +1651,6 @@ static int tegra_dc_init(struct host1x_client *client)
 		goto cleanup;
 	}
 
-	err = tegra_dc_add_planes(drm, dc);
-	if (err < 0)
-		goto cleanup;
-
 	err = devm_request_irq(dc->dev, dc->irq, tegra_dc_irq, 0,
 			       dev_name(dc->dev), dc);
 	if (err < 0) {
@@ -1567,10 +1662,10 @@ static int tegra_dc_init(struct host1x_client *client)
 	return 0;
 
 cleanup:
-	if (cursor)
+	if (!IS_ERR_OR_NULL(cursor))
 		drm_plane_cleanup(cursor);
 
-	if (primary)
+	if (!IS_ERR(primary))
 		drm_plane_cleanup(primary);
 
 	if (tegra->domain) {
@@ -1617,6 +1712,7 @@ static const struct tegra_dc_soc_info tegra20_dc_soc_info = {
 	.pitch_align = 8,
 	.has_powergate = false,
 	.broken_reset = true,
+	.has_nvdisplay = false,
 };
 
 static const struct tegra_dc_soc_info tegra30_dc_soc_info = {
@@ -1627,6 +1723,7 @@ static const struct tegra_dc_soc_info tegra30_dc_soc_info = {
 	.pitch_align = 8,
 	.has_powergate = false,
 	.broken_reset = false,
+	.has_nvdisplay = false,
 };
 
 static const struct tegra_dc_soc_info tegra114_dc_soc_info = {
@@ -1637,6 +1734,7 @@ static const struct tegra_dc_soc_info tegra114_dc_soc_info = {
 	.pitch_align = 64,
 	.has_powergate = true,
 	.broken_reset = false,
+	.has_nvdisplay = false,
 };
 
 static const struct tegra_dc_soc_info tegra124_dc_soc_info = {
@@ -1647,6 +1745,7 @@ static const struct tegra_dc_soc_info tegra124_dc_soc_info = {
 	.pitch_align = 64,
 	.has_powergate = true,
 	.broken_reset = false,
+	.has_nvdisplay = false,
 };
 
 static const struct tegra_dc_soc_info tegra210_dc_soc_info = {
@@ -1657,10 +1756,61 @@ static const struct tegra_dc_soc_info tegra210_dc_soc_info = {
 	.pitch_align = 64,
 	.has_powergate = true,
 	.broken_reset = false,
+	.has_nvdisplay = false,
+};
+
+static const struct tegra_windowgroup_soc tegra186_dc_wgrps[] = {
+	{
+		.index = 0,
+		.dc = 0,
+		.windows = (const unsigned int[]) { 0 },
+		.num_windows = 1,
+	}, {
+		.index = 1,
+		.dc = 1,
+		.windows = (const unsigned int[]) { 1 },
+		.num_windows = 1,
+	}, {
+		.index = 2,
+		.dc = 1,
+		.windows = (const unsigned int[]) { 2 },
+		.num_windows = 1,
+	}, {
+		.index = 3,
+		.dc = 2,
+		.windows = (const unsigned int[]) { 3 },
+		.num_windows = 1,
+	}, {
+		.index = 4,
+		.dc = 2,
+		.windows = (const unsigned int[]) { 4 },
+		.num_windows = 1,
+	}, {
+		.index = 5,
+		.dc = 2,
+		.windows = (const unsigned int[]) { 5 },
+		.num_windows = 1,
+	},
+};
+
+static const struct tegra_dc_soc_info tegra186_dc_soc_info = {
+	.supports_background_color = true,
+	.supports_interlacing = true,
+	.supports_cursor = true,
+	.supports_block_linear = true,
+	.pitch_align = 64,
+	.has_powergate = false,
+	.broken_reset = false,
+	.has_nvdisplay = true,
+	.wgrps = tegra186_dc_wgrps,
+	.num_wgrps = ARRAY_SIZE(tegra186_dc_wgrps),
 };
 
 static const struct of_device_id tegra_dc_of_match[] = {
 	{
+		.compatible = "nvidia,tegra186-dc",
+		.data = &tegra186_dc_soc_info,
+	}, {
 		.compatible = "nvidia,tegra210-dc",
 		.data = &tegra210_dc_soc_info,
 	}, {