drm/tegra: Add Tegra124 DC support

Tegra124 and later support interlacing, but the driver doesn't support
it yet. Make sure interlacing stays disabled on hardware that supports
it.

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

4 files changed, 53 insertions, 6 deletions

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index cd7f1e499616..f89445d3cab7 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -15,6 +15,10 @@
 #include "drm.h"
 #include "gem.h"
 
+struct tegra_dc_soc_info {
+        bool supports_interlacing;
+};
+
 struct tegra_plane {
         struct drm_plane base;
         unsigned int index;
@@ -658,6 +662,13 @@ static int tegra_crtc_mode_set(struct drm_crtc *crtc,
         /* program display mode */
         tegra_dc_set_timings(dc, mode);
 
+        /* interlacing isn't supported yet, so disable it */
+        if (dc->soc->supports_interlacing) {
+                value = tegra_dc_readl(dc, DC_DISP_INTERLACE_CONTROL);
+                value &= ~INTERLACE_ENABLE;
+                tegra_dc_writel(dc, value, DC_DISP_INTERLACE_CONTROL);
+        }
+
         value = DE_SELECT_ACTIVE | DE_CONTROL_NORMAL;
         tegra_dc_writel(dc, value, DC_DISP_DATA_ENABLE_OPTIONS);
 
@@ -1167,8 +1178,36 @@ static const struct host1x_client_ops dc_client_ops = {
         .exit = tegra_dc_exit,
 };
 
+static const struct tegra_dc_soc_info tegra20_dc_soc_info = {
+        .supports_interlacing = false,
+};
+
+static const struct tegra_dc_soc_info tegra30_dc_soc_info = {
+        .supports_interlacing = false,
+};
+
+static const struct tegra_dc_soc_info tegra124_dc_soc_info = {
+        .supports_interlacing = true,
+};
+
+static const struct of_device_id tegra_dc_of_match[] = {
+        {
+                .compatible = "nvidia,tegra124-dc",
+                .data = &tegra124_dc_soc_info,
+        }, {
+                .compatible = "nvidia,tegra30-dc",
+                .data = &tegra30_dc_soc_info,
+        }, {
+                .compatible = "nvidia,tegra20-dc",
+                .data = &tegra20_dc_soc_info,
+        }, {
+                /* sentinel */
+        }
+};
+
 static int tegra_dc_probe(struct platform_device *pdev)
 {
+        const struct of_device_id *id;
         struct resource *regs;
         struct tegra_dc *dc;
         int err;
@@ -1177,9 +1216,14 @@ static int tegra_dc_probe(struct platform_device *pdev)
         if (!dc)
                 return -ENOMEM;
 
+        id = of_match_node(tegra_dc_of_match, pdev->dev.of_node);
+        if (!id)
+                return -ENODEV;
+
         spin_lock_init(&dc->lock);
         INIT_LIST_HEAD(&dc->list);
         dc->dev = &pdev->dev;
+        dc->soc = id->data;
 
         dc->clk = devm_clk_get(&pdev->dev, NULL);
         if (IS_ERR(dc->clk)) {
@@ -1253,12 +1297,6 @@ static int tegra_dc_remove(struct platform_device *pdev)
         return 0;
 }
 
-static struct of_device_id tegra_dc_of_match[] = {
-        { .compatible = "nvidia,tegra30-dc", },
-        { .compatible = "nvidia,tegra20-dc", },
-        { },
-};
-
 struct platform_driver tegra_dc_driver = {
         .driver = {
                 .name = "tegra-dc",
diff --git a/drivers/gpu/drm/tegra/dc.h b/drivers/gpu/drm/tegra/dc.h
index 788627a060d7..e6a9df0abe68 100644
--- a/drivers/gpu/drm/tegra/dc.h
+++ b/drivers/gpu/drm/tegra/dc.h
@@ -294,6 +294,11 @@
 #define DC_DISP_SD_HW_K_VALUES                  0x4dd
 #define DC_DISP_SD_MAN_K_VALUES                 0x4de
 
+#define DC_DISP_INTERLACE_CONTROL               0x4e5
+#define  INTERLACE_STATUS (1 << 2)
+#define  INTERLACE_START  (1 << 1)
+#define  INTERLACE_ENABLE (1 << 0)
+
 #define DC_WIN_CSC_YOF                          0x611
 #define DC_WIN_CSC_KYRGB                        0x612
 #define DC_WIN_CSC_KUR                          0x613
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index a0b34816298c..eec8d2e2db5c 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -658,6 +658,7 @@ static const struct of_device_id host1x_drm_subdevs[] = {
         { .compatible = "nvidia,tegra114-dsi", },
         { .compatible = "nvidia,tegra114-hdmi", },
         { .compatible = "nvidia,tegra114-gr3d", },
+        { .compatible = "nvidia,tegra124-dc", },
         { /* sentinel */ }
 };
 
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index 6b293c88a8ca..bf1cac7658f8 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -88,6 +88,7 @@ extern int tegra_drm_unregister_client(struct tegra_drm *tegra,
 extern int tegra_drm_init(struct tegra_drm *tegra, struct drm_device *drm);
 extern int tegra_drm_exit(struct tegra_drm *tegra);
 
+struct tegra_dc_soc_info;
 struct tegra_output;
 
 struct tegra_dc {
@@ -113,6 +114,8 @@ struct tegra_dc {
 
         /* page-flip handling */
         struct drm_pending_vblank_event *event;
+
+        const struct tegra_dc_soc_info *soc;
 };
 
 static inline struct tegra_dc *