3 files changed, 34 insertions, 32 deletions

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index b06b1453db2dd..2309a9a0c925d 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -285,27 +285,15 @@ static void tilcdc_crtc_set_mode(struct drm_crtc *crtc)
 
 	/* Configure the Burst Size and fifo threshold of DMA: */
 	reg = tilcdc_read(dev, LCDC_DMA_CTRL_REG) & ~0x00000770;
-	switch (info->dma_burst_sz) {
-	case 1:
-		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_1);
-		break;
-	case 2:
-		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_2);
-		break;
-	case 4:
-		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_4);
-		break;
-	case 8:
-		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_8);
-		break;
-	case 16:
-		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_16);
-		break;
-	default:
-		dev_err(dev->dev, "invalid burst size\n");
-		return;
+	/* Use 16 bit DMA burst size by default */
+	reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_16);
+	if (priv->fifo_th) {
+		int fifo_th_val = ilog2(priv->fifo_th) - 3;
+
+		reg |= (fifo_th_val << 8);
+	} else {
+		reg |= (info->fifo_th << 8);
 	}
-	reg |= (info->fifo_th << 8);
 	tilcdc_write(dev, LCDC_DMA_CTRL_REG, reg);
 
 	/* Configure timings: */
@@ -321,8 +309,8 @@ static void tilcdc_crtc_set_mode(struct drm_crtc *crtc)
 
 	/* Set AC Bias Period and Number of Transitions per Interrupt: */
 	reg = tilcdc_read(dev, LCDC_RASTER_TIMING_2_REG) & ~0x000fff00;
-	reg |= LCDC_AC_BIAS_FREQUENCY(info->ac_bias) |
-		LCDC_AC_BIAS_TRANSITIONS_PER_INT(info->ac_bias_intrpt);
+	/* Use 255 AC Bias Pin Frequency by default */
+	reg |= LCDC_AC_BIAS_FREQUENCY(255);
 
 	/*
 	 * subtract one from hfp, hbp, hsw because the hardware uses
@@ -392,20 +380,19 @@ static void tilcdc_crtc_set_mode(struct drm_crtc *crtc)
 			return;
 		}
 	}
-	reg |= info->fdd << 12;
+	/* Use 128 FIFO DMA Request Delay by default */
+	reg |= 128 << 12;
 	tilcdc_write(dev, LCDC_RASTER_CTRL_REG, reg);
 
-	if (info->invert_pxl_clk)
+	if (info->invert_pxl_clk ||
+	    mode->flags == DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
 		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 	else
 		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 
-	if (info->sync_ctrl)
-		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
-	else
-		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
-
-	if (info->sync_edge)
+	tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
+	if (info->sync_edge ||
+	    mode->flags == DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE)
 		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
 	else
 		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 3dcbec312bacb..fe01f3fcaf3c2 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -31,6 +31,11 @@
 #include "tilcdc_panel.h"
 #include "tilcdc_regs.h"
 
+enum tilcdc_variant {
+	AM33XX_TILCDC,
+	DA850_TILCDC,
+};
+
 static LIST_HEAD(module_list);
 
 static const u32 tilcdc_rev1_formats[] = { DRM_FORMAT_RGB565 };
@@ -198,6 +203,7 @@ static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct device_node *node = dev->of_node;
 	struct tilcdc_drm_private *priv;
+	enum tilcdc_variant variant;
 	u32 bpp = 0;
 	int ret;
 
@@ -209,6 +215,8 @@ static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
 	if (IS_ERR(ddev))
 		return PTR_ERR(ddev);
 
+	variant = (uintptr_t)of_device_get_match_data(dev);
+
 	ddev->dev_private = priv;
 	platform_set_drvdata(pdev, ddev);
 	drm_mode_config_init(ddev);
@@ -309,6 +317,11 @@ static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
 
 	DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 
+	if (variant == DA850_TILCDC)
+		priv->fifo_th = 16;
+	else
+		priv->fifo_th = 8;
+
 	ret = tilcdc_crtc_create(ddev);
 	if (ret < 0) {
 		dev_err(dev, "failed to create crtc\n");
@@ -598,8 +611,8 @@ static void tilcdc_pdev_shutdown(struct platform_device *pdev)
 }
 
 static const struct of_device_id tilcdc_of_match[] = {
-		{ .compatible = "ti,am33xx-tilcdc", },
-		{ .compatible = "ti,da850-tilcdc", },
+		{ .compatible = "ti,am33xx-tilcdc", .data = (void *)AM33XX_TILCDC},
+		{ .compatible = "ti,da850-tilcdc", .data = (void *)DA850_TILCDC},
 		{ },
 };
 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.h b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
index 3aba3a1155ba0..79078b4ae7393 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
@@ -61,6 +61,8 @@ struct tilcdc_drm_private {
 	 */
 	uint32_t max_width;
 
+	u32 fifo_th;
+
 	/* Supported pixel formats */
 	const uint32_t *pixelformats;
 	uint32_t num_pixelformats;