drm/tilcdc: Remove tilcdc_crtc_max_width(), use private data

We already have a private data member for maximum display width so
let's use it and get rid of the redundant tilcdc_crtc_max_width().

The LCDC version probing is moved to before reading the device tree
properties so that the version information is available when private
data maximum width is initialized, if "max-width" property is not
found.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/73683d2ce151cffb811a756595b02892eeac3d84.1602349100.git.jsarha@ti.com

drivers/gpu/drm/tilcdc/tilcdc_crtc.c

@@ -754,20 +754,6 @@ static const struct drm_crtc_funcs tilcdc_crtc_funcs = {
 	.disable_vblank	= tilcdc_crtc_disable_vblank,
 };
 
-int tilcdc_crtc_max_width(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct tilcdc_drm_private *priv = dev->dev_private;
-	int max_width = 0;
-
-	if (priv->rev == 1)
-		max_width = 1024;
-	else if (priv->rev == 2)
-		max_width = 2048;
-
-	return max_width;
-}
-
 static enum drm_mode_status
 tilcdc_crtc_mode_valid(struct drm_crtc *crtc,
 		       const struct drm_display_mode *mode)
@@ -780,7 +766,7 @@ tilcdc_crtc_mode_valid(struct drm_crtc *crtc,
 	 * check to see if the width is within the range that
 	 * the LCD Controller physically supports
 	 */
-	if (mode->hdisplay > tilcdc_crtc_max_width(crtc))
+	if (mode->hdisplay > priv->max_width)
 		return MODE_VIRTUAL_X;
 
 	/* width must be multiple of 16 */

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -105,7 +105,7 @@ static void modeset_init(struct drm_device *dev)
 
 	dev->mode_config.min_width = 0;
 	dev->mode_config.min_height = 0;
-	dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
+	dev->mode_config.max_width = priv->max_width;
 	dev->mode_config.max_height = 2048;
 	dev->mode_config.funcs = &mode_config_funcs;
 }
@@ -218,22 +218,6 @@ static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
 		goto init_failed;
 	}
 
-	if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
-		priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
-
-	DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
-
-	if (of_property_read_u32(node, "max-width", &priv->max_width))
-		priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
-
-	DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
-
-	if (of_property_read_u32(node, "max-pixelclock",
-					&priv->max_pixelclock))
-		priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
-
-	DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
-
 	pm_runtime_enable(dev);
 
 	/* Determine LCD IP Version */
@@ -287,6 +271,26 @@ static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
 		}
 	}
 
+	if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
+		priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
+
+	DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
+
+	if (of_property_read_u32(node, "max-width", &priv->max_width)) {
+		if (priv->rev == 1)
+			priv->max_width = TILCDC_DEFAULT_MAX_WIDTH_V1;
+		else
+			priv->max_width = TILCDC_DEFAULT_MAX_WIDTH_V2;
+	}
+
+	DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
+
+	if (of_property_read_u32(node, "max-pixelclock",
+				 &priv->max_pixelclock))
+		priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
+
+	DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
+
 	ret = tilcdc_crtc_create(ddev);
 	if (ret < 0) {
 		dev_err(dev, "failed to create crtc\n");

drivers/gpu/drm/tilcdc/tilcdc_drv.h

@@ -28,8 +28,10 @@ struct drm_plane;
 
 /* Defaulting to pixel clock defined on AM335x */
 #define TILCDC_DEFAULT_MAX_PIXELCLOCK  126000
-/* Defaulting to max width as defined on AM335x */
-#define TILCDC_DEFAULT_MAX_WIDTH  2048
+/* Maximum display width for LCDC V1 */
+#define TILCDC_DEFAULT_MAX_WIDTH_V1  1024
+/* ... and for LCDC V2 found on AM335x: */
+#define TILCDC_DEFAULT_MAX_WIDTH_V2  2048
 /*
  * This may need some tweaking, but want to allow at least 1280x1024@60
  * with optimized DDR & EMIF settings tweaked 1920x1080@24 appears to
@@ -158,7 +160,6 @@ void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 		const struct tilcdc_panel_info *info);
 void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
 					bool simulate_vesa_sync);
-int tilcdc_crtc_max_width(struct drm_crtc *crtc);
 void tilcdc_crtc_shutdown(struct drm_crtc *crtc);
 int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
 		struct drm_framebuffer *fb,