Revert "drm: make DRI1 drivers depend on BROKEN"

[deliverable/linux.git] / drivers / gpu / drm / drm_modes.c

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index e5e6f504d8ccafbd9ffe3bacad547279f09ae00c..53f07ac7c1749d20e7aa904eaabc33adbc4abbc8 100644 (file)
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -544,6 +544,7 @@ EXPORT_SYMBOL(drm_gtf_mode_complex);
  *
  * This function is to create the modeline based on the GTF algorithm.
  * Generalized Timing Formula is derived from:
+ *
  *     GTF Spreadsheet by Andy Morrish (1/5/97)
  *     available at http://www.vesa.org
  *
@@ -552,7 +553,8 @@ EXPORT_SYMBOL(drm_gtf_mode_complex);
  * I also refer to the function of fb_get_mode in the file of
  * drivers/video/fbmon.c
  *
- * Standard GTF parameters:
+ * Standard GTF parameters::
+ *
  *     M = 600
  *     C = 40
  *     K = 128
@@ -655,11 +657,36 @@ void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
 }
 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
 
+/**
+ * drm_bus_flags_from_videomode - extract information about pixelclk and
+ * DE polarity from videomode and store it in a separate variable
+ * @vm: videomode structure to use
+ * @bus_flags: information about pixelclk and DE polarity will be stored here
+ *
+ * Sets DRM_BUS_FLAG_DE_(LOW|HIGH) and DRM_BUS_FLAG_PIXDATA_(POS|NEG)EDGE
+ * in @bus_flags according to DISPLAY_FLAGS found in @vm
+ */
+void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
+{
+       *bus_flags = 0;
+       if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+               *bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
+       if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+               *bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
+
+       if (vm->flags & DISPLAY_FLAGS_DE_LOW)
+               *bus_flags |= DRM_BUS_FLAG_DE_LOW;
+       if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
+               *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+}
+EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
+
 #ifdef CONFIG_OF
 /**
  * of_get_drm_display_mode - get a drm_display_mode from devicetree
  * @np: device_node with the timing specification
  * @dmode: will be set to the return value
+ * @bus_flags: information about pixelclk and DE polarity
  * @index: index into the list of display timings in devicetree
  *
  * This function is expensive and should only be used, if only one mode is to be
@@ -670,7 +697,8 @@ EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
  * 0 on success, a negative errno code when no of videomode node was found.
  */
 int of_get_drm_display_mode(struct device_node *np,
-                           struct drm_display_mode *dmode, int index)
+                           struct drm_display_mode *dmode, u32 *bus_flags,
+                           int index)
 {
        struct videomode vm;
        int ret;
@@ -680,6 +708,8 @@ int of_get_drm_display_mode(struct device_node *np,
                return ret;
 
        drm_display_mode_from_videomode(&vm, dmode);
+       if (bus_flags)
+               drm_bus_flags_from_videomode(&vm, bus_flags);
 
        pr_debug("%s: got %dx%d display mode from %s\n",
                of_node_full_name(np), vm.hactive, vm.vactive, np->name);