[PATCH 07/12] drm: drm_display_mode: add signal polarity flags

[denis@eukrea.com (Denis Carikli)]

We need a way to pass signal polarity informations
  between DRM panels, and the display drivers.

To do that, a pol_flags field was added to drm_display_mode.

Signed-off-by: Denis Carikli <denis@eukrea.com>
---
ChangeLog v10->v11:
- Since the imx-drm won't be able to retrive its regulators
  from the device tree when using display-timings nodes,
  and that I was told that the drm simple-panel driver 
  already supported that, I then, instead, added what was
  lacking to make the eukrea displays work with the
  drm-simple-panel driver.

  That required a way to get back the display polarity
  informations from the imx-drm driver without affecting
  userspace.
---
 include/drm/drm_crtc.h |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index f764654..61a4fe1 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -131,6 +131,13 @@ enum drm_mode_status {
 
 #define DRM_MODE_FLAG_3D_MAX	DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF
 
+#define DRM_MODE_FLAG_POL_PIXDATA_NEGEDGE	BIT(1)
+#define DRM_MODE_FLAG_POL_PIXDATA_POSEDGE	BIT(2)
+#define DRM_MODE_FLAG_POL_PIXDATA_PRESERVE	BIT(3)
+#define DRM_MODE_FLAG_POL_DE_NEGEDGE		BIT(4)
+#define DRM_MODE_FLAG_POL_DE_POSEDGE		BIT(5)
+#define DRM_MODE_FLAG_POL_DE_PRESERVE		BIT(6)
+
 struct drm_display_mode {
 	/* Header */
 	struct list_head head;
@@ -183,6 +190,7 @@ struct drm_display_mode {
 	int vrefresh;		/* in Hz */
 	int hsync;		/* in kHz */
 	enum hdmi_picture_aspect picture_aspect_ratio;
+	unsigned int pol_flags;
 };
 
 static inline bool drm_mode_is_stereo(const struct drm_display_mode *mode)
-- 
1.7.9.5