linux-kernel - [PATCH v2 2/3] drm: introduce bus_flags in drm_display

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Message-Id: <1454968663-30066-3-git-send-email-stefan@agner.ch>
Date:	Mon,  8 Feb 2016 13:57:42 -0800
From:	Stefan Agner <stefan@...er.ch>
To:	dri-devel@...ts.freedesktop.org, thierry.reding@...il.com
Cc:	stefan@...er.ch, airlied@...ux.ie, daniel.vetter@...ll.ch,
	jianwei.wang.chn@...il.com, alison.wang@...escale.com,
	meng.yi@....com, linux@....linux.org.uk, p.zabel@...gutronix.de,
	denis@...rea.com, eric@...rea.com, ville.syrjala@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] drm: introduce bus_flags in drm_display_info

Introduce bus_flags to specify display bus properties like signal
polarities. This is useful for parallel display buses, e.g. to
specify the pixel clock or data enable polarity.

Suggested-by: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 include/drm/drm_crtc.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c65a212..20a489d 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -126,6 +126,14 @@ enum subpixel_order {
 #define DRM_COLOR_FORMAT_RGB444		(1<<0)
 #define DRM_COLOR_FORMAT_YCRCB444	(1<<1)
 #define DRM_COLOR_FORMAT_YCRCB422	(1<<2)
+
+#define DRM_BUS_FLAG_DE_LOW		(1<<0)
+#define DRM_BUS_FLAG_DE_HIGH		(1<<1)
+/* drive data on pos. edge */
+#define DRM_BUS_FLAG_PIXDATA_POSEDGE	(1<<2)
+/* drive data on neg. edge */
+#define DRM_BUS_FLAG_PIXDATA_NEGEDGE	(1<<3)
+
 /*
  * Describes a given display (e.g. CRT or flat panel) and its limitations.
  */
@@ -147,6 +155,7 @@ struct drm_display_info {
 
 	const u32 *bus_formats;
 	unsigned int num_bus_formats;
+	u32 bus_flags;
 
 	/* Mask of supported hdmi deep color modes */
 	u8 edid_hdmi_dc_modes;
-- 
2.7.1