The DRM_BUS_FLAG_PIXDATA_POSEDGE and DRM_BUS_FLAG_PIXDATA_NEGEDGE macros
define on which pixel clock edge data signals are driven. They are
however used in some drivers to define on which pixel clock edge data
signals are sampled, which should usually (but not always) be the
opposite edge of the driving edge. This creates confusion.
Create four new macros explicitly stating the driving and sampling edge
in their name to remove the confusing. The driving macros are defined as
the opposite of the sampling macros to made code simpler based on the
assumption that the driving and sampling edges are opposite.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
include/drm/drm_connector.h | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 91a877fa00cb..b0accf804d1c 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -283,10 +283,26 @@ struct drm_display_info {
#define DRM_BUS_FLAG_DE_LOW (1<<0)
#define DRM_BUS_FLAG_DE_HIGH (1<<1)
-/* drive data on pos. edge */
+
+/*
+ * Don't use those two flags directly, use the DRM_BUS_FLAG_PIXDATA_DRIVE_*
+ * and DRM_BUS_FLAG_PIXDATA_SAMPLE_* variants to qualify the flags explicitly.
+ * The DRM_BUS_FLAG_PIXDATA_SAMPLE_* flags are defined as the opposite of the
+ * DRM_BUS_FLAG_PIXDATA_DRIVE_* flags to make code simpler, as signals are
+ * usually to be sampled on the opposite edge of the driving edge.
+ */
#define DRM_BUS_FLAG_PIXDATA_POSEDGE (1<<2)
-/* drive data on neg. edge */
#define DRM_BUS_FLAG_PIXDATA_NEGEDGE (1<<3)
+
+/* Drive data on rising edge */
+#define DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE DRM_BUS_FLAG_PIXDATA_POSEDGE
+/* Drive data on falling edge */
+#define DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE DRM_BUS_FLAG_PIXDATA_NEGEDGE
+/* Sample data on rising edge */
+#define DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE DRM_BUS_FLAG_PIXDATA_NEGEDGE
+/* Sample data on falling edge */
+#define DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE DRM_BUS_FLAG_PIXDATA_POSEDGE
+
/* data is transmitted MSB to LSB on the bus */
#define DRM_BUS_FLAG_DATA_MSB_TO_LSB (1<<4)
/* data is transmitted LSB to MSB on the bus */
--
Regards,
Laurent Pinchart
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
