18 Mar
2014
18 Mar
'14
9:30 a.m.
On Tue, Mar 18, 2014 at 08:50:30AM +0100, Lothar Waßmann wrote:
Hi,
Laurent Pinchart wrote:
Hi Lothar,
On Monday 17 March 2014 16:14:36 Lothar Waßmann wrote:
DE is not a clock signal, but an 'Enable' signal whose value (high or low) defines the window in which the pixel data is valid. The flag defines whether data is valid during the HIGH or LOW period of DE.
The DRM_MODE_FLAG_POL_DE_(LOW|HIGH) do, by my impression of the proposed new DRM_MODE_FLAG_POL_DE_*EDGE flags is that they define sampling clock edges, not active levels.
The current naming of the flags gives the impression that they describe the sampling edges of a clock signal. But the DE signal in fact is not a clock signal but a level sensitive gating signal.
+1
--
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