Re: [Intel-gfx] [PATCH v1] drm/i915: Try EDID bitbanging on HDMI after failed read

2018-01-09 Thread Daniel Vetter
On Sun, Dec 24, 2017 at 10:45:24PM +0100, Stefan Brüns wrote: > The ACK/NACK implementation as found in e.g. the G965 has the falling > clock edge and the release of the data line to ACK the received byte > happen at the same time. > > Some HDMI-to-VGA converters apparently read the ACK not in

[Intel-gfx] [PATCH v1] drm/i915: Try EDID bitbanging on HDMI after failed read

2017-12-24 Thread Stefan Brüns
The ACK/NACK implementation as found in e.g. the G965 has the falling clock edge and the release of the data line to ACK the received byte happen at the same time. Some HDMI-to-VGA converters apparently read the ACK not in the middle of the clock high phase, but at the rising clock edge, so