Re: [Intel-gfx] [PATCH] drm/i915: Fix DP clock recovery "voltage_tries" handling

2021-10-01 Thread Imre Deak
On Fri, Oct 01, 2021 at 07:08:26PM +0300, Ville Syrjala wrote: > From: Ville Syrjälä > > The DP spec says: > "If the receiver keeps the same value in the ADJUST_REQUEST_LANEx_y > register(s) while the LANEx_CR_DONE bits remain unset, the transmitter > must loop four times with the same voltage

[Intel-gfx] [PATCH] drm/i915: Fix DP clock recovery "voltage_tries" handling

2021-10-01 Thread Ville Syrjala
From: Ville Syrjälä The DP spec says: "If the receiver keeps the same value in the ADJUST_REQUEST_LANEx_y register(s) while the LANEx_CR_DONE bits remain unset, the transmitter must loop four times with the same voltage swing. On the fifth time, the transmitter must down-shift to the lower