Re: [PATCH v2] drm/i915: Add a DP1.2 compatible way to read LTTPR capabilities

2022-03-22 Thread Ville Syrjälä
On Tue, Mar 22, 2022 at 04:38:44PM +0200, Imre Deak wrote: > At least some DELL monitors (P2715Q) with DPCD_REV 1.2 return corrupted > DPCD register values when reading from the 0xF- LTTPR range with an > AUX transaction block size bigger than 1. The DP standard requires 0 to > be returned - as

[PATCH v2] drm/i915: Add a DP1.2 compatible way to read LTTPR capabilities

2022-03-22 Thread Imre Deak
At least some DELL monitors (P2715Q) with DPCD_REV 1.2 return corrupted DPCD register values when reading from the 0xF- LTTPR range with an AUX transaction block size bigger than 1. The DP standard requires 0 to be returned - as for any other reserved/invalid addresses - but these monitors retu