For folks who were disappointed that the new Google Nexus 6P didn't end up with Quick Charge 2.0 technology, this new confirmation from within Huawei will probably not make you any happier. It might at least provide an explanation. According to Huawei’s Richard Yuan, the new phone actually does support the Quick Charge 2.0 from within the hardware. That should actually not come as a surprise. The Qualcomm Snapdragon 810 in the phone has support for it built into the SoC, and it wouldn't have made sense for Huawei to spend extra money having Qualcomm design a separate version of the chip without the tech.
It turns out that Huawei decided to simply disable the feature. Here's a quote from Yuan,
As angler will not support QC2.0, but pmi8994 and smb1351 support QC2.0, we should disable this feature. Modify pmi8994 register 0x13f1 and 0x13f4 to set 5V only and disable HVDCP for pmi8994. Modify smb1351 registers 0x10, 0x12, 0x14 to set 5V only and disable HVDCP for smb1351.
The reasoning behind this shouldn't be too hard to wrap your head around. Huawei and Google wanted the phone to fully support the transition to USB Type-C. It has its own version of quick charge technology that works just as well as Qualcomm's version. Sometimes the ever-forward momentum of progressing technology tends to step on older ideas, and causes frustration in the process.
Source: Phandroid
Here's our dedicated Nexus 6P section for further discussion: Nexus 6P by Huawei | Android Forum at DroidForums.net