tree f04c4f77182d3b82d9f309ab2a42dc2e75bb66e1
parent ae45bbc2ba8f92b5a773fece6f5792f497c89282
author Mario Kleiner <mario.kleiner.de@gmail.com> 1492990389 +0200
committer Alex Deucher <alexander.deucher@amd.com> 1493415184 -0400

drm/radeon: Make display watermark calculations more accurate

Avoid big roundoff errors in scanline/hactive durations for
high pixel clocks, especially for >= 500 Mhz, and thereby
program more accurate display fifo watermarks.

This is a port of the corresponding amdgpu patch.

Implemented for DCE 4,6,8.
Tested on Evergreen/DCE-4 with Radeon HD-5770.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>