drm/dp/mst: Calculate MST PBN with 31.32 fixed point

Browse source

commit a9ebb3e46c upstream.

Our PBN value overflows the 20 bits integer part of the 20.12
fixed point. We need to use 31.32 fixed point to avoid this.

This happens with display clocks larger than 293122 (at 24 bpp),
which we see with the Sharp (and similar) 4k tiled displays.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Harry Wentland 2016-01-22 17:07:26 -05:00 • committed by Greg Kroah-Hartman

parent b870070037

commit 6cd43e68d9

1 changed files with 39 additions and 28 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

59

drivers/gpu/drm/drm_dp_mst_topology.c

View file