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drm/amd/display: Fix negative cursor pos programming (v2) 

[Why]
If the cursor pos passed from DM is less than the plane_state->dst_rect
top left corner then the unsigned cursor pos wraps around to a large
positive number since cursor pos is a u32.

There was an attempt to guard against this in hubp1_cursor_set_position
by checking the src_x_offset and src_y_offset and offseting the
cursor hotspot within hubp1_cursor_set_position.

However, the cursor position itself is still being programmed
incorrectly as a large value.

This manifests itself visually as the cursor disappearing or containing
strange artifacts near the middle of the screen on raven.

[How]
Don't subtract the destination rect top left corner from the pos but
add it to the hotspot instead. This happens before the pos gets
passed into hubp1_cursor_set_position.

This achieves the same result but avoids the subtraction wrap around.
With this fix the original cursor programming logic can be used again.

v2: add hunk that got dropped accidently when this patch was originally
committed. (Alex)
Fixes: 0921c41e19 ("drm/amd/display: Fix negative cursor pos programming")

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Acked-by: Murton Liu <Murton.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2019-02-01 09:36:59 -05:00 committed by Alex Deucher
parent c1cefe115d
commit bd13b2b874
1 changed files with 2 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c
View File

@ -1150,28 +1150,9 @@ void hubp1_cursor_set_position(
REG_UPDATE(CURSOR_CONTROL,
CURSOR_ENABLE, cur_en);
//account for cases where we see negative offset relative to overlay plane
if (src_x_offset < 0 && src_y_offset < 0) {
REG_SET_2(CURSOR_POSITION, 0,
CURSOR_X_POSITION, 0,
CURSOR_Y_POSITION, 0);
x_hotspot -= src_x_offset;
y_hotspot -= src_y_offset;
} else if (src_x_offset < 0) {
REG_SET_2(CURSOR_POSITION, 0,
CURSOR_X_POSITION, 0,
CURSOR_Y_POSITION, pos->y);
x_hotspot -= src_x_offset;
} else if (src_y_offset < 0) {
REG_SET_2(CURSOR_POSITION, 0,
REG_SET_2(CURSOR_POSITION, 0,
CURSOR_X_POSITION, pos->x,
CURSOR_Y_POSITION, 0);
y_hotspot -= src_y_offset;
} else {
REG_SET_2(CURSOR_POSITION, 0,
CURSOR_X_POSITION, pos->x,
CURSOR_Y_POSITION, pos->y);
}
CURSOR_Y_POSITION, pos->y);
REG_SET_2(CURSOR_HOT_SPOT, 0,
CURSOR_HOT_SPOT_X, x_hotspot,