redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

drm/amd/display: Translate cursor position by source rect

Browse source 
[Why]
Cursor is drawn as part of the framebuffer for a plane on AMD hardware.
The cursor position on the framebuffer does not change even if the
source rect viewport for the cursor does. This causes the cursor to be
clipped.

The following IGT tests fail as a result of this issue:

- kms_plane_cursor@pipe-*-viewport-size-*

[How]
Offset cursor position by plane source rect viewport. If the viewport
is unscaled then the cursor is now correctly positioned on any
plane - primary or overlay.

There is still a hardware limitation for dealing with the cursor size
being incorrectly scaled but that's not something we can address.

Add some documentation explaining some of this in the code while we're
at it.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Zhan Liu <Zhan.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2020-04-05 16:40:53 -04:00 committed by Alex Deucher
parent 346d8a0a3c
commit e99acf7d1a
1 changed files with 33 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
View file

@ -3021,12 +3021,44 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
int x_pos = pos_cpy.x;
int y_pos = pos_cpy.y;
// translate cursor from stream space to plane space
/**
* DC cursor is stream space, HW cursor is plane space and drawn
* as part of the framebuffer.
*
* Cursor position can't be negative, but hotspot can be used to
* shift cursor out of the plane bounds. Hotspot must be smaller
* than the cursor size.
*/
/**
* Translate cursor from stream space to plane space.
*
* If the cursor is scaled then we need to scale the position
* to be in the approximately correct place. We can't do anything
* about the actual size being incorrect, that's a limitation of
* the hardware.
*/
x_pos = (x_pos - x_plane) * pipe_ctx->plane_state->src_rect.width /
pipe_ctx->plane_state->dst_rect.width;
y_pos = (y_pos - y_plane) * pipe_ctx->plane_state->src_rect.height /
pipe_ctx->plane_state->dst_rect.height;
/**
* If the cursor's source viewport is clipped then we need to
* translate the cursor to appear in the correct position on
* the screen.
*
* This translation isn't affected by scaling so it needs to be
* done *after* we adjust the position for the scale factor.
*/
x_pos += pipe_ctx->plane_state->src_rect.x;
y_pos += pipe_ctx->plane_state->src_rect.y;
/**
* If the position is negative then we need to add to the hotspot
* to shift the cursor outside the plane.
*/
if (x_pos < 0) {
pos_cpy.x_hotspot -= x_pos;
x_pos = 0;