[Intel-gfx] [PATCH 3/5] drm/i915: Don't store panning coordinates as 16.16 fixed point

[Matt Roper]

When using the universal plane interface, the source rectangle
coordinates define the panning offset for the primary plane, which needs
to be stored in crtc->{x,y}.  The original universal plane code
negelected to set these panning offset fields, which was partially
remedied in:

        commit ccc759dc2a0214fd8b65ed4ebe78050874a67f94
        Author: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
        Date:   Wed Sep 24 14:20:22 2014 -0300

            drm/i915: Merge of visible and !visible paths for primary planes

However the plane source coordinates are provided in 16.16 fixed point
format and the above commit forgot to convert back to integer
coordinates before saving the values.  When we replace
intel_pipe_set_base() with plane->funcs->update_plane() in a future
patch, this bug becomes visible via the set_config entrypoint as well as
update_plane.

Cc: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
Testcase: igt/kms_plane
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8dbc0e9..1c1886e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11668,8 +11668,8 @@ intel_commit_primary_plane(struct drm_plane *plane,
 	struct drm_rect *src = &state->src;
 
 	crtc->primary->fb = fb;
-	crtc->x = src->x1;
-	crtc->y = src->y1;
+	crtc->x = src->x1 >> 16;
+	crtc->y = src->y1 >> 16;
 
 	intel_plane->crtc_x = state->orig_dst.x1;
 	intel_plane->crtc_y = state->orig_dst.y1;
-- 
1.8.5.1