[PATCH 03/26] drm/amd/display: Fix divide by zero in CURSOR_DST_X_OFFSET calculation

[Fangzhi Zuo]

From: George Shen <george.s...@amd.com>

[Why]
Certain situations cause pipes to have a recout of 0, such as when the
dst_rect lies completely outside of a given ODM slice.

[How]
Skip calculation that transforms cursor coordinates to viewport space.

Reviewed-by: Alvin Lee <alvin.l...@amd.com>
Signed-off-by: Jerry Zuo <jerry....@amd.com>
Signed-off-by: George Shen <george.s...@amd.com>
---
 .../drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c  | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c 
b/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
index f0c45a74c2e5..eb0da6c6b87c 100644
--- a/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
@@ -677,12 +677,23 @@ void hubp401_cursor_set_position(
        int rec_x_offset = x_pos - pos->x_hotspot;
        int rec_y_offset = y_pos - pos->y_hotspot;
        int dst_x_offset;
-       int x_pos_viewport = x_pos * param->viewport.width / 
param->recout.width;
-       int x_hot_viewport = pos->x_hotspot * param->viewport.width / 
param->recout.width;
+       int x_pos_viewport = 0;
+       int x_hot_viewport = 0;
        uint32_t cur_en = pos->enable ? 1 : 0;
 
        hubp->curs_pos = *pos;
 
+       /* Recout is zero for pipes if the entire dst_rect is contained
+        * within preceeding ODM slices.
+        */
+       if (param->recout.width) {
+               x_pos_viewport = x_pos * param->viewport.width / 
param->recout.width;
+               x_hot_viewport = pos->x_hotspot * param->viewport.width / 
param->recout.width;
+       } else {
+               ASSERT(!cur_en || x_pos == 0);
+               ASSERT(!cur_en || pos->x_hotspot == 0);
+       }
+
        /*
         * Guard aganst cursor_set_position() from being called with invalid
         * attributes
-- 
2.34.1