drm/radeon: Handle 64-bit return from drm_crtc_vblank_count()

570e86963a51 ("drm: Widen vblank count to 64-bits [v3]") changed the
return type for drm_crtc_vblank_count() to u64. This could cause
potential problems if the return value is used in arithmetic operations
with a 32-bit reference HW vblank count. Explicitly typecasting this down
to u32 either fixes a potential problem or serves to add clarity in case
the implicit typecasting was already correct.

Cc: Keith Packard <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Harry Wentland <[email protected]>
Signed-off-by: Dhinakaran Pandiyan <[email protected]>
Reviewed-by: Keith Packard <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index dfda5e0ed1660d3d91344749aae48fd39a229dc4..26129b2b082dfb3f0e4743c6e56ddad40c4737be 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -570,7 +570,7 @@ static int radeon_crtc_page_flip_target(struct drm_crtc *crtc,
                base &= ~7;
        }
        work->base = base;
-       work->target_vblank = target - drm_crtc_vblank_count(crtc) +
+       work->target_vblank = target - (uint32_t)drm_crtc_vblank_count(crtc) +
                dev->driver->get_vblank_counter(dev, work->crtc_id);
 
        /* We borrow the event spin lock for protecting flip_work */