drm/radeon: Handle 64-bit return from drm_crtc_vblank_count()
570e86963a
("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 <keithp@keithp.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180203051302.9974-5-dhinakaran.pandiyan@intel.com
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@ -570,7 +570,7 @@ static int radeon_crtc_page_flip_target(struct drm_crtc *crtc,
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base &= ~7;
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}
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work->base = base;
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work->target_vblank = target - drm_crtc_vblank_count(crtc) +
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work->target_vblank = target - (uint32_t)drm_crtc_vblank_count(crtc) +
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dev->driver->get_vblank_counter(dev, work->crtc_id);
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/* We borrow the event spin lock for protecting flip_work */
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