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drm/tegra: 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: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180203051302.9974-6-dhinakaran.pandiyan@intel.com
This commit is contained in:
Dhinakaran Pandiyan 2018-02-02 21:12:58 -08:00 committed by Rodrigo Vivi
parent 9038aa480d
commit 3abe241337
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/tegra/dc.c
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@ -1359,7 +1359,7 @@ static u32 tegra_dc_get_vblank_counter(struct drm_crtc *crtc)
return host1x_syncpt_read(dc->syncpt);
/* fallback to software emulated VBLANK counter */
return drm_crtc_vblank_count(&dc->base);
return (u32)drm_crtc_vblank_count(&dc->base);
}
static int tegra_dc_enable_vblank(struct drm_crtc *crtc)