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From ddb3b436f628535ac9e8e0fd0be9e6e62cc94e61 Mon Sep 17 00:00:00 2001
From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Date: Fri, 2 Feb 2018 21:12:56 -0800
Subject: [PATCH 5372/5725] drm/amdgpu: 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 typecasting was implicitly done.
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>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com> for both this patch
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180203051302.9974-4-dhinakaran.pandiyan@intel.com
Signed-off-by: Raveendra Talabattula <raveendra.talabattula@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 2 +-
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 36e3ddf..e00b594 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -214,7 +214,7 @@ int amdgpu_display_crtc_page_flip_target(struct drm_crtc *crtc,
amdgpu_bo_unreserve(new_abo);
work->base = amdgpu_bo_gpu_offset(new_abo);
- work->target_vblank = target - drm_crtc_vblank_count(crtc) +
+ work->target_vblank = target - (uint32_t)drm_crtc_vblank_count(crtc) +
amdgpu_get_vblank_counter_kms(dev, work->crtc_id);
/* we borrow the event spin lock for protecting flip_wrok */
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 569a75e..641f715 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4354,7 +4354,7 @@ static void amdgpu_dm_do_flip(struct drm_crtc *crtc,
/* Prepare wait for target vblank early - before the fence-waits */
- target_vblank = target - drm_crtc_vblank_count(crtc) +
+ target_vblank = target - (uint32_t)drm_crtc_vblank_count(crtc) +
amdgpu_get_vblank_counter_kms(crtc->dev, acrtc->crtc_id);
/*
@@ -4597,7 +4597,7 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
amdgpu_dm_do_flip(
crtc,
fb,
- drm_crtc_vblank_count(crtc) + *wait_for_vblank,
+ (uint32_t)drm_crtc_vblank_count(crtc) + *wait_for_vblank,
dm_state->context);
}
--
2.7.4
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