linux-kernel - [PATCH] drm/amd/display: Use memset to initialize variables in fill_plane_dcc

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Message-Id: <20190201201226.12812-1-natechancellor@gmail.com>
Date:   Fri,  1 Feb 2019 13:12:26 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] drm/amd/display: Use memset to initialize variables in fill_plane_dcc_attributes

Clang warns:

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:2314:38:
warning: suggest braces around initialization of subobject
[-Wmissing-braces]
        struct dc_surface_dcc_cap output = {0};
                                            ^
                                            {}

Previous efforts to fix this type of warning by adding or removing
braces have been met with some pushback in favor of using memset [1][2].
Do that here, mirroring commit 05794eff1aa6 ("drm/amdgpu/gmc: fix
compiler errors [-Werror,-Wmissing-braces] (V2)") in this tree.

[1]: https://lore.kernel.org/lkml/022e41c0-8465-dc7a-a45c-64187ecd9684@amd.com/
[2]: https://lore.kernel.org/lkml/20181128.215241.702406654469517539.davem@davemloft.net/

Fixes: 7df7e505e82a ("drm/amd/display: Set requested plane state DCC params for GFX9")
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

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 dccad2d207ce..1c1c162c4eee 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2310,12 +2310,15 @@ static bool fill_plane_dcc_attributes(struct amdgpu_device *adev,
 				      uint64_t info)
 {
 	struct dc *dc = adev->dm.dc;
-	struct dc_dcc_surface_param input = {0};
-	struct dc_surface_dcc_cap output = {0};
+	struct dc_dcc_surface_param input;
+	struct dc_surface_dcc_cap output;
 	uint32_t offset = AMDGPU_TILING_GET(info, DCC_OFFSET_256B);
 	uint32_t i64b = AMDGPU_TILING_GET(info, DCC_INDEPENDENT_64B) != 0;
 	uint64_t dcc_address;
 
+	memset(&input, 0, sizeof(input));
+	memset(&output, 0, sizeof(output));
+
 	if (!offset)
 		return false;
 
-- 
2.20.1