[PATCH] drm/amd/display: Use memset to initialize variables in fill_plane_dcc_attributes

[PATCH] drm/amd/display: Use memset to initialize variables in fill_plane_dcc_attributes

[Nathan Chancellor]

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@gmail.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

Re: [PATCH] drm/amd/display: Use memset to initialize variables in fill_plane_dcc_attributes

[Alex Deucher]

On Fri, Feb 1, 2019 at 3:25 PM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> 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@gmail.com>

Applied all three patches.  Thanks!

Alex

> ---
>  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
>
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