Re: [PATCH] drm/amd/powerplay: work around enum conversion warnings

[Nathan Chancellor <natechancellor@gmail.com>]

Hi Arnd,

On Mon, Jul 08, 2019 at 03:57:06PM +0200, Arnd Bergmann wrote:
> A couple of calls to smu_get_current_clk_freq() and smu_force_clk_levels()
> pass constants of the wrong type, leading to warnings with clang-8:
> 
> drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:995:39: error: implicit conversion from enumeration type 'PPCLK_e' to different enumeration type 'enum smu_clk_type' [-Werror,-Wenum-conversion]
>                 ret = smu_get_current_clk_freq(smu, PPCLK_SOCCLK, &now);
>                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/amd/amdgpu/../powerplay/inc/amdgpu_smu.h:775:82: note: expanded from macro 'smu_get_current_clk_freq'
>         ((smu)->funcs->get_current_clk_freq? (smu)->funcs->get_current_clk_freq((smu), (clk_id), (value)) : 0)
> 
> I could not figure out what the purpose is of mixing the types
> like this and if it is written like this intentionally.
> Assuming this is all correct, adding an explict case is an
> easy way to shut up the warnings.
> 
> Fixes: bc0fcffd36ba ("drm/amd/powerplay: Unify smu handle task function (v2)")
> Fixes: 096761014227 ("drm/amd/powerplay: support sysfs to get socclk, fclk, dcefclk")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

I sent a series last week for all of the clang warnings that were added
in this driver recently.

https://lore.kernel.org/lkml/20190704055217.45860-1-natechancellor@gmail.com/

I think it is safe to use the CLK enums from the expected type (from
what I could see from going down the code flow rabbit hole).

https://lore.kernel.org/lkml/20190704055217.45860-4-natechancellor@gmail.com/

https://lore.kernel.org/lkml/20190704055217.45860-7-natechancellor@gmail.com/

Cheers,
Nathan