linux-kernel - Re: [PATCH 5/7] drm/amd/display: Use proper enum conversion functions

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Message-ID: <5f0e8332-50ae-cc9c-1a12-5a097c51297d@amd.com>
Date:   Thu, 25 Jul 2019 16:00:10 +0000
From:   "Li, Sun peng (Leo)" <Sunpeng.Li@....com>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Zhou, David(ChunMing)" <David1.Zhou@....com>,
        "Wentland, Harry" <Harry.Wentland@....com>,
        Rex Zhu <rex.zhu@....com>, "Quan, Evan" <Evan.Quan@....com>
CC:     Nathan Chancellor <natechancellor@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH 5/7] drm/amd/display: Use proper enum conversion functions



On 2019-07-18 11:16 p.m., Nathan Chancellor wrote:
> On Wed, Jul 03, 2019 at 10:52:16PM -0700, Nathan Chancellor wrote:
>> clang warns:
>>
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_pp_smu.c:336:8:
>> warning: implicit conversion from enumeration type 'enum smu_clk_type'
>> to different enumeration type 'enum amd_pp_clock_type'
>> [-Wenum-conversion]
>>                                         dc_to_smu_clock_type(clk_type),
>>                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_pp_smu.c:421:14:
>> warning: implicit conversion from enumeration type 'enum
>> amd_pp_clock_type' to different enumeration type 'enum smu_clk_type'
>> [-Wenum-conversion]
>>                                         dc_to_pp_clock_type(clk_type),
>>                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> There are functions to properly convert between all of these types, use
>> them so there are no longer any warnings.
>>
>> Fixes: a43913ea50a5 ("drm/amd/powerplay: add function get_clock_by_type_with_latency for navi10")
>> Fixes: e5e4e22391c2 ("drm/amd/powerplay: add interface to get clock by type with latency for display (v2)")
>> Link: https://github.com/ClangBuiltLinux/linux/issues/586
>> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
>> ---
>>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c
>> index eac09bfe3be2..0f76cfff9d9b 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c
>> @@ -333,7 +333,7 @@ bool dm_pp_get_clock_levels_by_type(
>>  		}
>>  	} else if (adev->smu.funcs && adev->smu.funcs->get_clock_by_type) {
>>  		if (smu_get_clock_by_type(&adev->smu,
>> -					  dc_to_smu_clock_type(clk_type),
>> +					  dc_to_pp_clock_type(clk_type),

smu_funcs->get_clock_by_type doesn't seem to be hooked up anywhere,
so this looks to be the most correct.

Although it makes more sense to use smu_clk_types here rather than
amd_pp_clock_type - any reason why this isn't the case?

>>  					  &pp_clks)) {
>>  			get_default_clock_levels(clk_type, dc_clks);
>>  			return true;
>> @@ -418,7 +418,7 @@ bool dm_pp_get_clock_levels_by_type_with_latency(
>>  			return false;
>>  	} else if (adev->smu.ppt_funcs && adev->smu.ppt_funcs->get_clock_by_type_with_latency) {
>>  		if (smu_get_clock_by_type_with_latency(&adev->smu,
>> -						       dc_to_pp_clock_type(clk_type),
>> +						       dc_to_smu_clock_type(clk_type),

This is slightly concerning. The functions are doing the right thing,
but amd_pp_clock_type doesn't map 1-1 to smu_clk_type... In any case,
this looks good to me.

Reviewed-by: Leo Li <sunpeng.li@....com>

>>  						       &pp_clks))
>>  			return false;
>>  	}
>> -- 
>> 2.22.0
>>
> 
> Gentle ping for review, this is the last remaining warning that I see
> from amdgpu on next-20190718.
> 
> Cheers,
> Nathan
>