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

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Message-ID: <45f3c59a-2c8f-6053-ab05-919b73240e8a@amd.com>
Date:   Thu, 25 Jul 2019 17:26:06 +0000
From:   "Li, Sun peng (Leo)" <Sunpeng.Li@....com>
To:     "Kazlauskas, Nicholas" <Nicholas.Kazlauskas@....com>,
        "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:     David Airlie <airlied@...ux.ie>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: Re: [PATCH 5/7] drm/amd/display: Use proper enum conversion functions

On 2019-07-25 12:14 p.m., Kazlauskas, Nicholas wrote:
> On 7/25/19 12:00 PM, Li, Sun peng (Leo) wrote:
>>
>>
>> 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>
> 
> Looks mostly like the table just needs to be sized properly:
> 
> 	static int dc_clk_type_map[] = {
> ->
> 	static int dc_clk_type_map[DM_PP_CLOCK_TYPE_NUM_TYPES] = {
> 
> where DM_PP_CLOCK_TYPE_NUM_TYPES would be added to enum dm_pp_clock_type.
> 
> Or it could just use a switch table instead, like the other function does.
> 
> Nicholas Kazlauskas

Good catch, I'll spin up something quick.

Leo

> 
> 
>>
>>>>   						       &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
>>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>>
> 

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