linux-kernel - Re: [PATCH v2] drm/amd/display: Use proper enums in process_channel

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Date:   Thu, 27 Sep 2018 11:08:16 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2] drm/amd/display: Use proper enums in
 process_channel_reply

On Thu, Sep 27, 2018 at 11:06:33AM -0700, Nathan Chancellor wrote:
> Clang warns when one enumerated type is implicitly converted to another.
> 
> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_aux.c:315:19: warning:
> implicit conversion from enumeration type 'enum
> aux_channel_operation_result' to different enumeration type 'enum
> aux_transaction_reply' [-Wenum-conversion]
>                 reply->status = AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON;
>                               ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/amd/amdgpu/../display/dc/i2caux/dce110/aux_engine_dce110.c:349:19:
> warning: implicit conversion from enumeration type 'enum
> aux_channel_operation_result' to different enumeration type 'enum
> aux_transaction_reply' [-Wenum-conversion]
>                 reply->status = AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON;
>                               ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> The current enum is incorrect, it should be from aux_transaction_reply,
> so use AUX_TRANSACTION_REPLY_HPD_DISCON.
> 
> Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
> 
> v1 -> v2:
> 
> * Rather than change status to an integer, use the proper enumerated
>   type from aux_transaction reply as suggested by Nick and confirmed
>   by Henry.

Sigh Harry, sorry...

> 
>  drivers/gpu/drm/amd/display/dc/dce/dce_aux.c                    | 2 +-
>  .../gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c    | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> index 3f5b2e6f7553..aaeb7faac0c4 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> @@ -312,7 +312,7 @@ static void process_channel_reply(
>  
>  	/* in case HPD is LOW, exit AUX transaction */
>  	if ((sw_status & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) {
> -		reply->status = AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON;
> +		reply->status = AUX_TRANSACTION_REPLY_HPD_DISCON;
>  		return;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c b/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c
> index 8eee8ace1259..59c3ed43d609 100644
> --- a/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c
> +++ b/drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c
> @@ -346,7 +346,7 @@ static void process_channel_reply(
>  
>  	/* in case HPD is LOW, exit AUX transaction */
>  	if ((sw_status & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) {
> -		reply->status = AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON;
> +		reply->status = AUX_TRANSACTION_REPLY_HPD_DISCON;
>  		return;
>  	}
>  
> -- 
> 2.19.0
>