linux-kernel - Re: [PATCH] drm/panel: simple: fix -Wliteral-conversion warning

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Message-ID: <20180809095957.GA21639@ulmo>
Date:   Thu, 9 Aug 2018 11:59:57 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     airlied@...ux.ie, Jagan Teki <jagannadh.teki@...il.com>,
        Rob Herring <robh@...nel.org>,
        Thierry Reding <treding@...dia.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: simple: fix -Wliteral-conversion warning

On Fri, Jun 15, 2018 at 03:37:49PM -0700, Nick Desaulniers wrote:
> Fixes commit 8cfe83419cdb ("drm/panel: simple: Add
> support for KEO TX31D200VM0BAA")
> 
> drivers/gpu/drm/panel/panel-simple.c:1250:27: warning: implicit conversion from
>       'double' to 'u32' (aka 'unsigned int') changes value from 33.5 to 33
>       [-Wliteral-conversion]
>         .vfront_porch = { 6, 21, 33.5 },
>                         ~        ^~~~
> drivers/gpu/drm/panel/panel-simple.c:1251:26: warning: implicit conversion from
>       'double' to 'u32' (aka 'unsigned int') changes value from 33.5 to 33
>       [-Wliteral-conversion]
>         .vback_porch = { 6, 21, 33.5 },
>                        ~        ^~~~
> 
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
> Alternatively, should these be rounded up to 34?  I'm guessing the
> current behaviour (truncation) is correct since that's how the patch was
> operating.

Looks like this is a duplicate of what was merged as:

commit c9b6be7dc13e2f87592ee4c9812cb450dba484d5
Author: Stefan Agner <stefan@...er.ch>
Date:   Thu Apr 19 23:20:03 2018 +0200

    drm/panel: simple: Fix data type in KEO TX31D200VM0BAA timings
    
    All values in a struct struct timing_entry (every entry in
    struct display_timing) require an integer. Choose the closest
    safe integer of 32.
    
    This avoids a warning seen with clang:
      drivers/gpu/drm/panel/panel-simple.c:1250:27: warning: implicit
           conversion from 'double' to 'u32' (aka 'unsigned int')
           changes value from 33.5 to 33 [-Wliteral-conversion]
             .vfront_porch = { 6, 21, 33.5 },
                             ~        ^~~~
      drivers/gpu/drm/panel/panel-simple.c:1251:26: warning: implicit
            conversion from 'double' to 'u32' (aka 'unsigned int')
            changes value from 33.5 to 33 [-Wliteral-conversion]
              .vback_porch = { 6, 21, 33.5 },
                             ~        ^~~~
    
    Signed-off-by: Stefan Agner <stefan@...er.ch>
    Signed-off-by: Thierry Reding <treding@...dia.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20180419212003.8155-1-stefan@agner.ch

Thierry

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