linux-kernel - Re: [PATCH] drm/amd/display: fix dp_retrieve_lttpr

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Message-ID: <CADnq5_PF7j+X6_o7tVrnhnKhSY9=gASSgxzpTwPJ7WEq=YsR+Q@mail.gmail.com>
Date:   Wed, 18 Jan 2023 11:27:31 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Lewis Huang <Lewis.Huang@....com>,
        Wesley Chalmers <Wesley.Chalmers@....com>,
        Arnd Bergmann <arnd@...db.de>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Wenjing Liu <wenjing.liu@....com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH] drm/amd/display: fix dp_retrieve_lttpr_cap() return value

Applied.  Thanks!

Alex

On Wed, Jan 18, 2023 at 4:30 AM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> gcc-13 notices a mismatch between the return type of dp_retrieve_lttpr_cap()
> and the returned value:
>
> drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_dp_capability.c: In function 'dp_retrieve_lttpr_cap':
> drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_dp_capability.c:1465:24: error: implicit conversion from 'enum <anonymous>' to 'enum dc_status' [-Werror=enum-conversion]
>  1465 |                 return false;
>       |                        ^~~~~
>
> Change the value to an actual dc_status code and remove the bogus
> initialization that was apparently meant to get returned here.
>
> Fixes: b473bd5fc333 ("drm/amd/display: refine wake up aux in retrieve link caps")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpu/drm/amd/display/dc/link/link_dp_capability.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/link_dp_capability.c
> index 088f4291bfbf..e72ad1b8330f 100644
> --- a/drivers/gpu/drm/amd/display/dc/link/link_dp_capability.c
> +++ b/drivers/gpu/drm/amd/display/dc/link/link_dp_capability.c
> @@ -1455,14 +1455,14 @@ static bool dpcd_read_sink_ext_caps(struct dc_link *link)
>  enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link)
>  {
>         uint8_t lttpr_dpcd_data[8];
> -       enum dc_status status = DC_ERROR_UNEXPECTED;
> -       bool is_lttpr_present = false;
> +       enum dc_status status;
> +       bool is_lttpr_present;
>
>         /* Logic to determine LTTPR support*/
>         bool vbios_lttpr_interop = link->dc->caps.vbios_lttpr_aware;
>
>         if (!vbios_lttpr_interop || !link->dc->caps.extended_aux_timeout_support)
> -               return false;
> +               return DC_ERROR_UNEXPECTED;
>
>         /* By reading LTTPR capability, RX assumes that we will enable
>          * LTTPR extended aux timeout if LTTPR is present.
> --
> 2.39.0
>