linux-kernel - Re: [PATCH 3/3] drm/amd/display: drop unused count variable in create_eml

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Message-ID: <87a5uj7152.fsf@intel.com>
Date:   Tue, 22 Aug 2023 14:43:53 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>,
        amd-gfx@...ts.freedesktop.org
Cc:     Wenjing Liu <wenjing.liu@....com>, dri-devel@...ts.freedesktop.org,
        Hamza Mahfooz <hamza.mahfooz@....com>,
        Jun Lei <Jun.Lei@....com>, Nasir Osman <nasir.osman@....com>,
        kernel test robot <lkp@...el.com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Stylon Wang <stylon.wang@....com>, Leo Li <sunpeng.li@....com>,
        pengfuyuan <pengfuyuan@...inos.cn>,
        Hersen Wu <hersenxs.wu@....com>,
        Mike Hsieh <Mike.Hsieh@....com>,
        Hans de Goede <hdegoede@...hat.com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>, linux-kernel@...r.kernel.org,
        Leon Huang <Leon.Huang1@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH 3/3] drm/amd/display: drop unused count variable in
 create_eml_sink()

On Wed, 17 May 2023, Hamza Mahfooz <hamza.mahfooz@....com> wrote:
> Since, we are only interested in having
> drm_edid_override_connector_update(), update the value of
> connector->edid_blob_ptr. We don't care about the return value of
> drm_edid_override_connector_update() here. So, drop count.
>
> Fixes: 068553e14f86 ("drm/amd/display: assign edid_blob_ptr with edid from debugfs")

The *real* problems with that commit are:

1) It uses drm_edid_override_connector_update() *at all*. Its
   documentation says:

	Only to be used from drm_helper_probe_single_connector_modes()
	as a fallback for when DDC probe failed during drm_get_edid()
	and caused the override/firmware EDID to be skipped.

2) It messes with edid_blob_ptr directly. All drivers should stop doing
   that. It just complicates all the logic in the overrides and the
   property updates.


BR,
Jani.


> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 14b296e1d0f6..5a2d04f47276 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -6396,9 +6396,8 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
>  		/* if connector->edid_override valid, pass
>  		 * it to edid_override to edid_blob_ptr
>  		 */
> -		int count;
>  
> -		count = drm_edid_override_connector_update(&aconnector->base);
> +		drm_edid_override_connector_update(&aconnector->base);
>  
>  		if (!aconnector->base.edid_blob_ptr) {
>  			DRM_ERROR("No EDID firmware found on connector: %s ,forcing to OFF!\n",

-- 
Jani Nikula, Intel Open Source Graphics Center