linux-kernel - Re: [PATCH v8 drm-dp 5/9] drm/hisilicon/hibmc: Getting connector info and EDID by using AUX channel

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Message-ID: <7giy3wpm4xyth6ol7wvfg5r446lmmdftw656vwdhbyzs6xrewh@25etguysdhqh>
Date: Sun, 30 Mar 2025 20:49:11 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongbang Shi <shiyongbang@...wei.com>
Cc: xinliang.liu@...aro.org, tiantao6@...ilicon.com,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        kong.kongxinwei@...ilicon.com, liangjian010@...wei.com,
        chenjianmin@...wei.com, lidongming5@...wei.com, libaihan@...wei.com,
        shenjian15@...wei.com, shaojijie@...wei.com,
        jani.nikula@...ux.intel.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 drm-dp 5/9] drm/hisilicon/hibmc: Getting connector
 info and EDID by using AUX channel

On Thu, Mar 20, 2025 at 06:14:51PM +0800, Yongbang Shi wrote:
> From: Baihan Li <libaihan@...wei.com>
> 
> Add registering drm_aux and use it to get connector edid with drm
> functions. Add ddc channel in connector initialization to put drm_aux
> in drm_connector.
> 
> Signed-off-by: Baihan Li <libaihan@...wei.com>
> Signed-off-by: Yongbang Shi <shiyongbang@...wei.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> ChangeLog:
> v7 -> v8:
>   - use drm_edid_read() in hibmc_dp_connector_get_modes(), suggested by Jani Nikula
> v6 -> v7:
>   - add if statement about drm aux in hibmc_dp_connector_get_modes(), suggested by Jani Nikula
> v5 -> v6:
>   - move the detect_ctx() to the patch 7/9.
> v2 -> v3:
>   - Capitalized EDID and AUX, suggested by Dmitry Baryshkov.
> v1 -> v2:
>   - deleting type conversion, suggested by Dmitry Baryshkov.
>   - deleting hibmc_dp_connector_get_modes() and using drm_connector_helper_get_modes(), suggested by Dmitry Baryshkov.
> ---
>  drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c   |  3 +-
>  .../gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c    | 31 ++++++++++++++++---
>  .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h   |  5 +++
>  3 files changed, 33 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
> index ded9e7ce887a..e0bb9b14d9d8 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
> @@ -161,7 +161,8 @@ void hibmc_dp_aux_init(struct hibmc_dp *dp)
>  				 HIBMC_DP_MIN_PULSE_NUM);
>  
>  	dp->aux.transfer = hibmc_dp_aux_xfer;
> -	dp->aux.is_remote = 0;
> +	dp->aux.name = kasprintf(GFP_KERNEL, "HIBMC DRM dp aux");

As being discussed in the feedback for v7, this is a memory leak. Can
you simply assign the string here?

> +	dp->aux.drm_dev = dp->drm_dev;
>  	drm_dp_aux_init(&dp->aux);
>  	dp->dp_dev->aux = &dp->aux;
>  }

-- 
With best wishes
Dmitry