linux-kernel - Re: [PATCH v5 4/7] drm/msm/dp: move parser->parse() and dp_power_client

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Date:   Fri, 6 Oct 2023 14:37:14 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
        vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
        agross@...nel.org, andersson@...nel.org
Cc:     quic_abhinavk@...cinc.com, quic_jesszhan@...cinc.com,
        quic_sbillaka@...cinc.com, marijn.suijten@...ainline.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/7] drm/msm/dp: move parser->parse() and
 dp_power_client_init() to probe

On 04/10/2023 19:26, Kuogee Hsieh wrote:
> Original both parser->parse() and dp_power_client_init() are done at
> dp_display_bind() since eDP population is done at binding time.
> In the preparation of having eDP population done at probe() time,
> move both function from dp_display_bind() to dp_display_probe().
> 
> Changes in v4:
> -- explain why parser->parse() and dp_power_client_init() are moved to probe time
> -- tear down sub modules if failed
> 
> Changes in v4:
> -- split this patch out of "incorporate pm_runtime framework into DP driver" patch
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/dp/dp_display.c | 22 ++++++++++++----------
>   1 file changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 32663ea..e4942fc 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -276,11 +276,6 @@ static int dp_display_bind(struct device *dev, struct device *master,
>   	dp->dp_display.drm_dev = drm;
>   	priv->dp[dp->id] = &dp->dp_display;
>   
> -	rc = dp->parser->parse(dp->parser);
> -	if (rc) {
> -		DRM_ERROR("device tree parsing failed\n");
> -		goto end;
> -	}
>   
>   
>   	dp->drm_dev = drm;
> @@ -291,11 +286,6 @@ static int dp_display_bind(struct device *dev, struct device *master,
>   		goto end;
>   	}
>   
> -	rc = dp_power_client_init(dp->power);

As we have moved dp_power_client_init() from bind() to probe(), we 
should also move dp_power_client_deinit() to remove(). Otherwise after 
several bind/unbind attempts the pm enablement count can become negative.

> -	if (rc) {
> -		DRM_ERROR("Power client create failed\n");
> -		goto end;
> -	}
>   
>   	rc = dp_register_audio_driver(dev, dp->audio);
>   	if (rc) {
> @@ -1250,6 +1240,18 @@ static int dp_display_probe(struct platform_device *pdev)
>   		return -EPROBE_DEFER;
>   	}
>   
> +	rc = dp->parser->parse(dp->parser);
> +	if (rc) {
> +		DRM_ERROR("device tree parsing failed\n");
> +		goto err;
> +	}
> +
> +	rc = dp_power_client_init(dp->power);
> +	if (rc) {
> +		DRM_ERROR("Power client create failed\n");
> +		goto err;
> +	}
> +
>   	/* setup event q */
>   	mutex_init(&dp->event_mutex);
>   	init_waitqueue_head(&dp->event_q);

-- 
With best wishes
Dmitry