Re: [PATCH v2 5/9] drm/rockchip: vop: Enable pm domain when resetting vop

[Sean Paul]

On Sat, Apr 01, 2017 at 07:35:25PM +0800, Jeffy Chen wrote:

Hi Jeffy,
Could you please add commit messages describing *why* you're making the change?
It might be obvious to you (and maybe me), but others will benefit from better
descriptions.

> Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
> ---
> 
> Changes in v2: None
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 31 +++++++++++++++++++----------
>  1 file changed, 21 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 76c79ac..1d85319 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -1365,6 +1365,12 @@ static int vop_initial(struct vop *vop)
>  		return ret;
>  	}
>  
> +	ret = pm_runtime_get_sync(vop->dev);
> +	if (ret < 0) {
> +		dev_err(vop->dev, "failed to get pm runtime: %d\n", ret);
> +		goto err_put_pm_runtime;

This should go to err_unprepare_dclk, the next error condition should go to
err_put_pm_runtime

> +	}
> +
>  	/* Enable both the hclk and aclk to setup the vop */
>  	ret = clk_prepare_enable(vop->hclk);
>  	if (ret < 0) {
> @@ -1422,6 +1428,8 @@ static int vop_initial(struct vop *vop)
>  
>  	vop->is_enabled = false;
>  
> +	pm_runtime_put_sync(vop->dev);
> +
>  	return 0;
>  
>  err_disable_aclk:
> @@ -1430,6 +1438,8 @@ static int vop_initial(struct vop *vop)
>  	clk_disable_unprepare(vop->hclk);
>  err_unprepare_dclk:
>  	clk_unprepare(vop->dclk);
> +err_put_pm_runtime:
> +	pm_runtime_put_sync(vop->dev);

Should be above err_unprepare_dclk

>  	return ret;
>  }
>  
> @@ -1530,12 +1540,6 @@ static int vop_bind(struct device *dev, struct device *master, void *data)
>  	if (!vop->regsbak)
>  		return -ENOMEM;
>  
> -	ret = vop_initial(vop);
> -	if (ret < 0) {
> -		dev_err(&pdev->dev, "cannot initial vop dev - err %d\n", ret);
> -		return ret;
> -	}
> -
>  	irq = platform_get_irq(pdev, 0);
>  	if (irq < 0) {
>  		dev_err(dev, "cannot find irq for vop\n");
> @@ -1556,15 +1560,22 @@ static int vop_bind(struct device *dev, struct device *master, void *data)
>  	/* IRQ is initially disabled; it gets enabled in power_on */
>  	disable_irq(vop->irq);
>  
> +	pm_runtime_enable(&pdev->dev);
> +
> +	ret = vop_initial(vop);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "cannot initial vop dev - err %d\n", ret);
> +		goto err_disable_pm_runtime;
> +	}

This function move would be a lot easier to understand with a commit message ;-)

> +
>  	ret = vop_create_crtc(vop);
>  	if (ret)
> -		goto err_enable_irq;
> -
> -	pm_runtime_enable(&pdev->dev);
> +		goto err_disable_pm_runtime;

Do you have anything to clean up from vop_initial()?

>  
>  	return 0;
>  
> -err_enable_irq:
> +err_disable_pm_runtime:
> +	pm_runtime_disable(&pdev->dev);
>  	enable_irq(vop->irq); /* To balance out the disable_irq above */
>  	return ret;
>  }
> -- 
> 2.1.4
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS