linux-kernel - Re: [PATCH v1 1/2] drm/msm: enable msm irq after all initializations are done successfully at msm_drm

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Date:   Mon, 6 Jun 2022 10:40:36 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...ux.ie>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <bjorn.andersson@...aro.org>
CC:     <quic_abhinavk@...cinc.com>, <quic_aravindh@...cinc.com>,
        <quic_sbillaka@...cinc.com>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] drm/msm: enable msm irq after all initializations
 are done successfully at msm_drm_init()

I will drop this patch since the problem had been fixed by Dmitry 
Baryshkov patch.

https://gitlab.freedesktop.org/drm/msm/-/commit/577e2a9dfc8fba7938aaf75db63fae7e328cc3cb



On 6/3/2022 2:28 PM, Kuogee Hsieh wrote:
> At msm initialize phase, msm_drm_init() is called to initialize modules
> sequentially. It will call msm_drm_uninit() to clean up initialized phase
> if any module initialization return failed. This patch move msm_irq_install()
> to the last step of msm_drm_init() after all modules are initialized successfully
> so that no msm_irq_unistall() required at msm_drm_uninit() if any module
> initialization failed happen at msm_drm_init().
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/msm_drv.c | 29 ++++++-----------------------
>   1 file changed, 6 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 6665c5a..ab42e9a 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -132,15 +132,6 @@ static int msm_irq_install(struct drm_device *dev, unsigned int irq)
>   	return 0;
>   }
>   
> -static void msm_irq_uninstall(struct drm_device *dev)
> -{
> -	struct msm_drm_private *priv = dev->dev_private;
> -	struct msm_kms *kms = priv->kms;
> -
> -	kms->funcs->irq_uninstall(kms);
> -	free_irq(kms->irq, dev);
> -}
> -
>   struct msm_vblank_work {
>   	struct work_struct work;
>   	int crtc_id;
> @@ -232,10 +223,6 @@ static int msm_drm_uninit(struct device *dev)
>   
>   	drm_mode_config_cleanup(ddev);
>   
> -	pm_runtime_get_sync(dev);
> -	msm_irq_uninstall(ddev);
> -	pm_runtime_put_sync(dev);
> -
>   	if (kms && kms->funcs)
>   		kms->funcs->destroy(kms);
>   
> @@ -437,16 +424,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
>   		goto err_msm_uninit;
>   	}
>   
> -	if (kms) {
> -		pm_runtime_get_sync(dev);
> -		ret = msm_irq_install(ddev, kms->irq);
> -		pm_runtime_put_sync(dev);
> -		if (ret < 0) {
> -			DRM_DEV_ERROR(dev, "failed to install IRQ handler\n");
> -			goto err_msm_uninit;
> -		}
> -	}
> -
>   	ret = drm_dev_register(ddev, 0);
>   	if (ret)
>   		goto err_msm_uninit;
> @@ -467,6 +444,12 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
>   	if (ret)
>   		goto err_msm_uninit;
>   
> +	if (kms) {
> +		pm_runtime_get_sync(dev);
> +		msm_irq_install(ddev, kms->irq);
> +		pm_runtime_put_sync(dev);
> +	}
> +
>   	drm_kms_helper_poll_init(ddev);
>   
>   	return 0;