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Date:   Tue, 18 Aug 2020 15:33:24 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To:     Krishna Manikandan <mkrishn@codeaurora.org>,
        Emil Velikov <emil.velikov@collabora.com>, robdclark@gmail.com,
        seanpaul@chromium.org, hoegsberg@chromium.org,
        kalyan_t@codeaurora.org, nganji@codeaurora.org
Cc:     dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        freedreno@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, mka@chromium.org,
        linux-arm-msm-owner@vger.kernel.org
Subject: Re: [v2] drm/msm: add shutdown support for display platform_driver
In-Reply-To: <1591009402-681-1-git-send-email-mkrishn@codeaurora.org>
References: <1591009402-681-1-git-send-email-mkrishn@codeaurora.org>
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Hi,

On 2020-06-01 16:33, Krishna Manikandan wrote:
> Define shutdown callback for display drm driver,
> so as to disable all the CRTCS when shutdown
> notification is received by the driver.
> 
> This change will turn off the timing engine so
> that no display transactions are requested
> while mmu translations are getting disabled
> during reboot sequence.
> 
> Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>
> 
> Changes in v2:
> 	- Remove NULL check from msm_pdev_shutdown (Stephen Boyd)
> 	- Change commit text to reflect when this issue
> 	  was uncovered (Sai Prakash Ranjan)
> ---
>  drivers/gpu/drm/msm/msm_drv.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c 
> b/drivers/gpu/drm/msm/msm_drv.c
> index e4b750b..94e3963 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -1322,6 +1322,13 @@ static int msm_pdev_remove(struct 
> platform_device *pdev)
>  	return 0;
>  }
> 
> +static void msm_pdev_shutdown(struct platform_device *pdev)
> +{
> +	struct drm_device *drm = platform_get_drvdata(pdev);
> +
> +	drm_atomic_helper_shutdown(drm);
> +}
> +
>  static const struct of_device_id dt_match[] = {
>  	{ .compatible = "qcom,mdp4", .data = (void *)KMS_MDP4 },
>  	{ .compatible = "qcom,mdss", .data = (void *)KMS_MDP5 },
> @@ -1334,6 +1341,7 @@ static int msm_pdev_remove(struct platform_device 
> *pdev)
>  static struct platform_driver msm_platform_driver = {
>  	.probe      = msm_pdev_probe,
>  	.remove     = msm_pdev_remove,
> +	.shutdown   = msm_pdev_shutdown,
>  	.driver     = {
>  		.name   = "msm",
>  		.of_match_table = dt_match,

Any more comments on this patch?

Thanks,
Sai

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