linux-kernel - Re: [PATCH] drm: hdlcd: Update PM code to save/restore console.

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Message-ID: <ba373315-a1b9-0d2d-4949-bd84ede94a4d@tronnes.org>
Date:   Fri, 16 Jun 2017 18:58:36 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Liviu Dudau <Liviu.Dudau@....com>,
        Mali DP Maintainers <malidp@...s.arm.com>
Cc:     DRI devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm: hdlcd: Update PM code to save/restore console.


Den 16.06.2017 15.53, skrev Liviu Dudau:
> Update the PM code to suspend/resume the fbdev_cma console.
>
> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> ---
>   drivers/gpu/drm/arm/hdlcd_drv.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index d3da87fbd85a..89cd408cde6f 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -13,6 +13,7 @@
>   #include <linux/spinlock.h>
>   #include <linux/clk.h>
>   #include <linux/component.h>
> +#include <linux/console.h>
>   #include <linux/list.h>
>   #include <linux/of_graph.h>
>   #include <linux/of_reserved_mem.h>
> @@ -435,9 +436,15 @@ static int __maybe_unused hdlcd_pm_suspend(struct device *dev)
>   		return 0;
>   
>   	drm_kms_helper_poll_disable(drm);
> +	console_lock();
> +	drm_fbdev_cma_set_suspend(hdlcd->fbdev, 1);
> +	console_unlock();

You can use drm_fbdev_cma_set_suspend_unlocked() instead, it takes the
lock for you and can speed up resume if the lock is contented.

Noralf.


>   
>   	hdlcd->state = drm_atomic_helper_suspend(drm);
>   	if (IS_ERR(hdlcd->state)) {
> +		console_lock();
> +		drm_fbdev_cma_set_suspend(hdlcd->fbdev, 0);
> +		console_unlock();
>   		drm_kms_helper_poll_enable(drm);
>   		return PTR_ERR(hdlcd->state);
>   	}
> @@ -454,8 +461,10 @@ static int __maybe_unused hdlcd_pm_resume(struct device *dev)
>   		return 0;
>   
>   	drm_atomic_helper_resume(drm, hdlcd->state);
> +	console_lock();
> +	drm_fbdev_cma_set_suspend(hdlcd->fbdev, 0);
> +	console_unlock();
>   	drm_kms_helper_poll_enable(drm);
> -	pm_runtime_set_active(dev);
>   
>   	return 0;
>   }