linux-kernel - RE: [v1] drm/arm/mali-dp: Add a loop around the second set CVAL and try 5 times

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Date:   Wed, 8 May 2019 10:33:04 +0000
From:   Wen He <wen.he_1@....com>
To:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "liviu.dudau@....com" <liviu.dudau@....com>,
        "brian.starkey@....com" <brian.starkey@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Leo Li <leoyang.li@....com>
Subject: RE: [v1] drm/arm/mali-dp: Add a loop around the second set CVAL and
 try 5 times



> -----Original Message-----
> From: Wen He
> Sent: 2019年5月8日 17:39
> To: dri-devel@...ts.freedesktop.org; liviu.dudau@....com;
> brian.starkey@....com
> Cc: Leo Li <leoyang.li@....com>; Wen He <wen.he_1@....com>
> Subject: [v1] drm/arm/mali-dp: Add a loop around the second set CVAL and try
> 5 times
> 
> This patch trying to fix monitor freeze issue caused by drm error 'flip_done
> timed out' on LS1028A platform. this set try is make a loop around the second
> setting CVAL and try like 5 times before giveing up.
> 
> Signed-off-by: Liviu <liviu.Dudau@....com>
> Signed-off-by: Wen He <wen.he_1@....com>
> ---
>  drivers/gpu/drm/arm/malidp_drv.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c
> b/drivers/gpu/drm/arm/malidp_drv.c
> index 21725c9b9f5e..18cb7f134f4e 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -192,6 +192,7 @@ static void malidp_atomic_commit_hw_done(struct
> drm_atomic_state *state)  {
>  	struct drm_device *drm = state->dev;
>  	struct malidp_drm *malidp = drm->dev_private;
> +	int loop = 5;
> 
>  	malidp->event = malidp->crtc.state->event;
>  	malidp->crtc.state->event = NULL;
> @@ -206,8 +207,18 @@ static void malidp_atomic_commit_hw_done(struct
> drm_atomic_state *state)
>  			drm_crtc_vblank_get(&malidp->crtc);
> 
>  		/* only set config_valid if the CRTC is enabled */
> -		if (malidp_set_and_wait_config_valid(drm) < 0)
> +		if (malidp_set_and_wait_config_valid(drm) < 0) {
> +			/*
> +			 * make a loop around the second CVAL setting and
> +			 * try 5 times before giving up.
> +			 */
> +			while (loop--) {
> +				if (!malidp_set_and_wait_config_valid(drm))
> +					break;
> +			}
>  			DRM_DEBUG_DRIVER("timed out waiting for updated
> configuration\n");
> +		}
> +
>  	} else if (malidp->event) {
>  		/* CRTC inactive means vblank IRQ is disabled, send event directly */
>  		spin_lock_irq(&drm->event_lock);
> --
> 2.17.1