linux-kernel - Re: [PATCH] drm/stm: ltdc: use DRM_WARN for fifo & transfer error messages

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Date:   Mon, 1 Apr 2019 09:20:19 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Yannick FERTRE <yannick.fertre@...com>,
        Vincent ABRIOU <vincent.abriou@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre TORGUE" <alexandre.torgue@...com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/stm: ltdc: use DRM_WARN for fifo & transfer error
 messages

Dear Yannick,
Fully agree with this approach,

Acked-by: Philippe Cornu <philippe.cornu@...com>

Philippe :-)

On 3/29/19 4:49 PM, Yannick Fertré wrote:
> From: Philippe Cornu <philippe.cornu@...com>
> 
> Use DRM_WARN() instead of DRM_DEBUG_DRIVER() to better
> inform the user in case of fifo underruns or
> transfer errors.
> 
> Signed-off-by: Philippe Cornu <philippe.cornu@...com>
> ---
>   drivers/gpu/drm/stm/ltdc.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index b1741a9..15d8a02 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -822,11 +822,11 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
>   
>   	mutex_lock(&ldev->err_lock);
>   	if (ldev->error_status & ISR_FUIF) {
> -		DRM_DEBUG_DRIVER("Fifo underrun\n");
> +		DRM_WARN("ltdc fifo underrun: please verify display mode\n");
>   		ldev->error_status &= ~ISR_FUIF;
>   	}
>   	if (ldev->error_status & ISR_TERRIF) {
> -		DRM_DEBUG_DRIVER("Transfer error\n");
> +		DRM_WARN("ltdc transfer error\n");
>   		ldev->error_status &= ~ISR_TERRIF;
>   	}
>   	mutex_unlock(&ldev->err_lock);
>