linux-kernel - Re: [PATCH] drm/komeda: Adds more check in mode

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Message-ID: <13323280.1D6Sk5SDY4@e123338-lin.cambridge.arm.com>
Date:   Thu, 3 Oct 2019 17:05:40 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     "Lowry Li (Arm Technology China)" <Lowry.Li@....com>
CC:     Liviu Dudau <Liviu.Dudau@....com>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        nd <nd@....com>
Subject: Re: [PATCH] drm/komeda: Adds more check in mode_valid

On Friday, 26 July 2019 09:06:16 BST Lowry Li (Arm Technology China) wrote:
> This patch adds the checks for vrefresh, crtc_hdisplay and crtc_vdisplay.
> 
> Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@....com>
> ---
>  drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 28 +++++++++++++++++++++++-
>  1 file changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> index 2fed1f6..017f6b6 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> @@ -403,11 +403,37 @@ unsigned long komeda_crtc_get_aclk(struct komeda_crtc_state *kcrtc_st)
>  	struct komeda_dev *mdev = crtc->dev->dev_private;
>  	struct komeda_crtc *kcrtc = to_kcrtc(crtc);
>  	struct komeda_pipeline *master = kcrtc->master;
> -	unsigned long min_pxlclk, min_aclk;
> +	struct komeda_compiz *compiz = master->compiz;
> +	unsigned long min_pxlclk, min_aclk, delta, full_frame;
> +	int hdisplay = m->hdisplay;
>  
>  	if (m->flags & DRM_MODE_FLAG_INTERLACE)
>  		return MODE_NO_INTERLACE;
>  
> +	full_frame = m->htotal * m->vtotal;
> +	delta = abs(m->clock * 1000 - m->vrefresh * full_frame);
> +	if (m->vrefresh && (delta > full_frame)) {
> +		DRM_DEBUG_ATOMIC("mode clock check error!\n");
> +		return MODE_CLOCK_RANGE;
> +	}
> +
> +	if (kcrtc->side_by_side)
> +		hdisplay /= 2;
> +
> +	if (!in_range(&compiz->hsize, hdisplay)) {
> +		DRM_DEBUG_ATOMIC("hdisplay[%u] is out of range[%u, %u]!\n",
> +				 hdisplay, compiz->hsize.start,
> +				 compiz->hsize.end);
> +		return MODE_BAD_HVALUE;
> +	}
> +
> +	if (!in_range(&compiz->vsize, m->vdisplay)) {
> +		DRM_DEBUG_ATOMIC("vdisplay[%u] is out of range[%u, %u]!\n",
> +				 m->vdisplay, compiz->vsize.start,
> +				 compiz->vsize.end);
> +		return MODE_BAD_VVALUE;
> +	}
> +
>  	min_pxlclk = m->clock * 1000;
>  	if (master->dual_link)
>  		min_pxlclk /= 2;
> 
LGTM,

Reviewed-by: Mihail Atanassov <mihail.atanassov@....com>

-- 
Mihail