linux-kernel - Re: [PATCH v8 2/3] drm: bridge: Add support for Cadence MHDP DPI/DP bridge

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Date:   Wed, 26 Aug 2020 10:26:22 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Swapnil Jakhade <sjakhade@...ence.com>
CC:     <airlied@...ux.ie>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <a.hajda@...sung.com>, <narmstrong@...libre.com>,
        <jonas@...boo.se>, <jernej.skrabec@...l.net>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <mparab@...ence.com>,
        <yamonkar@...ence.com>, <jsarha@...com>, <nsekhar@...com>,
        <praneeth@...com>
Subject: Re: [PATCH v8 2/3] drm: bridge: Add support for Cadence MHDP DPI/DP
 bridge

Hi,

On 11/08/2020 05:36, Laurent Pinchart wrote:
>> +{
>> +	u32 max_bw, req_bw, bpp;
>> +
>> +	bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt);
>> +	req_bw = mode->clock * bpp / 8;
>> +	max_bw = lanes * rate;
> mode->clock is in kHz, while rate is expressed in 10kHz unit if I'm not
> mistaken.

Rate is in 10 kbps units. And 10 bits in DP gives you one byte (8b/10b encoding). So max_bw is in
kBps, the same as req_bw.

 Tomi

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