From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Swapnil Jakhade <sjakhade@cadence.com>
Cc: <airlied@linux.ie>, <daniel@ffwll.ch>, <robh+dt@kernel.org>,
<a.hajda@samsung.com>, <narmstrong@baylibre.com>,
<jonas@kwiboo.se>, <jernej.skrabec@siol.net>,
<dri-devel@lists.freedesktop.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <mparab@cadence.com>,
<yamonkar@cadence.com>, <jsarha@ti.com>, <nsekhar@ti.com>,
<praneeth@ti.com>
Subject: Re: [PATCH v8 2/3] drm: bridge: Add support for Cadence MHDP DPI/DP bridge
Date: Wed, 26 Aug 2020 10:26:22 +0300 [thread overview]
Message-ID: <0a6e7550-67ca-c72f-7c3a-1ed4586381a7@ti.com> (raw)
In-Reply-To: <20200811023622.GC13513@pendragon.ideasonboard.com>
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
--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
WARNING: multiple messages have this Message-ID (diff)
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Swapnil Jakhade <sjakhade@cadence.com>
Cc: devicetree@vger.kernel.org, jernej.skrabec@siol.net,
praneeth@ti.com, yamonkar@cadence.com, jonas@kwiboo.se,
airlied@linux.ie, narmstrong@baylibre.com, nsekhar@ti.com,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
a.hajda@samsung.com, robh+dt@kernel.org, jsarha@ti.com,
mparab@cadence.com
Subject: Re: [PATCH v8 2/3] drm: bridge: Add support for Cadence MHDP DPI/DP bridge
Date: Wed, 26 Aug 2020 10:26:22 +0300 [thread overview]
Message-ID: <0a6e7550-67ca-c72f-7c3a-1ed4586381a7@ti.com> (raw)
In-Reply-To: <20200811023622.GC13513@pendragon.ideasonboard.com>
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
--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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next prev parent reply other threads:[~2020-08-26 7:26 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-06 11:34 [PATCH v8 0/3] drm: Add support for Cadence MHDP DPI/DP bridge and J721E wrapper Swapnil Jakhade
2020-08-06 11:34 ` Swapnil Jakhade
2020-08-06 11:34 ` [PATCH v8 1/3] dt-bindings: drm/bridge: Document Cadence MHDP bridge bindings Swapnil Jakhade
2020-08-06 11:34 ` Swapnil Jakhade
2020-08-11 0:36 ` Laurent Pinchart
2020-08-11 0:36 ` Laurent Pinchart
2020-08-14 7:13 ` Tomi Valkeinen
2020-08-14 7:13 ` Tomi Valkeinen
2020-08-06 11:34 ` [PATCH v8 2/3] drm: bridge: Add support for Cadence MHDP DPI/DP bridge Swapnil Jakhade
2020-08-06 11:34 ` Swapnil Jakhade
2020-08-07 1:15 ` kernel test robot
2020-08-07 1:15 ` kernel test robot
2020-08-07 1:15 ` kernel test robot
2020-08-07 9:38 ` Tomi Valkeinen
2020-08-07 9:38 ` Tomi Valkeinen
2020-08-11 2:36 ` Laurent Pinchart
2020-08-11 2:36 ` Laurent Pinchart
2020-08-14 8:22 ` Tomi Valkeinen
2020-08-14 8:22 ` Tomi Valkeinen
2020-08-24 2:17 ` Laurent Pinchart
2020-08-24 2:17 ` Laurent Pinchart
2020-08-14 9:29 ` Tomi Valkeinen
2020-08-14 9:29 ` Tomi Valkeinen
2020-08-24 2:18 ` Laurent Pinchart
2020-08-24 2:18 ` Laurent Pinchart
2020-08-26 7:26 ` Tomi Valkeinen [this message]
2020-08-26 7:26 ` Tomi Valkeinen
2020-08-06 11:34 ` [PATCH v8 3/3] drm: bridge: cdns-mhdp: Add j721e wrapper Swapnil Jakhade
2020-08-06 11:34 ` Swapnil Jakhade
2020-08-11 2:41 ` Laurent Pinchart
2020-08-11 2:41 ` Laurent Pinchart
2020-08-12 8:39 ` [PATCH v8 0/3] drm: Add support for Cadence MHDP DPI/DP bridge and J721E wrapper Guido Günther
2020-08-12 8:39 ` Guido Günther
2020-08-12 10:47 ` Tomi Valkeinen
2020-08-12 10:47 ` Tomi Valkeinen
2020-08-12 13:56 ` Guido Günther
2020-08-12 13:56 ` Guido Günther
2020-08-24 7:16 ` Swapnil Kashinath Jakhade
2020-08-24 7:16 ` Swapnil Kashinath Jakhade
2020-08-25 7:32 ` Guido Günther
2020-08-25 7:32 ` Guido Günther
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