linux-kernel - Re: [PATCH] drm/bridge: ite-it6263: Support VESA input format

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Message-ID: <3243b983-2f22-4254-b7e6-0f7ef0ae725c@nxp.com>
Date: Thu, 5 Dec 2024 17:02:07 +0800
From: Liu Ying <victor.liu@....com>
To: Biju Das <biju.das.jz@...renesas.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 "tomm.merciai@...il.com" <tomm.merciai@...il.com>
Cc: "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
 "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
 Tommaso Merciai <tommaso.merciai.xr@...renesas.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 "laurent.pinchart" <laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/bridge: ite-it6263: Support VESA input format

On 12/04/2024, Biju Das wrote:
> Hi Liu Ying,

Hi Biju,

> 
>> -----Original Message-----
>> From: Liu Ying <victor.liu@....com>
>> Sent: 04 December 2024 03:43
>> Subject: Re: [PATCH] drm/bridge: ite-it6263: Support VESA input format
>>
>> On 12/04/2024, Dmitry Baryshkov wrote:
>>> On Tue, Dec 03, 2024 at 06:21:29PM +0100, tomm.merciai@...il.com wrote:
>>>> From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
>>>>
>>>> Introduce it6263_is_input_bus_fmt_valid() and refactor the
>>>> it6263_bridge_atomic_get_input_bus_fmts() function to support VESA
>>>> format by selecting the LVDS input format based on the LVDS data
>>>> mapping and thereby support both JEIDA and VESA input formats.
>>>
>>> For the patch itself,
>>>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>>
>>> A more generic question: is the bridge limited to 4 lanes or does it
>>> support 3-lane or 5-lane configurations?
>>
>> According to ite,it6263.yaml, the bridge supports all the data mappings(jeida-{18,24,30} and vesa-
>> {24,30}) listed in lvds-data-mapping.yaml.  lvds-data-mapping.yaml specifies the data lanes(3/4/5)
>> used by each of the data mappings.  So, the bridge supports 3, 4 or 5 data lanes.
> 
> In Renesas SMARC RZ/G3E LVDS add on board, only 4 LVDS Rx lanes connected. The 5th one is unconnected.
> What is the situation in your board Liu Ying?

The adapter cards I'm using to connect with i.MX8MP EVK have only 4
LVDS data lanes routed out. 

> 
> Cheers,
> Biju

-- 
Regards,
Liu Ying