Re: [PATCH v4 00/13] Add ITE IT6263 LVDS to HDMI converter support

[Liu Ying <victor.liu@nxp.com>]

On 10/28/2024, Dmitry Baryshkov wrote:
> On Mon, Oct 28, 2024 at 11:12:00AM +0000, Biju Das wrote:
>> Hi Dmitry, Liu,
>>
>>> -----Original Message-----
>>> From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>>> Sent: 28 October 2024 10:20
>>> Subject: Re: [PATCH v4 00/13] Add ITE IT6263 LVDS to HDMI converter support
>>>
>>> Hi,
>>>
>>> On Mon, 28 Oct 2024 at 04:37, Liu Ying <victor.liu@nxp.com> wrote:
>>>>
>>>> Hi,
>>>>
>>>> This patch series aims to add ITE IT6263 LVDS to HDMI converter on
>>>> i.MX8MP EVK.  Combined with LVDS receiver and HDMI 1.4a transmitter,
>>>> the IT6263 supports LVDS input and HDMI 1.4 output by conversion
>>>> function.  IT6263 product link can be found at [1].
>>>>
>>>> Patch 1 is a preparation patch to allow display mode of an existing
>>>> panel to pass the added mode validation logic in patch 3.
>>>>
>>>> Patch 2 allows i.MX8MP LVDS Display Bridge(LDB) bridge driver to find
>>>> the next non-panel bridge, that is the IT6263 in this case.
>>>>
>>>> Patch 3 adds mode validation logic to i.MX8MP LDB bridge driver
>>>> against "ldb" clock so that it can filter out unsupported display
>>>> modes read from EDID.
>>>>
>>>> Patch 4 adds MEDIA_BUS_FMT_RGB101010_1X7X5_{SPWG,JEIDA} support, as
>>>> they are supported by IT6263(with LVDS data bit reversed order).
>>>>
>>>> Patch 5 makes drm_of.c use MEDIA_BUS_FMT_RGB101010_1X7X5_{JEIDA,SPWG}.
>>>>
>>>> Patch 6 supports getting dual-link LVDS pixel order for the sink side
>>>> as needed by IT6263 driver.
>>>>
>>>> Patch 7 documents jeida-30 and vesa-30 data mappings in
>>>> lvds-data-mapping.yaml, as needed by IT6263 DT binding.
>>>>
>>>> Patch 8 extracts common dual-link LVDS display properties into new
>>>> lvds-dual-ports.yaml so that IT6263 DT binding can reference it.
>>>>
>>>> Patch 9 adds DT binding for IT6263.
>>>>
>>>> Patch 10 adds IT6263 bridge driver.  Only video output is supported.
>>>>
>>>> Patch 11 adds DT overlays to support NXP adapter cards[2][3] with
>>>> IT6263 populated.
>>>>
>>>> Patch 12 enables the IT6263 bridge driver in defconfig.
>>>>
>>>> Patch 13 updates MAINTAINERS to add maintainer for IT6263 driver.
>>>
>>> This has pretty complicated structure from the merging point of view.
>>>
>>> I propose we take patches 6, 8, 9 (without 30-bit formats, they can be dropped while applying), 11, 12
>>> (?) and 13 through drm-misc in one batch (once DT maintainers review the binding parts). This looks
>>> like a minimal set, having no extra dependencies.
>>
>>>
>>> The second set might be 4, 5 + new patch, re-adding 30-bit formats to
>>> IT6263 binding (no driver changes are necessary). This can go in separately, after an Ack from media
>>> maintainers.
>>>
>>> Of course both sets can go together if linux-media maintainers reacts quickly and ack merging media-
>>> formats patch through drm-misc tree.

I'm fine with merging the two sets through drm-misc tree as long
as linux-media and dri-devel maintainers accept this.  Up to them.

>>>
>>> The rest of the patches don't have such strong dependencies and go in once ready / reviewed.
>>>
>>> WDYT?
>>
>> I guess, 6,8,9(without 30-bit formats), 10, 12 and 13.
>>
>> 11 may have dependency on 1, 2 and 3 as it is SoC specific.
> 
> Yes, of course, 10, not 11.
> 
>> Then 4, 5 + new patch, re-adding 30-bit formats to IT6263 binding.

I think it would be good to directly support 30-bit formats in
IT6263 DT binding, not re-add them to it.  This way, we'll have one
version of the binding, not two.  So, a better first set would
contain patch 6, 7(one existing A-b from Krzysztof), 8, 9, 10, 12
and 13. 

-- 
Regards,
Liu Ying