linux-kernel - RE: [PATCH v3 12/15] drm/bridge: Add ITE IT6263 LVDS to HDMI converter

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Message-ID:
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Date: Fri, 25 Oct 2024 08:57:13 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Liu Ying <victor.liu@....com>, "dri-devel@...ts.freedesktop.org"
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Subject: RE: [PATCH v3 12/15] drm/bridge: Add ITE IT6263 LVDS to HDMI
 converter

Hi Liu Ying,

> -----Original Message-----
> From: dri-devel <dri-devel-bounces@...ts.freedesktop.org> On Behalf Of Liu Ying
> Sent: 25 October 2024 09:25
> Subject: Re: [PATCH v3 12/15] drm/bridge: Add ITE IT6263 LVDS to HDMI converter
> 
> On 10/24/2024, Biju Das wrote:
> > Hi Liu Ying,
> 
> Hi Biju,
> 
> >
> >> -----Original Message-----
> >> From: Liu Ying <victor.liu@....com>
> >> Sent: Monday, October 21, 2024 7:45 AM
> >> Subject: [PATCH v3 12/15] drm/bridge: Add ITE IT6263 LVDS to HDMI
> >> converter
> >>
> >> Add basic HDMI video output support. Currently, only RGB888 output
> >> pixel format is supported.  At the LVDS input side, the driver
> >> supports single LVDS link and dual LVDS links with "jeida-24" LVDS mapping.
> >>
> >> Product link:
> >> https://www.ite.com.tw/en/product/cate1/IT6263
> >
> > Just a question,
> >
> > What is the maximum single link and dual link modes you have tested?
> 
> With single LVDS link on i.MX8MP EVK, the highest pixel clock rate I tested is 74.25MHz(1280x720@60).
> i.MX8MP LVDS Display Bridge(LDB) supports the highest 80MHz pixel clock rate with single LVDS link.
> 
> With single LVDS link on i.MX8qxp MEK, the highest pixel clock rate I tested is
> 148.5MHz(1920x1080@60).  i.MX8qxp LDB supports the highest 150MHz pixel clock rate with single LVDS
> link.
> 
> With dual LVDS links on both i.MX8MP EVK and i.MX8qxp MEK, the highest pixel clock rate I tested is
> 148.5MHz(1920x1080@60).


Thanks for the info.

> 
> >
> > On Renesas SMARC RZ/G3E platform I have tested with this patch set,
> >
> > Dual link :1080p@60
> >
> > and
> >
> > Single link:720p@60
> >
> > For single link > 720p@60, sometimes I get message
> > "it6263 7-004c: failed to wait for video stable"
> 
> I don't see this with i.MX8MP EVK and i.MX8qxp MEK.

OK. Maybe MEK supports upto 150MHz pixel clock rate on the SoC side.


> 
> >
> > From SoC side, it can support max dot clock of 87MHz for single link.
> >
> > So just wondering other than reject modes greater than 87MHz from SOC
> > side, do we need to limit any thing on bridge device for single link Case?
> 
> Since IT6263 works with 1920x1080@60(148.5MHz pixel clock rate) on i.MX8qxp MEK by using single LVDS
> link, I'm currently fine with the existing clock rate validation against the maximal 150MHz pixel
> clock rate.

I agree.

Cheers,
Biju