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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Ulrich Hecht <uli@fpond.eu>
Cc: Ulrich Hecht <uli+renesas@fpond.eu>,
	linux-renesas-soc@vger.kernel.org,
	dri-devel@lists.freedesktop.org, jacopo+renesas@jmondi.org,
	kieran.bingham+renesas@ideasonboard.com,
	Koji Matsuoka <koji.matsuoka.xm@renesas.com>
Subject: Re: [PROTO][PATCH 05/10] drm/bridge: adv7511: Add max-clock, min-vrefresh options
Date: Wed, 22 Aug 2018 17:00:26 +0300	[thread overview]
Message-ID: <1757500.XeSFtVI82s@avalon> (raw)
In-Reply-To: <1145018473.417930.1534929239255@webmail.strato.com>

Hi Ulrich,

On Wednesday, 22 August 2018 12:13:59 EEST Ulrich Hecht wrote:
> On August 21, 2018 at 10:09 AM Laurent Pinchart wrote:
> > On Tuesday, 21 August 2018 11:03:45 EEST Ulrich Hecht wrote:
> >> On August 20, 2018 at 11:28 AM Laurent Pinchart wrote:
> >>> On Tuesday, 14 August 2018 16:49:59 EEST Ulrich Hecht wrote:
> >>>> From: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
> >>>> 
> >>>> This patch adds the option to specify a maximal clock and a minimal
> >>>> vertical refresh rate.
> >>> 
> >>> What is this needed for ?
> >> 
> >> Somewhere in the chain there is a component that will not tolerate
> >> clocks in excess of 135 MHz; if you don't limit it, the default for a
> >> 1920x1200 display is somewhere along 148 MHz, and the HDMI signal
> >> output is invalid.
> > 
> > Do you know which component that is ?
> 
> Unfortunately not. It's not the ADV7511, though, that goes up to 225 MHz...

After investigation, it turns out that the THC63LVD1024 is the culprit, its 
datasheet reports a maximum operating frequency of 135 MHz.

Do you have any idea what the minimal refresh rate is for ?

-- 
Regards,

Laurent Pinchart

WARNING: multiple messages have this Message-ID (diff)
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Ulrich Hecht <uli@fpond.eu>
Cc: Koji Matsuoka <koji.matsuoka.xm@renesas.com>,
	dri-devel@lists.freedesktop.org,
	linux-renesas-soc@vger.kernel.org,
	kieran.bingham+renesas@ideasonboard.com,
	jacopo+renesas@jmondi.org, Ulrich Hecht <uli+renesas@fpond.eu>
Subject: Re: [PROTO][PATCH 05/10] drm/bridge: adv7511: Add max-clock, min-vrefresh options
Date: Wed, 22 Aug 2018 17:00:26 +0300	[thread overview]
Message-ID: <1757500.XeSFtVI82s@avalon> (raw)
In-Reply-To: <1145018473.417930.1534929239255@webmail.strato.com>

Hi Ulrich,

On Wednesday, 22 August 2018 12:13:59 EEST Ulrich Hecht wrote:
> On August 21, 2018 at 10:09 AM Laurent Pinchart wrote:
> > On Tuesday, 21 August 2018 11:03:45 EEST Ulrich Hecht wrote:
> >> On August 20, 2018 at 11:28 AM Laurent Pinchart wrote:
> >>> On Tuesday, 14 August 2018 16:49:59 EEST Ulrich Hecht wrote:
> >>>> From: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
> >>>> 
> >>>> This patch adds the option to specify a maximal clock and a minimal
> >>>> vertical refresh rate.
> >>> 
> >>> What is this needed for ?
> >> 
> >> Somewhere in the chain there is a component that will not tolerate
> >> clocks in excess of 135 MHz; if you don't limit it, the default for a
> >> 1920x1200 display is somewhere along 148 MHz, and the HDMI signal
> >> output is invalid.
> > 
> > Do you know which component that is ?
> 
> Unfortunately not. It's not the ADV7511, though, that goes up to 225 MHz...

After investigation, it turns out that the THC63LVD1024 is the culprit, its 
datasheet reports a maximum operating frequency of 135 MHz.

Do you have any idea what the minimal refresh rate is for ?

-- 
Regards,

Laurent Pinchart



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  reply	other threads:[~2018-08-22 17:24 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-14 13:49 [PROTO][PATCH 00/10] R-Car D3 LVDS/HDMI support (with PLL) Ulrich Hecht
2018-08-14 13:49 ` Ulrich Hecht
2018-08-14 13:49 ` [PROTO][PATCH 01/10] drm: rcar-du: Add clk_set_rate for external clock device Ulrich Hecht
2018-08-14 13:49   ` Ulrich Hecht
2018-08-20 10:10   ` Laurent Pinchart
2018-08-20 10:10     ` Laurent Pinchart
2018-08-14 13:49 ` [PROTO][PATCH 02/10] drm: rcar-du: Add r8a77995 device support Ulrich Hecht
2018-08-14 13:49   ` Ulrich Hecht
2018-08-20  8:39   ` Laurent Pinchart
2018-08-20  8:39     ` Laurent Pinchart
2018-08-14 13:49 ` [PROTO][PATCH 03/10] drm: rcar-du: Fix digital RGB routing for R8A77995 Ulrich Hecht
2018-08-14 13:49   ` Ulrich Hecht
2018-08-20  9:25   ` Laurent Pinchart
2018-08-20  9:25     ` Laurent Pinchart
2018-08-14 13:49 ` [PROTO][PATCH 04/10] drm: rcar-du: lvds: LVDS PLL support Ulrich Hecht
2018-08-14 13:49   ` Ulrich Hecht
2018-08-20 10:48   ` Laurent Pinchart
2018-08-20 10:48     ` Laurent Pinchart
2018-08-14 13:49 ` [PROTO][PATCH 05/10] drm/bridge: adv7511: Add max-clock, min-vrefresh options Ulrich Hecht
2018-08-14 13:49   ` Ulrich Hecht
2018-08-20  9:28   ` Laurent Pinchart
2018-08-20  9:28     ` Laurent Pinchart
2018-08-21  8:03     ` Ulrich Hecht
2018-08-21  8:03       ` Ulrich Hecht
2018-08-21  8:09       ` Laurent Pinchart
2018-08-21  8:09         ` Laurent Pinchart
2018-08-22  9:13         ` Ulrich Hecht
2018-08-22  9:13           ` Ulrich Hecht
2018-08-22 14:00           ` Laurent Pinchart [this message]
2018-08-22 14:00             ` Laurent Pinchart
2018-08-14 13:50 ` [PROTO][PATCH 06/10] drm: rcar-du: Fix procedure for extal and dotclkin selection Ulrich Hecht
2018-08-14 13:50   ` Ulrich Hecht
2018-08-20  9:40   ` Laurent Pinchart
2018-08-20  9:40     ` Laurent Pinchart
2018-08-14 13:50 ` [PROTO][PATCH 07/10] arm64: dts: r8a77995-draak: set external clock for DU Ulrich Hecht
2018-08-14 13:50   ` Ulrich Hecht
2018-08-20 10:51   ` Laurent Pinchart
2018-08-20 10:51     ` Laurent Pinchart
2018-08-14 13:50 ` [PROTO][PATCH 08/10] drm: rcar-du: lvds: Handle LVDS interface reset Ulrich Hecht
2018-08-14 13:50   ` Ulrich Hecht
2018-08-14 13:50 ` [PROTO][PATCH 09/10] arm64: dts: renesas: r8a77995: Add LVDS support Ulrich Hecht
2018-08-14 13:50   ` Ulrich Hecht
2018-08-14 13:50 ` [PROTO][PATCH 10/10] arm64: dts: renesas: r8a77995-draak: add HDMI output Ulrich Hecht
2018-08-14 13:50   ` Ulrich Hecht
2018-08-20 11:01   ` Laurent Pinchart
2018-08-20 11:01     ` Laurent Pinchart
2018-08-20  9:50 ` [PROTO][PATCH 00/10] R-Car D3 LVDS/HDMI support (with PLL) Laurent Pinchart
2018-08-20  9:50   ` Laurent Pinchart
2018-08-21  8:02   ` Ulrich Hecht
2018-08-21  8:02     ` Ulrich Hecht

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