From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from perceval.ideasonboard.com ([213.167.242.64]:44790 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728444AbeHVRYb (ORCPT ); Wed, 22 Aug 2018 13:24:31 -0400 From: Laurent Pinchart To: Ulrich Hecht Cc: Ulrich Hecht , linux-renesas-soc@vger.kernel.org, dri-devel@lists.freedesktop.org, jacopo+renesas@jmondi.org, kieran.bingham+renesas@ideasonboard.com, Koji Matsuoka Subject: Re: [PROTO][PATCH 05/10] drm/bridge: adv7511: Add max-clock, min-vrefresh options Date: Wed, 22 Aug 2018 17:00:26 +0300 Message-ID: <1757500.XeSFtVI82s@avalon> In-Reply-To: <1145018473.417930.1534929239255@webmail.strato.com> References: <1534254604-24204-1-git-send-email-uli+renesas@fpond.eu> <4491168.zjQBQaeJMW@avalon> <1145018473.417930.1534929239255@webmail.strato.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-renesas-soc-owner@vger.kernel.org List-ID: 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 > >>>> > >>>> 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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Subject: Re: [PROTO][PATCH 05/10] drm/bridge: adv7511: Add max-clock, min-vrefresh options Date: Wed, 22 Aug 2018 17:00:26 +0300 Message-ID: <1757500.XeSFtVI82s@avalon> References: <1534254604-24204-1-git-send-email-uli+renesas@fpond.eu> <4491168.zjQBQaeJMW@avalon> <1145018473.417930.1534929239255@webmail.strato.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9599E89D99 for ; Wed, 22 Aug 2018 13:59:29 +0000 (UTC) In-Reply-To: <1145018473.417930.1534929239255@webmail.strato.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Ulrich Hecht Cc: Koji Matsuoka , dri-devel@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org, kieran.bingham+renesas@ideasonboard.com, jacopo+renesas@jmondi.org, Ulrich Hecht List-Id: dri-devel@lists.freedesktop.org SGkgVWxyaWNoLAoKT24gV2VkbmVzZGF5LCAyMiBBdWd1c3QgMjAxOCAxMjoxMzo1OSBFRVNUIFVs cmljaCBIZWNodCB3cm90ZToKPiBPbiBBdWd1c3QgMjEsIDIwMTggYXQgMTA6MDkgQU0gTGF1cmVu dCBQaW5jaGFydCB3cm90ZToKPiA+IE9uIFR1ZXNkYXksIDIxIEF1Z3VzdCAyMDE4IDExOjAzOjQ1 IEVFU1QgVWxyaWNoIEhlY2h0IHdyb3RlOgo+ID4+IE9uIEF1Z3VzdCAyMCwgMjAxOCBhdCAxMToy OCBBTSBMYXVyZW50IFBpbmNoYXJ0IHdyb3RlOgo+ID4+PiBPbiBUdWVzZGF5LCAxNCBBdWd1c3Qg MjAxOCAxNjo0OTo1OSBFRVNUIFVscmljaCBIZWNodCB3cm90ZToKPiA+Pj4+IEZyb206IEtvamkg TWF0c3Vva2EgPGtvamkubWF0c3Vva2EueG1AcmVuZXNhcy5jb20+Cj4gPj4+PiAKPiA+Pj4+IFRo aXMgcGF0Y2ggYWRkcyB0aGUgb3B0aW9uIHRvIHNwZWNpZnkgYSBtYXhpbWFsIGNsb2NrIGFuZCBh IG1pbmltYWwKPiA+Pj4+IHZlcnRpY2FsIHJlZnJlc2ggcmF0ZS4KPiA+Pj4gCj4gPj4+IFdoYXQg aXMgdGhpcyBuZWVkZWQgZm9yID8KPiA+PiAKPiA+PiBTb21ld2hlcmUgaW4gdGhlIGNoYWluIHRo ZXJlIGlzIGEgY29tcG9uZW50IHRoYXQgd2lsbCBub3QgdG9sZXJhdGUKPiA+PiBjbG9ja3MgaW4g ZXhjZXNzIG9mIDEzNSBNSHo7IGlmIHlvdSBkb24ndCBsaW1pdCBpdCwgdGhlIGRlZmF1bHQgZm9y IGEKPiA+PiAxOTIweDEyMDAgZGlzcGxheSBpcyBzb21ld2hlcmUgYWxvbmcgMTQ4IE1IeiwgYW5k IHRoZSBIRE1JIHNpZ25hbAo+ID4+IG91dHB1dCBpcyBpbnZhbGlkLgo+ID4gCj4gPiBEbyB5b3Ug a25vdyB3aGljaCBjb21wb25lbnQgdGhhdCBpcyA/Cj4gCj4gVW5mb3J0dW5hdGVseSBub3QuIEl0 J3Mgbm90IHRoZSBBRFY3NTExLCB0aG91Z2gsIHRoYXQgZ29lcyB1cCB0byAyMjUgTUh6Li4uCgpB ZnRlciBpbnZlc3RpZ2F0aW9uLCBpdCB0dXJucyBvdXQgdGhhdCB0aGUgVEhDNjNMVkQxMDI0IGlz IHRoZSBjdWxwcml0LCBpdHMgCmRhdGFzaGVldCByZXBvcnRzIGEgbWF4aW11bSBvcGVyYXRpbmcg ZnJlcXVlbmN5IG9mIDEzNSBNSHouCgpEbyB5b3UgaGF2ZSBhbnkgaWRlYSB3aGF0IHRoZSBtaW5p bWFsIHJlZnJlc2ggcmF0ZSBpcyBmb3IgPwoKLS0gClJlZ2FyZHMsCgpMYXVyZW50IFBpbmNoYXJ0 CgoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1k ZXZlbCBtYWlsaW5nIGxpc3QKZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczov L2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbAo=