From: "Christian König" <christian.koenig@amd.com> To: Boszormenyi Zoltan <zboszor@pr.hu>, <cpaul@redhat.com>, Alex Deucher <alexander.deucher@amd.com>, David Airlie <airlied@linux.ie>, <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org> Cc: Jerome Glisse <jglisse@redhat.com>, Benjamin Tissoires <benjamin.tissoires@redhat.com> Subject: Re: [PATCH v2] drm/radeon: Retry DDC probing on DVI on failure if we got an HPD interrupt Date: Fri, 4 Dec 2015 10:54:34 +0100 [thread overview] Message-ID: <566162DA.40107@amd.com> (raw) In-Reply-To: <56616029.1010007@pr.hu> On 04.12.2015 10:43, Boszormenyi Zoltan wrote: > 2015-12-04 09:53 keltezéssel, Christian König írta: >> On 04.12.2015 00:26, cpaul@redhat.com wrote: >>> From: Lyude <cpaul@redhat.com> >>> >>> HPD signals on DVI ports can be fired off before the pins required for >>> DDC probing actually make contact, due to the pins for HPD making >>> contact first. This results in a HPD signal being asserted but DDC >>> probing failing, resulting in hotplugging occasionally failing. >>> >>> This is somewhat rare on most cards (depending on what angle you plug >>> the DVI connector in), but on some cards it happens constantly. The >>> Radeon R5 on the machine used for testing this patch for instance, runs >>> into this issue just about every time I try to hotplug a DVI monitor and >>> as a result hotplugging almost never works. >>> >>> Rescheduling the hotplug work for a second when we run into an HPD >>> signal with a failing DDC probe usually gives enough time for the rest >>> of the connector's pins to make contact, and fixes this issue. >>> >>> Signed-off-by: Lyude <cpaul@redhat.com> >> I find a second a bit long, but if it works so what? >> >> Looks sane enough to me, patch is Reviewed-by: Christian König <christian.koenig@amd.com> > Does this patch help in case of the Radeon chip only has HDMI and DP outputs > exposed (Zotac ZBOXNANO-AQ01) but used with DVI or VGA monitors with > converter cables? We have some problems with such scenarios that sounds > eerily similar to this description. No, at least active converter cables are a completely different case. Regards, Christian. > > Inquiry-by: Zoltán Böszörményi <zboszor@pr.hu> > ;-) > > Thanks in advance. >
WARNING: multiple messages have this Message-ID (diff)
From: "Christian König" <christian.koenig@amd.com> To: Boszormenyi Zoltan <zboszor@pr.hu>, cpaul@redhat.com, Alex Deucher <alexander.deucher@amd.com>, David Airlie <airlied@linux.ie>, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Jerome Glisse <jglisse@redhat.com>, Benjamin Tissoires <benjamin.tissoires@redhat.com> Subject: Re: [PATCH v2] drm/radeon: Retry DDC probing on DVI on failure if we got an HPD interrupt Date: Fri, 4 Dec 2015 10:54:34 +0100 [thread overview] Message-ID: <566162DA.40107@amd.com> (raw) In-Reply-To: <56616029.1010007@pr.hu> On 04.12.2015 10:43, Boszormenyi Zoltan wrote: > 2015-12-04 09:53 keltezéssel, Christian König írta: >> On 04.12.2015 00:26, cpaul@redhat.com wrote: >>> From: Lyude <cpaul@redhat.com> >>> >>> HPD signals on DVI ports can be fired off before the pins required for >>> DDC probing actually make contact, due to the pins for HPD making >>> contact first. This results in a HPD signal being asserted but DDC >>> probing failing, resulting in hotplugging occasionally failing. >>> >>> This is somewhat rare on most cards (depending on what angle you plug >>> the DVI connector in), but on some cards it happens constantly. The >>> Radeon R5 on the machine used for testing this patch for instance, runs >>> into this issue just about every time I try to hotplug a DVI monitor and >>> as a result hotplugging almost never works. >>> >>> Rescheduling the hotplug work for a second when we run into an HPD >>> signal with a failing DDC probe usually gives enough time for the rest >>> of the connector's pins to make contact, and fixes this issue. >>> >>> Signed-off-by: Lyude <cpaul@redhat.com> >> I find a second a bit long, but if it works so what? >> >> Looks sane enough to me, patch is Reviewed-by: Christian König <christian.koenig@amd.com> > Does this patch help in case of the Radeon chip only has HDMI and DP outputs > exposed (Zotac ZBOXNANO-AQ01) but used with DVI or VGA monitors with > converter cables? We have some problems with such scenarios that sounds > eerily similar to this description. No, at least active converter cables are a completely different case. Regards, Christian. > > Inquiry-by: Zoltán Böszörményi <zboszor@pr.hu> > ;-) > > Thanks in advance. > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2015-12-04 9:54 UTC|newest] Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-11-20 15:52 [PATCH] drm/radeon: Retry DDC probing on DVI on failure if we got an HPD interrupt cpaul 2015-11-21 14:22 ` Christian König 2015-11-21 14:22 ` Christian König 2015-11-21 14:49 ` Daniel Stone 2015-11-21 14:49 ` Daniel Stone 2015-11-21 15:22 ` Christian König 2015-11-21 15:22 ` Christian König 2015-11-23 2:44 ` Lyude 2015-11-23 2:44 ` Lyude 2015-11-23 14:20 ` Deucher, Alexander 2015-11-23 14:20 ` Deucher, Alexander 2015-11-23 15:43 ` Lyude 2015-11-23 15:43 ` Lyude 2015-11-23 17:48 ` Lyude 2015-11-23 17:48 ` Lyude 2015-11-30 15:36 ` Lyude 2015-11-30 15:36 ` Lyude 2015-12-03 23:26 ` [PATCH v2] " cpaul 2015-12-04 8:53 ` Christian König 2015-12-04 8:53 ` Christian König 2015-12-04 9:43 ` Boszormenyi Zoltan 2015-12-04 9:43 ` Boszormenyi Zoltan 2015-12-04 9:54 ` Christian König [this message] 2015-12-04 9:54 ` Christian König 2015-12-04 18:09 ` Alex Deucher 2015-12-04 18:09 ` Alex Deucher 2015-11-23 8:56 ` [PATCH] " Daniel Vetter 2015-11-23 8:55 ` Daniel Vetter 2015-11-23 8:55 ` Daniel Vetter 2015-12-03 14:58 ` Boszormenyi Zoltan 2015-12-03 14:58 ` Boszormenyi Zoltan
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