From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ander Conselvan De Oliveira Subject: Re: [PATCH 6/8] drm/i915: Don't calculate a new clock in ILK+ code if it is already set Date: Mon, 14 Mar 2016 15:01:03 +0200 Message-ID: <1457960463.2711.14.camel@gmail.com> References: <1457945747-2161-1-git-send-email-ander.conselvan.de.oliveira@intel.com> <1457945747-2161-7-git-send-email-ander.conselvan.de.oliveira@intel.com> <56E6A5CA.7000506@linux.intel.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=-S/4G18TAsieSUAg3+/sE" Return-path: Received: from mail-pf0-x243.google.com (mail-pf0-x243.google.com [IPv6:2607:f8b0:400e:c00::243]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6A9DC6E0B9 for ; Mon, 14 Mar 2016 13:01:05 +0000 (UTC) Received: by mail-pf0-x243.google.com with SMTP id n5so7753904pfn.1 for ; Mon, 14 Mar 2016 06:01:05 -0700 (PDT) In-Reply-To: <56E6A5CA.7000506@linux.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Maarten Lankhorst , intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org --=-S/4G18TAsieSUAg3+/sE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit On Mon, 2016-03-14 at 12:51 +0100, Maarten Lankhorst wrote: > Op 14-03-16 om 09:55 schreef Ander Conselvan de Oliveira: > > Remove the clock calculation from ironlake_crtc_compute_clock() when the > > encoder compute_config() already set one. The value was just thrown away > > in that case. > > > > Signed-off-by: Ander Conselvan de Oliveira < > > ander.conselvan.de.oliveira@intel.com> > > > It was thrown away, but it could still reject based on the limits, which this > patch changes. > This might be made more clear in the commit message. Good point. To be honest, I didn't very this as carefully as I should have before sending and missed that detail. It turns out that change is safe. To verify I extracted the relevant code and run it with all possible port clocks we could have with either the sdvo or the dp encoder setting the clock. See the attached C file. I was too lazy to actually understand what the g4x_find_best_dpll() does. Anyway, I'll send another version with a note about this. 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