From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A13AAC433F5 for ; Thu, 30 Sep 2021 16:21:55 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6FEB461139 for ; Thu, 30 Sep 2021 16:21:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6FEB461139 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B91B76EC06; Thu, 30 Sep 2021 16:21:54 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9CFAA6EC06 for ; Thu, 30 Sep 2021 16:21:53 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10123"; a="247768301" X-IronPort-AV: E=Sophos;i="5.85,336,1624345200"; d="scan'208";a="247768301" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Sep 2021 09:16:13 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.85,336,1624345200"; d="scan'208";a="564266842" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.171]) by fmsmga002.fm.intel.com with SMTP; 30 Sep 2021 09:16:11 -0700 Received: by stinkbox (sSMTP sendmail emulation); Thu, 30 Sep 2021 19:16:10 +0300 Date: Thu, 30 Sep 2021 19:16:10 +0300 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Imre Deak Cc: intel-gfx@lists.freedesktop.org Message-ID: References: <20210930134310.31669-1-ville.syrjala@linux.intel.com> <20210930134310.31669-3-ville.syrjala@linux.intel.com> <20210930160903.GE2418125@ideak-desk.fi.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20210930160903.GE2418125@ideak-desk.fi.intel.com> X-Patchwork-Hint: comment Subject: Re: [Intel-gfx] [PATCH 3/4] drm/i915: Remove DP_PORT_EN stuff from link training code X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, Sep 30, 2021 at 07:09:03PM +0300, Imre Deak wrote: > On Thu, Sep 30, 2021 at 04:43:09PM +0300, Ville Syrjala wrote: > > From: Ville Syrjälä > > > > Setting DP_PORT_EN in intel_dp->DP is already handled by > > intel_dp_enable_port() so there is no point in setting it also > > from the link training code. > > > > For DDI platforms a bit with that name doesn't even exist. The > > counterpart is DDI_BUF_CTL_ENABLE, which is already set up by > > intel_ddi_prepare_link_retrain(). Fortunately it is the same bit > > so there was no harm in doing this from the platform independent > > code as well. But it's just confusing when platform independent > > code sets platform specific bits in intel_dp->DP. Just get rid > > of it. > > > > Cc: Imre Deak > > Signed-off-by: Ville Syrjälä > > Reviewed-by: Imre Deak > > On pre-DDI platforms intel_dp_enable_port() may not be called before > short HPD/link-retraining, but the init/resume time HW readout will > set DP_PORT_EN for that case. I actually wonder what happens on DDI platforms. We don't do the resume readout there AFAICS, so if link retraining happens before any modesets are we just screwed atm? > > > --- > > drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 -- > > 1 file changed, 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c > > index 449499a5c4c1..053ed9302cda 100644 > > --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c > > +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c > > @@ -499,8 +499,6 @@ intel_dp_prepare_link_train(struct intel_dp *intel_dp, > > DP_SET_ANSI_128B132B : DP_SET_ANSI_8B10B; > > drm_dp_dpcd_write(&intel_dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2); > > > > - intel_dp->DP |= DP_PORT_EN; > > - > > return true; > > } > > > > -- > > 2.32.0 > > -- Ville Syrjälä Intel