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 X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27D1EC33CB1 for ; Tue, 14 Jan 2020 14:55:48 +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 03059206D5 for ; Tue, 14 Jan 2020 14:55:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 03059206D5 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=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 60C3C6E3FE; Tue, 14 Jan 2020 14:55:47 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 68FE26E3FE; Tue, 14 Jan 2020 14:55:46 +0000 (UTC) X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Jan 2020 06:55:45 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,433,1571727600"; d="scan'208";a="242495126" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.174]) by orsmga002.jf.intel.com with SMTP; 14 Jan 2020 06:55:42 -0800 Received: by stinkbox (sSMTP sendmail emulation); Tue, 14 Jan 2020 16:55:41 +0200 Date: Tue, 14 Jan 2020 16:55:41 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Jani Nikula Subject: Re: [PATCH v3] drm/i915: Re-init lspcon after HPD if lspcon probe failed Message-ID: <20200114145541.GW13686@intel.com> References: <20191224084251.28414-1-kai.heng.feng@canonical.com> <85235F00-7FBA-46E4-B7A5-45294DE1B824@canonical.com> <87ftgiku03.fsf@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87ftgiku03.fsf@intel.com> X-Patchwork-Hint: comment User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: airlied@linux.ie, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, swati2.sharma@intel.com, Kai-Heng Feng , dri-devel@lists.freedesktop.org, rodrigo.vivi@intel.com Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Tue, Jan 14, 2020 at 04:11:40PM +0200, Jani Nikula wrote: > On Mon, 06 Jan 2020, Kai-Heng Feng wrote: > > Hi Jani, > > > >> On Dec 24, 2019, at 16:42, Kai-Heng Feng = wrote: > >> = > >> On HP 800 G4 DM, if HDMI cable isn't plugged before boot, the HDMI port > >> becomes useless and never responds to cable hotplugging: > >> [ 3.031904] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon > >> [ 3.031945] [drm:intel_ddi_init [i915]] *ERROR* LSPCON init failed = on port D > >> = > >> Seems like the lspcon chip on the system in question only gets powered > >> after the cable is plugged. > >> = > >> So let's call lspcon_init() dynamically to properly initialize the > >> lspcon chip and make HDMI port work. > > > > Do you have any further suggestion for this patch? > = > Sorry for taking so long. Comments inline. > = > > > > Kai-Heng > > > >> = > >> Closes: https://gitlab.freedesktop.org/drm/intel/issues/203 > >> Signed-off-by: Kai-Heng Feng > >> --- > >> v3: > >> - Make sure it's handled under long HPD case. > >> = > >> v2: = > >> - Move lspcon_init() inside of intel_dp_hpd_pulse(). > >> = > >> drivers/gpu/drm/i915/display/intel_dp.c | 8 +++++++- > >> 1 file changed, 7 insertions(+), 1 deletion(-) > >> = > >> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm= /i915/display/intel_dp.c > >> index fe31bbfd6c62..a72c9c041c60 100644 > >> --- a/drivers/gpu/drm/i915/display/intel_dp.c > >> +++ b/drivers/gpu/drm/i915/display/intel_dp.c > >> @@ -6573,6 +6573,7 @@ enum irqreturn > >> intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool lon= g_hpd) > >> { > >> struct intel_dp *intel_dp =3D &intel_dig_port->dp; > >> + struct drm_i915_private *dev_priv =3D dp_to_i915(intel_dp); > >> = > >> if (long_hpd && intel_dig_port->base.type =3D=3D INTEL_OUTPUT_EDP) { > >> /* > >> @@ -6593,7 +6594,12 @@ intel_dp_hpd_pulse(struct intel_digital_port *i= ntel_dig_port, bool long_hpd) > >> long_hpd ? "long" : "short"); > >> = > >> if (long_hpd) { > >> - intel_dp->reset_link_params =3D true; > >> + if (intel_dig_port->base.type =3D=3D INTEL_OUTPUT_DDI && > >> + HAS_LSPCON(dev_priv) && !intel_dig_port->lspcon.active) > >> + lspcon_init(intel_dig_port); > >> + else > >> + intel_dp->reset_link_params =3D true; > >> + > = > Hmm, I think this will try to init lspcon on ports that do not have > lspcon. Also, why wouldn't we reset the params? > = > I think this boils down to just adding the following lines: > = > if (intel_bios_is_lspcon_present(dev_priv, intel_dig_port->base.port) && > !intel_dig_port->lspcon.active) > lspcon_init(intel_dig_port); > = > = > Ville? This won't work right. Eg. intel_infoframe_init() assumes that lspcon init happens during driver load. We should probably change that to just trust the VBT and simply move the lspcon probe (if we even need one) into dp_detect() instead of sprinkling it around in several places. -- = Ville Syrj=E4l=E4 Intel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel