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=unavailable 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 979EFC33CA2 for ; Thu, 9 Jan 2020 15:27:05 +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 76D8020721 for ; Thu, 9 Jan 2020 15:27:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76D8020721 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 5EB756E914; Thu, 9 Jan 2020 15:27:03 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 093EF6E914; Thu, 9 Jan 2020 15:27:00 +0000 (UTC) X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:27:00 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,414,1571727600"; d="scan'208";a="216331926" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.174]) by orsmga008.jf.intel.com with SMTP; 09 Jan 2020 07:26:57 -0800 Received: by stinkbox (sSMTP sendmail emulation); Thu, 09 Jan 2020 17:26:57 +0200 Date: Thu, 9 Jan 2020 17:26:57 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Mario Kleiner Subject: Re: [PATCH] drm/i915/dp: Add current maximum eDP link rate to sink_rate array. Message-ID: <20200109152656.GP1208@intel.com> References: <20200109150752.28098-1-mario.kleiner.de@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200109150752.28098-1-mario.kleiner.de@gmail.com> 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: mario.kleiner.de@gmail.de, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Daniel Vetter 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 Thu, Jan 09, 2020 at 04:07:52PM +0100, Mario Kleiner wrote: > If the current eDP link rate, as read from hw, provides a > higher bandwidth than the standard link rates, then add the > current link rate to the link_rates array for consideration > in future mode-sets. > = > These initial current eDP link settings have been set up by > firmware during boot, so they should work on the eDP panel. > Therefore use them if the firmware thinks they are good and > they provide higher link bandwidth, e.g., to enable higher > resolutions / color depths. > = > This fixes a problem found on the MacBookPro 2017 Retina panel: > = > The panel reports 10 bpc color depth in its EDID, and the UEFI > firmware chooses link settings at boot which support enough > bandwidth for 10 bpc (324000 kbit/sec to be precise), but the > DP_MAX_LINK_RATE dpcd register only reports 2.7 Gbps as possible, > so intel_dp_set_sink_rates() would cap at that. This restricts > achievable color depth to 8 bpc, not providing the full color > depth of the panel. With this commit, we can use firmware setting > and get the full 10 bpc advertised by the Retina panel. > = > Signed-off-by: Mario Kleiner > Cc: Daniel Vetter > --- > drivers/gpu/drm/i915/display/intel_dp.c | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > = > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i9= 15/display/intel_dp.c > index 2f31d226c6eb..aa3e0b5108c6 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -4368,6 +4368,8 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp) > { > struct drm_i915_private *dev_priv =3D > to_i915(dp_to_dig_port(intel_dp)->base.base.dev); > + int max_rate; > + u8 link_bw; > = > /* this function is meant to be called only once */ > WARN_ON(intel_dp->dpcd[DP_DPCD_REV] !=3D 0); > @@ -4433,6 +4435,27 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp) > else > intel_dp_set_sink_rates(intel_dp); > = > + /* > + * If the firmware programmed a rate higher than the standard sink rates > + * during boot, then add that rate as a valid sink rate, as fw knows > + * this is a good rate and we get extra bandwidth. > + * > + * Helps, e.g., on the Apple MacBookPro 2017 Retina panel, which is only > + * eDP 1.1, but supports the unusual rate of 324000 kHz at bootup, for > + * 10 bpc / 30 bit color depth. > + */ > + if (!intel_dp->use_rate_select && > + (drm_dp_dpcd_read(&intel_dp->aux, DP_LINK_BW_SET, &link_bw, 1) =3D= =3D 1) && > + (link_bw > 0) && (intel_dp->num_sink_rates < DP_MAX_SUPPORTED_RATES= )) { > + max_rate =3D drm_dp_bw_code_to_link_rate(link_bw); > + if (max_rate > intel_dp->sink_rates[intel_dp->num_sink_rates - 1]) { > + intel_dp->sink_rates[intel_dp->num_sink_rates] =3D max_rate; > + intel_dp->num_sink_rates++; > + DRM_DEBUG_KMS("Adding max bandwidth eDP rate %d kHz.\n", > + max_rate); > + } Hmm. I guess we could do this. But plese put it into a separate function so we don't end up with that super ugly if condition. The debug message should probably be a bit more explicit. Eg. = something like: = "Firmware using non-standard link rate %d kHz. Including it in sink rates.\= n" I'm also wondering if we shouldn't just add the link rate to the sink rates regradless of whether it's the highest rate or not... > + } > + > intel_dp_set_common_rates(intel_dp); > = > /* Read the eDP DSC DPCD registers */ > -- = > 2.24.0 > = > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- = Ville Syrj=E4l=E4 Intel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel 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 2D659C282DD for ; Thu, 9 Jan 2020 15:27:04 +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 0AA6D20721 for ; Thu, 9 Jan 2020 15:27:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0AA6D20721 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=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 72A836E916; Thu, 9 Jan 2020 15:27:03 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 093EF6E914; Thu, 9 Jan 2020 15:27:00 +0000 (UTC) X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:27:00 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,414,1571727600"; d="scan'208";a="216331926" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.174]) by orsmga008.jf.intel.com with SMTP; 09 Jan 2020 07:26:57 -0800 Received: by stinkbox (sSMTP sendmail emulation); Thu, 09 Jan 2020 17:26:57 +0200 Date: Thu, 9 Jan 2020 17:26:57 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Mario Kleiner Message-ID: <20200109152656.GP1208@intel.com> References: <20200109150752.28098-1-mario.kleiner.de@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200109150752.28098-1-mario.kleiner.de@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) Subject: Re: [Intel-gfx] [PATCH] drm/i915/dp: Add current maximum eDP link rate to sink_rate array. 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: , Cc: mario.kleiner.de@gmail.de, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Daniel Vetter Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, Jan 09, 2020 at 04:07:52PM +0100, Mario Kleiner wrote: > If the current eDP link rate, as read from hw, provides a > higher bandwidth than the standard link rates, then add the > current link rate to the link_rates array for consideration > in future mode-sets. > = > These initial current eDP link settings have been set up by > firmware during boot, so they should work on the eDP panel. > Therefore use them if the firmware thinks they are good and > they provide higher link bandwidth, e.g., to enable higher > resolutions / color depths. > = > This fixes a problem found on the MacBookPro 2017 Retina panel: > = > The panel reports 10 bpc color depth in its EDID, and the UEFI > firmware chooses link settings at boot which support enough > bandwidth for 10 bpc (324000 kbit/sec to be precise), but the > DP_MAX_LINK_RATE dpcd register only reports 2.7 Gbps as possible, > so intel_dp_set_sink_rates() would cap at that. This restricts > achievable color depth to 8 bpc, not providing the full color > depth of the panel. With this commit, we can use firmware setting > and get the full 10 bpc advertised by the Retina panel. > = > Signed-off-by: Mario Kleiner > Cc: Daniel Vetter > --- > drivers/gpu/drm/i915/display/intel_dp.c | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > = > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i9= 15/display/intel_dp.c > index 2f31d226c6eb..aa3e0b5108c6 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -4368,6 +4368,8 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp) > { > struct drm_i915_private *dev_priv =3D > to_i915(dp_to_dig_port(intel_dp)->base.base.dev); > + int max_rate; > + u8 link_bw; > = > /* this function is meant to be called only once */ > WARN_ON(intel_dp->dpcd[DP_DPCD_REV] !=3D 0); > @@ -4433,6 +4435,27 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp) > else > intel_dp_set_sink_rates(intel_dp); > = > + /* > + * If the firmware programmed a rate higher than the standard sink rates > + * during boot, then add that rate as a valid sink rate, as fw knows > + * this is a good rate and we get extra bandwidth. > + * > + * Helps, e.g., on the Apple MacBookPro 2017 Retina panel, which is only > + * eDP 1.1, but supports the unusual rate of 324000 kHz at bootup, for > + * 10 bpc / 30 bit color depth. > + */ > + if (!intel_dp->use_rate_select && > + (drm_dp_dpcd_read(&intel_dp->aux, DP_LINK_BW_SET, &link_bw, 1) =3D= =3D 1) && > + (link_bw > 0) && (intel_dp->num_sink_rates < DP_MAX_SUPPORTED_RATES= )) { > + max_rate =3D drm_dp_bw_code_to_link_rate(link_bw); > + if (max_rate > intel_dp->sink_rates[intel_dp->num_sink_rates - 1]) { > + intel_dp->sink_rates[intel_dp->num_sink_rates] =3D max_rate; > + intel_dp->num_sink_rates++; > + DRM_DEBUG_KMS("Adding max bandwidth eDP rate %d kHz.\n", > + max_rate); > + } Hmm. I guess we could do this. But plese put it into a separate function so we don't end up with that super ugly if condition. The debug message should probably be a bit more explicit. Eg. = something like: = "Firmware using non-standard link rate %d kHz. Including it in sink rates.\= n" I'm also wondering if we shouldn't just add the link rate to the sink rates regradless of whether it's the highest rate or not... > + } > + > intel_dp_set_common_rates(intel_dp); > = > /* Read the eDP DSC DPCD registers */ > -- = > 2.24.0 > = > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- = Ville Syrj=E4l=E4 Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx