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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 32EC7C2BA83 for ; Wed, 12 Feb 2020 15:36:49 +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 0B9932073C for ; Wed, 12 Feb 2020 15:36:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0B9932073C 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 921B66E8BC; Wed, 12 Feb 2020 15:36:48 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id 596296E8BC for ; Wed, 12 Feb 2020 15:36:47 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Feb 2020 07:36:46 -0800 X-IronPort-AV: E=Sophos;i="5.70,433,1574150400"; d="scan'208";a="237737947" Received: from jnikula-mobl3.fi.intel.com (HELO localhost) ([10.237.66.161]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Feb 2020 07:36:44 -0800 From: Jani Nikula To: Stanislav Lisovskiy , intel-gfx@lists.freedesktop.org In-Reply-To: <20200212152525.23108-1-stanislav.lisovskiy@intel.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20200212152525.23108-1-stanislav.lisovskiy@intel.com> Date: Wed, 12 Feb 2020 17:36:40 +0200 Message-ID: <87o8u3yfzr.fsf@intel.com> MIME-Version: 1.0 Subject: Re: [Intel-gfx] [PATCH v1] drm/i915: Ensure no conflicts with BIOS when updating Dbuf 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Wed, 12 Feb 2020, Stanislav Lisovskiy wrote: > TGL BIOS seems to enable both DBuf slices ocasionally, depending > how many displays are connected, while i915 according to BSpec > was powering on S1 DBuf slice, until a modeset was done. > > This was causing a brief flash during the boot as we were > disabling slice, previously used by BIOS with that. > > To prevent this, now we are ensuring tht we are enabling > _at least_ one slice, but if there are more, let's not > power them off. > > Fixes: ff2cd8635e41 ("drm/i915: Correctly map DBUF slices to pipes") > Signed-off-by: Stanislav Lisovskiy > --- > drivers/gpu/drm/i915/display/intel_display_power.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c > index 53056def5414..b9a9cbad8a03 100644 > --- a/drivers/gpu/drm/i915/display/intel_display_power.c > +++ b/drivers/gpu/drm/i915/display/intel_display_power.c > @@ -4470,11 +4470,13 @@ void icl_dbuf_slices_update(struct drm_i915_private *dev_priv, > > static void icl_dbuf_enable(struct drm_i915_private *dev_priv) > { > + skl_ddb_get_hw_state(dev_priv); > /* > - * Just power up 1 slice, we will > + * Just power up at least 1 slice, we will > * figure out later which slices we have and what we need. > */ > - icl_dbuf_slices_update(dev_priv, BIT(DBUF_S1)); > + icl_dbuf_slices_update(dev_priv, dev_priv->enabled_dbuf_slices_mask | > + BIT(DBUF_S1)); I don't know anything about this, but it seems obvious to me the enabling code should not do hardware readout; they should be separated from a much higher level. BR, Jani. > } > > static void icl_dbuf_disable(struct drm_i915_private *dev_priv) -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx