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=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 D051AC433E0 for ; Fri, 5 Feb 2021 19:58:13 +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 4868F64E51 for ; Fri, 5 Feb 2021 19:58:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4868F64E51 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 79AF26F4BC; Fri, 5 Feb 2021 19:58:12 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 909616F4B9; Fri, 5 Feb 2021 19:58:11 +0000 (UTC) IronPort-SDR: CT6N2BXescKcdDraNmnhm8Ii/GO+pylaSCkM0GWFV6AuAM5H91Rbdepf6A1MOUlwVdDV5dbQVR w1X9MBHEBhBg== X-IronPort-AV: E=McAfee;i="6000,8403,9886"; a="181629670" X-IronPort-AV: E=Sophos;i="5.81,156,1610438400"; d="scan'208";a="181629670" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Feb 2021 11:58:10 -0800 IronPort-SDR: 6L1m6RRRblriemzMc8Yehw5J4z1haPsP3KhdiMCYP+J5yXWe1P7IqFi+6K4Y2WiGI+7esiyFYc ErUqgKgDB0Mg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,156,1610438400"; d="scan'208";a="373653771" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.171]) by fmsmga008.fm.intel.com with SMTP; 05 Feb 2021 11:58:07 -0800 Received: by stinkbox (sSMTP sendmail emulation); Fri, 05 Feb 2021 21:58:07 +0200 Date: Fri, 5 Feb 2021 21:58:07 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Ankit Nautiyal Message-ID: References: <20210204064842.11595-1-ankit.k.nautiyal@intel.com> <20210204064842.11595-2-ankit.k.nautiyal@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210204064842.11595-2-ankit.k.nautiyal@intel.com> X-Patchwork-Hint: comment Subject: Re: [Intel-gfx] [PATCH 1/3] i915/display/intel_dp: Read PCON DSC ENC caps only for DPCD rev >= 1.4 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: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org 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, Feb 04, 2021 at 12:18:40PM +0530, Ankit Nautiyal wrote: > DP-HDMI2.1 PCON has DSC encoder caps defined in registers 0x92-0x9E. > Do not read the registers if DPCD rev < 1.4. > = > Fixes: https://gitlab.freedesktop.org/drm/intel/-/issues/2868 > Signed-off-by: Ankit Nautiyal > --- > drivers/gpu/drm/i915/display/intel_dp.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > = > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i9= 15/display/intel_dp.c > index 8c12d5375607..2b83f0f433a2 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -2489,9 +2489,11 @@ static void intel_dp_get_pcon_dsc_cap(struct intel= _dp *intel_dp) > struct drm_i915_private *i915 =3D dp_to_i915(intel_dp); > = > /* Clear the cached register set to avoid using stale values */ > - > memset(intel_dp->pcon_dsc_dpcd, 0, sizeof(intel_dp->pcon_dsc_dpcd)); > = > + if (intel_dp->dpcd[DP_DPCD_REV] < 0x14) > + return; > + Can't check the spec, but makes sense that this stuff is only valid for recent DCPD revisions. Acked-by: Ville Syrj=E4l=E4 > if (drm_dp_dpcd_read(&intel_dp->aux, DP_PCON_DSC_ENCODER, > intel_dp->pcon_dsc_dpcd, > sizeof(intel_dp->pcon_dsc_dpcd)) < 0) > -- = > 2.29.2 -- = Ville Syrj=E4l=E4 Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx