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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 B0F5F89D56; Fri, 5 Feb 2021 20:06:54 +0000 (UTC) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by gabe.freedesktop.org (Postfix) with ESMTPS id 427C789CD8; Fri, 5 Feb 2021 20:06:53 +0000 (UTC) IronPort-SDR: Et1tPtK2BF8Ehp37efrGd5QcWIUqcGycdtAQGxmhW4gyZ2v/6/q6aGSo/Xgz5w/ukkA9+xrNYk v1Ea+tmP+fxQ== X-IronPort-AV: E=McAfee;i="6000,8403,9886"; a="169157597" X-IronPort-AV: E=Sophos;i="5.81,156,1610438400"; d="scan'208";a="169157597" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Feb 2021 12:06:52 -0800 IronPort-SDR: YUqwod6rVkMrT1SrQXPfUocEPnx5mJ9IswPo0e13J/TdSBcuAVBXugrLB8C9PIbW+SgIRJPoZ7 6nMmw1dbwDQA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,156,1610438400"; d="scan'208";a="393996648" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.171]) by orsmga008.jf.intel.com with SMTP; 05 Feb 2021 12:06:49 -0800 Received: by stinkbox (sSMTP sendmail emulation); Fri, 05 Feb 2021 22:06:48 +0200 Date: Fri, 5 Feb 2021 22:06:48 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: "Navare, Manasi" Message-ID: References: <20210204064842.11595-1-ankit.k.nautiyal@intel.com> <20210204064842.11595-2-ankit.k.nautiyal@intel.com> <20210205200741.GA911@labuser-Z97X-UD5H> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210205200741.GA911@labuser-Z97X-UD5H> 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 Fri, Feb 05, 2021 at 12:07:41PM -0800, Navare, Manasi wrote: > On Fri, Feb 05, 2021 at 09:58:07PM +0200, Ville Syrj=E4l=E4 wrote: > > 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/dr= m/i915/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 i= ntel_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 > = > Yes checked the DP 1.4 spec and this is correct I didn't think this is in the DP spec, but rather some special extra spec which I do not have. > = > Reviewed-by: Manasi Navare > = > Manasi > = > > = > > > 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 -- = Ville Syrj=E4l=E4 Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx