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=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 B459EC433E0 for ; Tue, 30 Jun 2020 21:03:36 +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 8B4802074D for ; Tue, 30 Jun 2020 21:03:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8B4802074D 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 29A8E6E221; Tue, 30 Jun 2020 21:03:36 +0000 (UTC) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id A12EF8967F for ; Tue, 30 Jun 2020 21:03:34 +0000 (UTC) IronPort-SDR: +yscZRkMsCMomU4yFqEsXqqp8gwewYjLS3pKchM/YEbeDHnbNdODUEm1Qvo/P3/qNo6N0Yvz4h kQPX0vwEHphA== X-IronPort-AV: E=McAfee;i="6000,8403,9668"; a="207901804" X-IronPort-AV: E=Sophos;i="5.75,298,1589266800"; d="scan'208";a="207901804" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2020 14:03:33 -0700 IronPort-SDR: scRzwycX2VDRIR29dC+SOCtankTs7SM6M4PPKfcbpFhKxoteip//d8Qd+EBNOC3Sk3iBuX63SY s7MQM55C1TLw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,298,1589266800"; d="scan'208";a="281361214" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.174]) by orsmga006.jf.intel.com with SMTP; 30 Jun 2020 14:03:31 -0700 Received: by stinkbox (sSMTP sendmail emulation); Wed, 01 Jul 2020 00:03:30 +0300 Date: Wed, 1 Jul 2020 00:03:30 +0300 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Manasi Navare Message-ID: <20200630210330.GU6112@intel.com> References: <20200626232641.4557-1-manasi.d.navare@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200626232641.4557-1-manasi.d.navare@intel.com> X-Patchwork-Hint: comment User-Agent: Mutt/1.10.1 (2018-07-13) Subject: Re: [Intel-gfx] [PATCH v4 1/2] drm/i915/dp: Helper for checking DDI_BUF_CTL Idle status 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 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, Jun 26, 2020 at 04:26:40PM -0700, Manasi Navare wrote: > Modify the helper to add a fixed delay or poll with timeout > based on platform specification to check for either Idle bit > set (DDI_BUF_CTL is idle for disable case) > = > v3: > * Change the timeout to 16usecs (Ville) > v2: > * Use 2 separate functions or idle and active (Ville) > = > Cc: Ville Syrj=E4l=E4 > Cc: Imre Deak > Signed-off-by: Manasi Navare > --- > drivers/gpu/drm/i915/display/intel_ddi.c | 17 ++++++++--------- > 1 file changed, 8 insertions(+), 9 deletions(-) > = > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i= 915/display/intel_ddi.c > index 884b507c5f55..052a74625a61 100644 > --- a/drivers/gpu/drm/i915/display/intel_ddi.c > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c > @@ -1184,16 +1184,15 @@ static void intel_prepare_hdmi_ddi_buffers(struct= intel_encoder *encoder, > static void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv, > enum port port) > { > - i915_reg_t reg =3D DDI_BUF_CTL(port); > - int i; > - > - for (i =3D 0; i < 16; i++) { > - udelay(1); > - if (intel_de_read(dev_priv, reg) & DDI_BUF_IS_IDLE) > - return; > + if (IS_BROXTON(dev_priv)) { > + udelay(16); > + return; > } > - drm_err(&dev_priv->drm, "Timeout waiting for DDI BUF %c idle bit\n", > - port_name(port)); > + > + if (wait_for_us((intel_de_read(dev_priv, DDI_BUF_CTL(port)) & > + DDI_BUF_IS_IDLE), 16)) 16 is the BXT number. IIRC the spec said 8 usec for the other platforms. > + drm_err(&dev_priv->drm, "Timeout waiting for DDI BUF %c to get idle\n", > + port_name(port)); > } > = > static u32 hsw_pll_to_ddi_pll_sel(const struct intel_shared_dpll *pll) > -- = > 2.19.1 -- = Ville Syrj=E4l=E4 Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx