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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 7B9B7C48BCF for ; Wed, 9 Jun 2021 16:51:00 +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 3F9FC613CB for ; Wed, 9 Jun 2021 16:51:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3F9FC613CB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=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 A05276E07F; Wed, 9 Jun 2021 16:50:59 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id A6D3A6E07F for ; Wed, 9 Jun 2021 16:50:57 +0000 (UTC) IronPort-SDR: AtcFQ1wkcd8GQ8rl0A4RfveuWGdX22QNF2eNwv63p/61BhQ/pFVlpgVDPdh+2ZwfTn6EKyQKsQ St2AwVniBJBA== X-IronPort-AV: E=McAfee;i="6200,9189,10010"; a="192222782" X-IronPort-AV: E=Sophos;i="5.83,261,1616482800"; d="scan'208";a="192222782" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jun 2021 09:50:55 -0700 IronPort-SDR: n5c0T3G5KK/Goh05BSVjE5PJA8PmXkQ6HihPOoCjTPdlPcA8nqm0eaiqCK4jiv2IIu+lLEnyZc XkUqSyolekXg== X-IronPort-AV: E=Sophos;i="5.83,261,1616482800"; d="scan'208";a="482452049" Received: from ochaldek-mobl.ger.corp.intel.com (HELO localhost) ([10.252.34.111]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jun 2021 09:50:53 -0700 From: Jani Nikula To: intel-gfx@lists.freedesktop.org In-Reply-To: <20210603122842.22496-2-jani.nikula@intel.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20210603122842.22496-1-jani.nikula@intel.com> <20210603122842.22496-2-jani.nikula@intel.com> Date: Wed, 09 Jun 2021 19:50:50 +0300 Message-ID: <87pmwvyob9.fsf@intel.com> MIME-Version: 1.0 Subject: Re: [Intel-gfx] [PATCH 2/2] drm/i915/dsc: use crtc index for bigjoiner primary/secondary crtc 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 Thu, 03 Jun 2021, Jani Nikula wrote: > Pipe numbering isn't guaranteed to be contiguous; there may be fused off > pipes in the middle. The current bigjoiner primary/secondary crtc lookup > with pipe +/- 1 does not take this into account, and may fail > unexpectedly. Fixing this while using pipe numbering gets complicated. This is broken; pipes need to be contiguous for big joiner regardless of whether pipes have been fused off. BR, Jani. > > Switch to using crtc index +/- 1 instead. They are contiguous, and the > crtc lookup neatly handles overflows and underflows. The performance > penalty from the crtc list lookup is neglible. > > Fixes: 8a029c113b17 ("drm/i915/dp: Modify VDSC helpers to configure DSC for Bigjoiner slave") > Fixes: d961eb20adb6 ("drm/i915/bigjoiner: atomic commit changes for uncompressed joiner") > Cc: Animesh Manna > Cc: Manasi Navare > Cc: Vandita Kulkarni > Signed-off-by: Jani Nikula > --- > drivers/gpu/drm/i915/display/intel_vdsc.c | 31 +++++++++++------------ > 1 file changed, 15 insertions(+), 16 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c > index 1fd81bd3ea09..1d757b040bce 100644 > --- a/drivers/gpu/drm/i915/display/intel_vdsc.c > +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c > @@ -1106,30 +1106,29 @@ static i915_reg_t dss_ctl2_reg(const struct intel_crtc_state *crtc_state) > return is_pipe_dsc(crtc_state) ? ICL_PIPE_DSS_CTL2(pipe) : DSS_CTL2; > } > > -struct intel_crtc * > -intel_dsc_get_bigjoiner_secondary(const struct intel_crtc *primary_crtc) > +static struct intel_crtc * > +get_linked_crtc(const struct intel_crtc *crtc, int index) > { > - struct drm_i915_private *i915 = to_i915(primary_crtc->base.dev); > - enum pipe pipe = primary_crtc->pipe + 1; > + struct drm_i915_private *i915 = to_i915(crtc->base.dev); > + struct intel_crtc *linked_crtc; > > - if (drm_WARN_ON(&i915->drm, pipe >= I915_MAX_PIPES || > - !(INTEL_INFO(i915)->pipe_mask & BIT(pipe)))) > - return NULL; > + linked_crtc = to_intel_crtc(drm_crtc_from_index(&i915->drm, index)); > > - return intel_get_crtc_for_pipe(i915, pipe); > + drm_WARN_ON(&i915->drm, !linked_crtc); > + > + return linked_crtc; > } > > struct intel_crtc * > -intel_dsc_get_bigjoiner_primary(const struct intel_crtc *secondary_crtc) > +intel_dsc_get_bigjoiner_secondary(const struct intel_crtc *primary_crtc) > { > - struct drm_i915_private *i915 = to_i915(secondary_crtc->base.dev); > - enum pipe pipe = secondary_crtc->pipe - 1; > - > - if (drm_WARN_ON(&i915->drm, pipe <= INVALID_PIPE || > - !(INTEL_INFO(i915)->pipe_mask & BIT(pipe)))) > - return NULL; > + return get_linked_crtc(primary_crtc, primary_crtc->base.index + 1); > +} > > - return intel_get_crtc_for_pipe(i915, pipe); > +struct intel_crtc * > +intel_dsc_get_bigjoiner_primary(const struct intel_crtc *secondary_crtc) > +{ > + return get_linked_crtc(secondary_crtc, secondary_crtc->base.index - 1); > } > > void intel_uncompressed_joiner_enable(const struct intel_crtc_state *crtc_state) -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx