From patchwork Wed Oct 26 18:28:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marijn Suijten X-Patchwork-Id: 13020962 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA881C38A2D for ; Wed, 26 Oct 2022 18:28:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233657AbiJZS2t (ORCPT ); Wed, 26 Oct 2022 14:28:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234402AbiJZS2i (ORCPT ); Wed, 26 Oct 2022 14:28:38 -0400 Received: from relay06.th.seeweb.it (relay06.th.seeweb.it [IPv6:2001:4b7a:2000:18::167]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84F9CDD8B7 for ; Wed, 26 Oct 2022 11:28:36 -0700 (PDT) Received: from localhost.localdomain (94-209-172-39.cable.dynamic.v4.ziggo.nl [94.209.172.39]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by m-r2.th.seeweb.it (Postfix) with ESMTPSA id 882063F33A; Wed, 26 Oct 2022 20:28:33 +0200 (CEST) From: Marijn Suijten To: phone-devel@vger.kernel.org, Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Vinod Koul Cc: ~postmarketos/upstreaming@lists.sr.ht, AngeloGioacchino Del Regno , Konrad Dybcio , Martin Botka , Jami Kettunen , Marijn Suijten , Sean Paul , David Airlie , Daniel Vetter , Douglas Anderson , Vladimir Lypak , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 00/10] drm/msm: Fix math issues in MSM DSC implementation Date: Wed, 26 Oct 2022 20:28:14 +0200 Message-Id: <20221026182824.876933-1-marijn.suijten@somainline.org> X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Various removals of complex yet unnecessary math, fixing all uses of drm_dsc_config::bits_per_pixel to deal with the fact that this field includes four fractional bits, and finally making sure that range_bpg_offset contains values 6-bits wide to prevent overflows in drm_dsc_pps_payload_pack(). Altogether this series is responsible for solving _all_ Display Stream Compression issues and artifacts on the Sony Tama (sdm845) Akatsuki smartphone (2880x1440p). Changes since v3: - Swap patch 7 and 8 to make sure msm_host is available inside dsi_populate_dsc_params(); - Reword patch 6 (Migrate to drm_dsc_compute_rc_parameters()) to more clearly explain why the FIXME wasn't solved initially, but why it can (and should!) be resolved now. v3: https://lore.kernel.org/linux-arm-msm/20221009184824.457416-1-marijn.suijten@somainline.org/T/#u Changes since v2: - Generalize mux_word_size setting depending on bits_per_component; - Migrate DSI's DSC calculations to drm_dsc_compute_rc_parameters(), implicitly addressing existing math issues; - Disallow any bits_per_component other than 8, until hardcoded values are updated and tested to support such cases. v2: https://lore.kernel.org/linux-arm-msm/20221005181657.784375-1-marijn.suijten@somainline.org/T/#u Changes since v1: - Propagate r-b's, except (obviously) in patches that were (heavily) modified; - Remove accidental debug code in dsi_cmd_dma_add; - Move Range BPG Offset masking out of DCS PPS packing, back into the DSI driver when it is assigned to drm_dsc_config (this series is now strictly focusing on drm/msm again); - Replace modulo-check resulting in conditional increment with DIV_ROUND_UP; - Remove repeated calculation of slice_chunk_size; - Use u16 instead of int when handling bits_per_pixel; - Use DRM_DEV_ERROR instead of pr_err in DSI code; - Also remove redundant target_bpp_x16 variable. v1: https://lore.kernel.org/linux-arm-msm/20221001190807.358691-1-marijn.suijten@somainline.org/T/#u Marijn Suijten (10): drm/msm/dsi: Remove useless math in DSC calculations drm/msm/dsi: Remove repeated calculation of slice_per_intf drm/msm/dsi: Use DIV_ROUND_UP instead of conditional increment on modulo drm/msm/dsi: Reuse earlier computed dsc->slice_chunk_size drm/msm/dsi: Appropriately set dsc->mux_word_size based on bpc drm/msm/dsi: Migrate to drm_dsc_compute_rc_parameters() drm/msm/dsi: Account for DSC's bits_per_pixel having 4 fractional bits drm/msm/dsi: Disallow 8 BPC DSC configuration for alternative BPC values drm/msm/dpu1: Account for DSC's bits_per_pixel having 4 fractional bits drm/msm/dsi: Prevent signed BPG offsets from bleeding into adjacent bits drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c | 11 +- drivers/gpu/drm/msm/dsi/dsi_host.c | 121 ++++++--------------- 2 files changed, 37 insertions(+), 95 deletions(-) --- 2.38.1