From patchwork Mon May 10 10:20:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 433764 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 32B50C43618 for ; Mon, 10 May 2021 11:10:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1343561108 for ; Mon, 10 May 2021 11:10:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234166AbhEJLJo (ORCPT ); Mon, 10 May 2021 07:09:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:34818 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235379AbhEJLAu (ORCPT ); Mon, 10 May 2021 07:00:50 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 55C3061A46; Mon, 10 May 2021 10:53:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620644005; bh=iP8Xl5cIV0qr7oBh+yfEjl1AhKiBKCLTrvuWfKZd+bY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AfQyuoDjqDScyL6jgxaKnNegYaLI9rrqAIkiAB5g+ZE5pKMdhvGZAJGH6IM7eQ65Z l87iGGj4UolauNFaME+ndpWTXLQnJlpy9Op/ZqhRfCRgDL3xYm/Rlh0/zKvBCKt/xV xZsYY1oXdJe6sNK47TZvaehnBE39oxNISYuLK7+U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, AngeloGioacchino Del Regno , Marijn Suijten , Rob Clark , Sasha Levin Subject: [PATCH 5.11 214/342] drm/msm/mdp5: Do not multiply vclk line count by 100 Date: Mon, 10 May 2021 12:20:04 +0200 Message-Id: <20210510102017.161905828@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510102010.096403571@linuxfoundation.org> References: <20210510102010.096403571@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Marijn Suijten [ Upstream commit 377569f82ea8228c421cef4da33e056a900b58ca ] Neither vtotal nor drm_mode_vrefresh contain a value that is premultiplied by 100 making the x100 variable name incorrect and resulting in vclks_line to become 100 times larger than it is supposed to be. The hardware counts 100 clockticks too many before tearcheck, leading to severe panel issues on at least the Sony Xperia lineup. This is likely an artifact from the original MDSS DSI panel driver where the calculation [1] corrected for a premultiplied reference framerate by 100 [2]. It does not appear that the above values were ever premultiplied in the history of the DRM MDP5 driver. With this change applied the value written to the SYNC_CONFIG_VSYNC register is now identical to downstream kernels. [1]: https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/drivers/video/msm/mdss/mdss_mdp_intf_cmd.c?h=LA.UM.8.6.c26-02400-89xx.0#n288 [2]: https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/drivers/video/msm/mdss/mdss_dsi_panel.c?h=LA.UM.8.6.c26-02400-89xx.0#n1648 Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Marijn Suijten Link: https://lore.kernel.org/r/20210406214726.131534-3-marijn.suijten@somainline.org Signed-off-by: Rob Clark Signed-off-by: Sasha Levin --- drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c index f6df4d3b1406..0392d4dfe270 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c @@ -20,7 +20,7 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder, { struct mdp5_kms *mdp5_kms = get_kms(encoder); struct device *dev = encoder->dev->dev; - u32 total_lines_x100, vclks_line, cfg; + u32 total_lines, vclks_line, cfg; long vsync_clk_speed; struct mdp5_hw_mixer *mixer = mdp5_crtc_get_mixer(encoder->crtc); int pp_id = mixer->pp; @@ -30,8 +30,8 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder, return -EINVAL; } - total_lines_x100 = mode->vtotal * drm_mode_vrefresh(mode); - if (!total_lines_x100) { + total_lines = mode->vtotal * drm_mode_vrefresh(mode); + if (!total_lines) { DRM_DEV_ERROR(dev, "%s: vtotal(%d) or vrefresh(%d) is 0\n", __func__, mode->vtotal, drm_mode_vrefresh(mode)); return -EINVAL; @@ -43,7 +43,7 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder, vsync_clk_speed); return -EINVAL; } - vclks_line = vsync_clk_speed * 100 / total_lines_x100; + vclks_line = vsync_clk_speed / total_lines; cfg = MDP5_PP_SYNC_CONFIG_VSYNC_COUNTER_EN | MDP5_PP_SYNC_CONFIG_VSYNC_IN_EN;