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=-10.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT autolearn=unavailable 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 14AA1C56202 for ; Sun, 15 Nov 2020 00:14:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF1D52415A for ; Sun, 15 Nov 2020 00:14:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ey5LMsHW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726456AbgKOAO1 (ORCPT ); Sat, 14 Nov 2020 19:14:27 -0500 Received: from mail.kernel.org ([198.145.29.99]:37638 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726265AbgKOAO1 (ORCPT ); Sat, 14 Nov 2020 19:14:27 -0500 Received: from DESKTOP-GFFITBK.localdomain (218-161-90-76.HINET-IP.hinet.net [218.161.90.76]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E7992239D2; Sun, 15 Nov 2020 00:14:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605399266; bh=aFodP6QBgsn9xkYrio2coFUfOEugpYzOvzPkPjiijz4=; h=From:To:Cc:Subject:Date:From; b=ey5LMsHWOGuLxIFw7YVnb+bfMgjlg16qCiKGZDHQAJbRmq7Su1LHKYnDJCgOfXUS6 PXXZd9LlW3wB78nNjrdOEbPKzs7VvbtKTRaJXeJlXvZ1PBkxLDEp7l97V7WZwJ4/w4 67x+xF6/BYtdG13/jeY6rZk0OpHCZf2hVaHYkJcs= From: Chun-Kuang Hu To: Jitao Shi , Bilal Wasim , Philipp Zabel , David Airlie , Daniel Vetter Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, CK Hu , Chun-Kuang Hu Subject: [PATCH] drm/mediatek: dsi: Calculate horizontal_backporch_byte by itself Date: Sun, 15 Nov 2020 08:14:03 +0800 Message-Id: <20201115001403.7833-1-chunkuang.hu@kernel.org> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: CK Hu Using vm->hfront_porch + vm->hback_porch to calculate horizontal_backporch_byte would make it negtive, so use horizontal_backporch_byte itself to make it positive. Fixes: 35bf948f1edb ("drm/mediatek: dsi: Fix scrolling of panel with small hfp or hbp") Signed-off-by: CK Hu Signed-off-by: Chun-Kuang Hu --- drivers/gpu/drm/mediatek/mtk_dsi.c | 53 ++++++++++-------------------- 1 file changed, 18 insertions(+), 35 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 4a188a942c38..2a64fdaed9a7 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -444,7 +444,10 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi) u32 horizontal_sync_active_byte; u32 horizontal_backporch_byte; u32 horizontal_frontporch_byte; + u32 horizontal_front_back_byte; + u32 data_phy_cycles_byte; u32 dsi_tmp_buf_bpp, data_phy_cycles; + u32 delta; struct mtk_phy_timing *timing = &dsi->phy_timing; struct videomode *vm = &dsi->vm; @@ -474,42 +477,22 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi) data_phy_cycles = timing->lpx + timing->da_hs_prepare + timing->da_hs_zero + timing->da_hs_exit; - if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) { - if ((vm->hfront_porch + vm->hback_porch) * dsi_tmp_buf_bpp > - data_phy_cycles * dsi->lanes + 18) { - horizontal_frontporch_byte = - vm->hfront_porch * dsi_tmp_buf_bpp - - (data_phy_cycles * dsi->lanes + 18) * - vm->hfront_porch / - (vm->hfront_porch + vm->hback_porch); - - horizontal_backporch_byte = - horizontal_backporch_byte - - (data_phy_cycles * dsi->lanes + 18) * - vm->hback_porch / - (vm->hfront_porch + vm->hback_porch); - } else { - DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n"); - horizontal_frontporch_byte = vm->hfront_porch * - dsi_tmp_buf_bpp; - } + delta = dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST ? 18 : 12; + + horizontal_frontporch_byte = vm->hfront_porch * dsi_tmp_buf_bpp; + horizontal_front_back_byte = horizontal_frontporch_byte + horizontal_backporch_byte; + data_phy_cycles_byte = data_phy_cycles * dsi->lanes + delta; + + if (horizontal_front_back_byte > data_phy_cycles_byte) { + horizontal_frontporch_byte -= data_phy_cycles_byte * + horizontal_frontporch_byte / + horizontal_front_back_byte; + + horizontal_backporch_byte -= data_phy_cycles_byte * + horizontal_backporch_byte / + horizontal_front_back_byte; } else { - if ((vm->hfront_porch + vm->hback_porch) * dsi_tmp_buf_bpp > - data_phy_cycles * dsi->lanes + 12) { - horizontal_frontporch_byte = - vm->hfront_porch * dsi_tmp_buf_bpp - - (data_phy_cycles * dsi->lanes + 12) * - vm->hfront_porch / - (vm->hfront_porch + vm->hback_porch); - horizontal_backporch_byte = horizontal_backporch_byte - - (data_phy_cycles * dsi->lanes + 12) * - vm->hback_porch / - (vm->hfront_porch + vm->hback_porch); - } else { - DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n"); - horizontal_frontporch_byte = vm->hfront_porch * - dsi_tmp_buf_bpp; - } + DRM_WARN("HFP + HBP less than d-phy, FPS will under 60Hz\n"); } writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC); -- 2.17.1