From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754338AbcGHJF6 (ORCPT ); Fri, 8 Jul 2016 05:05:58 -0400 Received: from mail-pf0-f194.google.com ([209.85.192.194]:36124 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754278AbcGHJFl (ORCPT ); Fri, 8 Jul 2016 05:05:41 -0400 From: Chris Zhong To: dianders@chromium.org, tfiga@chromium.org, heiko@sntech.de, yzq@rock-chips.com Cc: linux-rockchip@lists.infradead.org, Chris Zhong , Mark Yao , David Airlie , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 7/7] drm/rockchip: dw-mipi: fix insufficient bandwidth of some panel Date: Fri, 8 Jul 2016 17:05:01 +0800 Message-Id: <1467968701-15620-8-git-send-email-zyw@rock-chips.com> X-Mailer: git-send-email 2.6.3 In-Reply-To: <1467968701-15620-1-git-send-email-zyw@rock-chips.com> References: <1467968701-15620-1-git-send-email-zyw@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Set the lanes bps to 1 / 0.9 times of pclk, the margin is not enough for some panel, it will cause the screen display is not normal, so increases the badnwidth to 1 / 0.8. Signed-off-by: Chris Zhong --- drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c index 8401185..fca7dde 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c @@ -503,8 +503,8 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi) mpclk = DIV_ROUND_UP(dsi->mode->clock, MSEC_PER_SEC); if (mpclk) { - /* take 1 / 0.9, since mbps must big than bandwidth of RGB */ - tmp = mpclk * (bpp / dsi->lanes) * 10 / 9; + /* take 1 / 0.8, since mbps must big than bandwidth of RGB */ + tmp = mpclk * (bpp / dsi->lanes) * 10 / 8; if (tmp < max_mbps) target_mbps = tmp; else -- 2.6.3