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[23.128.96.18]) by mx.google.com with ESMTP id a1si8562059edx.506.2021.09.13.15.59.45; Mon, 13 Sep 2021 16:00:09 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=KJycALvS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347877AbhIMOfh (ORCPT + 99 others); Mon, 13 Sep 2021 10:35:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:51516 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347121AbhIMOaP (ORCPT ); Mon, 13 Sep 2021 10:30:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 56A2961B5D; Mon, 13 Sep 2021 13:51:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631541072; bh=0x6AMwLtktK0p++DEgX0mX/VHgOCE3g17gLFp+HbpAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KJycALvSWLRyT47FrhE+MfKDwvReWXC5F7gSuDnICs21IPKWJcdFFtL5PXraCGirR pbJTZaXWwB41HsqAB9X/biNl8R3kTY6JLF1yxczxyOnv5Pmfl3NptNTB4p2H02ua43 8vW9D0IER6CkxV/LWcMtkSX74KVLc7/UDULkERcY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Douglas Anderson , Robert Foss , Sean Paul , Sam Ravnborg , Sasha Levin Subject: [PATCH 5.14 151/334] drm/bridge: ti-sn65dsi86: Add some 100 us delays Date: Mon, 13 Sep 2021 15:13:25 +0200 Message-Id: <20210913131118.465891522@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131113.390368911@linuxfoundation.org> References: <20210913131113.390368911@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Douglas Anderson [ Upstream commit e183bf31cf0d3a05162e633e428350ed176ce926 ] The manual has always said that we need 100 us delays in a few places. Though it hasn't seemed to be a big deal to skip these, let's add them in case it makes something happier. NOTE: this fixes no known issues but it seems good to make it right. Fixes: a095f15c00e2 ("drm/bridge: add support for sn65dsi86 bridge driver") Signed-off-by: Douglas Anderson Acked-by: Robert Foss Reviewed-by: Sean Paul Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20210730084534.v2.3.I842d483139531aa4651da8338512fdf0171ff23c@changeid Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index ecd4fa3a9a1d..c9cddf317c72 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -304,6 +304,9 @@ static int __maybe_unused ti_sn65dsi86_resume(struct device *dev) return ret; } + /* td2: min 100 us after regulators before enabling the GPIO */ + usleep_range(100, 110); + gpiod_set_value(pdata->enable_gpio, 1); /* @@ -886,6 +889,9 @@ static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) if (!pdata->refclk) ti_sn65dsi86_enable_comms(pdata); + + /* td7: min 100 us after enable before DSI data */ + usleep_range(100, 110); } static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) -- 2.30.2