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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,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 89140C072B1 for ; Thu, 30 May 2019 04:05:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 554A025031 for ; Thu, 30 May 2019 04:05:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559189103; bh=uaRMoL5wlZ6kDLSuDyHVPV2xn/4AO4FX8g0HIPN9Oco=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=A2RdpjaJQcKXwL81Rnr+7t/V7MrbZybjO0KnSyCwMewh1ZpD6oX9MTJQfsrE0Etqx 2GJVwdDXkVTt9UH9gdrAGKnTJ0cYmVjvgacZdkshGUYAqsv/Upcvrg0Fvd9utpKdHA iQ/JauQH0PVrWfwZ0/NeUDikQWz4J/wYTIMZCxlA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731255AbfE3DRs (ORCPT ); Wed, 29 May 2019 23:17:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:48276 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731248AbfE3DRr (ORCPT ); Wed, 29 May 2019 23:17:47 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4B015246F4; Thu, 30 May 2019 03:17:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186267; bh=uaRMoL5wlZ6kDLSuDyHVPV2xn/4AO4FX8g0HIPN9Oco=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Govy9GKyA8CXpPM+VZ6GKrZzgUWw4ZG86RwOG4xAO9Hf+AprTGxKXQMgJKz7/rn33 SYVYnoFnHZM4dCAHP06h8x1ol3IDYxpfZwp314ySWgJgGRiG9BRwRYJA+3BBreXoHR HrubZO7VRqJM5SndFJb+DKag8o9YlkM9vvGgUoXI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Yannick=20Fertr=C3=A9?= , Philippe Cornu , Thierry Reding , Sasha Levin Subject: [PATCH 4.19 203/276] drm/panel: otm8009a: Add delay at the end of initialization Date: Wed, 29 May 2019 20:06:01 -0700 Message-Id: <20190530030537.820652297@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030523.133519668@linuxfoundation.org> References: <20190530030523.133519668@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 0084c3c71126fc878c6dab8a6ab8ecc484c2be02 ] At the end of initialization, a delay is required by the panel. Without this delay, the panel could received a frame early & generate a crash of panel (black screen). Signed-off-by: Yannick Fertré Reviewed-by: Philippe Cornu Tested-by: Philippe Cornu Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/1553155445-13407-1-git-send-email-yannick.fertre@st.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c index 87fa316e1d7b0..58ccf648b70fb 100644 --- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c +++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c @@ -248,6 +248,9 @@ static int otm8009a_init_sequence(struct otm8009a *ctx) /* Send Command GRAM memory write (no parameters) */ dcs_write_seq(ctx, MIPI_DCS_WRITE_MEMORY_START); + /* Wait a short while to let the panel be ready before the 1st frame */ + mdelay(10); + return 0; } -- 2.20.1