From patchwork Mon Feb 28 17:25:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 546986 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CB85C433EF for ; Mon, 28 Feb 2022 18:10:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237202AbiB1SL0 (ORCPT ); Mon, 28 Feb 2022 13:11:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60136 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241420AbiB1SJx (ORCPT ); Mon, 28 Feb 2022 13:09:53 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8907DB3E7B; Mon, 28 Feb 2022 09:50:01 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0192560B2A; Mon, 28 Feb 2022 17:49:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 16579C340E7; Mon, 28 Feb 2022 17:49:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1646070598; bh=haevhic5ONx/+txP4DA9/u0qEZ0jnqnha+YONaK2HDk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yvmxQC2uxUGavq1jcJedPDxJh+v6HZwf0/EkYQAG2IAeaJfigD9CgoYESBVusVKYS SnmbFgtBez1woSbeeIrv4CDc1WE65zmhEAbzucXN2FO2GAsOPfUhqMsimoxjyAIK4I t9jxW5J4m672JUpWt8q9zqj/zXq67cTrZGdBquWY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Graute Subject: [PATCH 5.16 147/164] staging: fbtft: fb_st7789v: reset display before initialization Date: Mon, 28 Feb 2022 18:25:09 +0100 Message-Id: <20220228172413.180337440@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220228172359.567256961@linuxfoundation.org> References: <20220228172359.567256961@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Oliver Graute commit b6821b0d9b56386d2bf14806f90ec401468c799f upstream. In rare cases the display is flipped or mirrored. This was observed more often in a low temperature environment. A clean reset on init_display() should help to get registers in a sane state. Fixes: ef8f317795da (staging: fbtft: use init function instead of init sequence) Cc: stable@vger.kernel.org Signed-off-by: Oliver Graute Link: https://lore.kernel.org/r/20220210085322.15676-1-oliver.graute@kococonnector.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/fbtft/fb_st7789v.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/staging/fbtft/fb_st7789v.c +++ b/drivers/staging/fbtft/fb_st7789v.c @@ -144,6 +144,8 @@ static int init_display(struct fbtft_par { int rc; + par->fbtftops.reset(par); + rc = init_tearing_effect_line(par); if (rc) return rc;