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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 94663C433F5 for ; Mon, 13 Sep 2021 13:41:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7CB71613E6 for ; Mon, 13 Sep 2021 13:41:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243383AbhIMNmV (ORCPT ); Mon, 13 Sep 2021 09:42:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:35540 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241896AbhIMNgX (ORCPT ); Mon, 13 Sep 2021 09:36:23 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D8F78610CC; Mon, 13 Sep 2021 13:27:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631539666; bh=PVex8fCMaRtC1qcYDJnSUMp3qED/h2jG5k4Z5O2w71o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q04Cv+3SICLheKjgrivrKTWo7SbjOJAZYcQYKDm3syFMXlV2RhY01kl3jil2nRNyH H7wtxXXwt+k6lgsdlUkmUu39zqsbK476BWiJ7/UhyvmBCgBboqp2zy2N6JuYycf3Dw ssH5ewPZ7KbShYiPz6q4jWu3QQuHNkC0XTYmHlfE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marek Vasut , Daniel Abrecht , Emil Velikov , Laurent Pinchart , Lucas Stach , Stefan Agner , Jagan Teki , Sam Ravnborg , Sasha Levin Subject: [PATCH 5.10 113/236] drm: mxsfb: Clear FIFO_CLEAR bit Date: Mon, 13 Sep 2021 15:13:38 +0200 Message-Id: <20210913131104.183068252@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131100.316353015@linuxfoundation.org> References: <20210913131100.316353015@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: Marek Vasut [ Upstream commit 5e23c98178eb1a2cdb7c4fee9a39baf8cabf282d ] Make sure the FIFO_CLEAR bit is latched in when configuring the controller, so that the FIFO is really cleared. And then clear the FIFO_CLEAR bit, since it is not self-clearing. Fixes: 45d59d704080 ("drm: Add new driver for MXSFB controller") Signed-off-by: Marek Vasut Cc: Daniel Abrecht Cc: Emil Velikov Cc: Laurent Pinchart Cc: Lucas Stach Cc: Stefan Agner Reviewed-by: Jagan Teki Tested-by: Jagan Teki # i.Core MX8MM Acked-by: Lucas Stach Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20210620224946.189524-1-marex@denx.de Signed-off-by: Sasha Levin --- drivers/gpu/drm/mxsfb/mxsfb_kms.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index 007ea29abfcc..b535621f4f78 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -243,6 +243,9 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb) /* Clear the FIFOs */ writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET); + readl(mxsfb->base + LCDC_CTRL1); + writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_CLR); + readl(mxsfb->base + LCDC_CTRL1); if (mxsfb->devdata->has_overlay) writel(0, mxsfb->base + LCDC_AS_CTRL); -- 2.30.2