From patchwork Tue Mar 21 12:15:53 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 95621 Delivered-To: patch@linaro.org Received: by 10.182.3.34 with SMTP id 2csp1796538obz; Tue, 21 Mar 2017 05:16:41 -0700 (PDT) X-Received: by 10.99.67.1 with SMTP id q1mr38039230pga.210.1490098601581; Tue, 21 Mar 2017 05:16:41 -0700 (PDT) Return-Path: Received: from gabe.freedesktop.org (gabe.freedesktop.org. [131.252.210.177]) by mx.google.com with ESMTPS id f8si21138437plk.181.2017.03.21.05.16.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Mar 2017 05:16:41 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 131.252.210.177 as permitted sender) client-ip=131.252.210.177; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 131.252.210.177 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B34D08989C; Tue, 21 Mar 2017 12:16:40 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 808158989C for ; Tue, 21 Mar 2017 12:16:39 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A54D820357; Tue, 21 Mar 2017 12:16:38 +0000 (UTC) Received: from localhost.localdomain (li411-102.members.linode.com [106.187.91.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8A0C8202E5; Tue, 21 Mar 2017 12:16:33 +0000 (UTC) From: Shawn Guo To: dri-devel@lists.freedesktop.org Subject: [PATCH 1/4] drm: zte: do not enable clock auto-gating by default Date: Tue, 21 Mar 2017 20:15:53 +0800 Message-Id: <1490098556-23853-2-git-send-email-shawnguo@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1490098556-23853-1-git-send-email-shawnguo@kernel.org> References: <1490098556-23853-1-git-send-email-shawnguo@kernel.org> X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Cc: Xin Zhou , Daniel Vetter , Baoyou Xie , Jun Nie X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Shawn Guo Some VOU modules do not work well with clock auto-gating. For example, VGA I2C bus will fail to read EDID data from monitor. Let's not enable this feature by default, and leave it to the possible future low-power optimization. Signed-off-by: Shawn Guo Reviewed-by: Sean Paul --- drivers/gpu/drm/zte/zx_vou.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/gpu/drm/zte/zx_vou.c b/drivers/gpu/drm/zte/zx_vou.c index cf92d675feaa..2a2d90bd9425 100644 --- a/drivers/gpu/drm/zte/zx_vou.c +++ b/drivers/gpu/drm/zte/zx_vou.c @@ -720,9 +720,6 @@ static void vou_hw_init(struct zx_vou_hw *vou) /* Release reset for all VOU modules */ zx_writel(vou->vouctl + VOU_SOFT_RST, ~0); - /* Enable clock auto-gating for all VOU modules */ - zx_writel(vou->vouctl + VOU_CLK_REQEN, ~0); - /* Enable all VOU module clocks */ zx_writel(vou->vouctl + VOU_CLK_EN, ~0);