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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 49A42C432C3 for ; Tue, 22 Dec 2020 13:11:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 28EB923133 for ; Tue, 22 Dec 2020 13:11:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727190AbgLVNLR (ORCPT ); Tue, 22 Dec 2020 08:11:17 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:33856 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726885AbgLVNLR (ORCPT ); Tue, 22 Dec 2020 08:11:17 -0500 X-UUID: f5ee02fdf024403f886cc9a73d821529-20201222 X-UUID: f5ee02fdf024403f886cc9a73d821529-20201222 Received: from mtkexhb01.mediatek.inc [(172.21.101.102)] by mailgw02.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.14 Build 0819 with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 489946339; Tue, 22 Dec 2020 21:09:53 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 22 Dec 2020 21:09:50 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 22 Dec 2020 21:09:49 +0800 From: Weiyi Lu To: Matthias Brugger , Rob Herring , Stephen Boyd , Nicolas Boichat CC: , , , , , , Weiyi Lu Subject: [PATCH v6 07/22] clk: mediatek: Fix asymmetrical PLL enable and disable control Date: Tue, 22 Dec 2020 21:09:32 +0800 Message-ID: <1608642587-15634-8-git-send-email-weiyi.lu@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1608642587-15634-1-git-send-email-weiyi.lu@mediatek.com> References: <1608642587-15634-1-git-send-email-weiyi.lu@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org In fact, the en_mask is a combination of divider enable mask and pll enable bit(bit0). Before this patch, we enabled both divider mask and bit0 in prepare(), but only cleared the bit0 in unprepare(). In the future, we hope en_mask will only be used as divider enable mask. The enable register(CON0) will be set in 2 steps: first is divider mask, and then bit0 during prepare(), and vice versa. But considering backward compatibility, at this stage we allow en_mask to be a combination or a pure divider enable mask. And then we will make en_mask a pure divider enable mask in another following patch series. Signed-off-by: Weiyi Lu --- drivers/clk/mediatek/clk-pll.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c index f440f2cd..11ed5d1 100644 --- a/drivers/clk/mediatek/clk-pll.c +++ b/drivers/clk/mediatek/clk-pll.c @@ -238,6 +238,7 @@ static int mtk_pll_prepare(struct clk_hw *hw) { struct mtk_clk_pll *pll = to_mtk_clk_pll(hw); u32 r; + u32 div_en_mask; r = readl(pll->pwr_addr) | CON0_PWR_ON; writel(r, pll->pwr_addr); @@ -247,10 +248,15 @@ static int mtk_pll_prepare(struct clk_hw *hw) writel(r, pll->pwr_addr); udelay(1); - r = readl(pll->base_addr + REG_CON0); - r |= pll->data->en_mask; + r = readl(pll->base_addr + REG_CON0) | CON0_BASE_EN; writel(r, pll->base_addr + REG_CON0); + div_en_mask = pll->data->en_mask & ~CON0_BASE_EN; + if (div_en_mask) { + r = readl(pll->base_addr + REG_CON0) | div_en_mask; + writel(r, pll->base_addr + REG_CON0); + } + __mtk_pll_tuner_enable(pll); udelay(20); @@ -268,6 +274,7 @@ static void mtk_pll_unprepare(struct clk_hw *hw) { struct mtk_clk_pll *pll = to_mtk_clk_pll(hw); u32 r; + u32 div_en_mask; if (pll->data->flags & HAVE_RST_BAR) { r = readl(pll->base_addr + REG_CON0); @@ -277,8 +284,13 @@ static void mtk_pll_unprepare(struct clk_hw *hw) __mtk_pll_tuner_disable(pll); - r = readl(pll->base_addr + REG_CON0); - r &= ~CON0_BASE_EN; + div_en_mask = pll->data->en_mask & ~CON0_BASE_EN; + if (div_en_mask) { + r = readl(pll->base_addr + REG_CON0) & ~div_en_mask; + writel(r, pll->base_addr + REG_CON0); + } + + r = readl(pll->base_addr + REG_CON0) & ~CON0_BASE_EN; writel(r, pll->base_addr + REG_CON0); r = readl(pll->pwr_addr) | CON0_ISO_EN; -- 1.8.1.1.dirty