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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 BF8DDC43141 for ; Thu, 14 Nov 2019 03:38:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C83BF206E1 for ; Thu, 14 Nov 2019 03:38:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=nxp.com header.i=@nxp.com header.b="cfPILI8w" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727119AbfKNDic (ORCPT ); Wed, 13 Nov 2019 22:38:32 -0500 Received: from mail-eopbgr20088.outbound.protection.outlook.com ([40.107.2.88]:35749 "EHLO EUR02-VE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726393AbfKNDib (ORCPT ); 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received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 2lPMtvP9KTUnySnwLQ76TxhyIiYsrpxK4r//pmQB6Mx1G11Mx/QJQue9ZJIsS0UMCSzEvZZbsM2IwBWeAOsaFHcCjJMwWFOdeBbNy9HC3ifaYghiHlHK0DytnGft/X7fNjRFBUi+FeQ6d2xpfqd0tO24NnDDJGMRGT7hUpSYnyHKoxRQSQQih/FDTkgj3/urn2kvYRkg/Xl7nY15KwCYrYTii6R3WTx9JgiedqKhiYjznFZ163WwPVKSDfl5s12hOjWBwAumGYFMWrCRsyxpeepD7jfYr3YEg2pGBqUXJXYBLt2AqbKMakG76qCqC08R3acmKVSzEpQWj1L7Km8nk5o+KRMRErYC22dRUVdqT7Y82QeS+XBvfZOJLTBD9SBbFY1dpCYRe74lazAiH33iYi4XAkzpOCVzc1STqYGFfPzDucCwT5W9340PwMF1mx+x Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: da549bda-804d-468b-620c-08d768b41cc1 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Nov 2019 03:38:28.3601 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: UmiA5ztVMKze12N/dUmnQA4a7HHfUsNqbDuYfrBqZPvuJUOPBBkfgsOvtzQVe6zb5WA7pkh3i3l/8+LhXSym9Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB4994 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peng Fan writel/readl has a barrier, however that barrier is not needed, because device memory mapping is nGnRE mapping and access is in order and clk driver has spin lock or other lock to make sure write finished. It is ok to use relaxed api here, no need to use stronger readl/writel Signed-off-by: Peng Fan --- drivers/clk/imx/clk-composite-8m.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/clk/imx/clk-composite-8m.c b/drivers/clk/imx/clk-compo= site-8m.c index 20f7c91c03d2..513dc57483d0 100644 --- a/drivers/clk/imx/clk-composite-8m.c +++ b/drivers/clk/imx/clk-composite-8m.c @@ -31,14 +31,14 @@ static unsigned long imx8m_clk_composite_divider_recalc= _rate(struct clk_hw *hw, unsigned int prediv_value; unsigned int div_value; =20 - prediv_value =3D readl(divider->reg) >> divider->shift; + prediv_value =3D readl_relaxed(divider->reg) >> divider->shift; prediv_value &=3D clk_div_mask(divider->width); =20 prediv_rate =3D divider_recalc_rate(hw, parent_rate, prediv_value, NULL, divider->flags, divider->width); =20 - div_value =3D readl(divider->reg) >> PCG_DIV_SHIFT; + div_value =3D readl_relaxed(divider->reg) >> PCG_DIV_SHIFT; div_value &=3D clk_div_mask(PCG_DIV_WIDTH); =20 return divider_recalc_rate(hw, prediv_rate, div_value, NULL, @@ -104,13 +104,13 @@ static int imx8m_clk_composite_divider_set_rate(struc= t clk_hw *hw, =20 spin_lock_irqsave(divider->lock, flags); =20 - val =3D readl(divider->reg); + val =3D readl_relaxed(divider->reg); val &=3D ~((clk_div_mask(divider->width) << divider->shift) | (clk_div_mask(PCG_DIV_WIDTH) << PCG_DIV_SHIFT)); =20 val |=3D (u32)(prediv_value - 1) << divider->shift; val |=3D (u32)(div_value - 1) << PCG_DIV_SHIFT; - writel(val, divider->reg); + writel_relaxed(val, divider->reg); =20 spin_unlock_irqrestore(divider->lock, flags); =20 --=20 2.16.4 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 48551C432C3 for ; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Peng Fan writel/readl has a barrier, however that barrier is not needed, because device memory mapping is nGnRE mapping and access is in order and clk driver has spin lock or other lock to make sure write finished. It is ok to use relaxed api here, no need to use stronger readl/writel Signed-off-by: Peng Fan --- drivers/clk/imx/clk-composite-8m.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/clk/imx/clk-composite-8m.c b/drivers/clk/imx/clk-composite-8m.c index 20f7c91c03d2..513dc57483d0 100644 --- a/drivers/clk/imx/clk-composite-8m.c +++ b/drivers/clk/imx/clk-composite-8m.c @@ -31,14 +31,14 @@ static unsigned long imx8m_clk_composite_divider_recalc_rate(struct clk_hw *hw, unsigned int prediv_value; unsigned int div_value; - prediv_value = readl(divider->reg) >> divider->shift; + prediv_value = readl_relaxed(divider->reg) >> divider->shift; prediv_value &= clk_div_mask(divider->width); prediv_rate = divider_recalc_rate(hw, parent_rate, prediv_value, NULL, divider->flags, divider->width); - div_value = readl(divider->reg) >> PCG_DIV_SHIFT; + div_value = readl_relaxed(divider->reg) >> PCG_DIV_SHIFT; div_value &= clk_div_mask(PCG_DIV_WIDTH); return divider_recalc_rate(hw, prediv_rate, div_value, NULL, @@ -104,13 +104,13 @@ static int imx8m_clk_composite_divider_set_rate(struct clk_hw *hw, spin_lock_irqsave(divider->lock, flags); - val = readl(divider->reg); + val = readl_relaxed(divider->reg); val &= ~((clk_div_mask(divider->width) << divider->shift) | (clk_div_mask(PCG_DIV_WIDTH) << PCG_DIV_SHIFT)); val |= (u32)(prediv_value - 1) << divider->shift; val |= (u32)(div_value - 1) << PCG_DIV_SHIFT; - writel(val, divider->reg); + writel_relaxed(val, divider->reg); spin_unlock_irqrestore(divider->lock, flags); -- 2.16.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel