From patchwork Fri Sep 26 08:54:15 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel FERNANDEZ X-Patchwork-Id: 4979391 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 851D69F3DF for ; Fri, 26 Sep 2014 08:59:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9D448202B8 for ; Fri, 26 Sep 2014 08:59:34 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C379E2020F for ; Fri, 26 Sep 2014 08:59:33 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XXRLO-0005XM-4K; Fri, 26 Sep 2014 08:57:38 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XXRJe-0003ck-08 for linux-arm-kernel@lists.infradead.org; Fri, 26 Sep 2014 08:55:51 +0000 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.14.5/8.14.5) with SMTP id s8Q8sjjK017746; Fri, 26 Sep 2014 10:54:47 +0200 Received: from beta.dmz-us.st.com (beta.dmz-us.st.com [167.4.1.35]) by mx08-00178001.pphosted.com with ESMTP id 1pkxpckgfw-1 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Fri, 26 Sep 2014 10:54:47 +0200 Received: from zeta.dmz-us.st.com (ns4.st.com [167.4.16.71]) by beta.dmz-us.st.com (STMicroelectronics) with ESMTP id 18E884FC; Fri, 26 Sep 2014 08:54:42 +0000 (GMT) Received: from mail7.sgp.st.com (unknown [164.129.223.81]) by zeta.dmz-us.st.com (STMicroelectronics) with ESMTP id 020A31C4; Fri, 26 Sep 2014 08:54:38 +0000 (GMT) Received: from lmenx315.lme.st.com ([10.201.19.41]) by mail7.sgp.st.com (MOS 4.3.3-GA) with ESMTP id BZR47793 (AUTH frq07381); Fri, 26 Sep 2014 10:54:30 +0200 From: Gabriel FERNANDEZ To: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Srinivas Kandagatla , Maxime Coquelin , Patrice Chotard , Russell King , Kishon Vijay Abraham I , Grant Likely Subject: [PATCH v3 6/8] phy: miphy28lp: Add SSC support for PCIE Date: Fri, 26 Sep 2014 10:54:15 +0200 Message-Id: <1411721657-9924-7-git-send-email-gabriel.fernandez@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1411721657-9924-1-git-send-email-gabriel.fernandez@linaro.org> References: <1411721657-9924-1-git-send-email-gabriel.fernandez@linaro.org> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.12.52, 1.0.28, 0.0.0000 definitions=2014-09-26_04:2014-09-26, 2014-09-26, 1970-01-01 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140926_015550_477414_D708400D X-CRM114-Status: GOOD ( 12.82 ) X-Spam-Score: -0.7 (/) Cc: devicetree@vger.kernel.org, kernel@stlinux.com, Harsh Gupta , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Lee Jones , Gabriel Fernandez X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 SSC is the technique of modulating the operating frequency of a signal slightly to spread its radiated emissions over a range of frequencies. This reduction in the maximum emission for a given frequency helps meet radiated emission requirements. These settings are applicable for PCIE with Internal clock. Signed-off-by: Harsh Gupta Signed-off-by: Gabriel Fernandez --- drivers/phy/phy-miphy28lp.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/phy/phy-miphy28lp.c b/drivers/phy/phy-miphy28lp.c index 7285543..b6574e8 100644 --- a/drivers/phy/phy-miphy28lp.c +++ b/drivers/phy/phy-miphy28lp.c @@ -579,6 +579,35 @@ static void miphy_sata_tune_ssc(struct miphy28lp_phy *miphy_phy) } } +static void miphy_pcie_tune_ssc(struct miphy28lp_phy *miphy_phy) +{ + u8 val; + + /* Compensate Tx impedance to avoid out of range values */ + /* + * Enable the SSC on PLL for all banks + * SSC Modulation @ 31 KHz and 4000 ppm modulation amp + */ + val = readb_relaxed(miphy_phy->base + MIPHY_BOUNDARY_2); + val |= SSC_EN_SW; + writeb_relaxed(val, miphy_phy->base + MIPHY_BOUNDARY_2); + + val = readb_relaxed(miphy_phy->base + MIPHY_BOUNDARY_SEL); + val |= SSC_SEL; + writeb_relaxed(val, miphy_phy->base + MIPHY_BOUNDARY_SEL); + + for (val = 0; val < 2; val++) { + writeb_relaxed(val, miphy_phy->base + MIPHY_CONF); + writeb_relaxed(0x69, miphy_phy->base + MIPHY_PLL_SBR_3); + writeb_relaxed(0x21, miphy_phy->base + MIPHY_PLL_SBR_4); + writeb_relaxed(0x3c, miphy_phy->base + MIPHY_PLL_SBR_2); + writeb_relaxed(0x21, miphy_phy->base + MIPHY_PLL_SBR_4); + writeb_relaxed(0x00, miphy_phy->base + MIPHY_PLL_SBR_1); + writeb_relaxed(0x02, miphy_phy->base + MIPHY_PLL_SBR_1); + writeb_relaxed(0x00, miphy_phy->base + MIPHY_PLL_SBR_1); + } +} + static inline int miphy28lp_configure_sata(struct miphy28lp_phy *miphy_phy) { void __iomem *base = miphy_phy->base; @@ -647,6 +676,9 @@ static inline int miphy28lp_configure_pcie(struct miphy28lp_phy *miphy_phy) if (err) return err; + if (miphy_phy->ssc) + miphy_pcie_tune_ssc(miphy_phy); + return 0; }