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Fri, 30 Nov 2018 07:23:47 +0000 Received: from DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd]) by DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd%2]) with mapi id 15.20.1361.019; Fri, 30 Nov 2018 07:23:47 +0000 From: Anson Huang To: "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , Fabio Estevam , "mturquette@baylibre.com" , "sboyd@kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-clk@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: dl-linux-imx Subject: [PATCH] clk: imx6sl: ensure MMDC CH0 handshake is bypassed Thread-Topic: [PATCH] clk: imx6sl: ensure MMDC CH0 handshake is bypassed Thread-Index: AQHUiH2hWlHF6oLZCESale1T/3ahbg== Date: Fri, 30 Nov 2018 07:23:47 +0000 Message-ID: <1543562288-28638-1-git-send-email-Anson.Huang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK0PR01CA0034.apcprd01.prod.exchangelabs.com (2603:1096:203:3e::22) To DB3PR0402MB3916.eurprd04.prod.outlook.com (2603:10a6:8:10::18) authentication-results: spf=none (sender IP is ) smtp.mailfrom=anson.huang@nxp.com; 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received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: 7CUYaiGAYY+/uAqetqUvKplM9Tq+eCvT9+/cpa900R32ErdZlv4t9GaD34LN1pyCcNT5WpF3lTJItkBfyhMPa8/Uu58ASFR5F/58F3gAr/0xaMxs3BFRlylsI2gYiVCqlSzK14pznlVJItS2mNbHfYUMNOvhZSdajjfRHgiKakuv3qgVfZqYG1I/NYj3IQLolYyytoLcUfTIstqChm9Nr9ZrvxiqDpHiF+rzv0Rlh/c4njxpSdEeF9PPuRzocF8CdFvNpkkQtyuXkzIKTRDoMiF9kfK4UU49EQY2su6wznIJKJizPt/0u7vYUP3IIH+iN/gfj/uF5vvANxvLYtLFVNmVl5oaUnDsKd5+SRWuKIE= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM 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: 289746cb-e7fd-41e1-acc8-08d65694c415 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Nov 2018 07:23:47.0501 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3PR0402MB3945 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Same as other i.MX6 SoCs, ensure unused MMDC channel's handshake is bypassed, this is to make sure no request signal will be generated when periphe_clk_sel is changed or SRC warm reset is triggered. Signed-off-by: Anson Huang --- drivers/clk/imx/clk-imx6sl.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/clk/imx/clk-imx6sl.c b/drivers/clk/imx/clk-imx6sl.c index 6fcfbbd..e13d881 100644 --- a/drivers/clk/imx/clk-imx6sl.c +++ b/drivers/clk/imx/clk-imx6sl.c @@ -17,6 +17,8 @@ =20 #include "clk.h" =20 +#define CCDR 0x4 +#define BM_CCM_CCDR_MMDC_CH0_MASK (1 << 17) #define CCSR 0xc #define BM_CCSR_PLL1_SW_CLK_SEL (1 << 2) #define CACRR 0x10 @@ -411,6 +413,10 @@ static void __init imx6sl_clocks_init(struct device_no= de *ccm_node) clks[IMX6SL_CLK_USDHC3] =3D imx_clk_gate2("usdhc3", "usdhc3_p= odf", base + 0x80, 6); clks[IMX6SL_CLK_USDHC4] =3D imx_clk_gate2("usdhc4", "usdhc4_p= odf", base + 0x80, 8); =20 + /* Ensure the MMDC CH0 handshake is bypassed */ + writel_relaxed(readl_relaxed(base + CCDR) | + BM_CCM_CCDR_MMDC_CH0_MASK, base + CCDR); + imx_check_clocks(clks, ARRAY_SIZE(clks)); =20 clk_data.clks =3D clks; --=20 2.7.4