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Tue, 21 Jan 2020 10:03:39 +0000 From: To: , , , CC: , , , Subject: [PATCH 15/15] power: reset: at91-reset: handle nrst async for sam9x60 Thread-Topic: [PATCH 15/15] power: reset: at91-reset: handle nrst async for sam9x60 Thread-Index: AQHV0EINUPsFdrOD60ihk98/gadShw== Date: Tue, 21 Jan 2020 10:03:39 +0000 Message-ID: <1579601001-5711-16-git-send-email-claudiu.beznea@microchip.com> References: <1579601001-5711-1-git-send-email-claudiu.beznea@microchip.com> In-Reply-To: <1579601001-5711-1-git-send-email-claudiu.beznea@microchip.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [94.177.32.156] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: cbcdb102-e729-47ce-17bc-08d79e59306f x-ms-traffictypediagnostic: DM6PR11MB3195: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:530; x-forefront-prvs: 0289B6431E x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(376002)(366004)(396003)(136003)(346002)(39860400002)(199004)(189003)(107886003)(26005)(186003)(36756003)(5660300002)(110136005)(54906003)(4326008)(66556008)(66476007)(6506007)(2906002)(76116006)(91956017)(6486002)(86362001)(64756008)(6512007)(66946007)(66446008)(8676002)(81156014)(2616005)(81166006)(8936002)(6636002)(71200400001)(316002)(478600001)(138113003); DIR:OUT; SFP:1101; SCL:1; SRVR:DM6PR11MB3195; H:DM6PR11MB3225.namprd11.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: microchip.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: cbcdb102-e729-47ce-17bc-08d79e59306f X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jan 2020 10:03:39.5540 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /MVJzzMJjKdLdxT96bEgdMeS5DsAyDRqsD4f3IErNarbqClc3F6Yd5dwTt9Y9LCwli05nJS8NuqbnvflWBtSfttWsF7CFTfZEl+ERziwo24= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB3195 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Handle NRST asynchronously for SAM9X60 to avoid problem with fast drop of VDDCORE on shutdown operations in the first 100 us after CPU is shutdown. Signed-off-by: Claudiu Beznea --- drivers/power/reset/at91-reset.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c index 537ccb180568..3ff9d93a5226 100644 --- a/drivers/power/reset/at91-reset.c +++ b/drivers/power/reset/at91-reset.c @@ -35,6 +35,7 @@ #define AT91_RSTC_MR 0x08 /* Reset Controller Mode Register */ #define AT91_RSTC_URSTEN BIT(0) /* User Reset Enable */ +#define AT91_RSTC_URSTASYNC BIT(2) /* User Reset Asynchronous Control */ #define AT91_RSTC_URSTIEN BIT(4) /* User Reset Interrupt Enable */ #define AT91_RSTC_ERSTL GENMASK(11, 8) /* External Reset Length */ @@ -228,6 +229,13 @@ static int __init at91_reset_probe(struct platform_device *pdev) platform_set_drvdata(pdev, reset); + if (of_device_is_compatible(pdev->dev.of_node, "microchip,sam9x60-rstc")) { + u32 val = readl(reset->rstc_base + AT91_RSTC_MR); + + writel(AT91_RSTC_KEY | AT91_RSTC_URSTASYNC | val, + reset->rstc_base + AT91_RSTC_MR); + } + ret = register_restart_handler(&reset->nb); if (ret) { clk_disable_unprepare(reset->sclk);