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Sat, 17 Aug 2024 15:06:59 +0000 From: "Wojciech Siudy (Nokia)" To: "linux-i2c@vger.kernel.org" CC: Andi Shyti Subject: [PATCH v2] pca954x: Reset if channel select fails Thread-Topic: [PATCH v2] pca954x: Reset if channel select fails Thread-Index: AQHa79MbyYnkGBOn7E2e85VmQT3fTw== Date: Sat, 17 Aug 2024 15:06:59 +0000 Message-ID: Accept-Language: pl-PL, en-US Content-Language: pl-PL X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nokia.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: DB6PR07MB3509:EE_|DBBPR07MB7435:EE_ x-ms-office365-filtering-correlation-id: bbb61bba-9464-471f-bcad-08dcbece3de4 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|376014|1800799024|366016|38070700018; x-microsoft-antispam-message-info: =?iso-8859-2?q?VZXiaKZGTPH61xC8HAW2fDmIR/?= =?iso-8859-2?q?G3P4URDMbJ5HrdqusXw9ruCL3Q2qtu5BmeiFNs82WLcbkmIZji0+f1pWRt61?= =?iso-8859-2?q?1XYHJCDpdH7kkucktHZ41t7Nmw1zViFlD1Hqcd6Id/+6A4exGB3I506ZKjdl?= =?iso-8859-2?q?GJCL+ofR/NVgTAHh3AVlEL/Id9QcNqStJwMrDE4URCSkF5PVx3EDRasIhFzk?= =?iso-8859-2?q?NrhYU56XU7tR766kUxUvgfTCO45Ol/1eJNlO8FNEAXWSWxzQdX9rP5Fha4FL?= =?iso-8859-2?q?30+fls5R5PJsd2BWEdfCHIgVsAwFknwd8ssun76yqUgCbm65kAapP3OlBOKf?= =?iso-8859-2?q?VwMiRaRJBk9Wgbt74pPrfEwXe+dJpwYoN2t0R80sTmGcPoN1XwSxYUBEy4uR?= =?iso-8859-2?q?4SN0naq56CmJMF+F/K2DrSU5EwjLnanze4k9MPMtqOiAXSrM/M2417PCcgW1?= =?iso-8859-2?q?mY6Ymh24UhuUXwdp/YcWMVYC+SF77e4PKhR8a2NnS8kMvw1RQA4BEib7NmlP?= =?iso-8859-2?q?I6Z9c2DlRi/bb9LLu9GbQu3AAbdq4x2Aw5ZIOONsk0dIeaTRRfQkB4CWnLXo?= =?iso-8859-2?q?sexK5G+b9UtmtI+6rvq91ylygIV1JukY3j2Jl+yylJYl6OJbsxxgIHPpMuWx?= =?iso-8859-2?q?+rPtr2COV2b4qcQE3Vo3cerlQv1Cznw3Dh6CprlJA9Q4Q9h8qnxbXp4Cfnsw?= =?iso-8859-2?q?7RpQKGMUv44xj511OZh6lSIHDrVokBsd1fmpdHr/YQfUy2L4aUEJhU8ChdKD?= =?iso-8859-2?q?C1oq0zBQY0WYJmkTz1jS12W5KhFToHwq9L//UxmUdM7w9bwvavinxTA06bQ8?= =?iso-8859-2?q?gLB4uggc8F30xB1lEBJ9nWGgMtmtRrvvxpLYIGrs/cM8JTyk9WwS0gr6arCx?= =?iso-8859-2?q?1wRo4JSUzl1bh5VVQhbCZpJsysFHp/q/c4qY0mDvNcQ29osPONX1jLzvAxMr?= =?iso-8859-2?q?yzp2dDSsz6GnqjEO1qo6QCQ0Idf+5oqlmysYwo/EwjZCuJwXHRJvG3CuRdz0?= =?iso-8859-2?q?z5+yt1xelEcNLHe8hlZyDFNG8SKGUYf7XNU8Fdh3f//ySxPbAOB701Kpc44R?= =?iso-8859-2?q?rRcz/eEmKhyRXsOzvOa/5cuX9CdeEEj3P+v9wWZcp11FlhXFKqzntthtXJDB?= =?iso-8859-2?q?1nVpLiVq87RIbU9VMNLI7L06IU7rBeIAhcyTjtpg2CWxapgvWxpoPPcQz+uw?= =?iso-8859-2?q?k0J8LJkzo8JLK+KG/n0Y0x3ixk3P7JlL/zjX2AYpZ8biMLQ9tBK5Y0vQwtPb?= =?iso-8859-2?q?tKW1hc2Weh+kwlywbZmfUzHszKHiWBNC2DgGta+7rlTpdoYjbncEDveb/+lV?= =?iso-8859-2?q?RMGktA28dYaqrfOrAKBAON4rEJBn/7H2FYij2Bx9ADY5xOoH2RSSAx0t+yV2?= =?iso-8859-2?q?mTUwFNeLyCCq140b9d9PEfkKurxXEO/6AFMLee7F7wXBqIMZ7bJqXeB2mvqK?= =?iso-8859-2?q?cd8LibOOvniMDdWPjF8k93dw=3D=3D?= x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DB6PR07MB3509.eurprd07.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(1800799024)(366016)(38070700018);DIR:OUT;SFP:1101; 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Without sending reset pulse the power-on-reset of entire device would be needed to restore the communication. The datasheet mentions 4 ns as a minimal hold time of reset pulse, but due to paths capacity and mux having its own clock it is better to have it about 1 us. Signed-off-by: Wojciech Siudy --- Changelog: v2: * Removed mail header from the commit log * Decreased reset pulse hold time from 10 to 1 us --- drivers/i2c/muxes/i2c-mux-pca954x.c | 30 +++++++++++++++++++++-------- 1 file changed, 22 insertions(+), 8 deletions(-) diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index 6f8401825..e09d4d107 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -316,6 +316,22 @@ static u8 pca954x_regval(struct pca954x *data, u8 chan) return 1 << chan; } +static void pca954x_reset_deassert(struct pca954x *data) +{ + if (data->reset_cont) + reset_control_deassert(data->reset_cont); + else + gpiod_set_value_cansleep(data->reset_gpio, 0); +} + +static void pca954x_reset_assert(struct pca954x *data) +{ + if (data->reset_cont) + reset_control_assert(data->reset_cont); + else + gpiod_set_value_cansleep(data->reset_gpio, 1); +} + static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan) { struct pca954x *data = i2c_mux_priv(muxc); @@ -329,6 +345,12 @@ static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan) ret = pca954x_reg_write(muxc->parent, client, regval); data->last_chan = ret < 0 ? 0 : regval; } + if (ret == -ETIMEDOUT && (data->reset_cont || data->reset_gpio)) { + dev_warn(&client->dev, "channel select failed, resetting...\n"); + pca954x_reset_assert(data); + udelay(1); + pca954x_reset_deassert(data); + } return ret; } @@ -543,14 +565,6 @@ static int pca954x_get_reset(struct device *dev, struct pca954x *data) return 0; } -static void pca954x_reset_deassert(struct pca954x *data) -{ - if (data->reset_cont) - reset_control_deassert(data->reset_cont); - else - gpiod_set_value_cansleep(data->reset_gpio, 0); -} - /* * I2C init/probing/exit functions */