Message ID | 20190310135843.21154-3-pgaj@cadence.com (mailing list archive) |
---|---|
State | Superseded |
Headers | show
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Sun, 10 Mar 2019 14:59:10 +0100 Received: from lvlogina.cadence.com (localhost.localdomain [127.0.0.1]) by lvlogina.cadence.com (8.14.4/8.14.4) with ESMTP id x2ADx9P4022549; Sun, 10 Mar 2019 13:59:09 GMT Received: (from pgaj@localhost) by lvlogina.cadence.com (8.14.4/8.14.4/Submit) id x2ADx9sD022545; Sun, 10 Mar 2019 13:59:09 GMT From: Przemyslaw Gaj <pgaj@cadence.com> To: <bbrezillon@kernel.org> Subject: [PATCH v4 2/6] i3c: export bus maintenance lock and unlock functions Date: Sun, 10 Mar 2019 13:58:39 +0000 Message-ID: <20190310135843.21154-3-pgaj@cadence.com> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20190310135843.21154-1-pgaj@cadence.com> References: <20190310135843.21154-1-pgaj@cadence.com> MIME-Version: 1.0 X-OrganizationHeadersPreserved: maileu3.global.cadence.com X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:158.140.1.28; IPV:CAL; SCL:-1; CTRY:US; EFV:NLI; SFV:NSPM; SFS:(10009020)(346002)(376002)(396003)(39860400002)(136003)(2980300002)(189003)(199004)(36092001)(2906002)(246002)(106466001)(6916009)(105596002)(316002)(86362001)(16586007)(42186006)(54906003)(305945005)(107886003)(8936002)(7636002)(336012)(51416003)(76176011)(5660300002)(126002)(26005)(486006)(1076003)(2351001)(186003)(2616005)(87636003)(426003)(11346002)(476003)(14444005)(47776003)(4326008)(50226002)(6666004)(356004)(446003)(26826003)(478600001)(50466002)(48376002)(8676002)(36756003); 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Add the I3C mastership request
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diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 5b3adb3..aea4309 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -38,10 +38,11 @@ static DEFINE_MUTEX(i3c_core_lock); * logic to rely on I3C device information that could be changed behind their * back. */ -static void i3c_bus_maintenance_lock(struct i3c_bus *bus) +void i3c_bus_maintenance_lock(struct i3c_bus *bus) { down_write(&bus->lock); } +EXPORT_SYMBOL_GPL(i3c_bus_maintenance_lock); /** * i3c_bus_maintenance_unlock - Release the bus lock after a maintenance @@ -52,10 +53,11 @@ static void i3c_bus_maintenance_lock(struct i3c_bus *bus) * i3c_bus_maintenance_lock() for more details on what these maintenance * operations are. */ -static void i3c_bus_maintenance_unlock(struct i3c_bus *bus) +void i3c_bus_maintenance_unlock(struct i3c_bus *bus) { up_write(&bus->lock); } +EXPORT_SYMBOL_GPL(i3c_bus_maintenance_unlock); /** * i3c_bus_normaluse_lock - Lock the bus for a normal operation diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index 3c27d9f..42bb215 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -647,4 +647,7 @@ void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot); struct i3c_ibi_slot *i3c_master_get_free_ibi_slot(struct i3c_dev_desc *dev); +void i3c_bus_maintenance_lock(struct i3c_bus *bus); +void i3c_bus_maintenance_unlock(struct i3c_bus *bus); + #endif /* I3C_MASTER_H */
Secondary master driver has to gather device information using GETPID/GETBCR and GETDCR. Mostly GETPID, DEFSLVS command does not provide device PID. Because devices are registered from master controller driver, it has to lock the bus for maintenance. Signed-off-by: Przemyslaw Gaj <pgaj@cadence.com> --- drivers/i3c/master.c | 6 ++++-- include/linux/i3c/master.h | 3 +++ 2 files changed, 7 insertions(+), 2 deletions(-)