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Date: Wed, 29 Mar 2017 12:43:23 -0500 From: Christopher Bostic <cbostic@...ux.vnet.ibm.com> To: robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk, rostedt@...dmis.org, mingo@...hat.com, gregkh@...uxfoundation.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Cc: Chris Bostic <cbostic@...ux.vnet.ibm.com>, joel@....id.au, linux-kernel@...r.kernel.org, andrew@...id.au, alistair@...ple.id.au, benh@...nel.crashing.org Subject: [PATCH v4 06/23] drivers/fsi: Set up links for slave communication From: Chris Bostic <cbostic@...ux.vnet.ibm.com> Enable each link and send a break command, and try to detect a slave by reading from the SMODE register. Signed-off-by: Chris Bostic <cbostic@...ux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@....id.au> --- drivers/fsi/fsi-core.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 32698ed..6e1cfdf 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -157,12 +157,45 @@ static int fsi_master_write(struct fsi_master *master, int link, return master->write(master, link, slave_id, addr, val, size); } +static int fsi_master_link_enable(struct fsi_master *master, int link) +{ + if (master->link_enable) + return master->link_enable(master, link); + + return 0; +} + +/* + * Issue a break command on this link + */ +static int fsi_master_break(struct fsi_master *master, int link) +{ + if (master->send_break) + return master->send_break(master, link); + + return 0; +} + static int fsi_master_scan(struct fsi_master *master) { - int link; + int link, rc; + + for (link = 0; link < master->n_links; link++) { + rc = fsi_master_link_enable(master, link); + if (rc) { + dev_dbg(&master->dev, + "enable link %d failed: %d\n", link, rc); + continue; + } + rc = fsi_master_break(master, link); + if (rc) { + dev_dbg(&master->dev, + "break to link %d failed: %d\n", link, rc); + continue; + } - for (link = 0; link < master->n_links; link++) fsi_slave_init(master, link, 0); + } return 0; } -- 1.8.2.2
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