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| author | Frank Li <Frank.Li@nxp.com> | 2024-10-02 10:50:34 -0400 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2024-10-31 23:53:39 +0100 |
| commit | e22405a812a11e5b01bfbb18c5277dd3e69ba589 (patch) | |
| tree | 2dcf37a2561ca8c6859248180d425b06c6d6b0c7 /drivers/i3c | |
| parent | 3c6684a15010822a83f312d6b9d4714c36f0f7e2 (diff) | |
| download | lwn-e22405a812a11e5b01bfbb18c5277dd3e69ba589.tar.gz lwn-e22405a812a11e5b01bfbb18c5277dd3e69ba589.zip | |
i3c: master: svc: manually emit NACK/ACK for hotjoin
When the address is arbitrated at send address, the hardware can auto-send
NACK if it is an IBI. However, manual emission of NACK/ACK is needed for
hot join or controller request events.
Add help function svc_i3c_master_handle_ibi_won() to check event type and
send out NACK if the event is not an IBI.
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20241002-svc-i3c-hj-v6-2-7e6e1d3569ae@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/master/svc-i3c-master.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 7cd3ce2643f1..c35a228f0c2f 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -409,6 +409,24 @@ static void svc_i3c_master_nack_ibi(struct svc_i3c_master *master) master->regs + SVC_I3C_MCTRL); } +static int svc_i3c_master_handle_ibi_won(struct svc_i3c_master *master, u32 mstatus) +{ + u32 ibitype; + + ibitype = SVC_I3C_MSTATUS_IBITYPE(mstatus); + + writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + + /* Hardware can't auto emit NACK for hot join and master request */ + switch (ibitype) { + case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: + case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: + svc_i3c_master_nack_ibi(master); + } + + return 0; +} + static void svc_i3c_master_ibi_work(struct work_struct *work) { struct svc_i3c_master *master = container_of(work, struct svc_i3c_master, ibi_work); @@ -1177,7 +1195,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master, * start. */ if (SVC_I3C_MSTATUS_IBIWON(reg)) { - writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + svc_i3c_master_handle_ibi_won(master, reg); continue; } |