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i3c: master: svc: manually emit NACK/ACK for hotjoin

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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>
This commit is contained in:
Frank Li 2024-10-02 10:50:34 -04:00 committed by Alexandre Belloni
parent 3c6684a150
commit e22405a812
1 changed files with 19 additions and 1 deletions
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20
drivers/i3c/master/svc-i3c-master.c
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@ -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;
}