diff options
| -rw-r--r-- | drivers/i3c/master/svc-i3c-master.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 63063741fbd1..57d63d299e1e 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -655,6 +655,15 @@ static void svc_i3c_master_ibi_isr(struct svc_i3c_master *master) break; case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: svc_i3c_master_emit_stop(master); + + /* + * If a target gets stuck holding SDA low, the controller reports a MR. + * On NPCM845, emitting STOP may spuriously set SLVSTART, retriggering + * the interrupt and re-entering MR handling, leading to an IRQ storm. + * Clear SLVSTART after STOP to break the loop. + */ + if (svc_has_quirk(master, SVC_I3C_QUIRK_FALSE_SLVSTART)) + writel(SVC_I3C_MINT_SLVSTART, master->regs + SVC_I3C_MSTATUS); break; default: break; |