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charset="utf-8" Add NACK check after start byte is sent. It is possible to detect early that a device is not on the bus and avoid invalid transmissions thereafter. Signed-off-by: Clark Wang Reviewed-by: Miquel Raynal --- drivers/i3c/master/svc-i3c-master.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index 4edf33ed207d..0d63b732ef0c 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -92,6 +92,7 @@ #define SVC_I3C_MINTCLR 0x094 #define SVC_I3C_MINTMASKED 0x098 #define SVC_I3C_MERRWARN 0x09C +#define SVC_I3C_MERRWARN_NACK BIT(2) #define SVC_I3C_MDMACTRL 0x0A0 #define SVC_I3C_MDATACTRL 0x0AC #define SVC_I3C_MDATACTRL_FLUSHTB BIT(0) @@ -1014,6 +1015,11 @@ static int svc_i3c_master_xfer(struct svc_i3c_master= *master, if (ret) goto emit_stop; =20 + if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) { + ret =3D -ENXIO; + goto emit_stop; + } + if (rnw) ret =3D svc_i3c_master_read(master, in, xfer_len); else --=20 2.34.1