[PATCH 4/5] i3c: master: svc return actual transfer data len

Frank Li
2023-10-16T15:47:05Z

I3C allow devices early terminate data transfer. So set "actual" to
indicate how much data get by i3c_priv_xfer.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
drivers/i3c/master/svc-i3c-master.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 3570b709cf60..444825aafa6f 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -138,6 +138,7 @@ struct svc_i3c_cmd {
const void *out;
unsigned int len;
unsigned int actual_len;
+ struct i3c_priv_xfer *xfer;
bool continued;
};

@@ -1045,6 +1046,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,

if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) {
ret = -ENXIO;
+ *actual_len = 0;
goto emit_stop;
}

@@ -1062,6 +1064,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
*/
if (SVC_I3C_MSTATUS_IBIWON(reg)) {
ret = -ENXIO;
+ *actual_len = 0;
goto emit_stop;
}

@@ -1157,6 +1160,9 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
cmd->addr, cmd->in, cmd->out,
cmd->len, &cmd->actual_len,
cmd->continued);
+ if (cmd->xfer)
+ cmd->xfer->actual = cmd->actual_len;
+
if (ret)
break;
}
@@ -1344,6 +1350,7 @@ static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
for (i = 0; i < nxfers; i++) {
struct svc_i3c_cmd *cmd = &xfer->cmds[i];

+ cmd->xfer = xfers + i;
cmd->addr = master->addrs[data->index];
cmd->rnw = xfers[i].rnw;
cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL;
--
2.34.1