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i3c: master: svc: return actual transfer data len

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[ Upstream commit 6d1a19d34e ]

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

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20231201222532.2431484-6-Frank.Li@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Stable-dep-of: 7f3d633b46 ("i3c: master: svc: change ENXIO to EAGAIN when IBI occurs during start frame")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Frank Li 2023-12-01 17:25:31 -05:00 committed by Greg Kroah-Hartman
parent 46fb7121fc
commit 3dc730aa1b
1 changed files with 8 additions and 0 deletions
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8
drivers/i3c/master/svc-i3c-master.c
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@ -135,6 +135,7 @@ struct svc_i3c_cmd {
const void *out;
unsigned int len;
unsigned int actual_len;
struct i3c_priv_xfer *xfer;
bool continued;
};
@ -1047,6 +1048,7 @@ 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;
}
@ -1064,6 +1066,7 @@ 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;
}
@ -1159,6 +1162,10 @@ 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);
/* cmd->xfer is NULL if I2C or CCC transfer */
if (cmd->xfer)
cmd->xfer->actual_len = cmd->actual_len;
if (ret)
break;
}
@ -1346,6 +1353,7 @@ 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;