kevin/linux
1
Fork 0
Code

i3c: master: svc: return actual transfer data len

Browse Source 
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>
This commit is contained in:
Frank Li 2023-12-01 17:25:31 -05:00 committed by Alexandre Belloni
parent 6fb61734a7
commit 6d1a19d34e
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/i3c/master/svc-i3c-master.c
View File

@ -138,6 +138,7 @@ struct svc_i3c_cmd {
const void *out; const void *out;
unsigned int len; unsigned int len;
unsigned int actual_len; unsigned int actual_len;
struct i3c_priv_xfer *xfer;
bool continued; bool continued;
}; };
@ -1062,6 +1063,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) { if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) {
ret = -ENXIO; ret = -ENXIO;
*actual_len = 0;
goto emit_stop; goto emit_stop;
} }
@ -1079,6 +1081,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
*/ */
if (SVC_I3C_MSTATUS_IBIWON(reg)) { if (SVC_I3C_MSTATUS_IBIWON(reg)) {
ret = -ENXIO; ret = -ENXIO;
*actual_len = 0;
goto emit_stop; goto emit_stop;
} }
@ -1174,6 +1177,10 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
cmd->addr, cmd->in, cmd->out, cmd->addr, cmd->in, cmd->out,
cmd->len, &cmd->actual_len, cmd->len, &cmd->actual_len,
cmd->continued); cmd->continued);
/* cmd->xfer is NULL if I2C or CCC transfer */
if (cmd->xfer)
cmd->xfer->actual_len = cmd->actual_len;
if (ret) if (ret)
break; break;
} }
@ -1361,6 +1368,7 @@ static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
for (i = 0; i < nxfers; i++) { for (i = 0; i < nxfers; i++) {
struct svc_i3c_cmd *cmd = &xfer->cmds[i]; struct svc_i3c_cmd *cmd = &xfer->cmds[i];
cmd->xfer = &xfers[i];
cmd->addr = master->addrs[data->index]; cmd->addr = master->addrs[data->index];
cmd->rnw = xfers[i].rnw; cmd->rnw = xfers[i].rnw;
cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL; cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL;