Commit 6d1a19d3 authored by Frank Li's avatar Frank Li Committed by Alexandre Belloni
Browse files

i3c: master: svc: return actual transfer data len 



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

Reviewed-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: default avatarFrank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20231201222532.2431484-6-Frank.Li@nxp.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 6fb61734

drivers/i3c/master/svc-i3c-master.c

+8 −0
Original line number Diff line number Diff line
@@ -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;

};
@@ -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) {

		ret = -ENXIO;

		*actual_len = 0;

		goto emit_stop;

	}
@@ -1079,6 +1081,7 @@ 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;

	}
@@ -1174,6 +1177,10 @@ 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;

	}
@@ -1361,6 +1368,7 @@ 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;