diff mbox series

[3/5] i3c: svc: rename read_len as actual_len

Message ID 20231016154632.2851957-4-Frank.Li@nxp.com (mailing list archive)
State Superseded
Headers show
Series i3c: master: some improvment for i3c master | expand

Commit Message

Frank Li Oct. 16, 2023, 3:46 p.m. UTC 
I3C transfer, target can early terminate transfer.
I2C transfer, target can NACK write transfer.

'actual_len' is better name than 'read_len'.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/i3c/master/svc-i3c-master.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

Comments

Miquel Raynal Oct. 17, 2023, 2:07 p.m. UTC | #1 
Hi Frank,

Frank.Li@nxp.com wrote on Mon, 16 Oct 2023 11:46:30 -0400:

> I3C transfer, target can early terminate transfer.
> I2C transfer, target can NACK write transfer.
> 
> 'actual_len' is better name than 'read_len'.

I don't find read_len confusing because it may mean "how much bytes
were actually read" rather than "how much we need to read". But if
actual_len sounds better, I'm fine.

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>

Thanks,
Miquèl
Frank Li Oct. 17, 2023, 8:43 p.m. UTC | #2 
On Tue, Oct 17, 2023 at 04:07:29PM +0200, Miquel Raynal wrote:
> Hi Frank,
> 
> Frank.Li@nxp.com wrote on Mon, 16 Oct 2023 11:46:30 -0400:
> 
> > I3C transfer, target can early terminate transfer.
> > I2C transfer, target can NACK write transfer.
> > 
> > 'actual_len' is better name than 'read_len'.
> 
> I don't find read_len confusing because it may mean "how much bytes
> were actually read" rather than "how much we need to read". But if
> actual_len sounds better, I'm fine.

Another reason: According to i3c spec. 5.2.2.3.6 line 6090.
Target ends or continues the write transfer.

in HDR mode, target can end write transfer. So use 'actual_len'

Do you think I need add it to commit message

Frank

> 
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
> 
> > 
> > Signed-off-by: Frank Li <Frank.Li@nxp.com>
> 
> Thanks,
> Miquèl
diff mbox series

Patch

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index f0d99b029e5f..3570b709cf60 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -137,7 +137,7 @@  struct svc_i3c_cmd {
 	u8 *in;
 	const void *out;
 	unsigned int len;
-	unsigned int read_len;
+	unsigned int actual_len;
 	bool continued;
 };
 
@@ -1022,7 +1022,7 @@  static int svc_i3c_master_write(struct svc_i3c_master *master,
 static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 			       bool rnw, unsigned int xfer_type, u8 addr,
 			       u8 *in, const u8 *out, unsigned int xfer_len,
-			       unsigned int *read_len, bool continued)
+			       unsigned int *actual_len, bool continued)
 {
 	u32 reg;
 	int ret;
@@ -1035,7 +1035,7 @@  static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 	       SVC_I3C_MCTRL_IBIRESP_NACK |
 	       SVC_I3C_MCTRL_DIR(rnw) |
 	       SVC_I3C_MCTRL_ADDR(addr) |
-	       SVC_I3C_MCTRL_RDTERM(*read_len),
+	       SVC_I3C_MCTRL_RDTERM(*actual_len),
 	       master->regs + SVC_I3C_MCTRL);
 
 	ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
@@ -1073,7 +1073,7 @@  static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 		goto emit_stop;
 
 	if (rnw)
-		*read_len = ret;
+		*actual_len = ret;
 
 	ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
 				 SVC_I3C_MSTATUS_COMPLETE(reg), 0, 1000);
@@ -1155,7 +1155,7 @@  static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
 
 		ret = svc_i3c_master_xfer(master, cmd->rnw, xfer->type,
 					  cmd->addr, cmd->in, cmd->out,
-					  cmd->len, &cmd->read_len,
+					  cmd->len, &cmd->actual_len,
 					  cmd->continued);
 		if (ret)
 			break;
@@ -1241,7 +1241,7 @@  static int svc_i3c_master_send_bdcast_ccc_cmd(struct svc_i3c_master *master,
 	cmd->in = NULL;
 	cmd->out = buf;
 	cmd->len = xfer_len;
-	cmd->read_len = 0;
+	cmd->actual_len = 0;
 	cmd->continued = false;
 
 	mutex_lock(&master->lock);
@@ -1261,7 +1261,7 @@  static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 					      struct i3c_ccc_cmd *ccc)
 {
 	unsigned int xfer_len = ccc->dests[0].payload.len;
-	unsigned int read_len = ccc->rnw ? xfer_len : 0;
+	unsigned int actual_len = ccc->rnw ? xfer_len : 0;
 	struct svc_i3c_xfer *xfer;
 	struct svc_i3c_cmd *cmd;
 	int ret;
@@ -1279,7 +1279,7 @@  static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 	cmd->in = NULL;
 	cmd->out = &ccc->id;
 	cmd->len = 1;
-	cmd->read_len = 0;
+	cmd->actual_len = 0;
 	cmd->continued = true;
 
 	/* Directed message */
@@ -1289,7 +1289,7 @@  static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 	cmd->in = ccc->rnw ? ccc->dests[0].payload.data : NULL;
 	cmd->out = ccc->rnw ? NULL : ccc->dests[0].payload.data,
 	cmd->len = xfer_len;
-	cmd->read_len = read_len;
+	cmd->actual_len = actual_len;
 	cmd->continued = false;
 
 	mutex_lock(&master->lock);
@@ -1298,8 +1298,8 @@  static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 		svc_i3c_master_dequeue_xfer(master, xfer);
 	mutex_unlock(&master->lock);
 
-	if (cmd->read_len != xfer_len)
-		ccc->dests[0].payload.len = cmd->read_len;
+	if (cmd->actual_len != xfer_len)
+		ccc->dests[0].payload.len = cmd->actual_len;
 
 	ret = xfer->ret;
 	svc_i3c_master_free_xfer(xfer);
@@ -1349,7 +1349,7 @@  static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
 		cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL;
 		cmd->out = xfers[i].rnw ? NULL : xfers[i].data.out;
 		cmd->len = xfers[i].len;
-		cmd->read_len = xfers[i].rnw ? xfers[i].len : 0;
+		cmd->actual_len = xfers[i].rnw ? xfers[i].len : 0;
 		cmd->continued = (i + 1) < nxfers;
 	}
 
@@ -1389,7 +1389,7 @@  static int svc_i3c_master_i2c_xfers(struct i2c_dev_desc *dev,
 		cmd->in = cmd->rnw ? xfers[i].buf : NULL;
 		cmd->out = cmd->rnw ? NULL : xfers[i].buf;
 		cmd->len = xfers[i].len;
-		cmd->read_len = cmd->rnw ? xfers[i].len : 0;
+		cmd->actual_len = cmd->rnw ? xfers[i].len : 0;
 		cmd->continued = (i + 1 < nxfers);
 	}