i3c: mipi-i3c-hci: Consolidate common xfer processing logic

Several parts of the MIPI I3C HCI driver duplicate the same sequence for
queuing a transfer, waiting for completion, and handling timeouts. This
logic appears in five separate locations and will be affected by an
upcoming fix.

Refactor the repeated code into a new helper, i3c_hci_process_xfer(), and
store the timeout value in the hci_xfer structure so that callers do not
need to pass it as a separate parameter.

Fixes: 9ad9a52 ("i3c/master: introduce the mipi-i3c-hci driver")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260306072451.11131-12-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: ahunter6

drivers/i3c/master/mipi-i3c-hci/cmd_v1.c

@@ -331,12 +331,10 @@ static int hci_cmd_v1_daa(struct i3c_hci *hci)
 			CMD_A0_ROC | CMD_A0_TOC;
 		xfer->cmd_desc[1] = 0;
 		xfer->completion = &done;
-		hci->io->queue_xfer(hci, xfer, 1);
-		if (!wait_for_completion_timeout(&done, HZ) &&
-		    hci->io->dequeue_xfer(hci, xfer, 1)) {
-			ret = -ETIMEDOUT;
+		xfer->timeout = HZ;
+		ret = i3c_hci_process_xfer(hci, xfer, 1);
+		if (ret)
 			break;
-		}
 		if ((RESP_STATUS(xfer->response) == RESP_ERR_ADDR_HEADER ||
 		     RESP_STATUS(xfer->response) == RESP_ERR_NACK) &&
 		    RESP_DATA_LENGTH(xfer->response) == 1) {

drivers/i3c/master/mipi-i3c-hci/cmd_v2.c

@@ -253,6 +253,7 @@ static int hci_cmd_v2_daa(struct i3c_hci *hci)
 	xfer[0].rnw = true;
 	xfer[0].cmd_desc[1] = CMD_A1_DATA_LENGTH(8);
 	xfer[1].completion = &done;
+	xfer[1].timeout = HZ;
 
 	for (;;) {
 		ret = i3c_master_get_free_addr(&hci->master, next_addr);
@@ -272,12 +273,9 @@ static int hci_cmd_v2_daa(struct i3c_hci *hci)
 			CMD_A0_ASSIGN_ADDRESS(next_addr) |
 			CMD_A0_ROC |
 			CMD_A0_TOC;
-		hci->io->queue_xfer(hci, xfer, 2);
-		if (!wait_for_completion_timeout(&done, HZ) &&
-		    hci->io->dequeue_xfer(hci, xfer, 2)) {
-			ret = -ETIMEDOUT;
+		ret = i3c_hci_process_xfer(hci, xfer, 2);
+		if (ret)
 			break;
-		}
 		if (RESP_STATUS(xfer[0].response) != RESP_SUCCESS) {
 			ret = 0;  /* no more devices to be assigned */
 			break;

drivers/i3c/master/mipi-i3c-hci/core.c

@@ -213,6 +213,25 @@ void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci)
 	reg_write(DCT_SECTION, FIELD_PREP(DCT_TABLE_INDEX, 0));
 }
 
+int i3c_hci_process_xfer(struct i3c_hci *hci, struct hci_xfer *xfer, int n)
+{
+	struct completion *done = xfer[n - 1].completion;
+	unsigned long timeout = xfer[n - 1].timeout;
+	int ret;
+
+	ret = hci->io->queue_xfer(hci, xfer, n);
+	if (ret)
+		return ret;
+
+	if (!wait_for_completion_timeout(done, timeout) &&
+	    hci->io->dequeue_xfer(hci, xfer, n)) {
+		dev_err(&hci->master.dev, "%s: timeout error\n", __func__);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
 static int i3c_hci_send_ccc_cmd(struct i3c_master_controller *m,
 				struct i3c_ccc_cmd *ccc)
 {
@@ -253,18 +272,14 @@ static int i3c_hci_send_ccc_cmd(struct i3c_master_controller *m,
 	last = i - 1;
 	xfer[last].cmd_desc[0] |= CMD_0_TOC;
 	xfer[last].completion = &done;
+	xfer[last].timeout = HZ;
 
 	if (prefixed)
 		xfer--;
 
-	ret = hci->io->queue_xfer(hci, xfer, nxfers);
+	ret = i3c_hci_process_xfer(hci, xfer, nxfers);
 	if (ret)
 		goto out;
-	if (!wait_for_completion_timeout(&done, HZ) &&
-	    hci->io->dequeue_xfer(hci, xfer, nxfers)) {
-		ret = -ETIMEDOUT;
-		goto out;
-	}
 	for (i = prefixed; i < nxfers; i++) {
 		if (ccc->rnw)
 			ccc->dests[i - prefixed].payload.len =
@@ -335,15 +350,11 @@ static int i3c_hci_i3c_xfers(struct i3c_dev_desc *dev,
 	last = i - 1;
 	xfer[last].cmd_desc[0] |= CMD_0_TOC;
 	xfer[last].completion = &done;
+	xfer[last].timeout = HZ;
 
-	ret = hci->io->queue_xfer(hci, xfer, nxfers);
+	ret = i3c_hci_process_xfer(hci, xfer, nxfers);
 	if (ret)
 		goto out;
-	if (!wait_for_completion_timeout(&done, HZ) &&
-	    hci->io->dequeue_xfer(hci, xfer, nxfers)) {
-		ret = -ETIMEDOUT;
-		goto out;
-	}
 	for (i = 0; i < nxfers; i++) {
 		if (i3c_xfers[i].rnw)
 			i3c_xfers[i].len = RESP_DATA_LENGTH(xfer[i].response);
@@ -383,15 +394,11 @@ static int i3c_hci_i2c_xfers(struct i2c_dev_desc *dev,
 	last = i - 1;
 	xfer[last].cmd_desc[0] |= CMD_0_TOC;
 	xfer[last].completion = &done;
+	xfer[last].timeout = m->i2c.timeout;
 
-	ret = hci->io->queue_xfer(hci, xfer, nxfers);
+	ret = i3c_hci_process_xfer(hci, xfer, nxfers);
 	if (ret)
 		goto out;
-	if (!wait_for_completion_timeout(&done, m->i2c.timeout) &&
-	    hci->io->dequeue_xfer(hci, xfer, nxfers)) {
-		ret = -ETIMEDOUT;
-		goto out;
-	}
 	for (i = 0; i < nxfers; i++) {
 		if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) {
 			ret = -EIO;

drivers/i3c/master/mipi-i3c-hci/hci.h

@@ -89,6 +89,7 @@ struct hci_xfer {
 	unsigned int data_len;
 	unsigned int cmd_tid;
 	struct completion *completion;
+	unsigned long timeout;
 	union {
 		struct {
 			/* PIO specific */
@@ -156,5 +157,6 @@ void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci);
 void amd_set_od_pp_timing(struct i3c_hci *hci);
 void amd_set_resp_buf_thld(struct i3c_hci *hci);
 void i3c_hci_sync_irq_inactive(struct i3c_hci *hci);
+int i3c_hci_process_xfer(struct i3c_hci *hci, struct hci_xfer *xfer, int n);
 
 #endif