[PATCH 11/19] drivers: mtd: nand: cadence: Poll for desc complete status

[dinesh.maniyam at intel.com]

From: Dinesh Maniyam <dinesh.maniyam at intel.com>

The patch is to poll for thread complete status to ensure the
descriptor processing is complete. If complete then can ensure
controller already update the descriptor status.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam at intel.com>
---
 drivers/mtd/nand/raw/cadence_nand.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mtd/nand/raw/cadence_nand.c b/drivers/mtd/nand/raw/cadence_nand.c
index 429a5e8017..33e8b79520 100644
--- a/drivers/mtd/nand/raw/cadence_nand.c
+++ b/drivers/mtd/nand/raw/cadence_nand.c
@@ -514,6 +514,7 @@ cadence_nand_cdma_send_and_wait(struct cadence_nand_info *cadence,
 {
 	struct cadence_nand_irq_status irq_mask, irq_status = {0};
 	int status;
+	u32 val;
 
 	irq_mask.trd_status = BIT(thread);
 	irq_mask.trd_error = BIT(thread);
@@ -525,6 +526,14 @@ cadence_nand_cdma_send_and_wait(struct cadence_nand_info *cadence,
 	if (status)
 		return status;
 
+	/* Make sure the descriptor processing is complete */
+	status = readl_poll_timeout(cadence->reg + TRD_COMP_INT_STATUS, val,
+				    (val & BIT(thread)), TIMEOUT_US);
+	if (status) {
+		pr_err("cmd thread completion timeout!\n");
+		return status;
+	}
+
 	cadence_nand_wait_for_irq(cadence, &irq_mask, &irq_status);
 
 	if (irq_status.status == 0 && irq_status.trd_status == 0 &&
-- 
2.26.2