linux-kernel - [PATCH] spi: fsi: Increase timeout and ensure status is checked

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Date:   Thu, 23 Jun 2022 09:05:47 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-spi@...r.kernel.org
Cc:     broonie@...nel.org, linux-kernel@...r.kernel.org,
        Eddie James <eajames@...ux.ibm.com>
Subject: [PATCH] spi: fsi: Increase timeout and ensure status is checked

Only timeout after at least one iteration of checking the
status registers. In addition, increase the transfer timeout
to 1 second.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/spi/spi-fsi.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-fsi.c b/drivers/spi/spi-fsi.c
index 72ab066ce552..cf1e4f9ebd72 100644
--- a/drivers/spi/spi-fsi.c
+++ b/drivers/spi/spi-fsi.c
@@ -24,8 +24,7 @@
 #define FSI2SPI_IRQ			0x20
 
 #define SPI_FSI_BASE			0x70000
-#define SPI_FSI_INIT_TIMEOUT_MS		1000
-#define SPI_FSI_STATUS_TIMEOUT_MS	100
+#define SPI_FSI_TIMEOUT_MS		1000
 #define SPI_FSI_MAX_RX_SIZE		8
 #define SPI_FSI_MAX_TX_SIZE		40
 
@@ -299,6 +298,7 @@ static void fsi_spi_sequence_init(struct fsi_spi_sequence *seq)
 static int fsi_spi_transfer_data(struct fsi_spi *ctx,
 				 struct spi_transfer *transfer)
 {
+	int loops;
 	int rc = 0;
 	unsigned long end;
 	u64 status = 0ULL;
@@ -317,9 +317,10 @@ static int fsi_spi_transfer_data(struct fsi_spi *ctx,
 			if (rc)
 				return rc;
 
-			end = jiffies + msecs_to_jiffies(SPI_FSI_STATUS_TIMEOUT_MS);
+			loops = 0;
+			end = jiffies + msecs_to_jiffies(SPI_FSI_TIMEOUT_MS);
 			do {
-				if (time_after(jiffies, end))
+				if (loops++ && time_after(jiffies, end))
 					return -ETIMEDOUT;
 
 				rc = fsi_spi_status(ctx, &status, "TX");
@@ -335,9 +336,10 @@ static int fsi_spi_transfer_data(struct fsi_spi *ctx,
 		u8 *rx = transfer->rx_buf;
 
 		while (transfer->len > recv) {
-			end = jiffies + msecs_to_jiffies(SPI_FSI_STATUS_TIMEOUT_MS);
+			loops = 0;
+			end = jiffies + msecs_to_jiffies(SPI_FSI_TIMEOUT_MS);
 			do {
-				if (time_after(jiffies, end))
+				if (loops++ && time_after(jiffies, end))
 					return -ETIMEDOUT;
 
 				rc = fsi_spi_status(ctx, &status, "RX");
@@ -359,6 +361,7 @@ static int fsi_spi_transfer_data(struct fsi_spi *ctx,
 
 static int fsi_spi_transfer_init(struct fsi_spi *ctx)
 {
+	int loops = 0;
 	int rc;
 	bool reset = false;
 	unsigned long end;
@@ -369,9 +372,9 @@ static int fsi_spi_transfer_init(struct fsi_spi *ctx)
 		SPI_FSI_CLOCK_CFG_SCK_NO_DEL |
 		FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, 19);
 
-	end = jiffies + msecs_to_jiffies(SPI_FSI_INIT_TIMEOUT_MS);
+	end = jiffies + msecs_to_jiffies(SPI_FSI_TIMEOUT_MS);
 	do {
-		if (time_after(jiffies, end))
+		if (loops++ && time_after(jiffies, end))
 			return -ETIMEDOUT;
 
 		rc = fsi_spi_read_reg(ctx, SPI_FSI_STATUS, &status);
-- 
2.31.1