linux-kernel - [PATCH] spi: cadence-quadspi: fix protocol setup for non-1-1-X operations

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Message-Id: <20220331110819.133392-1-matthias.schiffer@ew.tq-group.com>
Date:   Thu, 31 Mar 2022 13:08:19 +0200
From:   Matthias Schiffer <matthias.schiffer@...tq-group.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Ramuthevar Vadivel Murugan 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: [PATCH] spi: cadence-quadspi: fix protocol setup for non-1-1-X operations

cqspi_set_protocol() only set the data width, but ignored the command
and address width (except for 8-8-8 DTR ops), leading to corruption of
all transfers using 1-X-X or X-X-X ops. Fix by setting the other two
widths as well.

While we're at it, simplify the code a bit by replacing the
CQSPI_INST_TYPE_* constants with ilog2().

Tested on a TI AM64x with a Macronix MX25U51245G QSPI flash with 1-4-4
read and write operations.

Fixes: a314f6367787 ("mtd: spi-nor: Convert cadence-quadspi to use spi-mem framework")
Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
---
 drivers/spi/spi-cadence-quadspi.c | 46 ++++++++-----------------------
 1 file changed, 12 insertions(+), 34 deletions(-)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index b0c9f62ccefb..616ada891974 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -19,6 +19,7 @@
 #include <linux/iopoll.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
+#include <linux/log2.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of.h>
@@ -102,12 +103,6 @@ struct cqspi_driver_platdata {
 #define CQSPI_TIMEOUT_MS			500
 #define CQSPI_READ_TIMEOUT_MS			10
 
-/* Instruction type */
-#define CQSPI_INST_TYPE_SINGLE			0
-#define CQSPI_INST_TYPE_DUAL			1
-#define CQSPI_INST_TYPE_QUAD			2
-#define CQSPI_INST_TYPE_OCTAL			3
-
 #define CQSPI_DUMMY_CLKS_PER_BYTE		8
 #define CQSPI_DUMMY_BYTES_MAX			4
 #define CQSPI_DUMMY_CLKS_MAX			31
@@ -376,10 +371,6 @@ static unsigned int cqspi_calc_dummy(const struct spi_mem_op *op, bool dtr)
 static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata,
 			      const struct spi_mem_op *op)
 {
-	f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE;
-	f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE;
-	f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
-
 	/*
 	 * For an op to be DTR, cmd phase along with every other non-empty
 	 * phase should have dtr field set to 1. If an op phase has zero
@@ -389,32 +380,23 @@ static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata,
 		       (!op->addr.nbytes || op->addr.dtr) &&
 		       (!op->data.nbytes || op->data.dtr);
 
-	switch (op->data.buswidth) {
-	case 0:
-		break;
-	case 1:
-		f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
-		break;
-	case 2:
-		f_pdata->data_width = CQSPI_INST_TYPE_DUAL;
-		break;
-	case 4:
-		f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
-		break;
-	case 8:
-		f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
-		break;
-	default:
-		return -EINVAL;
-	}
+	f_pdata->inst_width = 0;
+	if (op->cmd.buswidth)
+		f_pdata->inst_width = ilog2(op->cmd.buswidth);
+
+	f_pdata->addr_width = 0;
+	if (op->addr.buswidth)
+		f_pdata->addr_width = ilog2(op->addr.buswidth);
+
+	f_pdata->data_width = 0;
+	if (op->data.buswidth)
+		f_pdata->data_width = ilog2(op->data.buswidth);
 
 	/* Right now we only support 8-8-8 DTR mode. */
 	if (f_pdata->dtr) {
 		switch (op->cmd.buswidth) {
 		case 0:
-			break;
 		case 8:
-			f_pdata->inst_width = CQSPI_INST_TYPE_OCTAL;
 			break;
 		default:
 			return -EINVAL;
@@ -422,9 +404,7 @@ static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata,
 
 		switch (op->addr.buswidth) {
 		case 0:
-			break;
 		case 8:
-			f_pdata->addr_width = CQSPI_INST_TYPE_OCTAL;
 			break;
 		default:
 			return -EINVAL;
@@ -432,9 +412,7 @@ static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata,
 
 		switch (op->data.buswidth) {
 		case 0:
-			break;
 		case 8:
-			f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
 			break;
 		default:
 			return -EINVAL;
-- 
2.25.1