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Message-ID: <20250905185958.3575037-4-s-k6@ti.com>
Date: Sat, 6 Sep 2025 00:29:57 +0530
From: Santhosh Kumar K <s-k6@...com>
To: <miquel.raynal@...tlin.com>, <broonie@...nel.org>, <vigneshr@...com>,
<marex@...x.de>, <computersforpeace@...il.com>,
<theo.lebrun@...tlin.com>
CC: <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <s-k6@...com>,
<praneeth@...com>, <p-mantena@...com>, <a-dutta@...com>,
<u-kumar1@...com>, <stable@...r.kernel.org>,
Pratyush Yadav
<pratyush@...nel.org>
Subject: [PATCH v2 3/4] spi: cadence-quadspi: Fix cqspi_setup_flash()
The 'max_cs' stores the largest chip select number. It should only
be updated when the current 'cs' is greater than existing 'max_cs'. So,
fix the condition accordingly.
Also, return failure if there are no flash device declared.
Fixes: 0f3841a5e115 ("spi: cadence-qspi: report correct number of chip-select")
CC: stable@...r.kernel.org
Reviewed-by: Pratyush Yadav <pratyush@...nel.org>
Reviewed-by: Théo Lebrun <theo.lebrun@...tlin.com>
Signed-off-by: Santhosh Kumar K <s-k6@...com>
---
drivers/spi/spi-cadence-quadspi.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index 447a32a08a93..6627a3059ea3 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1722,12 +1722,10 @@ static const struct spi_controller_mem_caps cqspi_mem_caps = {
static int cqspi_setup_flash(struct cqspi_st *cqspi)
{
- unsigned int max_cs = cqspi->num_chipselect - 1;
struct platform_device *pdev = cqspi->pdev;
struct device *dev = &pdev->dev;
struct cqspi_flash_pdata *f_pdata;
- unsigned int cs;
- int ret;
+ int ret, cs, max_cs = -1;
/* Get flash device data */
for_each_available_child_of_node_scoped(dev->of_node, np) {
@@ -1740,10 +1738,10 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi)
if (cs >= cqspi->num_chipselect) {
dev_err(dev, "Chip select %d out of range.\n", cs);
return -EINVAL;
- } else if (cs < max_cs) {
- max_cs = cs;
}
+ max_cs = max_t(int, cs, max_cs);
+
f_pdata = &cqspi->f_pdata[cs];
f_pdata->cqspi = cqspi;
f_pdata->cs = cs;
@@ -1753,6 +1751,11 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi)
return ret;
}
+ if (max_cs < 0) {
+ dev_err(dev, "No flash device declared\n");
+ return -ENODEV;
+ }
+
cqspi->num_chipselect = max_cs + 1;
return 0;
}
--
2.34.1
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