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Subject[PATCH 1/2] spi: spi-mem: stm32-qspi: avoid memory corruption at low frequency
Date
From: Ludovic Barre <ludovic.barre@st.com>

This patch solves a memory corruption seen at 8 MHz.
To avoid such issue, timeout counter is disabled.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
---
drivers/spi/spi-stm32-qspi.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
index 3b2a9a6..7354f9d 100644
--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -76,7 +76,6 @@
#define QSPI_PSMAR 0x28
#define QSPI_PIR 0x2c
#define QSPI_LPTR 0x30
-#define LPTR_DFT_TIMEOUT 0x10

#define STM32_QSPI_MAX_MMAP_SZ SZ_256M
#define STM32_QSPI_MAX_NORCHIP 2
@@ -372,8 +371,7 @@ static int stm32_qspi_setup(struct spi_device *spi)
flash->presc = presc;

mutex_lock(&qspi->lock);
- writel_relaxed(LPTR_DFT_TIMEOUT, qspi->io_base + QSPI_LPTR);
- cr = FIELD_PREP(CR_FTHRES_MASK, 3) | CR_TCEN | CR_SSHIFT | CR_EN;
+ cr = FIELD_PREP(CR_FTHRES_MASK, 3) | CR_SSHIFT | CR_EN;
writel_relaxed(cr, qspi->io_base + QSPI_CR);

/* set dcr fsize to max address */
--
2.7.4
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