diff options
| author | Ludovic Barre <ludovic.barre@st.com> | 2017-10-26 17:12:34 +0200 |
|---|---|---|
| committer | Cyrille Pitchen <cyrille.pitchen@wedev4u.fr> | 2017-10-29 18:54:22 +0100 |
| commit | 10cd4b7b7432d529d7f8b73979a846e33a573a9e (patch) | |
| tree | 4827aa1a6ffef13bcf6ba4f146f9c4831eab03dc /drivers/mtd/spi-nor | |
| parent | e812963b918656d875beb47c277fd0e29bd826af (diff) | |
| download | linux-10cd4b7b7432d529d7f8b73979a846e33a573a9e.tar.bz2 | |
mtd: spi-nor: stm32-quadspi: fix prefetching outside fsize
When memory-mapped mode is used, a prefetching mechanism fully
managed by the hardware allows to optimize the read from external
the QSPI memory. A 32-bytes FIFO is used for prefetching.
When the limit of flash size - fifo size is reached the prefetching
mechanism tries to read outside the fsize.
The stm32 quadspi hardware become busy and should be aborted.
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Reported-by: Bruno Herrera <bruherrera@gmail.com>
Tested-by: Bruno Herrera <bruherrera@gmail.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
Diffstat (limited to 'drivers/mtd/spi-nor')
| -rw-r--r-- | drivers/mtd/spi-nor/stm32-quadspi.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mtd/spi-nor/stm32-quadspi.c b/drivers/mtd/spi-nor/stm32-quadspi.c index 56b75fc226c3..b3c7f6addba7 100644 --- a/drivers/mtd/spi-nor/stm32-quadspi.c +++ b/drivers/mtd/spi-nor/stm32-quadspi.c @@ -126,6 +126,7 @@ #define STM32_MAX_MMAP_SZ SZ_256M #define STM32_MAX_NORCHIP 2 +#define STM32_QSPI_FIFO_SZ 32 #define STM32_QSPI_FIFO_TIMEOUT_US 30000 #define STM32_QSPI_BUSY_TIMEOUT_US 100000 @@ -137,6 +138,7 @@ struct stm32_qspi_flash { u32 presc; u32 read_mode; bool registered; + u32 prefetch_limit; }; struct stm32_qspi { @@ -285,6 +287,7 @@ static int stm32_qspi_send(struct stm32_qspi_flash *flash, { struct stm32_qspi *qspi = flash->qspi; u32 ccr, dcr, cr; + u32 last_byte; int err; err = stm32_qspi_wait_nobusy(qspi); @@ -327,6 +330,10 @@ static int stm32_qspi_send(struct stm32_qspi_flash *flash, if (err) goto abort; writel_relaxed(FCR_CTCF, qspi->io_base + QUADSPI_FCR); + } else { + last_byte = cmd->addr + cmd->len; + if (last_byte > flash->prefetch_limit) + goto abort; } return err; @@ -335,7 +342,9 @@ abort: cr = readl_relaxed(qspi->io_base + QUADSPI_CR) | CR_ABORT; writel_relaxed(cr, qspi->io_base + QUADSPI_CR); - dev_err(qspi->dev, "%s abort err:%d\n", __func__, err); + if (err) + dev_err(qspi->dev, "%s abort err:%d\n", __func__, err); + return err; } @@ -563,6 +572,7 @@ static int stm32_qspi_flash_setup(struct stm32_qspi *qspi, } flash->fsize = FSIZE_VAL(mtd->size); + flash->prefetch_limit = mtd->size - STM32_QSPI_FIFO_SZ; flash->read_mode = CCR_FMODE_MM; if (mtd->size > qspi->mm_size) |