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| author |   Koji Matsuoka <koji.matsuoka.xm@renesas.com> | 2015-06-15 02:25:05 +0900 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2015-08-31 14:42:40 +0100 |
| commit | fe78d0b7691c02744004b15f6979b3f106464bc4 (patch) | |
| tree | 08a33d5fd47836f31dd65364d0e4e9509d2d2c73 /drivers/spi | |
| parent | spi: sh-msiof: Remove obsolete spi_r8a779x_msiof platform_device_id entries (diff) | |
| download | linux-dev-fe78d0b7691c02744004b15f6979b3f106464bc4.tar.xz linux-dev-fe78d0b7691c02744004b15f6979b3f106464bc4.zip | |
spi: sh-msiof: Fix FIFO size to 64 word from 256 word
The upper limit of Tx/Rx FIFO size is 64 word by the
specification of H/W. This patch corrects to 64 word from 256 word.
Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-sh-msiof.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index 118c652d88b5..a7934ab00b96 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -48,8 +48,8 @@ struct sh_msiof_spi_priv { const struct sh_msiof_chipdata *chipdata; struct sh_msiof_spi_info *info; struct completion done; - int tx_fifo_size; - int rx_fifo_size; + unsigned int tx_fifo_size; + unsigned int rx_fifo_size; void *tx_dma_page; void *rx_dma_page; dma_addr_t tx_dma_addr; @@ -95,8 +95,6 @@ struct sh_msiof_spi_priv { #define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */ #define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */ -#define MAX_WDLEN 256U - /* TSCR and RSCR */ #define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */ #define SCR_BRPS(i) (((i) - 1) << 8) @@ -850,7 +848,12 @@ static int sh_msiof_transfer_one(struct spi_master *master, * DMA supports 32-bit words only, hence pack 8-bit and 16-bit * words, with byte resp. word swapping. */ - unsigned int l = min(len, MAX_WDLEN * 4); + unsigned int l = 0; + + if (tx_buf) + l = min(len, p->tx_fifo_size * 4); + if (rx_buf) + l = min(len, p->rx_fifo_size * 4); if (bits <= 8) { if (l & 3) @@ -963,7 +966,7 @@ static const struct sh_msiof_chipdata sh_data = { static const struct sh_msiof_chipdata r8a779x_data = { .tx_fifo_size = 64, - .rx_fifo_size = 256, + .rx_fifo_size = 64, .master_flags = SPI_MASTER_MUST_TX, }; |