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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
This commit is contained in:
Koji Matsuoka 2015-06-15 02:25:05 +09:00 committed by Mark Brown
parent f6d1b3e20a
commit fe78d0b769
1 changed files with 9 additions and 6 deletions
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15
drivers/spi/spi-sh-msiof.c
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@ -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,
};