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

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 118c652..a7934ab 100644 (file)
--- 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,
 };