diff options
Diffstat (limited to 'drivers/net/wireless/microchip/wilc1000/spi.c')
| -rw-r--r-- | drivers/net/wireless/microchip/wilc1000/spi.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c index a18dac0aa6b6..be732929322c 100644 --- a/drivers/net/wireless/microchip/wilc1000/spi.c +++ b/drivers/net/wireless/microchip/wilc1000/spi.c @@ -35,6 +35,7 @@ static const struct wilc_hif_func wilc_hif_spi; #define CMD_SINGLE_READ 0xca #define CMD_RESET 0xcf +#define SPI_ENABLE_VMM_RETRY_LIMIT 2 #define DATA_PKT_SZ_256 256 #define DATA_PKT_SZ_512 512 #define DATA_PKT_SZ_1K 1024 @@ -856,8 +857,26 @@ static int wilc_spi_read_int(struct wilc *wilc, u32 *int_status) static int wilc_spi_clear_int_ext(struct wilc *wilc, u32 val) { - return spi_internal_write(wilc, WILC_SPI_INT_CLEAR - WILC_SPI_REG_BASE, - val); + int ret; + int retry = SPI_ENABLE_VMM_RETRY_LIMIT; + u32 check; + + while (retry) { + ret = spi_internal_write(wilc, + WILC_SPI_INT_CLEAR - WILC_SPI_REG_BASE, + val); + if (ret) + break; + + ret = spi_internal_read(wilc, + WILC_SPI_INT_CLEAR - WILC_SPI_REG_BASE, + &check); + if (ret || ((check & EN_VMM) == (val & EN_VMM))) + break; + + retry--; + } + return ret; } static int wilc_spi_sync_ext(struct wilc *wilc, int nint) |