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path: root/drivers/net/wireless/microchip/wilc1000/spi.c
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Diffstat (limited to 'drivers/net/wireless/microchip/wilc1000/spi.c')
-rw-r--r--drivers/net/wireless/microchip/wilc1000/spi.c23
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)