diff options
| author | Ajay Singh <ajay.kathat@microchip.com> | 2021-09-16 16:49:20 +0000 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2021-09-21 18:08:16 +0300 |
| commit | c2dcb4766bcb1e3622d7579ee9d57f28dc2c2f2e (patch) | |
| tree | 18ce6daefbc5af56d5cd8b309fbe37cc1429798d /drivers/net/wireless/microchip/wilc1000/spi.c | |
| parent | 1bcc0879c963770c90bc07d9aa5d0d50dda925f3 (diff) | |
wilc1000: handle read failure issue for clockless registers
For SPI bus, the register read fails after read/write to the clockless
register during chip wakeup sequence. Add workaround to send CMD_RESET
command during chip wake-up sequence to overcome the issue.
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210916164902.74629-7-ajay.kathat@microchip.com
Diffstat (limited to 'drivers/net/wireless/microchip/wilc1000/spi.c')
| -rw-r--r-- | drivers/net/wireless/microchip/wilc1000/spi.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c index 602316f4367c..511b9264185f 100644 --- a/drivers/net/wireless/microchip/wilc1000/spi.c +++ b/drivers/net/wireless/microchip/wilc1000/spi.c @@ -47,6 +47,8 @@ struct wilc_spi { static const struct wilc_hif_func wilc_hif_spi; +static int wilc_spi_reset(struct wilc *wilc); + /******************************************** * * Spi protocol Function @@ -956,6 +958,19 @@ static int wilc_spi_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size) * ********************************************/ +static int wilc_spi_reset(struct wilc *wilc) +{ + struct spi_device *spi = to_spi_device(wilc->dev); + struct wilc_spi *spi_priv = wilc->bus_data; + int result; + + result = wilc_spi_special_cmd(wilc, CMD_RESET); + if (result && !spi_priv->probing_crc) + dev_err(&spi->dev, "Failed cmd reset\n"); + + return result; +} + static int wilc_spi_deinit(struct wilc *wilc) { /* @@ -1173,4 +1188,5 @@ static const struct wilc_hif_func wilc_hif_spi = { .hif_block_tx_ext = wilc_spi_write, .hif_block_rx_ext = wilc_spi_read, .hif_sync_ext = wilc_spi_sync_ext, + .hif_reset = wilc_spi_reset, }; |