Silex SX-SDMAC SDIO on iMX6 platform issues with mmc interrupt timeouts about linux-ath HOT 1 CLOSED

Author: Primoz Fiser <[email protected]>
Date:   Tue Aug 27 17:26:17 2019 +0200

    Disable caldata prefetch for SDIO bus
    
    - when enabled on iMX6 platform we get:
    
            mmc0: Timeout waiting for hardware interrupt.
    
      if we try to disable wireless interface with:
    
            ifconfig wlan0 down
    
      Afterwards, the wireless interface & SDIO bus are
      left unresponsive and cannot be easily brought back
      to operation.

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index 6942cd2..81f738a 100644
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -1255,6 +1255,9 @@ static int ath10k_debug_cal_data_fetch(struct ath10k *ar)
        if (ar->hw_params.cal_data_len == 0)
                return -EOPNOTSUPP;
 
+       if (ar->hif.bus == ATH10K_BUS_SDIO)
+               return -EINVAL;
+
        hi_addr = host_interest_item_address(HI_ITEM(hi_board_data));
 
        ret = ath10k_hif_diag_read(ar, hi_addr, &addr, sizeof(addr));