mmc: core: Introduce MMC_CAP2_NO_SDIO cap

This patch introduce a new MMC_CAP2_NO_SDIO cap used to tell the mmc
core to not send SDIO specific commands.

Signed-off-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 07b2f086213f..910aa254f23a 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2476,15 +2476,20 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
          * sdio_reset sends CMD52 to reset card.  Since we do not know
          * if the card is being re-initialized, just send it.  CMD52
          * should be ignored by SD/eMMC cards.
+         * Skip it if we already know that we do not support SDIO commands
          */
-        sdio_reset(host);
+        if (!(host->caps2 & MMC_CAP2_NO_SDIO))
+                sdio_reset(host);
+
         mmc_go_idle(host);
 
         mmc_send_if_cond(host, host->ocr_avail);
 
         /* Order's important: probe SDIO, then SD, then MMC */
-        if (!mmc_attach_sdio(host))
-                return 0;
+        if (!(host->caps2 & MMC_CAP2_NO_SDIO))
+                if (!mmc_attach_sdio(host))
+                        return 0;
+
         if (!mmc_attach_sd(host))
                 return 0;
         if (!mmc_attach_mmc(host))