sdcard: handle CMD54 (SDIO)

Linux uses it to poll the bus before polling for a card.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Message-id: 20180215221325.7611-10-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index cc5caaf4f01e99fb629c47e3c450c63e7f2368ad..63da05eaefb2d176b05855f0c4178ec8ddfe4fc4 100644 (file)
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -1371,9 +1371,8 @@ static sd_rsp_type_t sd_normal_command(SDState *sd,
         }
         break;
 
-    case 52:
-    case 53:
-        /* CMD52, CMD53: reserved for SDIO cards
+    case 52 ... 54:
+        /* CMD52, CMD53, CMD54: reserved for SDIO cards
          * (see the SDIO Simplified Specification V2.0)
          * Handle as illegal command but do not complain
          * on stderr, as some OSes may use these in their