[Qemu-devel] [PATCH 3/4] hw/sd.c: Don't complain about SDIO commands CMD52/CMD53

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

From: Peter Maydell <peter.maydell@linaro.org>

The SDIO specification introduces new commands 52 and 53.
Handle as illegal command but do not complain on stderr,
as SDIO-aware OSes (including Linux) may legitimately use
these in their probing for presence of an SDIO card.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 hw/sd.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/hw/sd.c b/hw/sd.c
index f44a970..cedfb20 100644
--- a/hw/sd.c
+++ b/hw/sd.c
@@ -1104,6 +1104,17 @@ static sd_rsp_type_t sd_normal_command(SDState *sd,
         }
         break;
 
+    case 52:
+    case 53:
+        /* CMD52, CMD53: 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
+         * probing for presence of an SDIO card.
+         */
+        sd->card_status |= ILLEGAL_COMMAND;
+        return sd_r0;
+
     /* Application specific commands (Class 8) */
     case 55:	/* CMD55:  APP_CMD */
         if (sd->rca != rca)
-- 
1.7.4.4