The CSD::CSR_IMP bit defines whether the Driver Stage
Register (DSR) is implemented or not. We do not set
this bit in CSD:

    static void sd_set_csd(SDState *sd, uint64_t size)
    {
        ...
        if (size <= SDSC_MAX_CAPACITY) { /* Standard Capacity SD */
            ...
            sd->csd[6] = 0xe0 |     /* Partial block for read allowed */
                ((csize >> 10) & 0x03);
            ...
        } else {                    /* SDHC */
            ...
            sd->csd[6] = 0x00;
            ...
        }
        ...
    }

The sd_normal_command() switch case for the SEND_DSR
command do nothing and fallback to "illegal command".
Since the command is mandatory (although the register
isn't...) call the sd_cmd_unimplemented() handler.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/sd/sd.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index a816493d37..097cb0f2e2 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -240,7 +240,7 @@ static const char *sd_response_name(sd_rsp_type_t rsp)
 static const char *sd_cmd_name(SDState *sd, uint8_t cmd)
 {
     static const char *cmd_abbrev[SDMMC_CMD_MAX] = {
-         [4]    = "SET_DSR",                 [5]    = "IO_SEND_OP_COND",
+                                             [5]    = "IO_SEND_OP_COND",
          [6]    = "SWITCH_FUNC",             [7]    = "SELECT/DESELECT_CARD",
          [8]    = "SEND_IF_COND",            [9]    = "SEND_CSD",
         [10]    = "SEND_CID",               [11]    = "VOLTAGE_SWITCH",
@@ -1153,7 +1153,6 @@ static sd_rsp_type_t sd_cmd_illegal(SDState *sd, SDRequest req)
 }
 
 /* Commands that are recognised but not yet implemented. */
-__attribute__((unused))
 static sd_rsp_type_t sd_cmd_unimplemented(SDState *sd, SDRequest req)
 {
     qemu_log_mask(LOG_UNIMP, "%s: CMD%i not implemented\n",
@@ -1312,16 +1311,6 @@ static sd_rsp_type_t sd_normal_command(SDState *sd, SDRequest req)
 
     switch (req.cmd) {
     /* Basic commands (Class 0 and Class 1) */
-    case 4:  /* CMD4:   SEND_DSR */
-        switch (sd->state) {
-        case sd_standby_state:
-            break;
-
-        default:
-            break;
-        }
-        break;
-
     case 6:  /* CMD6:   SWITCH_FUNCTION */
         if (sd->mode != sd_data_transfer_mode) {
             return sd_invalid_mode_for_cmd(sd, req);
@@ -2289,6 +2278,7 @@ static const SDProto sd_proto_sd = {
         [0]  = {0,  sd_bc,   "GO_IDLE_STATE", sd_cmd_GO_IDLE_STATE},
         [2]  = {0,  sd_bcr,  "ALL_SEND_CID", sd_cmd_ALL_SEND_CID},
         [3]  = {0,  sd_bcr,  "SEND_RELATIVE_ADDR", sd_cmd_SEND_RELATIVE_ADDR},
+        [4]  = {0,  sd_bc,   "SEND_DSR", sd_cmd_unimplemented},
         [19] = {2,  sd_adtc, "SEND_TUNING_BLOCK", sd_cmd_SEND_TUNING_BLOCK},
         [23] = {2,  sd_ac,   "SET_BLOCK_COUNT", sd_cmd_SET_BLOCK_COUNT},
     },
-- 
2.41.0