mmc_spi: generate response for send status command

A "send status" command is added with the commit "mmc: checking
status after commands with R1b response". But the status register
returned from send status command of SPI protocol is different from
that of MMC/SD protocol. We do a simple test and generate a response
in stead of full bit-by-bit translation.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

drivers/mmc/mmc_spi.c

@@ -208,6 +208,11 @@ static int mmc_spi_request(struct mmc *mmc, struct mmc_cmd *cmd,
 			cmd->response[0] = swab32(cmd->response[0]);
 			debug("r32 %x\n", cmd->response[0]);
 			break;
+		case MMC_CMD_SEND_STATUS:
+			spi_xfer(spi, 1 * 8, NULL, cmd->response, 0);
+			cmd->response[0] = (cmd->response[0] & 0xff) ?
+				MMC_STATUS_ERROR : MMC_STATUS_RDY_FOR_DATA;
+			break;
 		}
 	} else {
 		debug("%s:data %x %x %x\n", __func__,

include/mmc.h

@@ -102,6 +102,7 @@
 #define MMC_STATUS_MASK		(~0x0206BF7F)
 #define MMC_STATUS_RDY_FOR_DATA (1 << 8)
 #define MMC_STATUS_CURR_STATE	(0xf << 9)
+#define MMC_STATUS_ERROR	(1 << 19)
 
 #define MMC_VDD_165_195		0x00000080	/* VDD voltage 1.65 - 1.95 */
 #define MMC_VDD_20_21		0x00000100	/* VDD voltage 2.0 ~ 2.1 */