mmc: core: Simplify card drive strength mask

Card drive strength selection uses a callback to
which a mask of supported drive strengths is passed.
Currently, the bits are checked against the values
in the SD specifications. That is not necessary
because the callback will anyway match the mask
against a valid value. Simplify by taking the mask
as is but still ensuring that the default mandatory
value (type B) is always supported.

Signed-off-by: Adrian Hunter <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/core/sd.c

···
 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
 {
 	int host_drv_type = SD_DRIVER_TYPE_B;
-	int card_drv_type = SD_DRIVER_TYPE_B;
-	int drive_strength, drv_type;
+	int card_drv_type, drive_strength, drv_type;
 	int err;
 
 	if (!card->host->ops->select_drive_strength)
···
 	if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
 		host_drv_type |= SD_DRIVER_TYPE_D;
 
-	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
-		card_drv_type |= SD_DRIVER_TYPE_A;
-
-	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
-		card_drv_type |= SD_DRIVER_TYPE_C;
-
-	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
-		card_drv_type |= SD_DRIVER_TYPE_D;
+	card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 
 	/*
 	 * The drive strength that the hardware can support

drivers/mmc/core/sdio.c

···
 static void sdio_select_driver_type(struct mmc_card *card)
 {
 	int host_drv_type = SD_DRIVER_TYPE_B;
-	int card_drv_type = SD_DRIVER_TYPE_B;
-	int drive_strength, drv_type;
+	int card_drv_type, drive_strength, drv_type;
 	unsigned char card_strength;
 	int err;
 
···
 	if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
 		host_drv_type |= SD_DRIVER_TYPE_D;
 
-	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
-		card_drv_type |= SD_DRIVER_TYPE_A;
-
-	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
-		card_drv_type |= SD_DRIVER_TYPE_C;
-
-	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
-		card_drv_type |= SD_DRIVER_TYPE_D;
+	card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 
 	/*
 	 * The drive strength that the hardware can support