mmc: core: Allow setting CMD timeout for CMD6 (SWITCH).

CMD6 is an R1B-type command, where DAT is used as busy. Depending
on register written using CMD6, timeout value can be different
as per spec.

Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index ae6b8fd..396cb23 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -548,7 +548,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
         */
        if (card->ext_csd.enhanced_area_en) {
                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-                               EXT_CSD_ERASE_GROUP_DEF, 1);
+                                EXT_CSD_ERASE_GROUP_DEF, 1, 0);
 
                if (err && err != -EBADMSG)
                        goto free_card;
@@ -579,7 +579,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
        if (card->ext_csd.bootconfig & 0x7) {
                card->ext_csd.bootconfig &= ~0x7;
                mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_CONFIG,
-                          card->ext_csd.bootconfig);
+                          card->ext_csd.bootconfig, 0);
        }
 
        /*
@@ -588,7 +588,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
        if ((card->ext_csd.hs_max_dtr != 0) &&
                (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-                       EXT_CSD_HS_TIMING, 1);
+                                EXT_CSD_HS_TIMING, 1, 0);
                if (err && err != -EBADMSG)
                        goto free_card;
 
@@ -655,7 +655,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
                                ddr = 0; /* no DDR for 1-bit width */
                        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                                         EXT_CSD_BUS_WIDTH,
-                                        ext_csd_bits[idx][0]);
+                                        ext_csd_bits[idx][0],
+                                        0);
                        if (!err) {
                                mmc_set_bus_width_ddr(card->host,
                                                      bus_width, MMC_SDR_MODE);
@@ -674,8 +675,9 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 
                if (!err && ddr) {
                        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-                                       EXT_CSD_BUS_WIDTH,
-                                       ext_csd_bits[idx][1]);
+                                        EXT_CSD_BUS_WIDTH,
+                                        ext_csd_bits[idx][1],
+                                        0);
                }
                if (err) {
                        printk(KERN_WARNING "%s: switch to bus width %d ddr %d "

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index f3b22bf..a2bae62 100644 (file)
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -387,7 +387,19 @@ int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
        return err;
 }
 
-int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
+/**
+ *     mmc_switch - modify EXT_CSD register
+ *     @card: the MMC card associated with the data transfer
+ *     @set: cmd set values
+ *     @index: EXT_CSD register index
+ *     @value: value to program into EXT_CSD register
+ *     @timeout_ms: timeout (ms) for operation performed by register write,
+ *                   timeout of zero implies maximum possible timeout
+ *
+ *     Modifies the EXT_CSD register for selected card.
+ */
+int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
+              unsigned int timeout_ms)
 {
        int err;
        struct mmc_command cmd;
@@ -404,6 +416,7 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
                  (value << 8) |
                  set;
        cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
+       cmd.cmd_timeout_ms = timeout_ms;
 
        err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
        if (err)
@@ -433,6 +446,7 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
 
        return 0;
 }
+EXPORT_SYMBOL_GPL(mmc_switch);
 
 int mmc_send_status(struct mmc_card *card, u32 *status)
 {

diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index e6d44b8..9276946 100644 (file)
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -20,7 +20,6 @@ int mmc_all_send_cid(struct mmc_host *host, u32 *cid);
 int mmc_set_relative_addr(struct mmc_card *card);
 int mmc_send_csd(struct mmc_card *card, u32 *csd);
 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
-int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value);
 int mmc_send_status(struct mmc_card *card, u32 *status);
 int mmc_send_cid(struct mmc_host *host, u32 *cid);
 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 811e96e..f8e4bcb 100644 (file)
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -135,6 +135,7 @@ extern void mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
 extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
 extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
        struct mmc_command *, int);
+extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int);
 
 #define MMC_ERASE_ARG          0x00000000
 #define MMC_SECURE_ERASE_ARG   0x80000000