[MMC] Cleanup 385e3227d4d83ab13d7767c4bb3593b0256bf246

Rather than having two places which independently calculate the
timeout for data transfers, make it a library function instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Pierre Ossman <drzeus@drzeus.cx>

3 files changed, 53 insertions, 48 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index c0c7ef2a8b28..74eaaee66de0 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -247,6 +247,55 @@ int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
 
 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
 
+/**
+ *      mmc_set_data_timeout - set the timeout for a data command
+ *      @data: data phase for command
+ *      @card: the MMC card associated with the data transfer
+ *      @write: flag to differentiate reads from writes
+ */
+void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
+                          int write)
+{
+        unsigned int mult;
+
+        /*
+         * SD cards use a 100 multiplier rather than 10
+         */
+        mult = mmc_card_sd(card) ? 100 : 10;
+
+        /*
+         * Scale up the multiplier (and therefore the timeout) by
+         * the r2w factor for writes.
+         */
+        if (write)
+                mult <<= card->csd.r2w_factor;
+
+        data->timeout_ns = card->csd.tacc_ns * mult;
+        data->timeout_clks = card->csd.tacc_clks * mult;
+
+        /*
+         * SD cards also have an upper limit on the timeout.
+         */
+        if (mmc_card_sd(card)) {
+                unsigned int timeout_us, limit_us;
+
+                timeout_us = data->timeout_ns / 1000;
+                timeout_us += data->timeout_clks * 1000 /
+                        (card->host->ios.clock / 1000);
+
+                if (write)
+                        limit_us = 250000;
+                else
+                        limit_us = 100000;
+
+                if (timeout_us > limit_us) {
+                        data->timeout_ns = limit_us * 1000;
+                        data->timeout_clks = 0;
+                }
+        }
+}
+EXPORT_SYMBOL(mmc_set_data_timeout);
+
 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
 
 /**
@@ -908,12 +957,9 @@ static void mmc_read_scrs(struct mmc_host *host)
 {
         int err;
         struct mmc_card *card;
-
         struct mmc_request mrq;
         struct mmc_command cmd;
         struct mmc_data data;
-        unsigned int timeout_us;
-
         struct scatterlist sg;
 
         list_for_each_entry(card, &host->cards, node) {
@@ -948,17 +994,7 @@ static void mmc_read_scrs(struct mmc_host *host)
 
                 memset(&data, 0, sizeof(struct mmc_data));
 
-                data.timeout_ns = card->csd.tacc_ns * 100;
-                data.timeout_clks = card->csd.tacc_clks * 100;
-
-                timeout_us = data.timeout_ns / 1000;
-                timeout_us += data.timeout_clks * 1000 /
-                        (host->ios.clock / 1000);
-
-                if (timeout_us > 100000) {
-                        data.timeout_ns = 100000000;
-                        data.timeout_clks = 0;
-                }
+                mmc_set_data_timeout(&data, card, 0);
 
                 data.blksz_bits = 3;
                 data.blksz = 1 << 3;
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 515fb227eba7..d6fcc467b503 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -179,40 +179,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
                 brq.stop.arg = 0;
                 brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
 
-                brq.data.timeout_ns = card->csd.tacc_ns * 10;
-                brq.data.timeout_clks = card->csd.tacc_clks * 10;
-
-                /*
-                 * Scale up the timeout by the r2w factor
-                 */
-                if (rq_data_dir(req) == WRITE) {
-                        brq.data.timeout_ns <<= card->csd.r2w_factor;
-                        brq.data.timeout_clks <<= card->csd.r2w_factor;
-                }
-
-                /*
-                 * SD cards use a 100 multiplier and has a upper limit
-                 */
-                if (mmc_card_sd(card)) {
-                        unsigned int limit_us, timeout_us;
-
-                        brq.data.timeout_ns *= 10;
-                        brq.data.timeout_clks *= 10;
-
-                        if (rq_data_dir(req) == READ)
-                                limit_us = 100000;
-                        else
-                                limit_us = 250000;
-
-                        timeout_us = brq.data.timeout_ns / 1000;
-                        timeout_us += brq.data.timeout_clks * 1000 /
-                                (card->host->ios.clock / 1000);
-
-                        if (timeout_us > limit_us) {
-                                brq.data.timeout_ns = limit_us * 1000;
-                                brq.data.timeout_clks = 0;
-                        }
-                }
+                mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
 
                 if (rq_data_dir(req) == READ) {
                         brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 03a14a30c46a..627e2c08ce41 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -105,6 +105,8 @@ extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
 extern int mmc_wait_for_app_cmd(struct mmc_host *, unsigned int,
         struct mmc_command *, int);
 
+extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *, int);
+
 extern int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card);
 
 static inline void mmc_claim_host(struct mmc_host *host)