[PATCH] mtd onenand driver: reduce stack usage

[linux-2.6-omap-h63xx.git] / drivers / mmc / mmc.c

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index da528390acf87293292237abddf2bf5cf66b600c..eb41391e06e938a5a0607b90defab00f82fd9827 100644 (file)
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -679,7 +679,15 @@ static void mmc_idle_cards(struct mmc_host *host)
 }
 
 /*
- * Apply power to the MMC stack.
+ * Apply power to the MMC stack.  This is a two-stage process.
+ * First, we enable power to the card without the clock running.
+ * We then wait a bit for the power to stabilise.  Finally,
+ * enable the bus drivers and clock to the card.
+ *
+ * We must _NOT_ enable the clock prior to power stablising.
+ *
+ * If a host does all the power sequencing itself, ignore the
+ * initial MMC_POWER_UP stage.
  */
 static void mmc_power_up(struct mmc_host *host)
 {
@@ -816,7 +824,7 @@ static void mmc_discover_cards(struct mmc_host *host)
 
                        cmd.opcode = SD_SEND_RELATIVE_ADDR;
                        cmd.arg = 0;
-                       cmd.flags = MMC_RSP_R1;
+                       cmd.flags = MMC_RSP_R6;
 
                        err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
                        if (err != MMC_ERR_NONE)
@@ -932,8 +940,9 @@ static void mmc_read_scrs(struct mmc_host *host)
 
                sg_init_one(&sg, (u8*)card->raw_scr, 8);
 
-               err = mmc_wait_for_req(host, &mrq);
-               if (err != MMC_ERR_NONE) {
+               mmc_wait_for_req(host, &mrq);
+
+               if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
                        mmc_card_set_dead(card);
                        continue;
                }