Signed-off-by: Juergen Borleis <jbe@xxxxxxxxxxxxxx>
---
drivers/mci/mci-core.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index a58dedc1cd..d93be6d33f 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -361,9 +361,9 @@ static int mmc_send_op_cond(struct mci *mci)
}
/**
- * FIXME
- * @param mci MCI instance
- * @param ext_csd Buffer for a 512 byte sized extended CSD
+ * Read-in the card's whole extended CSD configuration area
+ * @param[in] mci MCI instance
+ * @param[out] ext_csd Buffer for an #EXT_CSD_BLOCKSIZE byte sized extended CSD
* @return Transaction status (0 on success)
*
* Note: Only cards newer than Version 1.1 (Physical Layer Spec) support
@@ -379,19 +379,23 @@ int mci_send_ext_csd(struct mci *mci, char *ext_csd)
data.dest = ext_csd;
data.blocks = 1;
- data.blocksize = 512;
+ data.blocksize = EXT_CSD_BLOCKSIZE;
data.flags = MMC_DATA_READ;
return mci_send_cmd(mci, &cmd, &data);
}
/**
- * FIXME
- * @param mci MCI instance
- * @param set FIXME
- * @param index FIXME
- * @param value FIXME
+ * Write a byte into the card's extended CSD configuration area
+ * @param[in] mci MCI instance
+ * @param[in] index Byte index in the extended CSD configuration area
+ * @param[in] value Byte to write at index into the extended CSD configuration area
* @return Transaction status (0 on success)
+ *
+ * This sends a CMD6 (aka SWITCH) to the card and writes @b value at extended CSD @b index.
+ *
+ * @note It always writes a full byte, the alternatives 'bit set' and
+ * 'bit clear' aren't supported.
*/
int mci_switch(struct mci *mci, unsigned index, unsigned value)
{
--
2.20.1
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