Re: 2GB MMC/SD cards

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Sat, Jun 03, 2006 at 03:15:48PM +0100, Russell King wrote:
> I don't know what to do about this since I don't have any cards and
> I've not seen any bug reports to investigate what's going on.  So I'm
> just going to say "the code as it stands is correct as to my best
> knowledge, please provide details of it's failings."

It would be nice to get the results from the following patch from people
with failing cards.  Obviously they need to enable the debugging message
to see it.

diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -44,6 +44,7 @@
 #define MMC_SHIFT	3
 
 static int major;
+static int debug;
 
 /*
  * There is one mmc_blk_data per slot.
@@ -324,6 +325,19 @@ static struct mmc_blk_data *mmc_blk_allo
 	 */
 	md->read_only = mmc_blk_readonly(card);
 
+	if (debug)
+		printk(KERN_INFO "%s: sd%u mmca%u cap0x%x rd:b%u:m%u:p%u wr:b%u:m%u:p%u\n",
+			mmc_card_id(card),
+			mmc_card_sd(card),
+			card->csd.mmca_vsn,
+			card->csd.capacity,
+			card->csd.read_blkbits,
+			card->csd.read_misalign,
+			card->csd.read_partial,
+			card->csd.write_blkbits,
+			card->csd.write_misalign,
+			card->csd.write_partial);
+
 	/*
 	 * Figure out a workable block size.  MMC cards have:
 	 *  - two block sizes, one for read and one for write.
@@ -575,5 +589,8 @@ module_exit(mmc_blk_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "enable debugging messages");
+
 module_param(major, int, 0444);
 MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core