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Some MMCs don't like reading their very last sector with the read_multiple_blocks command, so always read it with read_single_block. Slight optimisation.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5942 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2005-02-14 23:42:32 +00:00
parent 672092c6dc
commit 4d6e482e56
1 changed files with 21 additions and 16 deletions
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35
firmware/drivers/ata_mmc.c
View file

@ -626,7 +626,7 @@ int ata_read_sectors(IF_MV2(int drive,)
void* inbuf)
{
int ret = 0;
int i;
int last_sector;
unsigned long addr;
unsigned char response;
void *inbuf_prev = NULL;
@ -645,22 +645,17 @@ int ata_read_sectors(IF_MV2(int drive,)
if (start + incount > card->numsectors)
panicf("Reading past end of card\n");
/* some cards don't like reading the very last sector with
* CMD_READ_MULTIPLE_BLOCK, so make sure this sector is always
* read with CMD_READ_SINGLE_BLOCK. */
last_sector = (start + incount == card->numsectors) ? 1 : 0;
if (ret == 0)
{
if (incount == 1)
{
ret = send_cmd(CMD_READ_SINGLE_BLOCK, addr, &response);
if (ret == 0)
{
ret = receive_sector(inbuf, inbuf_prev, card->read_timeout);
inbuf_prev = inbuf;
last_disk_activity = current_tick;
}
}
else
if (incount > 1)
{
ret = send_cmd(CMD_READ_MULTIPLE_BLOCK, addr, &response);
for (i = 0; (i < incount) && (ret == 0); i++)
for (; (incount > last_sector) && (ret == 0); incount--)
{
ret = receive_sector(inbuf, inbuf_prev, card->read_timeout);
inbuf_prev = inbuf;
@ -670,6 +665,17 @@ int ata_read_sectors(IF_MV2(int drive,)
if (ret == 0)
ret = send_cmd(CMD_STOP_TRANSMISSION, 0, &response);
}
if (incount && (ret == 0))
{
ret = send_cmd(CMD_READ_SINGLE_BLOCK, addr, &response);
if (ret == 0)
{
ret = receive_sector(inbuf, inbuf_prev, card->read_timeout);
inbuf_prev = inbuf;
last_disk_activity = current_tick;
}
}
if (ret == 0)
bitswap(inbuf_prev, SECTOR_SIZE);
}
@ -690,7 +696,6 @@ int ata_write_sectors(IF_MV2(int drive,)
const void* buf)
{
int ret = 0;
int i;
unsigned long addr;
unsigned char response;
tCardInfo *card;
@ -724,7 +729,7 @@ int ata_write_sectors(IF_MV2(int drive,)
{
swapcopy_sector(buf); /* prepare first sector */
ret = send_cmd(CMD_WRITE_MULTIPLE_BLOCK, addr, &response);
for (i = 1; (i < count) && (ret == 0); i++)
for (; (count > 1) && (ret == 0); count--)
{
buf += SECTOR_SIZE;
ret = send_sector(buf, card->write_timeout);