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AMS Sansa: If SD card is HS capable set High Speed timings.

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This still doesn't solve the problem of the cards being overclocked at 62MHz but we can mitigate this a bit by switching to HS timings.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23088 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2009-10-11 03:11:13 +00:00
parent 178337970e
commit 14079c39f0
1 changed files with 11 additions and 1 deletions
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12
firmware/target/arm/as3525/ata_sd_as3525.c
View file

@ -94,6 +94,7 @@ static const int pl180_base[NUM_DRIVES] = {
#endif
};
static int sd_wait_for_state(const int drive, unsigned int state);
static int sd_select_bank(signed char bank);
static int sd_init_card(const int drive);
static void init_pl180_controller(const int drive);
@ -321,6 +322,15 @@ static int sd_init_card(const int drive)
MCI_CLOCK(drive) |= MCI_CLOCK_BYPASS; /* full speed for controller clock */
mci_delay();
/* If card is HS capable switch to HS timings */
if(card_info[drive].speed > 125000)
{
if(sd_wait_for_state(drive, SD_TRAN))
return -13;
if(!send_cmd(drive, SD_SWITCH_FUNC, 0x80fffff1, MCI_ARG, NULL))
return -14;
}
/*
* enable bank switching
* without issuing this command, we only have access to 1/4 of the blocks
@ -331,7 +341,7 @@ static int sd_init_card(const int drive)
{
const int ret = sd_select_bank(-1);
if(ret < 0)
return ret - 13;
return ret - 15;
}
return 0;