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sd-as3525v2: Add delay after SD_SWITCH_FUNC to while switching to high speed timings and wait until after this switch to bring the card clock back up to full speed.

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This seems to make switching the uSD card to high speed timing much more reliable.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25935 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2010-05-10 17:34:54 +00:00
parent fb6723afe4
commit 56457934c6
1 changed files with 4 additions and 3 deletions
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7
firmware/target/arm/as3525/sd-as3525v2.c
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@ -507,9 +507,6 @@ static int sd_init_card(const int drive)
#endif
/* End of Card Identification Mode ************************************/
/* Card back to full speed */
MCI_CLKDIV &= ~(0xFF); /* CLK_DIV_0 : bits 7:0 = 0x00 */
/* Attempt to switch cards to HS timings, non HS cards just ignore this */
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_NO_RESP, NULL))
@ -521,6 +518,7 @@ static int sd_init_card(const int drive)
/* CMD6 */
if(!send_cmd(drive, SD_SWITCH_FUNC, 0x80fffff1, MCI_NO_RESP, NULL))
return -9;
mci_delay();
/* We need to go back to STBY state now so we can read csd */
/* CMD7 w/rca=0: Deselect card to put it in STBY state */
@ -534,6 +532,9 @@ static int sd_init_card(const int drive)
sd_parse_csd(&card_info[drive]);
/* Card back to full speed */
MCI_CLKDIV &= ~(0xFF); /* CLK_DIV_0 : bits 7:0 = 0x00 */
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_NO_RESP, NULL))
return -12;