AMS Sansa: Add delay for µSD writes to fix CRC failures with class 6 µSD cards.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22825 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 8 insertions, 0 deletions

diff --git a/firmware/target/arm/as3525/ata_sd_as3525.c b/firmware/target/arm/as3525/ata_sd_as3525.c
index 995bf932ca..fc5e2f880f 100644
--- a/firmware/target/arm/as3525/ata_sd_as3525.c
+++ b/firmware/target/arm/as3525/ata_sd_as3525.c
@@ -735,6 +735,14 @@ static int sd_transfer_sectors(IF_MD2(int drive,) unsigned long start,
 
 
         wakeup_wait(&transfer_completion_signal, TIMEOUT_BLOCK);
+
+        /* Higher speed class cards need a write delay here for some reason */
+        if((drive == SD_SLOT_AS3525) && write)
+        {
+            int delay = 3500;
+            while(delay--)  asm volatile ("nop\n");
+        }
+
         if(!transfer_error[drive])
         {
             if(!write)